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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2014-11-03 17:52:22 -0200
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2014-11-03 17:52:22 -0200
commite878e2e7f64c6634cfb340fffeec3930114476c3 (patch)
tree7a8c4babf471cf27f0f83f71e2352b6fc3e84bd7
parent771f2e0fdc5b548a874866df76451943041b2a47 (diff)
linux-libre-rt-3.14.23_gnu.rt20-1: updating version
-rw-r--r--kernels/linux-libre-rt/PKGBUILD28
-rw-r--r--kernels/linux-libre-rt/config.i6869
-rw-r--r--kernels/linux-libre-rt/config.mips64el3
-rw-r--r--kernels/linux-libre-rt/config.x86_649
-rw-r--r--kernels/linux-libre-rt/patch-3.14.17-rt9.patch23414
-rw-r--r--kernels/linux-libre-rt/revert_timers-dont_raise_softirq_unconditionally_and_fixes.patch130
6 files changed, 24 insertions, 23569 deletions
diff --git a/kernels/linux-libre-rt/PKGBUILD b/kernels/linux-libre-rt/PKGBUILD
index 71af5de9c..64fb82d43 100644
--- a/kernels/linux-libre-rt/PKGBUILD
+++ b/kernels/linux-libre-rt/PKGBUILD
@@ -12,17 +12,16 @@
pkgbase=linux-libre-rt # Build stock -rt kernel
_pkgbasever=3.14-gnu
-_pkgver=3.14.20-gnu
+_pkgver=3.14.23-gnu
_rtbasever=3.14
-_rtpatchver=rt9
+_rtpatchver=rt20
_replacesarchkernel=('linux%') # '%' gets replaced with _kernelname
_replacesoldkernels=('kernel26%' 'kernel26-libre%') # '%' gets replaced with _kernelname
_replacesoldmodules=() # '%' gets replaced with _kernelname
_srcname=linux-${_pkgbasever%-*}
-#_archpkgver=${_pkgver%-*}_${_rtpatchver}
-_archpkgver=3.14.12_${_rtpatchver}
+_archpkgver=${_pkgver%-*}_${_rtpatchver}
pkgver=${_pkgver//-/_}.${_rtpatchver}
pkgrel=1
arch=('i686' 'x86_64' 'mips64el')
@@ -32,8 +31,7 @@ makedepends=('xmlto' 'docbook-xsl' 'kmod' 'inetutils' 'bc')
options=('!strip')
source=("http://linux-libre.fsfla.org/pub/linux-libre/releases/${_pkgbasever}/linux-libre-${_pkgbasever}.tar.xz"
"http://linux-libre.fsfla.org/pub/linux-libre/releases/${_pkgver}/patch-${_pkgbasever}-${_pkgver}.xz"
- #"http://www.kernel.org/pub/linux/kernel/projects/rt/${_rtbasever}/patch-${_pkgver%-*}-${_rtpatchver}.patch.xz"
- "patch-${_pkgbasever%-*}.17-${_rtpatchver}.patch"
+ "http://www.kernel.org/pub/linux/kernel/projects/rt/${_rtbasever}/patch-${_pkgver%-*}-${_rtpatchver}.patch.xz"
# the main kernel config files
'config.i686' 'config.x86_64' 'config.mips64el'
# standard config files for mkinitcpio ramdisk
@@ -44,15 +42,14 @@ source=("http://linux-libre.fsfla.org/pub/linux-libre/releases/${_pkgbasever}/li
'0002-module-allow-multiple-calls-to-MODULE_DEVICE_TABLE-p.patch'
'0003-module-remove-MODULE_GENERIC_TABLE.patch'
'0006-genksyms-fix-typeof-handling.patch'
- 'revert_timers-dont_raise_softirq_unconditionally_and_fixes.patch'
# loongson-community patch: http://linux-libre.fsfla.org/pub/linux-libre/lemote/gnewsense/pool/debuginfo/
'3.14.14-a410a5e2b7-loongson-community.patch')
sha256sums=('477555c709b9407fe37dbd70d3331ff9dde1f9d874aba2741f138d07ae6f281b'
- '33eae2f5a8c26cfe35b66304afcab43a10e0d04e88c4172e4dc67d9ea2335ce0'
- '267c93d8445bb64e6742c2212c18914e70dcb30994ccf7477731d5b154e7b1b3'
- '2718eaeb33c075bb993eb89c6abc57bf69068ef56fae8d995ce43cdc95700f6e'
- '59d68cdbec555aed09aae5fe2cf363a3665e5eaa09914b6856196eeac6d70311'
- 'da768cb7213ed60296c3d2e5cd774303e938bffafbbd3d9eab372d78b082aab6'
+ 'db8dd32582d14276071e272a7015ebb7c887f1fda5948279e7cb079d78d84ba2'
+ 'cbce51ec97892068679f62b10871fca609617905bc0c029be7bdae78db80a800'
+ '3bfd1d22915bb891a6826f45d3f4f636ddc9f0476dbffff3e650f900f681399d'
+ 'd9b1276ffaa8b4e0d08c8d47114e90167e6c0107764d6004b48a27079efcc40c'
+ 'f84a820e603b0fa980b6b53a36a84383d2d851539aeaaac9fb72c962e3ee1975'
'f0d90e756f14533ee67afda280500511a62465b4f76adcc5effa95a40045179c'
'074b67818582874146c389c029bc43648d145891a27e47aa2c5c42d3571f0264'
'2e87a8ec1cc0c91938cac24992d8a3d4362b3e9d939767e4c9d2ec8e6d969d53'
@@ -62,7 +59,6 @@ sha256sums=('477555c709b9407fe37dbd70d3331ff9dde1f9d874aba2741f138d07ae6f281b'
'52dec83a8805a8642d74d764494acda863e0aa23e3d249e80d4b457e20a3fd29'
'65d58f63215ee3c5f9c4fc6bce36fc5311a6c7dbdbe1ad29de40647b47ff9c0d'
'cf2e7a2d00787f754028e7459688c2755a406e632ce48b60952fa4ff7ed6f4b7'
- 'b0107c64c582f7c6fa2e0c7c32a5f944c644f53b5df04667d487731b3c3b4060'
'3baf1279805edd561e80877a1baf32d98fe07220dc6e7cb4ced73ab531947bc4')
_kernelname=${pkgbase#linux-libre}
@@ -84,13 +80,9 @@ prepare() {
fi
# add realtime patch
-# patch -p1 -i "${srcdir}/patch-${_pkgver%-*}-${_rtpatchver}.patch"
- patch -p1 -i "${srcdir}/patch-${_pkgbasever%-*}.17-${_rtpatchver}.patch"
+ patch -p1 -i "${srcdir}/patch-${_pkgver%-*}-${_rtpatchver}.patch"
rm localversion-rt
- # revert a few troublesome patches
- patch -p1 -i "${srcdir}/revert_timers-dont_raise_softirq_unconditionally_and_fixes.patch"
-
# add freedo as boot logo
install -m644 -t drivers/video/logo \
"${srcdir}/logo_linux_"{clut224.ppm,vga16.ppm,mono.pbm}
diff --git a/kernels/linux-libre-rt/config.i686 b/kernels/linux-libre-rt/config.i686
index 44eebb072..71c85cb91 100644
--- a/kernels/linux-libre-rt/config.i686
+++ b/kernels/linux-libre-rt/config.i686
@@ -1,6 +1,6 @@
#
# Automatically generated file; DO NOT EDIT.
-# Linux/x86 3.14.20-gnu-rt9-1-rt Kernel Configuration
+# Linux/x86 3.14.23-gnu-rt20-1-rt Kernel Configuration
#
# CONFIG_64BIT is not set
CONFIG_X86_32=y
@@ -321,6 +321,7 @@ CONFIG_DEFAULT_IOSCHED="cfq"
CONFIG_PREEMPT_NOTIFIERS=y
CONFIG_PADATA=y
CONFIG_ASN1=m
+CONFIG_ARCH_SUPPORTS_ATOMIC_RMW=y
CONFIG_FREEZER=y
#
@@ -413,6 +414,8 @@ CONFIG_X86_MCE_THRESHOLD=y
# CONFIG_X86_MCE_INJECT is not set
CONFIG_X86_THERMAL_VECTOR=y
CONFIG_VM86=y
+CONFIG_X86_16BIT=y
+CONFIG_X86_ESPFIX32=y
CONFIG_TOSHIBA=m
CONFIG_I8K=m
CONFIG_X86_REBOOTFIXUPS=y
@@ -575,9 +578,9 @@ CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_GOV_COMMON=y
CONFIG_CPU_FREQ_STAT=m
CONFIG_CPU_FREQ_STAT_DETAILS=y
-# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
+CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
-CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
+# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=m
diff --git a/kernels/linux-libre-rt/config.mips64el b/kernels/linux-libre-rt/config.mips64el
index 7587a71de..8d91b2532 100644
--- a/kernels/linux-libre-rt/config.mips64el
+++ b/kernels/linux-libre-rt/config.mips64el
@@ -1,6 +1,6 @@
#
# Automatically generated file; DO NOT EDIT.
-# Linux/mips 3.14.20-gnu-1-rt Kernel Configuration
+# Linux/mips 3.14.23-gnu-rt20-1-rt Kernel Configuration
#
CONFIG_MIPS=y
@@ -418,6 +418,7 @@ CONFIG_DEFAULT_CFQ=y
# CONFIG_DEFAULT_NOOP is not set
CONFIG_DEFAULT_IOSCHED="cfq"
CONFIG_ASN1=m
+CONFIG_ARCH_SUPPORTS_ATOMIC_RMW=y
CONFIG_FREEZER=y
#
diff --git a/kernels/linux-libre-rt/config.x86_64 b/kernels/linux-libre-rt/config.x86_64
index c8ddd239d..850b24222 100644
--- a/kernels/linux-libre-rt/config.x86_64
+++ b/kernels/linux-libre-rt/config.x86_64
@@ -1,6 +1,6 @@
#
# Automatically generated file; DO NOT EDIT.
-# Linux/x86 3.14.20-gnu-rt9-1-rt Kernel Configuration
+# Linux/x86 3.14.23-gnu-rt20-1-rt Kernel Configuration
#
CONFIG_64BIT=y
CONFIG_X86_64=y
@@ -332,6 +332,7 @@ CONFIG_DEFAULT_IOSCHED="cfq"
CONFIG_PREEMPT_NOTIFIERS=y
CONFIG_PADATA=y
CONFIG_ASN1=m
+CONFIG_ARCH_SUPPORTS_ATOMIC_RMW=y
CONFIG_FREEZER=y
#
@@ -407,6 +408,8 @@ CONFIG_X86_MCE_AMD=y
CONFIG_X86_MCE_THRESHOLD=y
# CONFIG_X86_MCE_INJECT is not set
CONFIG_X86_THERMAL_VECTOR=y
+CONFIG_X86_16BIT=y
+CONFIG_X86_ESPFIX64=y
CONFIG_I8K=m
CONFIG_MICROCODE=m
# CONFIG_MICROCODE_INTEL is not set
@@ -577,9 +580,9 @@ CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_GOV_COMMON=y
CONFIG_CPU_FREQ_STAT=m
CONFIG_CPU_FREQ_STAT_DETAILS=y
-# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
+CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
-CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
+# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=m
diff --git a/kernels/linux-libre-rt/patch-3.14.17-rt9.patch b/kernels/linux-libre-rt/patch-3.14.17-rt9.patch
deleted file mode 100644
index 5830ff0cd..000000000
--- a/kernels/linux-libre-rt/patch-3.14.17-rt9.patch
+++ /dev/null
@@ -1,23414 +0,0 @@
-Index: linux-stable/kernel/fork.c
-===================================================================
---- linux-stable.orig/kernel/fork.c
-+++ linux-stable/kernel/fork.c
-@@ -94,7 +94,7 @@ int max_threads; /* tunable limit on nr
-
- DEFINE_PER_CPU(unsigned long, process_counts) = 0;
-
--__cacheline_aligned DEFINE_RWLOCK(tasklist_lock); /* outer */
-+DEFINE_RWLOCK(tasklist_lock); /* outer */
-
- #ifdef CONFIG_PROVE_RCU
- int lockdep_tasklist_lock_is_held(void)
-@@ -230,13 +230,16 @@ static inline void put_signal_struct(str
- if (atomic_dec_and_test(&sig->sigcnt))
- free_signal_struct(sig);
- }
--
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+static
-+#endif
- void __put_task_struct(struct task_struct *tsk)
- {
- WARN_ON(!tsk->exit_state);
- WARN_ON(atomic_read(&tsk->usage));
- WARN_ON(tsk == current);
-
-+ task_numa_free(tsk);
- security_task_free(tsk);
- exit_creds(tsk);
- delayacct_tsk_free(tsk);
-@@ -245,7 +248,18 @@ void __put_task_struct(struct task_struc
- if (!profile_handoff_task(tsk))
- free_task(tsk);
- }
-+#ifndef CONFIG_PREEMPT_RT_BASE
- EXPORT_SYMBOL_GPL(__put_task_struct);
-+#else
-+void __put_task_struct_cb(struct rcu_head *rhp)
-+{
-+ struct task_struct *tsk = container_of(rhp, struct task_struct, put_rcu);
-+
-+ __put_task_struct(tsk);
-+
-+}
-+EXPORT_SYMBOL_GPL(__put_task_struct_cb);
-+#endif
-
- void __init __weak arch_task_cache_init(void) { }
-
-@@ -598,6 +612,19 @@ void __mmdrop(struct mm_struct *mm)
- }
- EXPORT_SYMBOL_GPL(__mmdrop);
-
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+/*
-+ * RCU callback for delayed mm drop. Not strictly rcu, but we don't
-+ * want another facility to make this work.
-+ */
-+void __mmdrop_delayed(struct rcu_head *rhp)
-+{
-+ struct mm_struct *mm = container_of(rhp, struct mm_struct, delayed_drop);
-+
-+ __mmdrop(mm);
-+}
-+#endif
-+
- /*
- * Decrement the use count and release all resources for an mm.
- */
-@@ -1108,6 +1135,9 @@ void mm_init_owner(struct mm_struct *mm,
- */
- static void posix_cpu_timers_init(struct task_struct *tsk)
- {
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ tsk->posix_timer_list = NULL;
-+#endif
- tsk->cputime_expires.prof_exp = 0;
- tsk->cputime_expires.virt_exp = 0;
- tsk->cputime_expires.sched_exp = 0;
-@@ -1235,6 +1265,7 @@ static struct task_struct *copy_process(
- spin_lock_init(&p->alloc_lock);
-
- init_sigpending(&p->pending);
-+ p->sigqueue_cache = NULL;
-
- p->utime = p->stime = p->gtime = 0;
- p->utimescaled = p->stimescaled = 0;
-@@ -1242,7 +1273,8 @@ static struct task_struct *copy_process(
- p->prev_cputime.utime = p->prev_cputime.stime = 0;
- #endif
- #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
-- seqlock_init(&p->vtime_seqlock);
-+ raw_spin_lock_init(&p->vtime_lock);
-+ seqcount_init(&p->vtime_seq);
- p->vtime_snap = 0;
- p->vtime_snap_whence = VTIME_SLEEPING;
- #endif
-@@ -1295,6 +1327,9 @@ static struct task_struct *copy_process(
- p->hardirq_context = 0;
- p->softirq_context = 0;
- #endif
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ p->pagefault_disabled = 0;
-+#endif
- #ifdef CONFIG_LOCKDEP
- p->lockdep_depth = 0; /* no locks held yet */
- p->curr_chain_key = 0;
-Index: linux-stable/kernel/sched/core.c
-===================================================================
---- linux-stable.orig/kernel/sched/core.c
-+++ linux-stable/kernel/sched/core.c
-@@ -272,7 +272,11 @@ late_initcall(sched_init_debug);
- * Number of tasks to iterate in a single balance run.
- * Limited because this is done with IRQs disabled.
- */
-+#ifndef CONFIG_PREEMPT_RT_FULL
- const_debug unsigned int sysctl_sched_nr_migrate = 32;
-+#else
-+const_debug unsigned int sysctl_sched_nr_migrate = 8;
-+#endif
-
- /*
- * period over which we average the RT time consumption, measured
-@@ -489,6 +493,7 @@ static void init_rq_hrtick(struct rq *rq
-
- hrtimer_init(&rq->hrtick_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- rq->hrtick_timer.function = hrtick;
-+ rq->hrtick_timer.irqsafe = 1;
- }
- #else /* CONFIG_SCHED_HRTICK */
- static inline void hrtick_clear(struct rq *rq)
-@@ -534,6 +539,37 @@ void resched_task(struct task_struct *p)
- smp_send_reschedule(cpu);
- }
-
-+#ifdef CONFIG_PREEMPT_LAZY
-+void resched_task_lazy(struct task_struct *p)
-+{
-+ int cpu;
-+
-+ if (!sched_feat(PREEMPT_LAZY)) {
-+ resched_task(p);
-+ return;
-+ }
-+
-+ lockdep_assert_held(&task_rq(p)->lock);
-+
-+ if (test_tsk_need_resched(p))
-+ return;
-+
-+ if (test_tsk_need_resched_lazy(p))
-+ return;
-+
-+ set_tsk_need_resched_lazy(p);
-+
-+ cpu = task_cpu(p);
-+ if (cpu == smp_processor_id())
-+ return;
-+
-+ /* NEED_RESCHED_LAZY must be visible before we test polling */
-+ smp_mb();
-+ if (!tsk_is_polling(p))
-+ smp_send_reschedule(cpu);
-+}
-+#endif
-+
- void resched_cpu(int cpu)
- {
- struct rq *rq = cpu_rq(cpu);
-@@ -1122,6 +1158,18 @@ struct migration_arg {
-
- static int migration_cpu_stop(void *data);
-
-+static bool check_task_state(struct task_struct *p, long match_state)
-+{
-+ bool match = false;
-+
-+ raw_spin_lock_irq(&p->pi_lock);
-+ if (p->state == match_state || p->saved_state == match_state)
-+ match = true;
-+ raw_spin_unlock_irq(&p->pi_lock);
-+
-+ return match;
-+}
-+
- /*
- * wait_task_inactive - wait for a thread to unschedule.
- *
-@@ -1166,7 +1214,7 @@ unsigned long wait_task_inactive(struct
- * is actually now running somewhere else!
- */
- while (task_running(rq, p)) {
-- if (match_state && unlikely(p->state != match_state))
-+ if (match_state && !check_task_state(p, match_state))
- return 0;
- cpu_relax();
- }
-@@ -1181,7 +1229,8 @@ unsigned long wait_task_inactive(struct
- running = task_running(rq, p);
- on_rq = p->on_rq;
- ncsw = 0;
-- if (!match_state || p->state == match_state)
-+ if (!match_state || p->state == match_state
-+ || p->saved_state == match_state)
- ncsw = p->nvcsw | LONG_MIN; /* sets MSB */
- task_rq_unlock(rq, p, &flags);
-
-@@ -1406,10 +1455,6 @@ static void ttwu_activate(struct rq *rq,
- {
- activate_task(rq, p, en_flags);
- p->on_rq = 1;
--
-- /* if a worker is waking up, notify workqueue */
-- if (p->flags & PF_WQ_WORKER)
-- wq_worker_waking_up(p, cpu_of(rq));
- }
-
- /*
-@@ -1592,8 +1637,27 @@ try_to_wake_up(struct task_struct *p, un
- */
- smp_mb__before_spinlock();
- raw_spin_lock_irqsave(&p->pi_lock, flags);
-- if (!(p->state & state))
-+ if (!(p->state & state)) {
-+ /*
-+ * The task might be running due to a spinlock sleeper
-+ * wakeup. Check the saved state and set it to running
-+ * if the wakeup condition is true.
-+ */
-+ if (!(wake_flags & WF_LOCK_SLEEPER)) {
-+ if (p->saved_state & state) {
-+ p->saved_state = TASK_RUNNING;
-+ success = 1;
-+ }
-+ }
- goto out;
-+ }
-+
-+ /*
-+ * If this is a regular wakeup, then we can unconditionally
-+ * clear the saved state of a "lock sleeper".
-+ */
-+ if (!(wake_flags & WF_LOCK_SLEEPER))
-+ p->saved_state = TASK_RUNNING;
-
- success = 1; /* we're going to change ->state */
- cpu = task_cpu(p);
-@@ -1636,42 +1700,6 @@ out:
- }
-
- /**
-- * try_to_wake_up_local - try to wake up a local task with rq lock held
-- * @p: the thread to be awakened
-- *
-- * Put @p on the run-queue if it's not already there. The caller must
-- * ensure that this_rq() is locked, @p is bound to this_rq() and not
-- * the current task.
-- */
--static void try_to_wake_up_local(struct task_struct *p)
--{
-- struct rq *rq = task_rq(p);
--
-- if (WARN_ON_ONCE(rq != this_rq()) ||
-- WARN_ON_ONCE(p == current))
-- return;
--
-- lockdep_assert_held(&rq->lock);
--
-- if (!raw_spin_trylock(&p->pi_lock)) {
-- raw_spin_unlock(&rq->lock);
-- raw_spin_lock(&p->pi_lock);
-- raw_spin_lock(&rq->lock);
-- }
--
-- if (!(p->state & TASK_NORMAL))
-- goto out;
--
-- if (!p->on_rq)
-- ttwu_activate(rq, p, ENQUEUE_WAKEUP);
--
-- ttwu_do_wakeup(rq, p, 0);
-- ttwu_stat(p, smp_processor_id(), 0);
--out:
-- raw_spin_unlock(&p->pi_lock);
--}
--
--/**
- * wake_up_process - Wake up a specific process
- * @p: The process to be woken up.
- *
-@@ -1685,11 +1713,23 @@ out:
- */
- int wake_up_process(struct task_struct *p)
- {
-- WARN_ON(task_is_stopped_or_traced(p));
-+ WARN_ON(__task_is_stopped_or_traced(p));
- return try_to_wake_up(p, TASK_NORMAL, 0);
- }
- EXPORT_SYMBOL(wake_up_process);
-
-+/**
-+ * wake_up_lock_sleeper - Wake up a specific process blocked on a "sleeping lock"
-+ * @p: The process to be woken up.
-+ *
-+ * Same as wake_up_process() above, but wake_flags=WF_LOCK_SLEEPER to indicate
-+ * the nature of the wakeup.
-+ */
-+int wake_up_lock_sleeper(struct task_struct *p)
-+{
-+ return try_to_wake_up(p, TASK_ALL, WF_LOCK_SLEEPER);
-+}
-+
- int wake_up_state(struct task_struct *p, unsigned int state)
- {
- return try_to_wake_up(p, state, 0);
-@@ -1867,6 +1907,9 @@ int sched_fork(unsigned long clone_flags
- p->on_cpu = 0;
- #endif
- init_task_preempt_count(p);
-+#ifdef CONFIG_HAVE_PREEMPT_LAZY
-+ task_thread_info(p)->preempt_lazy_count = 0;
-+#endif
- #ifdef CONFIG_SMP
- plist_node_init(&p->pushable_tasks, MAX_PRIO);
- RB_CLEAR_NODE(&p->pushable_dl_tasks);
-@@ -2146,11 +2189,13 @@ static void finish_task_switch(struct rq
- finish_arch_post_lock_switch();
-
- fire_sched_in_preempt_notifiers(current);
-+ /*
-+ * We use mmdrop_delayed() here so we don't have to do the
-+ * full __mmdrop() when we are the last user.
-+ */
- if (mm)
-- mmdrop(mm);
-+ mmdrop_delayed(mm);
- if (unlikely(prev_state == TASK_DEAD)) {
-- task_numa_free(prev);
--
- if (prev->sched_class->task_dead)
- prev->sched_class->task_dead(prev);
-
-@@ -2510,8 +2555,13 @@ void __kprobes preempt_count_add(int val
- DEBUG_LOCKS_WARN_ON((preempt_count() & PREEMPT_MASK) >=
- PREEMPT_MASK - 10);
- #endif
-- if (preempt_count() == val)
-- trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
-+ if (preempt_count() == val) {
-+ unsigned long ip = get_parent_ip(CALLER_ADDR1);
-+#ifdef CONFIG_DEBUG_PREEMPT
-+ current->preempt_disable_ip = ip;
-+#endif
-+ trace_preempt_off(CALLER_ADDR0, ip);
-+ }
- }
- EXPORT_SYMBOL(preempt_count_add);
-
-@@ -2554,6 +2604,13 @@ static noinline void __schedule_bug(stru
- print_modules();
- if (irqs_disabled())
- print_irqtrace_events(prev);
-+#ifdef CONFIG_DEBUG_PREEMPT
-+ if (in_atomic_preempt_off()) {
-+ pr_err("Preemption disabled at:");
-+ print_ip_sym(current->preempt_disable_ip);
-+ pr_cont("\n");
-+ }
-+#endif
- dump_stack();
- add_taint(TAINT_WARN, LOCKDEP_STILL_OK);
- }
-@@ -2577,6 +2634,133 @@ static inline void schedule_debug(struct
- schedstat_inc(this_rq(), sched_count);
- }
-
-+#if defined(CONFIG_PREEMPT_RT_FULL) && defined(CONFIG_SMP)
-+#define MIGRATE_DISABLE_SET_AFFIN (1<<30) /* Can't make a negative */
-+#define migrate_disabled_updated(p) ((p)->migrate_disable & MIGRATE_DISABLE_SET_AFFIN)
-+#define migrate_disable_count(p) ((p)->migrate_disable & ~MIGRATE_DISABLE_SET_AFFIN)
-+
-+static inline void update_migrate_disable(struct task_struct *p)
-+{
-+ const struct cpumask *mask;
-+
-+ if (likely(!p->migrate_disable))
-+ return;
-+
-+ /* Did we already update affinity? */
-+ if (unlikely(migrate_disabled_updated(p)))
-+ return;
-+
-+ /*
-+ * Since this is always current we can get away with only locking
-+ * rq->lock, the ->cpus_allowed value can normally only be changed
-+ * while holding both p->pi_lock and rq->lock, but seeing that this
-+ * is current, we cannot actually be waking up, so all code that
-+ * relies on serialization against p->pi_lock is out of scope.
-+ *
-+ * Having rq->lock serializes us against things like
-+ * set_cpus_allowed_ptr() that can still happen concurrently.
-+ */
-+ mask = tsk_cpus_allowed(p);
-+
-+ if (p->sched_class->set_cpus_allowed)
-+ p->sched_class->set_cpus_allowed(p, mask);
-+ /* mask==cpumask_of(task_cpu(p)) which has a cpumask_weight==1 */
-+ p->nr_cpus_allowed = 1;
-+
-+ /* Let migrate_enable know to fix things back up */
-+ p->migrate_disable |= MIGRATE_DISABLE_SET_AFFIN;
-+}
-+
-+void migrate_disable(void)
-+{
-+ struct task_struct *p = current;
-+
-+ if (in_atomic()) {
-+#ifdef CONFIG_SCHED_DEBUG
-+ p->migrate_disable_atomic++;
-+#endif
-+ return;
-+ }
-+
-+#ifdef CONFIG_SCHED_DEBUG
-+ if (unlikely(p->migrate_disable_atomic)) {
-+ tracing_off();
-+ WARN_ON_ONCE(1);
-+ }
-+#endif
-+
-+ if (p->migrate_disable) {
-+ p->migrate_disable++;
-+ return;
-+ }
-+
-+ preempt_disable();
-+ preempt_lazy_disable();
-+ pin_current_cpu();
-+ p->migrate_disable = 1;
-+ preempt_enable();
-+}
-+EXPORT_SYMBOL(migrate_disable);
-+
-+void migrate_enable(void)
-+{
-+ struct task_struct *p = current;
-+ const struct cpumask *mask;
-+ unsigned long flags;
-+ struct rq *rq;
-+
-+ if (in_atomic()) {
-+#ifdef CONFIG_SCHED_DEBUG
-+ p->migrate_disable_atomic--;
-+#endif
-+ return;
-+ }
-+
-+#ifdef CONFIG_SCHED_DEBUG
-+ if (unlikely(p->migrate_disable_atomic)) {
-+ tracing_off();
-+ WARN_ON_ONCE(1);
-+ }
-+#endif
-+ WARN_ON_ONCE(p->migrate_disable <= 0);
-+
-+ if (migrate_disable_count(p) > 1) {
-+ p->migrate_disable--;
-+ return;
-+ }
-+
-+ preempt_disable();
-+ if (unlikely(migrate_disabled_updated(p))) {
-+ /*
-+ * Undo whatever update_migrate_disable() did, also see there
-+ * about locking.
-+ */
-+ rq = this_rq();
-+ raw_spin_lock_irqsave(&rq->lock, flags);
-+
-+ /*
-+ * Clearing migrate_disable causes tsk_cpus_allowed to
-+ * show the tasks original cpu affinity.
-+ */
-+ p->migrate_disable = 0;
-+ mask = tsk_cpus_allowed(p);
-+ if (p->sched_class->set_cpus_allowed)
-+ p->sched_class->set_cpus_allowed(p, mask);
-+ p->nr_cpus_allowed = cpumask_weight(mask);
-+ raw_spin_unlock_irqrestore(&rq->lock, flags);
-+ } else
-+ p->migrate_disable = 0;
-+
-+ unpin_current_cpu();
-+ preempt_enable();
-+ preempt_lazy_enable();
-+}
-+EXPORT_SYMBOL(migrate_enable);
-+#else
-+static inline void update_migrate_disable(struct task_struct *p) { }
-+#define migrate_disabled_updated(p) 0
-+#endif
-+
- static void put_prev_task(struct rq *rq, struct task_struct *prev)
- {
- if (prev->on_rq || rq->skip_clock_update < 0)
-@@ -2676,6 +2860,8 @@ need_resched:
- smp_mb__before_spinlock();
- raw_spin_lock_irq(&rq->lock);
-
-+ update_migrate_disable(prev);
-+
- switch_count = &prev->nivcsw;
- if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
- if (unlikely(signal_pending_state(prev->state, prev))) {
-@@ -2683,19 +2869,6 @@ need_resched:
- } else {
- deactivate_task(rq, prev, DEQUEUE_SLEEP);
- prev->on_rq = 0;
--
-- /*
-- * If a worker went to sleep, notify and ask workqueue
-- * whether it wants to wake up a task to maintain
-- * concurrency.
-- */
-- if (prev->flags & PF_WQ_WORKER) {
-- struct task_struct *to_wakeup;
--
-- to_wakeup = wq_worker_sleeping(prev, cpu);
-- if (to_wakeup)
-- try_to_wake_up_local(to_wakeup);
-- }
- }
- switch_count = &prev->nvcsw;
- }
-@@ -2708,6 +2881,7 @@ need_resched:
- put_prev_task(rq, prev);
- next = pick_next_task(rq);
- clear_tsk_need_resched(prev);
-+ clear_tsk_need_resched_lazy(prev);
- clear_preempt_need_resched();
- rq->skip_clock_update = 0;
-
-@@ -2737,8 +2911,19 @@ need_resched:
-
- static inline void sched_submit_work(struct task_struct *tsk)
- {
-- if (!tsk->state || tsk_is_pi_blocked(tsk))
-+ if (!tsk->state)
-+ return;
-+ /*
-+ * If a worker went to sleep, notify and ask workqueue whether
-+ * it wants to wake up a task to maintain concurrency.
-+ */
-+ if (tsk->flags & PF_WQ_WORKER)
-+ wq_worker_sleeping(tsk);
-+
-+
-+ if (tsk_is_pi_blocked(tsk))
- return;
-+
- /*
- * If we are going to sleep and we have plugged IO queued,
- * make sure to submit it to avoid deadlocks.
-@@ -2747,12 +2932,19 @@ static inline void sched_submit_work(str
- blk_schedule_flush_plug(tsk);
- }
-
-+static inline void sched_update_worker(struct task_struct *tsk)
-+{
-+ if (tsk->flags & PF_WQ_WORKER)
-+ wq_worker_running(tsk);
-+}
-+
- asmlinkage void __sched schedule(void)
- {
- struct task_struct *tsk = current;
-
- sched_submit_work(tsk);
- __schedule();
-+ sched_update_worker(tsk);
- }
- EXPORT_SYMBOL(schedule);
-
-@@ -2798,9 +2990,26 @@ asmlinkage void __sched notrace preempt_
- if (likely(!preemptible()))
- return;
-
-+#ifdef CONFIG_PREEMPT_LAZY
-+ /*
-+ * Check for lazy preemption
-+ */
-+ if (current_thread_info()->preempt_lazy_count &&
-+ !test_thread_flag(TIF_NEED_RESCHED))
-+ return;
-+#endif
- do {
- __preempt_count_add(PREEMPT_ACTIVE);
-+ /*
-+ * The add/subtract must not be traced by the function
-+ * tracer. But we still want to account for the
-+ * preempt off latency tracer. Since the _notrace versions
-+ * of add/subtract skip the accounting for latency tracer
-+ * we must force it manually.
-+ */
-+ start_critical_timings();
- __schedule();
-+ stop_critical_timings();
- __preempt_count_sub(PREEMPT_ACTIVE);
-
- /*
-@@ -2908,7 +3117,8 @@ EXPORT_SYMBOL(sleep_on_timeout);
- * This function changes the 'effective' priority of a task. It does
- * not touch ->normal_prio like __setscheduler().
- *
-- * Used by the rt_mutex code to implement priority inheritance logic.
-+ * Used by the rt_mutex code to implement priority inheritance
-+ * logic. Call site only calls if the priority of the task changed.
- */
- void rt_mutex_setprio(struct task_struct *p, int prio)
- {
-@@ -3189,9 +3399,8 @@ __setparam_dl(struct task_struct *p, con
- dl_se->dl_new = 1;
- }
-
--/* Actually do priority change: must hold pi & rq lock. */
--static void __setscheduler(struct rq *rq, struct task_struct *p,
-- const struct sched_attr *attr)
-+static void __setscheduler_params(struct task_struct *p,
-+ const struct sched_attr *attr)
- {
- int policy = attr->sched_policy;
-
-@@ -3211,9 +3420,21 @@ static void __setscheduler(struct rq *rq
- * getparam()/getattr() don't report silly values for !rt tasks.
- */
- p->rt_priority = attr->sched_priority;
--
- p->normal_prio = normal_prio(p);
-- p->prio = rt_mutex_getprio(p);
-+ set_load_weight(p);
-+}
-+
-+/* Actually do priority change: must hold pi & rq lock. */
-+static void __setscheduler(struct rq *rq, struct task_struct *p,
-+ const struct sched_attr *attr)
-+{
-+ __setscheduler_params(p, attr);
-+
-+ /*
-+ * If we get here, there was no pi waiters boosting the
-+ * task. It is safe to use the normal prio.
-+ */
-+ p->prio = normal_prio(p);
-
- if (dl_prio(p->prio))
- p->sched_class = &dl_sched_class;
-@@ -3221,8 +3442,6 @@ static void __setscheduler(struct rq *rq
- p->sched_class = &rt_sched_class;
- else
- p->sched_class = &fair_sched_class;
--
-- set_load_weight(p);
- }
-
- static void
-@@ -3298,6 +3517,8 @@ static int __sched_setscheduler(struct t
- const struct sched_attr *attr,
- bool user)
- {
-+ int newprio = dl_policy(attr->sched_policy) ? MAX_DL_PRIO - 1 :
-+ MAX_RT_PRIO - 1 - attr->sched_priority;
- int retval, oldprio, oldpolicy = -1, on_rq, running;
- int policy = attr->sched_policy;
- unsigned long flags;
-@@ -3422,6 +3643,7 @@ recheck:
- if (dl_policy(policy))
- goto change;
-
-+ p->sched_reset_on_fork = reset_on_fork;
- task_rq_unlock(rq, p, &flags);
- return 0;
- }
-@@ -3475,6 +3697,24 @@ change:
- return -EBUSY;
- }
-
-+ p->sched_reset_on_fork = reset_on_fork;
-+ oldprio = p->prio;
-+
-+ /*
-+ * Special case for priority boosted tasks.
-+ *
-+ * If the new priority is lower or equal (user space view)
-+ * than the current (boosted) priority, we just store the new
-+ * normal parameters and do not touch the scheduler class and
-+ * the runqueue. This will be done when the task deboost
-+ * itself.
-+ */
-+ if (rt_mutex_check_prio(p, newprio)) {
-+ __setscheduler_params(p, attr);
-+ task_rq_unlock(rq, p, &flags);
-+ return 0;
-+ }
-+
- on_rq = p->on_rq;
- running = task_current(rq, p);
- if (on_rq)
-@@ -3482,16 +3722,18 @@ change:
- if (running)
- p->sched_class->put_prev_task(rq, p);
-
-- p->sched_reset_on_fork = reset_on_fork;
--
-- oldprio = p->prio;
- prev_class = p->sched_class;
- __setscheduler(rq, p, attr);
-
- if (running)
- p->sched_class->set_curr_task(rq);
-- if (on_rq)
-- enqueue_task(rq, p, 0);
-+ if (on_rq) {
-+ /*
-+ * We enqueue to tail when the priority of a task is
-+ * increased (user space view).
-+ */
-+ enqueue_task(rq, p, oldprio <= p->prio ? ENQUEUE_HEAD : 0);
-+ }
-
- check_class_changed(rq, p, prev_class, oldprio);
- task_rq_unlock(rq, p, &flags);
-@@ -4098,9 +4340,16 @@ SYSCALL_DEFINE0(sched_yield)
-
- static void __cond_resched(void)
- {
-- __preempt_count_add(PREEMPT_ACTIVE);
-- __schedule();
-- __preempt_count_sub(PREEMPT_ACTIVE);
-+ do {
-+ __preempt_count_add(PREEMPT_ACTIVE);
-+ __schedule();
-+ __preempt_count_sub(PREEMPT_ACTIVE);
-+ /*
-+ * Check again in case we missed a preemption
-+ * opportunity between schedule and now.
-+ */
-+ barrier();
-+ } while (need_resched());
- }
-
- int __sched _cond_resched(void)
-@@ -4141,6 +4390,7 @@ int __cond_resched_lock(spinlock_t *lock
- }
- EXPORT_SYMBOL(__cond_resched_lock);
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- int __sched __cond_resched_softirq(void)
- {
- BUG_ON(!in_softirq());
-@@ -4154,6 +4404,7 @@ int __sched __cond_resched_softirq(void)
- return 0;
- }
- EXPORT_SYMBOL(__cond_resched_softirq);
-+#endif
-
- /**
- * yield - yield the current processor to other threads.
-@@ -4507,6 +4758,7 @@ void init_idle(struct task_struct *idle,
- rcu_read_unlock();
-
- rq->curr = rq->idle = idle;
-+ idle->on_rq = 1;
- #if defined(CONFIG_SMP)
- idle->on_cpu = 1;
- #endif
-@@ -4514,7 +4766,9 @@ void init_idle(struct task_struct *idle,
-
- /* Set the preempt count _outside_ the spinlocks! */
- init_idle_preempt_count(idle, cpu);
--
-+#ifdef CONFIG_HAVE_PREEMPT_LAZY
-+ task_thread_info(idle)->preempt_lazy_count = 0;
-+#endif
- /*
- * The idle tasks have their own, simple scheduling class:
- */
-@@ -4529,11 +4783,90 @@ void init_idle(struct task_struct *idle,
- #ifdef CONFIG_SMP
- void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
- {
-- if (p->sched_class && p->sched_class->set_cpus_allowed)
-- p->sched_class->set_cpus_allowed(p, new_mask);
--
-+ if (!migrate_disabled_updated(p)) {
-+ if (p->sched_class && p->sched_class->set_cpus_allowed)
-+ p->sched_class->set_cpus_allowed(p, new_mask);
-+ p->nr_cpus_allowed = cpumask_weight(new_mask);
-+ }
- cpumask_copy(&p->cpus_allowed, new_mask);
-- p->nr_cpus_allowed = cpumask_weight(new_mask);
-+}
-+
-+static DEFINE_PER_CPU(struct cpumask, sched_cpumasks);
-+static DEFINE_MUTEX(sched_down_mutex);
-+static cpumask_t sched_down_cpumask;
-+
-+void tell_sched_cpu_down_begin(int cpu)
-+{
-+ mutex_lock(&sched_down_mutex);
-+ cpumask_set_cpu(cpu, &sched_down_cpumask);
-+ mutex_unlock(&sched_down_mutex);
-+}
-+
-+void tell_sched_cpu_down_done(int cpu)
-+{
-+ mutex_lock(&sched_down_mutex);
-+ cpumask_clear_cpu(cpu, &sched_down_cpumask);
-+ mutex_unlock(&sched_down_mutex);
-+}
-+
-+/**
-+ * migrate_me - try to move the current task off this cpu
-+ *
-+ * Used by the pin_current_cpu() code to try to get tasks
-+ * to move off the current CPU as it is going down.
-+ * It will only move the task if the task isn't pinned to
-+ * the CPU (with migrate_disable, affinity or NO_SETAFFINITY)
-+ * and the task has to be in a RUNNING state. Otherwise the
-+ * movement of the task will wake it up (change its state
-+ * to running) when the task did not expect it.
-+ *
-+ * Returns 1 if it succeeded in moving the current task
-+ * 0 otherwise.
-+ */
-+int migrate_me(void)
-+{
-+ struct task_struct *p = current;
-+ struct migration_arg arg;
-+ struct cpumask *cpumask;
-+ struct cpumask *mask;
-+ unsigned long flags;
-+ unsigned int dest_cpu;
-+ struct rq *rq;
-+
-+ /*
-+ * We can not migrate tasks bounded to a CPU or tasks not
-+ * running. The movement of the task will wake it up.
-+ */
-+ if (p->flags & PF_NO_SETAFFINITY || p->state)
-+ return 0;
-+
-+ mutex_lock(&sched_down_mutex);
-+ rq = task_rq_lock(p, &flags);
-+
-+ cpumask = &__get_cpu_var(sched_cpumasks);
-+ mask = &p->cpus_allowed;
-+
-+ cpumask_andnot(cpumask, mask, &sched_down_cpumask);
-+
-+ if (!cpumask_weight(cpumask)) {
-+ /* It's only on this CPU? */
-+ task_rq_unlock(rq, p, &flags);
-+ mutex_unlock(&sched_down_mutex);
-+ return 0;
-+ }
-+
-+ dest_cpu = cpumask_any_and(cpu_active_mask, cpumask);
-+
-+ arg.task = p;
-+ arg.dest_cpu = dest_cpu;
-+
-+ task_rq_unlock(rq, p, &flags);
-+
-+ stop_one_cpu(cpu_of(rq), migration_cpu_stop, &arg);
-+ tlb_migrate_finish(p->mm);
-+ mutex_unlock(&sched_down_mutex);
-+
-+ return 1;
- }
-
- /*
-@@ -4579,7 +4912,7 @@ int set_cpus_allowed_ptr(struct task_str
- do_set_cpus_allowed(p, new_mask);
-
- /* Can the task run on the task's current CPU? If so, we're done */
-- if (cpumask_test_cpu(task_cpu(p), new_mask))
-+ if (cpumask_test_cpu(task_cpu(p), new_mask) || __migrate_disabled(p))
- goto out;
-
- dest_cpu = cpumask_any_and(cpu_active_mask, new_mask);
-@@ -4716,6 +5049,8 @@ static int migration_cpu_stop(void *data
-
- #ifdef CONFIG_HOTPLUG_CPU
-
-+static DEFINE_PER_CPU(struct mm_struct *, idle_last_mm);
-+
- /*
- * Ensures that the idle task is using init_mm right before its cpu goes
- * offline.
-@@ -4728,7 +5063,12 @@ void idle_task_exit(void)
-
- if (mm != &init_mm)
- switch_mm(mm, &init_mm, current);
-- mmdrop(mm);
-+
-+ /*
-+ * Defer the cleanup to an alive cpu. On RT we can neither
-+ * call mmdrop() nor mmdrop_delayed() from here.
-+ */
-+ per_cpu(idle_last_mm, smp_processor_id()) = mm;
- }
-
- /*
-@@ -5052,6 +5392,10 @@ migration_call(struct notifier_block *nf
-
- case CPU_DEAD:
- calc_load_migrate(rq);
-+ if (per_cpu(idle_last_mm, cpu)) {
-+ mmdrop(per_cpu(idle_last_mm, cpu));
-+ per_cpu(idle_last_mm, cpu) = NULL;
-+ }
- break;
- #endif
- }
-@@ -6960,7 +7304,8 @@ void __init sched_init(void)
- #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
- static inline int preempt_count_equals(int preempt_offset)
- {
-- int nested = (preempt_count() & ~PREEMPT_ACTIVE) + rcu_preempt_depth();
-+ int nested = (preempt_count() & ~PREEMPT_ACTIVE) +
-+ sched_rcu_preempt_depth();
-
- return (nested == preempt_offset);
- }
-@@ -6970,7 +7315,8 @@ void __might_sleep(const char *file, int
- static unsigned long prev_jiffy; /* ratelimiting */
-
- rcu_sleep_check(); /* WARN_ON_ONCE() by default, no rate limit reqd. */
-- if ((preempt_count_equals(preempt_offset) && !irqs_disabled()) ||
-+ if ((preempt_count_equals(preempt_offset) && !irqs_disabled() &&
-+ !is_idle_task(current)) ||
- system_state != SYSTEM_RUNNING || oops_in_progress)
- return;
- if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy)
-@@ -6988,6 +7334,13 @@ void __might_sleep(const char *file, int
- debug_show_held_locks(current);
- if (irqs_disabled())
- print_irqtrace_events(current);
-+#ifdef CONFIG_DEBUG_PREEMPT
-+ if (!preempt_count_equals(preempt_offset)) {
-+ pr_err("Preemption disabled at:");
-+ print_ip_sym(current->preempt_disable_ip);
-+ pr_cont("\n");
-+ }
-+#endif
- dump_stack();
- }
- EXPORT_SYMBOL(__might_sleep);
-Index: linux-stable/include/linux/sched.h
-===================================================================
---- linux-stable.orig/include/linux/sched.h
-+++ linux-stable/include/linux/sched.h
-@@ -24,6 +24,7 @@ struct sched_param {
- #include <linux/nodemask.h>
- #include <linux/mm_types.h>
- #include <linux/preempt_mask.h>
-+#include <asm/kmap_types.h>
-
- #include <asm/page.h>
- #include <asm/ptrace.h>
-@@ -54,6 +55,7 @@ struct sched_param {
- #include <linux/llist.h>
- #include <linux/uidgid.h>
- #include <linux/gfp.h>
-+#include <linux/hardirq.h>
-
- #include <asm/processor.h>
-
-@@ -232,10 +234,7 @@ extern char ___assert_task_state[1 - 2*!
- TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
- __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD)
-
--#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
- #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
--#define task_is_stopped_or_traced(task) \
-- ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
- #define task_contributes_to_load(task) \
- ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
- (task->flags & PF_FROZEN) == 0)
-@@ -1163,6 +1162,7 @@ enum perf_event_task_context {
-
- struct task_struct {
- volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
-+ volatile long saved_state; /* saved state for "spinlock sleepers" */
- void *stack;
- atomic_t usage;
- unsigned int flags; /* per process flags, defined below */
-@@ -1199,6 +1199,12 @@ struct task_struct {
- #endif
-
- unsigned int policy;
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ int migrate_disable;
-+# ifdef CONFIG_SCHED_DEBUG
-+ int migrate_disable_atomic;
-+# endif
-+#endif
- int nr_cpus_allowed;
- cpumask_t cpus_allowed;
-
-@@ -1295,7 +1301,8 @@ struct task_struct {
- struct cputime prev_cputime;
- #endif
- #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
-- seqlock_t vtime_seqlock;
-+ raw_spinlock_t vtime_lock;
-+ seqcount_t vtime_seq;
- unsigned long long vtime_snap;
- enum {
- VTIME_SLEEPING = 0,
-@@ -1311,6 +1318,9 @@ struct task_struct {
-
- struct task_cputime cputime_expires;
- struct list_head cpu_timers[3];
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ struct task_struct *posix_timer_list;
-+#endif
-
- /* process credentials */
- const struct cred __rcu *real_cred; /* objective and real subjective task
-@@ -1342,10 +1352,15 @@ struct task_struct {
- /* signal handlers */
- struct signal_struct *signal;
- struct sighand_struct *sighand;
-+ struct sigqueue *sigqueue_cache;
-
- sigset_t blocked, real_blocked;
- sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
- struct sigpending pending;
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ /* TODO: move me into ->restart_block ? */
-+ struct siginfo forced_info;
-+#endif
-
- unsigned long sas_ss_sp;
- size_t sas_ss_size;
-@@ -1385,6 +1400,9 @@ struct task_struct {
- /* mutex deadlock detection */
- struct mutex_waiter *blocked_on;
- #endif
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ int pagefault_disabled;
-+#endif
- #ifdef CONFIG_TRACE_IRQFLAGS
- unsigned int irq_events;
- unsigned long hardirq_enable_ip;
-@@ -1460,6 +1478,9 @@ struct task_struct {
- struct mutex perf_event_mutex;
- struct list_head perf_event_list;
- #endif
-+#ifdef CONFIG_DEBUG_PREEMPT
-+ unsigned long preempt_disable_ip;
-+#endif
- #ifdef CONFIG_NUMA
- struct mempolicy *mempolicy; /* Protected by alloc_lock */
- short il_next;
-@@ -1558,6 +1579,12 @@ struct task_struct {
- unsigned long trace;
- /* bitmask and counter of trace recursion */
- unsigned long trace_recursion;
-+#ifdef CONFIG_WAKEUP_LATENCY_HIST
-+ u64 preempt_timestamp_hist;
-+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
-+ long timer_offset;
-+#endif
-+#endif
- #endif /* CONFIG_TRACING */
- #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
- struct memcg_batch_info {
-@@ -1581,11 +1608,19 @@ struct task_struct {
- unsigned int sequential_io;
- unsigned int sequential_io_avg;
- #endif
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ struct rcu_head put_rcu;
-+ int softirq_nestcnt;
-+ unsigned int softirqs_raised;
-+#endif
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+# if defined CONFIG_HIGHMEM || defined CONFIG_X86_32
-+ int kmap_idx;
-+ pte_t kmap_pte[KM_TYPE_NR];
-+# endif
-+#endif
- };
-
--/* Future-safe accessor for struct task_struct's cpus_allowed. */
--#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
--
- #define TNF_MIGRATED 0x01
- #define TNF_NO_GROUP 0x02
- #define TNF_SHARED 0x04
-@@ -1615,6 +1650,17 @@ static inline void task_numa_free(struct
- }
- #endif
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+static inline bool cur_pf_disabled(void) { return current->pagefault_disabled; }
-+#else
-+static inline bool cur_pf_disabled(void) { return false; }
-+#endif
-+
-+static inline bool pagefault_disabled(void)
-+{
-+ return in_atomic() || cur_pf_disabled();
-+}
-+
- static inline struct pid *task_pid(struct task_struct *task)
- {
- return task->pids[PIDTYPE_PID].pid;
-@@ -1768,6 +1814,15 @@ extern struct pid *cad_pid;
- extern void free_task(struct task_struct *tsk);
- #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
-
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+extern void __put_task_struct_cb(struct rcu_head *rhp);
-+
-+static inline void put_task_struct(struct task_struct *t)
-+{
-+ if (atomic_dec_and_test(&t->usage))
-+ call_rcu(&t->put_rcu, __put_task_struct_cb);
-+}
-+#else
- extern void __put_task_struct(struct task_struct *t);
-
- static inline void put_task_struct(struct task_struct *t)
-@@ -1775,6 +1830,7 @@ static inline void put_task_struct(struc
- if (atomic_dec_and_test(&t->usage))
- __put_task_struct(t);
- }
-+#endif
-
- #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
- extern void task_cputime(struct task_struct *t,
-@@ -1813,6 +1869,7 @@ extern void thread_group_cputime_adjuste
- /*
- * Per process flags
- */
-+#define PF_IN_SOFTIRQ 0x00000001 /* Task is serving softirq */
- #define PF_EXITING 0x00000004 /* getting shut down */
- #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
- #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
-@@ -1958,6 +2015,10 @@ extern void do_set_cpus_allowed(struct t
-
- extern int set_cpus_allowed_ptr(struct task_struct *p,
- const struct cpumask *new_mask);
-+int migrate_me(void);
-+void tell_sched_cpu_down_begin(int cpu);
-+void tell_sched_cpu_down_done(int cpu);
-+
- #else
- static inline void do_set_cpus_allowed(struct task_struct *p,
- const struct cpumask *new_mask)
-@@ -1970,6 +2031,9 @@ static inline int set_cpus_allowed_ptr(s
- return -EINVAL;
- return 0;
- }
-+static inline int migrate_me(void) { return 0; }
-+static inline void tell_sched_cpu_down_begin(int cpu) { }
-+static inline void tell_sched_cpu_down_done(int cpu) { }
- #endif
-
- #ifdef CONFIG_NO_HZ_COMMON
-@@ -2181,6 +2245,7 @@ extern void xtime_update(unsigned long t
-
- extern int wake_up_state(struct task_struct *tsk, unsigned int state);
- extern int wake_up_process(struct task_struct *tsk);
-+extern int wake_up_lock_sleeper(struct task_struct * tsk);
- extern void wake_up_new_task(struct task_struct *tsk);
- #ifdef CONFIG_SMP
- extern void kick_process(struct task_struct *tsk);
-@@ -2295,12 +2360,24 @@ extern struct mm_struct * mm_alloc(void)
-
- /* mmdrop drops the mm and the page tables */
- extern void __mmdrop(struct mm_struct *);
-+
- static inline void mmdrop(struct mm_struct * mm)
- {
- if (unlikely(atomic_dec_and_test(&mm->mm_count)))
- __mmdrop(mm);
- }
-
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+extern void __mmdrop_delayed(struct rcu_head *rhp);
-+static inline void mmdrop_delayed(struct mm_struct *mm)
-+{
-+ if (atomic_dec_and_test(&mm->mm_count))
-+ call_rcu(&mm->delayed_drop, __mmdrop_delayed);
-+}
-+#else
-+# define mmdrop_delayed(mm) mmdrop(mm)
-+#endif
-+
- /* mmput gets rid of the mappings and all user-space */
- extern void mmput(struct mm_struct *);
- /* Grab a reference to a task's mm, if it is not already going away */
-@@ -2591,6 +2668,43 @@ static inline int test_tsk_need_resched(
- return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
- }
-
-+#ifdef CONFIG_PREEMPT_LAZY
-+static inline void set_tsk_need_resched_lazy(struct task_struct *tsk)
-+{
-+ set_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY);
-+}
-+
-+static inline void clear_tsk_need_resched_lazy(struct task_struct *tsk)
-+{
-+ clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY);
-+}
-+
-+static inline int test_tsk_need_resched_lazy(struct task_struct *tsk)
-+{
-+ return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY));
-+}
-+
-+static inline int need_resched_lazy(void)
-+{
-+ return test_thread_flag(TIF_NEED_RESCHED_LAZY);
-+}
-+
-+static inline int need_resched_now(void)
-+{
-+ return test_thread_flag(TIF_NEED_RESCHED);
-+}
-+
-+#else
-+static inline void clear_tsk_need_resched_lazy(struct task_struct *tsk) { }
-+static inline int need_resched_lazy(void) { return 0; }
-+
-+static inline int need_resched_now(void)
-+{
-+ return test_thread_flag(TIF_NEED_RESCHED);
-+}
-+
-+#endif
-+
- static inline int restart_syscall(void)
- {
- set_tsk_thread_flag(current, TIF_SIGPENDING);
-@@ -2622,6 +2736,51 @@ static inline int signal_pending_state(l
- return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
- }
-
-+static inline bool __task_is_stopped_or_traced(struct task_struct *task)
-+{
-+ if (task->state & (__TASK_STOPPED | __TASK_TRACED))
-+ return true;
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ if (task->saved_state & (__TASK_STOPPED | __TASK_TRACED))
-+ return true;
-+#endif
-+ return false;
-+}
-+
-+static inline bool task_is_stopped_or_traced(struct task_struct *task)
-+{
-+ bool traced_stopped;
-+
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ unsigned long flags;
-+
-+ raw_spin_lock_irqsave(&task->pi_lock, flags);
-+ traced_stopped = __task_is_stopped_or_traced(task);
-+ raw_spin_unlock_irqrestore(&task->pi_lock, flags);
-+#else
-+ traced_stopped = __task_is_stopped_or_traced(task);
-+#endif
-+ return traced_stopped;
-+}
-+
-+static inline bool task_is_traced(struct task_struct *task)
-+{
-+ bool traced = false;
-+
-+ if (task->state & __TASK_TRACED)
-+ return true;
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ /* in case the task is sleeping on tasklist_lock */
-+ raw_spin_lock_irq(&task->pi_lock);
-+ if (task->state & __TASK_TRACED)
-+ traced = true;
-+ else if (task->saved_state & __TASK_TRACED)
-+ traced = true;
-+ raw_spin_unlock_irq(&task->pi_lock);
-+#endif
-+ return traced;
-+}
-+
- /*
- * cond_resched() and cond_resched_lock(): latency reduction via
- * explicit rescheduling in places that are safe. The return
-@@ -2638,7 +2797,7 @@ extern int _cond_resched(void);
-
- extern int __cond_resched_lock(spinlock_t *lock);
-
--#ifdef CONFIG_PREEMPT_COUNT
-+#if defined(CONFIG_PREEMPT_COUNT) && !defined(CONFIG_PREEMPT_RT_FULL)
- #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
- #else
- #define PREEMPT_LOCK_OFFSET 0
-@@ -2649,12 +2808,16 @@ extern int __cond_resched_lock(spinlock_
- __cond_resched_lock(lock); \
- })
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- extern int __cond_resched_softirq(void);
-
- #define cond_resched_softirq() ({ \
- __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
- __cond_resched_softirq(); \
- })
-+#else
-+# define cond_resched_softirq() cond_resched()
-+#endif
-
- static inline void cond_resched_rcu(void)
- {
-@@ -2865,6 +3028,26 @@ static inline void set_task_cpu(struct t
-
- #endif /* CONFIG_SMP */
-
-+static inline int __migrate_disabled(struct task_struct *p)
-+{
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ return p->migrate_disable;
-+#else
-+ return 0;
-+#endif
-+}
-+
-+/* Future-safe accessor for struct task_struct's cpus_allowed. */
-+static inline const struct cpumask *tsk_cpus_allowed(struct task_struct *p)
-+{
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ if (p->migrate_disable)
-+ return cpumask_of(task_cpu(p));
-+#endif
-+
-+ return &p->cpus_allowed;
-+}
-+
- extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
- extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
-
-Index: linux-stable/include/linux/sched/rt.h
-===================================================================
---- linux-stable.orig/include/linux/sched/rt.h
-+++ linux-stable/include/linux/sched/rt.h
-@@ -35,6 +35,7 @@ static inline int rt_task(struct task_st
- #ifdef CONFIG_RT_MUTEXES
- extern int rt_mutex_getprio(struct task_struct *p);
- extern void rt_mutex_setprio(struct task_struct *p, int prio);
-+extern int rt_mutex_check_prio(struct task_struct *task, int newprio);
- extern struct task_struct *rt_mutex_get_top_task(struct task_struct *task);
- extern void rt_mutex_adjust_pi(struct task_struct *p);
- static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
-@@ -46,6 +47,12 @@ static inline int rt_mutex_getprio(struc
- {
- return p->normal_prio;
- }
-+
-+static inline int rt_mutex_check_prio(struct task_struct *task, int newprio)
-+{
-+ return 0;
-+}
-+
- static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *task)
- {
- return NULL;
-Index: linux-stable/kernel/locking/rtmutex.c
-===================================================================
---- linux-stable.orig/kernel/locking/rtmutex.c
-+++ linux-stable/kernel/locking/rtmutex.c
-@@ -8,6 +8,12 @@
- * Copyright (C) 2005 Kihon Technologies Inc., Steven Rostedt
- * Copyright (C) 2006 Esben Nielsen
- *
-+ * Adaptive Spinlocks:
-+ * Copyright (C) 2008 Novell, Inc., Gregory Haskins, Sven Dietrich,
-+ * and Peter Morreale,
-+ * Adaptive Spinlocks simplification:
-+ * Copyright (C) 2008 Red Hat, Inc., Steven Rostedt <srostedt@redhat.com>
-+ *
- * See Documentation/rt-mutex-design.txt for details.
- */
- #include <linux/spinlock.h>
-@@ -16,6 +22,7 @@
- #include <linux/sched/rt.h>
- #include <linux/sched/deadline.h>
- #include <linux/timer.h>
-+#include <linux/ww_mutex.h>
-
- #include "rtmutex_common.h"
-
-@@ -69,6 +76,12 @@ static void fixup_rt_mutex_waiters(struc
- clear_rt_mutex_waiters(lock);
- }
-
-+static int rt_mutex_real_waiter(struct rt_mutex_waiter *waiter)
-+{
-+ return waiter && waiter != PI_WAKEUP_INPROGRESS &&
-+ waiter != PI_REQUEUE_INPROGRESS;
-+}
-+
- /*
- * We can speed up the acquire/release, if the architecture
- * supports cmpxchg and if there's no debugging state to be set up
-@@ -265,6 +278,18 @@ struct task_struct *rt_mutex_get_top_tas
- }
-
- /*
-+ * Called by sched_setscheduler() to check whether the priority change
-+ * is overruled by a possible priority boosting.
-+ */
-+int rt_mutex_check_prio(struct task_struct *task, int newprio)
-+{
-+ if (!task_has_pi_waiters(task))
-+ return 0;
-+
-+ return task_top_pi_waiter(task)->task->prio <= newprio;
-+}
-+
-+/*
- * Adjust the priority of a task, after its pi_waiters got modified.
- *
- * This can be both boosting and unboosting. task->pi_lock must be held.
-@@ -295,6 +320,14 @@ static void rt_mutex_adjust_prio(struct
- raw_spin_unlock_irqrestore(&task->pi_lock, flags);
- }
-
-+static void rt_mutex_wake_waiter(struct rt_mutex_waiter *waiter)
-+{
-+ if (waiter->savestate)
-+ wake_up_lock_sleeper(waiter->task);
-+ else
-+ wake_up_process(waiter->task);
-+}
-+
- /*
- * Max number of times we'll walk the boosting chain:
- */
-@@ -377,7 +410,7 @@ static int rt_mutex_adjust_prio_chain(st
- * reached or the state of the chain has changed while we
- * dropped the locks.
- */
-- if (!waiter)
-+ if (!rt_mutex_real_waiter(waiter))
- goto out_unlock_pi;
-
- /*
-@@ -452,13 +485,15 @@ static int rt_mutex_adjust_prio_chain(st
- /* Release the task */
- raw_spin_unlock_irqrestore(&task->pi_lock, flags);
- if (!rt_mutex_owner(lock)) {
-+ struct rt_mutex_waiter *lock_top_waiter;
-+
- /*
- * If the requeue above changed the top waiter, then we need
- * to wake the new top waiter up to try to get the lock.
- */
--
-- if (top_waiter != rt_mutex_top_waiter(lock))
-- wake_up_process(rt_mutex_top_waiter(lock)->task);
-+ lock_top_waiter = rt_mutex_top_waiter(lock);
-+ if (top_waiter != lock_top_waiter)
-+ rt_mutex_wake_waiter(lock_top_waiter);
- raw_spin_unlock(&lock->wait_lock);
- goto out_put_task;
- }
-@@ -516,6 +551,25 @@ static int rt_mutex_adjust_prio_chain(st
- return ret;
- }
-
-+
-+#define STEAL_NORMAL 0
-+#define STEAL_LATERAL 1
-+
-+/*
-+ * Note that RT tasks are excluded from lateral-steals to prevent the
-+ * introduction of an unbounded latency
-+ */
-+static inline int lock_is_stealable(struct task_struct *task,
-+ struct task_struct *pendowner, int mode)
-+{
-+ if (mode == STEAL_NORMAL || rt_task(task)) {
-+ if (task->prio >= pendowner->prio)
-+ return 0;
-+ } else if (task->prio > pendowner->prio)
-+ return 0;
-+ return 1;
-+}
-+
- /*
- * Try to take an rt-mutex
- *
-@@ -525,8 +579,9 @@ static int rt_mutex_adjust_prio_chain(st
- * @task: the task which wants to acquire the lock
- * @waiter: the waiter that is queued to the lock's wait list. (could be NULL)
- */
--static int try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
-- struct rt_mutex_waiter *waiter)
-+static int
-+__try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
-+ struct rt_mutex_waiter *waiter, int mode)
- {
- /*
- * We have to be careful here if the atomic speedups are
-@@ -559,12 +614,14 @@ static int try_to_take_rt_mutex(struct r
- * 3) it is top waiter
- */
- if (rt_mutex_has_waiters(lock)) {
-- if (task->prio >= rt_mutex_top_waiter(lock)->prio) {
-- if (!waiter || waiter != rt_mutex_top_waiter(lock))
-- return 0;
-- }
-+ struct task_struct *pown = rt_mutex_top_waiter(lock)->task;
-+
-+ if (task != pown && !lock_is_stealable(task, pown, mode))
-+ return 0;
- }
-
-+ /* We got the lock. */
-+
- if (waiter || rt_mutex_has_waiters(lock)) {
- unsigned long flags;
- struct rt_mutex_waiter *top;
-@@ -588,7 +645,6 @@ static int try_to_take_rt_mutex(struct r
- raw_spin_unlock_irqrestore(&task->pi_lock, flags);
- }
-
-- /* We got the lock. */
- debug_rt_mutex_lock(lock);
-
- rt_mutex_set_owner(lock, task);
-@@ -598,6 +654,13 @@ static int try_to_take_rt_mutex(struct r
- return 1;
- }
-
-+static inline int
-+try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
-+ struct rt_mutex_waiter *waiter)
-+{
-+ return __try_to_take_rt_mutex(lock, task, waiter, STEAL_NORMAL);
-+}
-+
- /*
- * Task blocks on lock.
- *
-@@ -629,6 +692,23 @@ static int task_blocks_on_rt_mutex(struc
- return -EDEADLK;
-
- raw_spin_lock_irqsave(&task->pi_lock, flags);
-+
-+ /*
-+ * In the case of futex requeue PI, this will be a proxy
-+ * lock. The task will wake unaware that it is enqueueed on
-+ * this lock. Avoid blocking on two locks and corrupting
-+ * pi_blocked_on via the PI_WAKEUP_INPROGRESS
-+ * flag. futex_wait_requeue_pi() sets this when it wakes up
-+ * before requeue (due to a signal or timeout). Do not enqueue
-+ * the task if PI_WAKEUP_INPROGRESS is set.
-+ */
-+ if (task != current && task->pi_blocked_on == PI_WAKEUP_INPROGRESS) {
-+ raw_spin_unlock_irqrestore(&task->pi_lock, flags);
-+ return -EAGAIN;
-+ }
-+
-+ BUG_ON(rt_mutex_real_waiter(task->pi_blocked_on));
-+
- __rt_mutex_adjust_prio(task);
- waiter->task = task;
- waiter->lock = lock;
-@@ -652,7 +732,7 @@ static int task_blocks_on_rt_mutex(struc
- rt_mutex_enqueue_pi(owner, waiter);
-
- __rt_mutex_adjust_prio(owner);
-- if (owner->pi_blocked_on)
-+ if (rt_mutex_real_waiter(owner->pi_blocked_on))
- chain_walk = 1;
- } else if (debug_rt_mutex_detect_deadlock(waiter, detect_deadlock)) {
- chain_walk = 1;
-@@ -729,7 +809,7 @@ static void wakeup_next_waiter(struct rt
- * long as we hold lock->wait_lock. The waiter task needs to
- * acquire it in order to dequeue the waiter.
- */
-- wake_up_process(waiter->task);
-+ rt_mutex_wake_waiter(waiter);
- }
-
- /*
-@@ -769,7 +849,8 @@ static void remove_waiter(struct rt_mute
- __rt_mutex_adjust_prio(owner);
-
- /* Store the lock on which owner is blocked or NULL */
-- next_lock = task_blocked_on_lock(owner);
-+ if (rt_mutex_real_waiter(owner->pi_blocked_on))
-+ next_lock = task_blocked_on_lock(owner);
-
- raw_spin_unlock_irqrestore(&owner->pi_lock, flags);
- }
-@@ -801,25 +882,376 @@ void rt_mutex_adjust_pi(struct task_stru
- raw_spin_lock_irqsave(&task->pi_lock, flags);
-
- waiter = task->pi_blocked_on;
-- if (!waiter || (waiter->prio == task->prio &&
-+ if (!rt_mutex_real_waiter(waiter) || (waiter->prio == task->prio &&
- !dl_prio(task->prio))) {
- raw_spin_unlock_irqrestore(&task->pi_lock, flags);
- return;
- }
- next_lock = waiter->lock;
-- raw_spin_unlock_irqrestore(&task->pi_lock, flags);
-
- /* gets dropped in rt_mutex_adjust_prio_chain()! */
- get_task_struct(task);
--
-+ raw_spin_unlock_irqrestore(&task->pi_lock, flags);
- rt_mutex_adjust_prio_chain(task, 0, NULL, next_lock, NULL, task);
- }
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+/*
-+ * preemptible spin_lock functions:
-+ */
-+static inline void rt_spin_lock_fastlock(struct rt_mutex *lock,
-+ void (*slowfn)(struct rt_mutex *lock))
-+{
-+ might_sleep();
-+
-+ if (likely(rt_mutex_cmpxchg(lock, NULL, current)))
-+ rt_mutex_deadlock_account_lock(lock, current);
-+ else
-+ slowfn(lock);
-+}
-+
-+static inline void rt_spin_lock_fastunlock(struct rt_mutex *lock,
-+ void (*slowfn)(struct rt_mutex *lock))
-+{
-+ if (likely(rt_mutex_cmpxchg(lock, current, NULL)))
-+ rt_mutex_deadlock_account_unlock(current);
-+ else
-+ slowfn(lock);
-+}
-+
-+#ifdef CONFIG_SMP
-+/*
-+ * Note that owner is a speculative pointer and dereferencing relies
-+ * on rcu_read_lock() and the check against the lock owner.
-+ */
-+static int adaptive_wait(struct rt_mutex *lock,
-+ struct task_struct *owner)
-+{
-+ int res = 0;
-+
-+ rcu_read_lock();
-+ for (;;) {
-+ if (owner != rt_mutex_owner(lock))
-+ break;
-+ /*
-+ * Ensure that owner->on_cpu is dereferenced _after_
-+ * checking the above to be valid.
-+ */
-+ barrier();
-+ if (!owner->on_cpu) {
-+ res = 1;
-+ break;
-+ }
-+ cpu_relax();
-+ }
-+ rcu_read_unlock();
-+ return res;
-+}
-+#else
-+static int adaptive_wait(struct rt_mutex *lock,
-+ struct task_struct *orig_owner)
-+{
-+ return 1;
-+}
-+#endif
-+
-+# define pi_lock(lock) raw_spin_lock_irq(lock)
-+# define pi_unlock(lock) raw_spin_unlock_irq(lock)
-+
-+/*
-+ * Slow path lock function spin_lock style: this variant is very
-+ * careful not to miss any non-lock wakeups.
-+ *
-+ * We store the current state under p->pi_lock in p->saved_state and
-+ * the try_to_wake_up() code handles this accordingly.
-+ */
-+static void noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
-+{
-+ struct task_struct *lock_owner, *self = current;
-+ struct rt_mutex_waiter waiter, *top_waiter;
-+ int ret;
-+
-+ rt_mutex_init_waiter(&waiter, true);
-+
-+ raw_spin_lock(&lock->wait_lock);
-+
-+ if (__try_to_take_rt_mutex(lock, self, NULL, STEAL_LATERAL)) {
-+ raw_spin_unlock(&lock->wait_lock);
-+ return;
-+ }
-+
-+ BUG_ON(rt_mutex_owner(lock) == self);
-+
-+ /*
-+ * We save whatever state the task is in and we'll restore it
-+ * after acquiring the lock taking real wakeups into account
-+ * as well. We are serialized via pi_lock against wakeups. See
-+ * try_to_wake_up().
-+ */
-+ pi_lock(&self->pi_lock);
-+ self->saved_state = self->state;
-+ __set_current_state(TASK_UNINTERRUPTIBLE);
-+ pi_unlock(&self->pi_lock);
-+
-+ ret = task_blocks_on_rt_mutex(lock, &waiter, self, 0);
-+ BUG_ON(ret);
-+
-+ for (;;) {
-+ /* Try to acquire the lock again. */
-+ if (__try_to_take_rt_mutex(lock, self, &waiter, STEAL_LATERAL))
-+ break;
-+
-+ top_waiter = rt_mutex_top_waiter(lock);
-+ lock_owner = rt_mutex_owner(lock);
-+
-+ raw_spin_unlock(&lock->wait_lock);
-+
-+ debug_rt_mutex_print_deadlock(&waiter);
-+
-+ if (top_waiter != &waiter || adaptive_wait(lock, lock_owner))
-+ schedule_rt_mutex(lock);
-+
-+ raw_spin_lock(&lock->wait_lock);
-+
-+ pi_lock(&self->pi_lock);
-+ __set_current_state(TASK_UNINTERRUPTIBLE);
-+ pi_unlock(&self->pi_lock);
-+ }
-+
-+ /*
-+ * Restore the task state to current->saved_state. We set it
-+ * to the original state above and the try_to_wake_up() code
-+ * has possibly updated it when a real (non-rtmutex) wakeup
-+ * happened while we were blocked. Clear saved_state so
-+ * try_to_wakeup() does not get confused.
-+ */
-+ pi_lock(&self->pi_lock);
-+ __set_current_state(self->saved_state);
-+ self->saved_state = TASK_RUNNING;
-+ pi_unlock(&self->pi_lock);
-+
-+ /*
-+ * try_to_take_rt_mutex() sets the waiter bit
-+ * unconditionally. We might have to fix that up:
-+ */
-+ fixup_rt_mutex_waiters(lock);
-+
-+ BUG_ON(rt_mutex_has_waiters(lock) && &waiter == rt_mutex_top_waiter(lock));
-+ BUG_ON(!RB_EMPTY_NODE(&waiter.tree_entry));
-+
-+ raw_spin_unlock(&lock->wait_lock);
-+
-+ debug_rt_mutex_free_waiter(&waiter);
-+}
-+
-+/*
-+ * Slow path to release a rt_mutex spin_lock style
-+ */
-+static void __sched __rt_spin_lock_slowunlock(struct rt_mutex *lock)
-+{
-+ debug_rt_mutex_unlock(lock);
-+
-+ rt_mutex_deadlock_account_unlock(current);
-+
-+ if (!rt_mutex_has_waiters(lock)) {
-+ lock->owner = NULL;
-+ raw_spin_unlock(&lock->wait_lock);
-+ return;
-+ }
-+
-+ wakeup_next_waiter(lock);
-+
-+ raw_spin_unlock(&lock->wait_lock);
-+
-+ /* Undo pi boosting.when necessary */
-+ rt_mutex_adjust_prio(current);
-+}
-+
-+static void noinline __sched rt_spin_lock_slowunlock(struct rt_mutex *lock)
-+{
-+ raw_spin_lock(&lock->wait_lock);
-+ __rt_spin_lock_slowunlock(lock);
-+}
-+
-+static void noinline __sched rt_spin_lock_slowunlock_hirq(struct rt_mutex *lock)
-+{
-+ int ret;
-+
-+ do {
-+ ret = raw_spin_trylock(&lock->wait_lock);
-+ } while (!ret);
-+
-+ __rt_spin_lock_slowunlock(lock);
-+}
-+
-+void __lockfunc rt_spin_lock(spinlock_t *lock)
-+{
-+ rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock);
-+ spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
-+}
-+EXPORT_SYMBOL(rt_spin_lock);
-+
-+void __lockfunc __rt_spin_lock(struct rt_mutex *lock)
-+{
-+ rt_spin_lock_fastlock(lock, rt_spin_lock_slowlock);
-+}
-+EXPORT_SYMBOL(__rt_spin_lock);
-+
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+void __lockfunc rt_spin_lock_nested(spinlock_t *lock, int subclass)
-+{
-+ rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock);
-+ spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
-+}
-+EXPORT_SYMBOL(rt_spin_lock_nested);
-+#endif
-+
-+void __lockfunc rt_spin_unlock(spinlock_t *lock)
-+{
-+ /* NOTE: we always pass in '1' for nested, for simplicity */
-+ spin_release(&lock->dep_map, 1, _RET_IP_);
-+ rt_spin_lock_fastunlock(&lock->lock, rt_spin_lock_slowunlock);
-+}
-+EXPORT_SYMBOL(rt_spin_unlock);
-+
-+void __lockfunc rt_spin_unlock_after_trylock_in_irq(spinlock_t *lock)
-+{
-+ /* NOTE: we always pass in '1' for nested, for simplicity */
-+ spin_release(&lock->dep_map, 1, _RET_IP_);
-+ rt_spin_lock_fastunlock(&lock->lock, rt_spin_lock_slowunlock_hirq);
-+}
-+
-+void __lockfunc __rt_spin_unlock(struct rt_mutex *lock)
-+{
-+ rt_spin_lock_fastunlock(lock, rt_spin_lock_slowunlock);
-+}
-+EXPORT_SYMBOL(__rt_spin_unlock);
-+
-+/*
-+ * Wait for the lock to get unlocked: instead of polling for an unlock
-+ * (like raw spinlocks do), we lock and unlock, to force the kernel to
-+ * schedule if there's contention:
-+ */
-+void __lockfunc rt_spin_unlock_wait(spinlock_t *lock)
-+{
-+ spin_lock(lock);
-+ spin_unlock(lock);
-+}
-+EXPORT_SYMBOL(rt_spin_unlock_wait);
-+
-+int __lockfunc __rt_spin_trylock(struct rt_mutex *lock)
-+{
-+ return rt_mutex_trylock(lock);
-+}
-+
-+int __lockfunc rt_spin_trylock(spinlock_t *lock)
-+{
-+ int ret = rt_mutex_trylock(&lock->lock);
-+
-+ if (ret)
-+ spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
-+ return ret;
-+}
-+EXPORT_SYMBOL(rt_spin_trylock);
-+
-+int __lockfunc rt_spin_trylock_bh(spinlock_t *lock)
-+{
-+ int ret;
-+
-+ local_bh_disable();
-+ ret = rt_mutex_trylock(&lock->lock);
-+ if (ret) {
-+ migrate_disable();
-+ spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
-+ } else
-+ local_bh_enable();
-+ return ret;
-+}
-+EXPORT_SYMBOL(rt_spin_trylock_bh);
-+
-+int __lockfunc rt_spin_trylock_irqsave(spinlock_t *lock, unsigned long *flags)
-+{
-+ int ret;
-+
-+ *flags = 0;
-+ ret = rt_mutex_trylock(&lock->lock);
-+ if (ret) {
-+ migrate_disable();
-+ spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
-+ }
-+ return ret;
-+}
-+EXPORT_SYMBOL(rt_spin_trylock_irqsave);
-+
-+int atomic_dec_and_spin_lock(atomic_t *atomic, spinlock_t *lock)
-+{
-+ /* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */
-+ if (atomic_add_unless(atomic, -1, 1))
-+ return 0;
-+ migrate_disable();
-+ rt_spin_lock(lock);
-+ if (atomic_dec_and_test(atomic))
-+ return 1;
-+ rt_spin_unlock(lock);
-+ migrate_enable();
-+ return 0;
-+}
-+EXPORT_SYMBOL(atomic_dec_and_spin_lock);
-+
-+void
-+__rt_spin_lock_init(spinlock_t *lock, char *name, struct lock_class_key *key)
-+{
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+ /*
-+ * Make sure we are not reinitializing a held lock:
-+ */
-+ debug_check_no_locks_freed((void *)lock, sizeof(*lock));
-+ lockdep_init_map(&lock->dep_map, name, key, 0);
-+#endif
-+}
-+EXPORT_SYMBOL(__rt_spin_lock_init);
-+
-+#endif /* PREEMPT_RT_FULL */
-+
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+static inline int __sched
-+__mutex_lock_check_stamp(struct rt_mutex *lock, struct ww_acquire_ctx *ctx)
-+{
-+ struct ww_mutex *ww = container_of(lock, struct ww_mutex, base.lock);
-+ struct ww_acquire_ctx *hold_ctx = ACCESS_ONCE(ww->ctx);
-+
-+ if (!hold_ctx)
-+ return 0;
-+
-+ if (unlikely(ctx == hold_ctx))
-+ return -EALREADY;
-+
-+ if (ctx->stamp - hold_ctx->stamp <= LONG_MAX &&
-+ (ctx->stamp != hold_ctx->stamp || ctx > hold_ctx)) {
-+#ifdef CONFIG_DEBUG_MUTEXES
-+ DEBUG_LOCKS_WARN_ON(ctx->contending_lock);
-+ ctx->contending_lock = ww;
-+#endif
-+ return -EDEADLK;
-+ }
-+
-+ return 0;
-+}
-+#else
-+static inline int __sched
-+__mutex_lock_check_stamp(struct rt_mutex *lock, struct ww_acquire_ctx *ctx)
-+{
-+ BUG();
-+ return 0;
-+}
-+
-+#endif
-+
- /**
- * __rt_mutex_slowlock() - Perform the wait-wake-try-to-take loop
- * @lock: the rt_mutex to take
- * @state: the state the task should block in (TASK_INTERRUPTIBLE
-- * or TASK_UNINTERRUPTIBLE)
-+ * or TASK_UNINTERRUPTIBLE)
- * @timeout: the pre-initialized and started timer, or NULL for none
- * @waiter: the pre-initialized rt_mutex_waiter
- *
-@@ -828,7 +1260,8 @@ void rt_mutex_adjust_pi(struct task_stru
- static int __sched
- __rt_mutex_slowlock(struct rt_mutex *lock, int state,
- struct hrtimer_sleeper *timeout,
-- struct rt_mutex_waiter *waiter)
-+ struct rt_mutex_waiter *waiter,
-+ struct ww_acquire_ctx *ww_ctx)
- {
- int ret = 0;
-
-@@ -851,6 +1284,12 @@ __rt_mutex_slowlock(struct rt_mutex *loc
- break;
- }
-
-+ if (ww_ctx && ww_ctx->acquired > 0) {
-+ ret = __mutex_lock_check_stamp(lock, ww_ctx);
-+ if (ret)
-+ break;
-+ }
-+
- raw_spin_unlock(&lock->wait_lock);
-
- debug_rt_mutex_print_deadlock(waiter);
-@@ -884,25 +1323,101 @@ static void rt_mutex_handle_deadlock(int
- }
- }
-
-+static __always_inline void ww_mutex_lock_acquired(struct ww_mutex *ww,
-+ struct ww_acquire_ctx *ww_ctx)
-+{
-+#ifdef CONFIG_DEBUG_MUTEXES
-+ /*
-+ * If this WARN_ON triggers, you used ww_mutex_lock to acquire,
-+ * but released with a normal mutex_unlock in this call.
-+ *
-+ * This should never happen, always use ww_mutex_unlock.
-+ */
-+ DEBUG_LOCKS_WARN_ON(ww->ctx);
-+
-+ /*
-+ * Not quite done after calling ww_acquire_done() ?
-+ */
-+ DEBUG_LOCKS_WARN_ON(ww_ctx->done_acquire);
-+
-+ if (ww_ctx->contending_lock) {
-+ /*
-+ * After -EDEADLK you tried to
-+ * acquire a different ww_mutex? Bad!
-+ */
-+ DEBUG_LOCKS_WARN_ON(ww_ctx->contending_lock != ww);
-+
-+ /*
-+ * You called ww_mutex_lock after receiving -EDEADLK,
-+ * but 'forgot' to unlock everything else first?
-+ */
-+ DEBUG_LOCKS_WARN_ON(ww_ctx->acquired > 0);
-+ ww_ctx->contending_lock = NULL;
-+ }
-+
-+ /*
-+ * Naughty, using a different class will lead to undefined behavior!
-+ */
-+ DEBUG_LOCKS_WARN_ON(ww_ctx->ww_class != ww->ww_class);
-+#endif
-+ ww_ctx->acquired++;
-+}
-+
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+static void ww_mutex_account_lock(struct rt_mutex *lock,
-+ struct ww_acquire_ctx *ww_ctx)
-+{
-+ struct ww_mutex *ww = container_of(lock, struct ww_mutex, base.lock);
-+ struct rt_mutex_waiter *waiter, *n;
-+
-+ /*
-+ * This branch gets optimized out for the common case,
-+ * and is only important for ww_mutex_lock.
-+ */
-+ ww_mutex_lock_acquired(ww, ww_ctx);
-+ ww->ctx = ww_ctx;
-+
-+ /*
-+ * Give any possible sleeping processes the chance to wake up,
-+ * so they can recheck if they have to back off.
-+ */
-+ rbtree_postorder_for_each_entry_safe(waiter, n, &lock->waiters,
-+ tree_entry) {
-+ /* XXX debug rt mutex waiter wakeup */
-+
-+ BUG_ON(waiter->lock != lock);
-+ rt_mutex_wake_waiter(waiter);
-+ }
-+}
-+
-+#else
-+
-+static void ww_mutex_account_lock(struct rt_mutex *lock,
-+ struct ww_acquire_ctx *ww_ctx)
-+{
-+ BUG();
-+}
-+#endif
-+
- /*
- * Slow path lock function:
- */
- static int __sched
- rt_mutex_slowlock(struct rt_mutex *lock, int state,
- struct hrtimer_sleeper *timeout,
-- int detect_deadlock)
-+ int detect_deadlock, struct ww_acquire_ctx *ww_ctx)
- {
- struct rt_mutex_waiter waiter;
- int ret = 0;
-
-- debug_rt_mutex_init_waiter(&waiter);
-- RB_CLEAR_NODE(&waiter.pi_tree_entry);
-- RB_CLEAR_NODE(&waiter.tree_entry);
-+ rt_mutex_init_waiter(&waiter, false);
-
- raw_spin_lock(&lock->wait_lock);
-
- /* Try to acquire the lock again: */
- if (try_to_take_rt_mutex(lock, current, NULL)) {
-+ if (ww_ctx)
-+ ww_mutex_account_lock(lock, ww_ctx);
- raw_spin_unlock(&lock->wait_lock);
- return 0;
- }
-@@ -919,13 +1434,15 @@ rt_mutex_slowlock(struct rt_mutex *lock,
- ret = task_blocks_on_rt_mutex(lock, &waiter, current, detect_deadlock);
-
- if (likely(!ret))
-- ret = __rt_mutex_slowlock(lock, state, timeout, &waiter);
-+ ret = __rt_mutex_slowlock(lock, state, timeout, &waiter, ww_ctx);
-
- set_current_state(TASK_RUNNING);
-
- if (unlikely(ret)) {
- remove_waiter(lock, &waiter);
- rt_mutex_handle_deadlock(ret, detect_deadlock, &waiter);
-+ } else if (ww_ctx) {
-+ ww_mutex_account_lock(lock, ww_ctx);
- }
-
- /*
-@@ -953,7 +1470,8 @@ rt_mutex_slowtrylock(struct rt_mutex *lo
- {
- int ret = 0;
-
-- raw_spin_lock(&lock->wait_lock);
-+ if (!raw_spin_trylock(&lock->wait_lock))
-+ return ret;
-
- if (likely(rt_mutex_owner(lock) != current)) {
-
-@@ -1041,30 +1559,33 @@ rt_mutex_slowunlock(struct rt_mutex *loc
- */
- static inline int
- rt_mutex_fastlock(struct rt_mutex *lock, int state,
-- int detect_deadlock,
-+ int detect_deadlock, struct ww_acquire_ctx *ww_ctx,
- int (*slowfn)(struct rt_mutex *lock, int state,
- struct hrtimer_sleeper *timeout,
-- int detect_deadlock))
-+ int detect_deadlock,
-+ struct ww_acquire_ctx *ww_ctx))
- {
- if (!detect_deadlock && likely(rt_mutex_cmpxchg(lock, NULL, current))) {
- rt_mutex_deadlock_account_lock(lock, current);
- return 0;
- } else
-- return slowfn(lock, state, NULL, detect_deadlock);
-+ return slowfn(lock, state, NULL, detect_deadlock, ww_ctx);
- }
-
- static inline int
- rt_mutex_timed_fastlock(struct rt_mutex *lock, int state,
- struct hrtimer_sleeper *timeout, int detect_deadlock,
-+ struct ww_acquire_ctx *ww_ctx,
- int (*slowfn)(struct rt_mutex *lock, int state,
- struct hrtimer_sleeper *timeout,
-- int detect_deadlock))
-+ int detect_deadlock,
-+ struct ww_acquire_ctx *ww_ctx))
- {
- if (!detect_deadlock && likely(rt_mutex_cmpxchg(lock, NULL, current))) {
- rt_mutex_deadlock_account_lock(lock, current);
- return 0;
- } else
-- return slowfn(lock, state, timeout, detect_deadlock);
-+ return slowfn(lock, state, timeout, detect_deadlock, ww_ctx);
- }
-
- static inline int
-@@ -1097,19 +1618,19 @@ void __sched rt_mutex_lock(struct rt_mut
- {
- might_sleep();
-
-- rt_mutex_fastlock(lock, TASK_UNINTERRUPTIBLE, 0, rt_mutex_slowlock);
-+ rt_mutex_fastlock(lock, TASK_UNINTERRUPTIBLE, 0, NULL, rt_mutex_slowlock);
- }
- EXPORT_SYMBOL_GPL(rt_mutex_lock);
-
- /**
- * rt_mutex_lock_interruptible - lock a rt_mutex interruptible
- *
-- * @lock: the rt_mutex to be locked
-+ * @lock: the rt_mutex to be locked
- * @detect_deadlock: deadlock detection on/off
- *
- * Returns:
-- * 0 on success
-- * -EINTR when interrupted by a signal
-+ * 0 on success
-+ * -EINTR when interrupted by a signal
- * -EDEADLK when the lock would deadlock (when deadlock detection is on)
- */
- int __sched rt_mutex_lock_interruptible(struct rt_mutex *lock,
-@@ -1118,22 +1639,43 @@ int __sched rt_mutex_lock_interruptible(
- might_sleep();
-
- return rt_mutex_fastlock(lock, TASK_INTERRUPTIBLE,
-- detect_deadlock, rt_mutex_slowlock);
-+ detect_deadlock, NULL, rt_mutex_slowlock);
- }
- EXPORT_SYMBOL_GPL(rt_mutex_lock_interruptible);
-
- /**
-+ * rt_mutex_lock_killable - lock a rt_mutex killable
-+ *
-+ * @lock: the rt_mutex to be locked
-+ * @detect_deadlock: deadlock detection on/off
-+ *
-+ * Returns:
-+ * 0 on success
-+ * -EINTR when interrupted by a signal
-+ * -EDEADLK when the lock would deadlock (when deadlock detection is on)
-+ */
-+int __sched rt_mutex_lock_killable(struct rt_mutex *lock,
-+ int detect_deadlock)
-+{
-+ might_sleep();
-+
-+ return rt_mutex_fastlock(lock, TASK_KILLABLE,
-+ detect_deadlock, NULL, rt_mutex_slowlock);
-+}
-+EXPORT_SYMBOL_GPL(rt_mutex_lock_killable);
-+
-+/**
- * rt_mutex_timed_lock - lock a rt_mutex interruptible
- * the timeout structure is provided
- * by the caller
- *
-- * @lock: the rt_mutex to be locked
-+ * @lock: the rt_mutex to be locked
- * @timeout: timeout structure or NULL (no timeout)
- * @detect_deadlock: deadlock detection on/off
- *
- * Returns:
-- * 0 on success
-- * -EINTR when interrupted by a signal
-+ * 0 on success
-+ * -EINTR when interrupted by a signal
- * -ETIMEDOUT when the timeout expired
- * -EDEADLK when the lock would deadlock (when deadlock detection is on)
- */
-@@ -1144,7 +1686,7 @@ rt_mutex_timed_lock(struct rt_mutex *loc
- might_sleep();
-
- return rt_mutex_timed_fastlock(lock, TASK_INTERRUPTIBLE, timeout,
-- detect_deadlock, rt_mutex_slowlock);
-+ detect_deadlock, NULL, rt_mutex_slowlock);
- }
- EXPORT_SYMBOL_GPL(rt_mutex_timed_lock);
-
-@@ -1202,13 +1744,12 @@ EXPORT_SYMBOL_GPL(rt_mutex_destroy);
- void __rt_mutex_init(struct rt_mutex *lock, const char *name)
- {
- lock->owner = NULL;
-- raw_spin_lock_init(&lock->wait_lock);
- lock->waiters = RB_ROOT;
- lock->waiters_leftmost = NULL;
-
- debug_rt_mutex_init(lock, name);
- }
--EXPORT_SYMBOL_GPL(__rt_mutex_init);
-+EXPORT_SYMBOL(__rt_mutex_init);
-
- /**
- * rt_mutex_init_proxy_locked - initialize and lock a rt_mutex on behalf of a
-@@ -1223,7 +1764,7 @@ EXPORT_SYMBOL_GPL(__rt_mutex_init);
- void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
- struct task_struct *proxy_owner)
- {
-- __rt_mutex_init(lock, NULL);
-+ rt_mutex_init(lock);
- debug_rt_mutex_proxy_lock(lock, proxy_owner);
- rt_mutex_set_owner(lock, proxy_owner);
- rt_mutex_deadlock_account_lock(lock, proxy_owner);
-@@ -1272,6 +1813,35 @@ int rt_mutex_start_proxy_lock(struct rt_
- return 1;
- }
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ /*
-+ * In PREEMPT_RT there's an added race.
-+ * If the task, that we are about to requeue, times out,
-+ * it can set the PI_WAKEUP_INPROGRESS. This tells the requeue
-+ * to skip this task. But right after the task sets
-+ * its pi_blocked_on to PI_WAKEUP_INPROGRESS it can then
-+ * block on the spin_lock(&hb->lock), which in RT is an rtmutex.
-+ * This will replace the PI_WAKEUP_INPROGRESS with the actual
-+ * lock that it blocks on. We *must not* place this task
-+ * on this proxy lock in that case.
-+ *
-+ * To prevent this race, we first take the task's pi_lock
-+ * and check if it has updated its pi_blocked_on. If it has,
-+ * we assume that it woke up and we return -EAGAIN.
-+ * Otherwise, we set the task's pi_blocked_on to
-+ * PI_REQUEUE_INPROGRESS, so that if the task is waking up
-+ * it will know that we are in the process of requeuing it.
-+ */
-+ raw_spin_lock_irq(&task->pi_lock);
-+ if (task->pi_blocked_on) {
-+ raw_spin_unlock_irq(&task->pi_lock);
-+ raw_spin_unlock(&lock->wait_lock);
-+ return -EAGAIN;
-+ }
-+ task->pi_blocked_on = PI_REQUEUE_INPROGRESS;
-+ raw_spin_unlock_irq(&task->pi_lock);
-+#endif
-+
- /* We enforce deadlock detection for futexes */
- ret = task_blocks_on_rt_mutex(lock, waiter, task, 1);
-
-@@ -1342,7 +1912,7 @@ int rt_mutex_finish_proxy_lock(struct rt
-
- set_current_state(TASK_INTERRUPTIBLE);
-
-- ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter);
-+ ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter, NULL);
-
- set_current_state(TASK_RUNNING);
-
-@@ -1359,3 +1929,88 @@ int rt_mutex_finish_proxy_lock(struct rt
-
- return ret;
- }
-+
-+static inline int
-+ww_mutex_deadlock_injection(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
-+{
-+#ifdef CONFIG_DEBUG_WW_MUTEX_SLOWPATH
-+ unsigned tmp;
-+
-+ if (ctx->deadlock_inject_countdown-- == 0) {
-+ tmp = ctx->deadlock_inject_interval;
-+ if (tmp > UINT_MAX/4)
-+ tmp = UINT_MAX;
-+ else
-+ tmp = tmp*2 + tmp + tmp/2;
-+
-+ ctx->deadlock_inject_interval = tmp;
-+ ctx->deadlock_inject_countdown = tmp;
-+ ctx->contending_lock = lock;
-+
-+ ww_mutex_unlock(lock);
-+
-+ return -EDEADLK;
-+ }
-+#endif
-+
-+ return 0;
-+}
-+
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+int __sched
-+__ww_mutex_lock_interruptible(struct ww_mutex *lock, struct ww_acquire_ctx *ww_ctx)
-+{
-+ int ret;
-+
-+ might_sleep();
-+
-+ mutex_acquire(&lock->base.dep_map, 0, 0, _RET_IP_);
-+ ret = rt_mutex_slowlock(&lock->base.lock, TASK_INTERRUPTIBLE, NULL, 0, ww_ctx);
-+ if (ret)
-+ mutex_release(&lock->base.dep_map, 1, _RET_IP_);
-+ else if (!ret && ww_ctx->acquired > 1)
-+ return ww_mutex_deadlock_injection(lock, ww_ctx);
-+
-+ return ret;
-+}
-+EXPORT_SYMBOL_GPL(__ww_mutex_lock_interruptible);
-+
-+int __sched
-+__ww_mutex_lock(struct ww_mutex *lock, struct ww_acquire_ctx *ww_ctx)
-+{
-+ int ret;
-+
-+ might_sleep();
-+
-+ mutex_acquire_nest(&lock->base.dep_map, 0, 0, &ww_ctx->dep_map,
-+ _RET_IP_);
-+ ret = rt_mutex_slowlock(&lock->base.lock, TASK_UNINTERRUPTIBLE, NULL, 0, ww_ctx);
-+ if (ret)
-+ mutex_release(&lock->base.dep_map, 1, _RET_IP_);
-+ else if (!ret && ww_ctx->acquired > 1)
-+ return ww_mutex_deadlock_injection(lock, ww_ctx);
-+
-+ return ret;
-+}
-+EXPORT_SYMBOL_GPL(__ww_mutex_lock);
-+
-+void __sched ww_mutex_unlock(struct ww_mutex *lock)
-+{
-+ /*
-+ * The unlocking fastpath is the 0->1 transition from 'locked'
-+ * into 'unlocked' state:
-+ */
-+ if (lock->ctx) {
-+#ifdef CONFIG_DEBUG_MUTEXES
-+ DEBUG_LOCKS_WARN_ON(!lock->ctx->acquired);
-+#endif
-+ if (lock->ctx->acquired > 0)
-+ lock->ctx->acquired--;
-+ lock->ctx = NULL;
-+ }
-+
-+ mutex_release(&lock->base.dep_map, 1, _RET_IP_);
-+ rt_mutex_unlock(&lock->base.lock);
-+}
-+EXPORT_SYMBOL(ww_mutex_unlock);
-+#endif
-Index: linux-stable/arch/sparc/kernel/setup_32.c
-===================================================================
---- linux-stable.orig/arch/sparc/kernel/setup_32.c
-+++ linux-stable/arch/sparc/kernel/setup_32.c
-@@ -309,6 +309,7 @@ void __init setup_arch(char **cmdline_p)
-
- boot_flags_init(*cmdline_p);
-
-+ early_console = &prom_early_console;
- register_console(&prom_early_console);
-
- printk("ARCH: ");
-Index: linux-stable/arch/sparc/kernel/setup_64.c
-===================================================================
---- linux-stable.orig/arch/sparc/kernel/setup_64.c
-+++ linux-stable/arch/sparc/kernel/setup_64.c
-@@ -555,6 +555,12 @@ static void __init init_sparc64_elf_hwca
- pause_patch();
- }
-
-+static inline void register_prom_console(void)
-+{
-+ early_console = &prom_early_console;
-+ register_console(&prom_early_console);
-+}
-+
- void __init setup_arch(char **cmdline_p)
- {
- /* Initialize PROM console and command line. */
-@@ -566,7 +572,7 @@ void __init setup_arch(char **cmdline_p)
- #ifdef CONFIG_EARLYFB
- if (btext_find_display())
- #endif
-- register_console(&prom_early_console);
-+ register_prom_console();
-
- if (tlb_type == hypervisor)
- printk("ARCH: SUN4V\n");
-Index: linux-stable/arch/sparc/Kconfig
-===================================================================
---- linux-stable.orig/arch/sparc/Kconfig
-+++ linux-stable/arch/sparc/Kconfig
-@@ -179,12 +179,10 @@ config NR_CPUS
- source kernel/Kconfig.hz
-
- config RWSEM_GENERIC_SPINLOCK
-- bool
-- default y if SPARC32
-+ def_bool PREEMPT_RT_FULL
-
- config RWSEM_XCHGADD_ALGORITHM
-- bool
-- default y if SPARC64
-+ def_bool !RWSEM_GENERIC_SPINLOCK && !PREEMPT_RT_FULL
-
- config GENERIC_HWEIGHT
- bool
-@@ -525,6 +523,10 @@ menu "Executable file formats"
-
- source "fs/Kconfig.binfmt"
-
-+config EARLY_PRINTK
-+ bool
-+ default y
-+
- config COMPAT
- bool
- depends on SPARC64
-Index: linux-stable/include/linux/notifier.h
-===================================================================
---- linux-stable.orig/include/linux/notifier.h
-+++ linux-stable/include/linux/notifier.h
-@@ -6,7 +6,7 @@
- *
- * Alan Cox <Alan.Cox@linux.org>
- */
--
-+
- #ifndef _LINUX_NOTIFIER_H
- #define _LINUX_NOTIFIER_H
- #include <linux/errno.h>
-@@ -42,9 +42,7 @@
- * in srcu_notifier_call_chain(): no cache bounces and no memory barriers.
- * As compensation, srcu_notifier_chain_unregister() is rather expensive.
- * SRCU notifier chains should be used when the chain will be called very
-- * often but notifier_blocks will seldom be removed. Also, SRCU notifier
-- * chains are slightly more difficult to use because they require special
-- * runtime initialization.
-+ * often but notifier_blocks will seldom be removed.
- */
-
- typedef int (*notifier_fn_t)(struct notifier_block *nb,
-@@ -88,7 +86,7 @@ struct srcu_notifier_head {
- (name)->head = NULL; \
- } while (0)
-
--/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-+/* srcu_notifier_heads must be cleaned up dynamically */
- extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
- #define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct(&(name)->srcu);
-@@ -101,7 +99,13 @@ extern void srcu_init_notifier_head(stru
- .head = NULL }
- #define RAW_NOTIFIER_INIT(name) { \
- .head = NULL }
--/* srcu_notifier_heads cannot be initialized statically */
-+
-+#define SRCU_NOTIFIER_INIT(name, pcpu) \
-+ { \
-+ .mutex = __MUTEX_INITIALIZER(name.mutex), \
-+ .head = NULL, \
-+ .srcu = __SRCU_STRUCT_INIT(name.srcu, pcpu), \
-+ }
-
- #define ATOMIC_NOTIFIER_HEAD(name) \
- struct atomic_notifier_head name = \
-@@ -113,6 +117,18 @@ extern void srcu_init_notifier_head(stru
- struct raw_notifier_head name = \
- RAW_NOTIFIER_INIT(name)
-
-+#define _SRCU_NOTIFIER_HEAD(name, mod) \
-+ static DEFINE_PER_CPU(struct srcu_struct_array, \
-+ name##_head_srcu_array); \
-+ mod struct srcu_notifier_head name = \
-+ SRCU_NOTIFIER_INIT(name, name##_head_srcu_array)
-+
-+#define SRCU_NOTIFIER_HEAD(name) \
-+ _SRCU_NOTIFIER_HEAD(name, )
-+
-+#define SRCU_NOTIFIER_HEAD_STATIC(name) \
-+ _SRCU_NOTIFIER_HEAD(name, static)
-+
- #ifdef __KERNEL__
-
- extern int atomic_notifier_chain_register(struct atomic_notifier_head *nh,
-@@ -182,12 +198,12 @@ static inline int notifier_to_errno(int
-
- /*
- * Declared notifiers so far. I can imagine quite a few more chains
-- * over time (eg laptop power reset chains, reboot chain (to clean
-+ * over time (eg laptop power reset chains, reboot chain (to clean
- * device units up), device [un]mount chain, module load/unload chain,
-- * low memory chain, screenblank chain (for plug in modular screenblankers)
-+ * low memory chain, screenblank chain (for plug in modular screenblankers)
- * VC switch chains (for loadable kernel svgalib VC switch helpers) etc...
- */
--
-+
- /* CPU notfiers are defined in include/linux/cpu.h. */
-
- /* netdevice notifiers are defined in include/linux/netdevice.h */
-Index: linux-stable/include/linux/srcu.h
-===================================================================
---- linux-stable.orig/include/linux/srcu.h
-+++ linux-stable/include/linux/srcu.h
-@@ -84,10 +84,10 @@ int init_srcu_struct(struct srcu_struct
-
- void process_srcu(struct work_struct *work);
-
--#define __SRCU_STRUCT_INIT(name) \
-+#define __SRCU_STRUCT_INIT(name, pcpu_name) \
- { \
- .completed = -300, \
-- .per_cpu_ref = &name##_srcu_array, \
-+ .per_cpu_ref = &pcpu_name, \
- .queue_lock = __SPIN_LOCK_UNLOCKED(name.queue_lock), \
- .running = false, \
- .batch_queue = RCU_BATCH_INIT(name.batch_queue), \
-@@ -104,11 +104,12 @@ void process_srcu(struct work_struct *wo
- */
- #define DEFINE_SRCU(name) \
- static DEFINE_PER_CPU(struct srcu_struct_array, name##_srcu_array);\
-- struct srcu_struct name = __SRCU_STRUCT_INIT(name);
-+ struct srcu_struct name = __SRCU_STRUCT_INIT(name, name##_srcu_array);
-
- #define DEFINE_STATIC_SRCU(name) \
- static DEFINE_PER_CPU(struct srcu_struct_array, name##_srcu_array);\
-- static struct srcu_struct name = __SRCU_STRUCT_INIT(name);
-+ static struct srcu_struct name = __SRCU_STRUCT_INIT(\
-+ name, name##_srcu_array);
-
- /**
- * call_srcu() - Queue a callback for invocation after an SRCU grace period
-Index: linux-stable/block/blk-core.c
-===================================================================
---- linux-stable.orig/block/blk-core.c
-+++ linux-stable/block/blk-core.c
-@@ -197,7 +197,7 @@ EXPORT_SYMBOL(blk_delay_queue);
- **/
- void blk_start_queue(struct request_queue *q)
- {
-- WARN_ON(!irqs_disabled());
-+ WARN_ON_NONRT(!irqs_disabled());
-
- queue_flag_clear(QUEUE_FLAG_STOPPED, q);
- __blk_run_queue(q);
-@@ -2981,7 +2981,7 @@ static void queue_unplugged(struct reque
- blk_run_queue_async(q);
- else
- __blk_run_queue(q);
-- spin_unlock(q->queue_lock);
-+ spin_unlock_irq(q->queue_lock);
- }
-
- static void flush_plug_callbacks(struct blk_plug *plug, bool from_schedule)
-@@ -3029,7 +3029,6 @@ EXPORT_SYMBOL(blk_check_plugged);
- void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
- {
- struct request_queue *q;
-- unsigned long flags;
- struct request *rq;
- LIST_HEAD(list);
- unsigned int depth;
-@@ -3051,11 +3050,6 @@ void blk_flush_plug_list(struct blk_plug
- q = NULL;
- depth = 0;
-
-- /*
-- * Save and disable interrupts here, to avoid doing it for every
-- * queue lock we have to take.
-- */
-- local_irq_save(flags);
- while (!list_empty(&list)) {
- rq = list_entry_rq(list.next);
- list_del_init(&rq->queuelist);
-@@ -3068,7 +3062,7 @@ void blk_flush_plug_list(struct blk_plug
- queue_unplugged(q, depth, from_schedule);
- q = rq->q;
- depth = 0;
-- spin_lock(q->queue_lock);
-+ spin_lock_irq(q->queue_lock);
- }
-
- /*
-@@ -3095,8 +3089,6 @@ void blk_flush_plug_list(struct blk_plug
- */
- if (q)
- queue_unplugged(q, depth, from_schedule);
--
-- local_irq_restore(flags);
- }
-
- void blk_finish_plug(struct blk_plug *plug)
-Index: linux-stable/kernel/time/jiffies.c
-===================================================================
---- linux-stable.orig/kernel/time/jiffies.c
-+++ linux-stable/kernel/time/jiffies.c
-@@ -73,7 +73,8 @@ static struct clocksource clocksource_ji
- .shift = JIFFIES_SHIFT,
- };
-
--__cacheline_aligned_in_smp DEFINE_SEQLOCK(jiffies_lock);
-+__cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(jiffies_lock);
-+__cacheline_aligned_in_smp seqcount_t jiffies_seq;
-
- #if (BITS_PER_LONG < 64)
- u64 get_jiffies_64(void)
-@@ -82,9 +83,9 @@ u64 get_jiffies_64(void)
- u64 ret;
-
- do {
-- seq = read_seqbegin(&jiffies_lock);
-+ seq = read_seqcount_begin(&jiffies_seq);
- ret = jiffies_64;
-- } while (read_seqretry(&jiffies_lock, seq));
-+ } while (read_seqcount_retry(&jiffies_seq, seq));
- return ret;
- }
- EXPORT_SYMBOL(get_jiffies_64);
-Index: linux-stable/kernel/time/tick-common.c
-===================================================================
---- linux-stable.orig/kernel/time/tick-common.c
-+++ linux-stable/kernel/time/tick-common.c
-@@ -78,13 +78,15 @@ int tick_is_oneshot_available(void)
- static void tick_periodic(int cpu)
- {
- if (tick_do_timer_cpu == cpu) {
-- write_seqlock(&jiffies_lock);
-+ raw_spin_lock(&jiffies_lock);
-+ write_seqcount_begin(&jiffies_seq);
-
- /* Keep track of the next tick event */
- tick_next_period = ktime_add(tick_next_period, tick_period);
-
- do_timer(1);
-- write_sequnlock(&jiffies_lock);
-+ write_seqcount_end(&jiffies_seq);
-+ raw_spin_unlock(&jiffies_lock);
- update_wall_time();
- }
-
-@@ -146,9 +148,9 @@ void tick_setup_periodic(struct clock_ev
- ktime_t next;
-
- do {
-- seq = read_seqbegin(&jiffies_lock);
-+ seq = read_seqcount_begin(&jiffies_seq);
- next = tick_next_period;
-- } while (read_seqretry(&jiffies_lock, seq));
-+ } while (read_seqcount_retry(&jiffies_seq, seq));
-
- clockevents_set_mode(dev, CLOCK_EVT_MODE_ONESHOT);
-
-Index: linux-stable/kernel/time/tick-internal.h
-===================================================================
---- linux-stable.orig/kernel/time/tick-internal.h
-+++ linux-stable/kernel/time/tick-internal.h
-@@ -4,7 +4,8 @@
- #include <linux/hrtimer.h>
- #include <linux/tick.h>
-
--extern seqlock_t jiffies_lock;
-+extern raw_spinlock_t jiffies_lock;
-+extern seqcount_t jiffies_seq;
-
- #define CS_NAME_LEN 32
-
-Index: linux-stable/kernel/time/tick-sched.c
-===================================================================
---- linux-stable.orig/kernel/time/tick-sched.c
-+++ linux-stable/kernel/time/tick-sched.c
-@@ -62,7 +62,8 @@ static void tick_do_update_jiffies64(kti
- return;
-
- /* Reevalute with jiffies_lock held */
-- write_seqlock(&jiffies_lock);
-+ raw_spin_lock(&jiffies_lock);
-+ write_seqcount_begin(&jiffies_seq);
-
- delta = ktime_sub(now, last_jiffies_update);
- if (delta.tv64 >= tick_period.tv64) {
-@@ -85,10 +86,12 @@ static void tick_do_update_jiffies64(kti
- /* Keep the tick_next_period variable up to date */
- tick_next_period = ktime_add(last_jiffies_update, tick_period);
- } else {
-- write_sequnlock(&jiffies_lock);
-+ write_seqcount_end(&jiffies_seq);
-+ raw_spin_unlock(&jiffies_lock);
- return;
- }
-- write_sequnlock(&jiffies_lock);
-+ write_seqcount_end(&jiffies_seq);
-+ raw_spin_unlock(&jiffies_lock);
- update_wall_time();
- }
-
-@@ -99,12 +102,14 @@ static ktime_t tick_init_jiffy_update(vo
- {
- ktime_t period;
-
-- write_seqlock(&jiffies_lock);
-+ raw_spin_lock(&jiffies_lock);
-+ write_seqcount_begin(&jiffies_seq);
- /* Did we start the jiffies update yet ? */
- if (last_jiffies_update.tv64 == 0)
- last_jiffies_update = tick_next_period;
- period = last_jiffies_update;
-- write_sequnlock(&jiffies_lock);
-+ write_seqcount_end(&jiffies_seq);
-+ raw_spin_unlock(&jiffies_lock);
- return period;
- }
-
-@@ -221,6 +226,7 @@ static void nohz_full_kick_work_func(str
-
- static DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) = {
- .func = nohz_full_kick_work_func,
-+ .flags = IRQ_WORK_HARD_IRQ,
- };
-
- /*
-@@ -540,10 +546,10 @@ static ktime_t tick_nohz_stop_sched_tick
-
- /* Read jiffies and the time when jiffies were updated last */
- do {
-- seq = read_seqbegin(&jiffies_lock);
-+ seq = read_seqcount_begin(&jiffies_seq);
- last_update = last_jiffies_update;
- last_jiffies = jiffies;
-- } while (read_seqretry(&jiffies_lock, seq));
-+ } while (read_seqcount_retry(&jiffies_seq, seq));
-
- if (rcu_needs_cpu(cpu, &rcu_delta_jiffies) ||
- arch_needs_cpu(cpu) || irq_work_needs_cpu()) {
-@@ -721,14 +727,7 @@ static bool can_stop_idle_tick(int cpu,
- return false;
-
- if (unlikely(local_softirq_pending() && cpu_online(cpu))) {
-- static int ratelimit;
--
-- if (ratelimit < 10 &&
-- (local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK)) {
-- pr_warn("NOHZ: local_softirq_pending %02x\n",
-- (unsigned int) local_softirq_pending());
-- ratelimit++;
-- }
-+ softirq_check_pending_idle();
- return false;
- }
-
-@@ -1110,6 +1109,7 @@ void tick_setup_sched_timer(void)
- * Emulate tick processing via per-CPU hrtimers:
- */
- hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
-+ ts->sched_timer.irqsafe = 1;
- ts->sched_timer.function = tick_sched_timer;
-
- /* Get the next period (per cpu) */
-Index: linux-stable/kernel/time/timekeeping.c
-===================================================================
---- linux-stable.orig/kernel/time/timekeeping.c
-+++ linux-stable/kernel/time/timekeeping.c
-@@ -1735,8 +1735,10 @@ EXPORT_SYMBOL(hardpps);
- */
- void xtime_update(unsigned long ticks)
- {
-- write_seqlock(&jiffies_lock);
-+ raw_spin_lock(&jiffies_lock);
-+ write_seqcount_begin(&jiffies_seq);
- do_timer(ticks);
-- write_sequnlock(&jiffies_lock);
-+ write_seqcount_end(&jiffies_seq);
-+ raw_spin_unlock(&jiffies_lock);
- update_wall_time();
- }
-Index: linux-stable/include/linux/init_task.h
-===================================================================
---- linux-stable.orig/include/linux/init_task.h
-+++ linux-stable/include/linux/init_task.h
-@@ -145,9 +145,16 @@ extern struct task_group root_task_group
- # define INIT_PERF_EVENTS(tsk)
- #endif
-
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+# define INIT_TIMER_LIST .posix_timer_list = NULL,
-+#else
-+# define INIT_TIMER_LIST
-+#endif
-+
- #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
- # define INIT_VTIME(tsk) \
-- .vtime_seqlock = __SEQLOCK_UNLOCKED(tsk.vtime_seqlock), \
-+ .vtime_lock = __RAW_SPIN_LOCK_UNLOCKED(tsk.vtime_lock), \
-+ .vtime_seq = SEQCNT_ZERO(tsk.vtime_seq), \
- .vtime_snap = 0, \
- .vtime_snap_whence = VTIME_SYS,
- #else
-@@ -217,6 +224,7 @@ extern struct task_group root_task_group
- .cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers), \
- .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock), \
- .timer_slack_ns = 50000, /* 50 usec default slack */ \
-+ INIT_TIMER_LIST \
- .pids = { \
- [PIDTYPE_PID] = INIT_PID_LINK(PIDTYPE_PID), \
- [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID), \
-Index: linux-stable/kernel/sched/cputime.c
-===================================================================
---- linux-stable.orig/kernel/sched/cputime.c
-+++ linux-stable/kernel/sched/cputime.c
-@@ -655,37 +655,45 @@ static void __vtime_account_system(struc
-
- void vtime_account_system(struct task_struct *tsk)
- {
-- write_seqlock(&tsk->vtime_seqlock);
-+ raw_spin_lock(&tsk->vtime_lock);
-+ write_seqcount_begin(&tsk->vtime_seq);
- __vtime_account_system(tsk);
-- write_sequnlock(&tsk->vtime_seqlock);
-+ write_seqcount_end(&tsk->vtime_seq);
-+ raw_spin_unlock(&tsk->vtime_lock);
- }
-
- void vtime_gen_account_irq_exit(struct task_struct *tsk)
- {
-- write_seqlock(&tsk->vtime_seqlock);
-+ raw_spin_lock(&tsk->vtime_lock);
-+ write_seqcount_begin(&tsk->vtime_seq);
- __vtime_account_system(tsk);
- if (context_tracking_in_user())
- tsk->vtime_snap_whence = VTIME_USER;
-- write_sequnlock(&tsk->vtime_seqlock);
-+ write_seqcount_end(&tsk->vtime_seq);
-+ raw_spin_unlock(&tsk->vtime_lock);
- }
-
- void vtime_account_user(struct task_struct *tsk)
- {
- cputime_t delta_cpu;
-
-- write_seqlock(&tsk->vtime_seqlock);
-+ raw_spin_lock(&tsk->vtime_lock);
-+ write_seqcount_begin(&tsk->vtime_seq);
- delta_cpu = get_vtime_delta(tsk);
- tsk->vtime_snap_whence = VTIME_SYS;
- account_user_time(tsk, delta_cpu, cputime_to_scaled(delta_cpu));
-- write_sequnlock(&tsk->vtime_seqlock);
-+ write_seqcount_end(&tsk->vtime_seq);
-+ raw_spin_unlock(&tsk->vtime_lock);
- }
-
- void vtime_user_enter(struct task_struct *tsk)
- {
-- write_seqlock(&tsk->vtime_seqlock);
-+ raw_spin_lock(&tsk->vtime_lock);
-+ write_seqcount_begin(&tsk->vtime_seq);
- __vtime_account_system(tsk);
- tsk->vtime_snap_whence = VTIME_USER;
-- write_sequnlock(&tsk->vtime_seqlock);
-+ write_seqcount_end(&tsk->vtime_seq);
-+ raw_spin_unlock(&tsk->vtime_lock);
- }
-
- void vtime_guest_enter(struct task_struct *tsk)
-@@ -697,19 +705,23 @@ void vtime_guest_enter(struct task_struc
- * synchronization against the reader (task_gtime())
- * that can thus safely catch up with a tickless delta.
- */
-- write_seqlock(&tsk->vtime_seqlock);
-+ raw_spin_lock(&tsk->vtime_lock);
-+ write_seqcount_begin(&tsk->vtime_seq);
- __vtime_account_system(tsk);
- current->flags |= PF_VCPU;
-- write_sequnlock(&tsk->vtime_seqlock);
-+ write_seqcount_end(&tsk->vtime_seq);
-+ raw_spin_unlock(&tsk->vtime_lock);
- }
- EXPORT_SYMBOL_GPL(vtime_guest_enter);
-
- void vtime_guest_exit(struct task_struct *tsk)
- {
-- write_seqlock(&tsk->vtime_seqlock);
-+ raw_spin_lock(&tsk->vtime_lock);
-+ write_seqcount_begin(&tsk->vtime_seq);
- __vtime_account_system(tsk);
- current->flags &= ~PF_VCPU;
-- write_sequnlock(&tsk->vtime_seqlock);
-+ write_seqcount_end(&tsk->vtime_seq);
-+ raw_spin_unlock(&tsk->vtime_lock);
- }
- EXPORT_SYMBOL_GPL(vtime_guest_exit);
-
-@@ -722,24 +734,30 @@ void vtime_account_idle(struct task_stru
-
- void arch_vtime_task_switch(struct task_struct *prev)
- {
-- write_seqlock(&prev->vtime_seqlock);
-+ raw_spin_lock(&prev->vtime_lock);
-+ write_seqcount_begin(&prev->vtime_seq);
- prev->vtime_snap_whence = VTIME_SLEEPING;
-- write_sequnlock(&prev->vtime_seqlock);
-+ write_seqcount_end(&prev->vtime_seq);
-+ raw_spin_unlock(&prev->vtime_lock);
-
-- write_seqlock(&current->vtime_seqlock);
-+ raw_spin_lock(&current->vtime_lock);
-+ write_seqcount_begin(&current->vtime_seq);
- current->vtime_snap_whence = VTIME_SYS;
- current->vtime_snap = sched_clock_cpu(smp_processor_id());
-- write_sequnlock(&current->vtime_seqlock);
-+ write_seqcount_end(&current->vtime_seq);
-+ raw_spin_unlock(&current->vtime_lock);
- }
-
- void vtime_init_idle(struct task_struct *t, int cpu)
- {
- unsigned long flags;
-
-- write_seqlock_irqsave(&t->vtime_seqlock, flags);
-+ raw_spin_lock_irqsave(&t->vtime_lock, flags);
-+ write_seqcount_begin(&t->vtime_seq);
- t->vtime_snap_whence = VTIME_SYS;
- t->vtime_snap = sched_clock_cpu(cpu);
-- write_sequnlock_irqrestore(&t->vtime_seqlock, flags);
-+ write_seqcount_end(&t->vtime_seq);
-+ raw_spin_unlock_irqrestore(&t->vtime_lock, flags);
- }
-
- cputime_t task_gtime(struct task_struct *t)
-@@ -748,13 +766,13 @@ cputime_t task_gtime(struct task_struct
- cputime_t gtime;
-
- do {
-- seq = read_seqbegin(&t->vtime_seqlock);
-+ seq = read_seqcount_begin(&t->vtime_seq);
-
- gtime = t->gtime;
- if (t->flags & PF_VCPU)
- gtime += vtime_delta(t);
-
-- } while (read_seqretry(&t->vtime_seqlock, seq));
-+ } while (read_seqcount_retry(&t->vtime_seq, seq));
-
- return gtime;
- }
-@@ -777,7 +795,7 @@ fetch_task_cputime(struct task_struct *t
- *udelta = 0;
- *sdelta = 0;
-
-- seq = read_seqbegin(&t->vtime_seqlock);
-+ seq = read_seqcount_begin(&t->vtime_seq);
-
- if (u_dst)
- *u_dst = *u_src;
-@@ -801,7 +819,7 @@ fetch_task_cputime(struct task_struct *t
- if (t->vtime_snap_whence == VTIME_SYS)
- *sdelta = delta;
- }
-- } while (read_seqretry(&t->vtime_seqlock, seq));
-+ } while (read_seqcount_retry(&t->vtime_seq, seq));
- }
-
-
-Index: linux-stable/arch/mips/kernel/signal.c
-===================================================================
---- linux-stable.orig/arch/mips/kernel/signal.c
-+++ linux-stable/arch/mips/kernel/signal.c
-@@ -575,6 +575,7 @@ asmlinkage void do_notify_resume(struct
- __u32 thread_info_flags)
- {
- local_irq_enable();
-+ preempt_check_resched();
-
- user_exit();
-
-Index: linux-stable/kernel/signal.c
-===================================================================
---- linux-stable.orig/kernel/signal.c
-+++ linux-stable/kernel/signal.c
-@@ -14,6 +14,7 @@
- #include <linux/export.h>
- #include <linux/init.h>
- #include <linux/sched.h>
-+#include <linux/sched/rt.h>
- #include <linux/fs.h>
- #include <linux/tty.h>
- #include <linux/binfmts.h>
-@@ -349,13 +350,45 @@ static bool task_participate_group_stop(
- return false;
- }
-
-+#ifdef __HAVE_ARCH_CMPXCHG
-+static inline struct sigqueue *get_task_cache(struct task_struct *t)
-+{
-+ struct sigqueue *q = t->sigqueue_cache;
-+
-+ if (cmpxchg(&t->sigqueue_cache, q, NULL) != q)
-+ return NULL;
-+ return q;
-+}
-+
-+static inline int put_task_cache(struct task_struct *t, struct sigqueue *q)
-+{
-+ if (cmpxchg(&t->sigqueue_cache, NULL, q) == NULL)
-+ return 0;
-+ return 1;
-+}
-+
-+#else
-+
-+static inline struct sigqueue *get_task_cache(struct task_struct *t)
-+{
-+ return NULL;
-+}
-+
-+static inline int put_task_cache(struct task_struct *t, struct sigqueue *q)
-+{
-+ return 1;
-+}
-+
-+#endif
-+
- /*
- * allocate a new signal queue record
- * - this may be called without locks if and only if t == current, otherwise an
- * appropriate lock must be held to stop the target task from exiting
- */
- static struct sigqueue *
--__sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimit)
-+__sigqueue_do_alloc(int sig, struct task_struct *t, gfp_t flags,
-+ int override_rlimit, int fromslab)
- {
- struct sigqueue *q = NULL;
- struct user_struct *user;
-@@ -372,7 +405,10 @@ __sigqueue_alloc(int sig, struct task_st
- if (override_rlimit ||
- atomic_read(&user->sigpending) <=
- task_rlimit(t, RLIMIT_SIGPENDING)) {
-- q = kmem_cache_alloc(sigqueue_cachep, flags);
-+ if (!fromslab)
-+ q = get_task_cache(t);
-+ if (!q)
-+ q = kmem_cache_alloc(sigqueue_cachep, flags);
- } else {
- print_dropped_signal(sig);
- }
-@@ -389,6 +425,13 @@ __sigqueue_alloc(int sig, struct task_st
- return q;
- }
-
-+static struct sigqueue *
-+__sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags,
-+ int override_rlimit)
-+{
-+ return __sigqueue_do_alloc(sig, t, flags, override_rlimit, 0);
-+}
-+
- static void __sigqueue_free(struct sigqueue *q)
- {
- if (q->flags & SIGQUEUE_PREALLOC)
-@@ -398,6 +441,21 @@ static void __sigqueue_free(struct sigqu
- kmem_cache_free(sigqueue_cachep, q);
- }
-
-+static void sigqueue_free_current(struct sigqueue *q)
-+{
-+ struct user_struct *up;
-+
-+ if (q->flags & SIGQUEUE_PREALLOC)
-+ return;
-+
-+ up = q->user;
-+ if (rt_prio(current->normal_prio) && !put_task_cache(current, q)) {
-+ atomic_dec(&up->sigpending);
-+ free_uid(up);
-+ } else
-+ __sigqueue_free(q);
-+}
-+
- void flush_sigqueue(struct sigpending *queue)
- {
- struct sigqueue *q;
-@@ -411,6 +469,21 @@ void flush_sigqueue(struct sigpending *q
- }
-
- /*
-+ * Called from __exit_signal. Flush tsk->pending and
-+ * tsk->sigqueue_cache
-+ */
-+void flush_task_sigqueue(struct task_struct *tsk)
-+{
-+ struct sigqueue *q;
-+
-+ flush_sigqueue(&tsk->pending);
-+
-+ q = get_task_cache(tsk);
-+ if (q)
-+ kmem_cache_free(sigqueue_cachep, q);
-+}
-+
-+/*
- * Flush all pending signals for a task.
- */
- void __flush_signals(struct task_struct *t)
-@@ -562,7 +635,7 @@ static void collect_signal(int sig, stru
- still_pending:
- list_del_init(&first->list);
- copy_siginfo(info, &first->info);
-- __sigqueue_free(first);
-+ sigqueue_free_current(first);
- } else {
- /*
- * Ok, it wasn't in the queue. This must be
-@@ -608,6 +681,8 @@ int dequeue_signal(struct task_struct *t
- {
- int signr;
-
-+ WARN_ON_ONCE(tsk != current);
-+
- /* We only dequeue private signals from ourselves, we don't let
- * signalfd steal them
- */
-@@ -1230,8 +1305,8 @@ int do_send_sig_info(int sig, struct sig
- * We don't want to have recursive SIGSEGV's etc, for example,
- * that is why we also clear SIGNAL_UNKILLABLE.
- */
--int
--force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
-+static int
-+do_force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
- {
- unsigned long int flags;
- int ret, blocked, ignored;
-@@ -1256,6 +1331,39 @@ force_sig_info(int sig, struct siginfo *
- return ret;
- }
-
-+int force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
-+{
-+/*
-+ * On some archs, PREEMPT_RT has to delay sending a signal from a trap
-+ * since it can not enable preemption, and the signal code's spin_locks
-+ * turn into mutexes. Instead, it must set TIF_NOTIFY_RESUME which will
-+ * send the signal on exit of the trap.
-+ */
-+#ifdef ARCH_RT_DELAYS_SIGNAL_SEND
-+ if (in_atomic()) {
-+ if (WARN_ON_ONCE(t != current))
-+ return 0;
-+ if (WARN_ON_ONCE(t->forced_info.si_signo))
-+ return 0;
-+
-+ if (is_si_special(info)) {
-+ WARN_ON_ONCE(info != SEND_SIG_PRIV);
-+ t->forced_info.si_signo = sig;
-+ t->forced_info.si_errno = 0;
-+ t->forced_info.si_code = SI_KERNEL;
-+ t->forced_info.si_pid = 0;
-+ t->forced_info.si_uid = 0;
-+ } else {
-+ t->forced_info = *info;
-+ }
-+
-+ set_tsk_thread_flag(t, TIF_NOTIFY_RESUME);
-+ return 0;
-+ }
-+#endif
-+ return do_force_sig_info(sig, info, t);
-+}
-+
- /*
- * Nuke all other threads in the group.
- */
-@@ -1286,12 +1394,12 @@ struct sighand_struct *__lock_task_sigha
- struct sighand_struct *sighand;
-
- for (;;) {
-- local_irq_save(*flags);
-+ local_irq_save_nort(*flags);
- rcu_read_lock();
- sighand = rcu_dereference(tsk->sighand);
- if (unlikely(sighand == NULL)) {
- rcu_read_unlock();
-- local_irq_restore(*flags);
-+ local_irq_restore_nort(*flags);
- break;
- }
-
-@@ -1302,7 +1410,7 @@ struct sighand_struct *__lock_task_sigha
- }
- spin_unlock(&sighand->siglock);
- rcu_read_unlock();
-- local_irq_restore(*flags);
-+ local_irq_restore_nort(*flags);
- }
-
- return sighand;
-@@ -1547,7 +1655,8 @@ EXPORT_SYMBOL(kill_pid);
- */
- struct sigqueue *sigqueue_alloc(void)
- {
-- struct sigqueue *q = __sigqueue_alloc(-1, current, GFP_KERNEL, 0);
-+ /* Preallocated sigqueue objects always from the slabcache ! */
-+ struct sigqueue *q = __sigqueue_do_alloc(-1, current, GFP_KERNEL, 0, 1);
-
- if (q)
- q->flags |= SIGQUEUE_PREALLOC;
-@@ -1908,15 +2017,7 @@ static void ptrace_stop(int exit_code, i
- if (gstop_done && ptrace_reparented(current))
- do_notify_parent_cldstop(current, false, why);
-
-- /*
-- * Don't want to allow preemption here, because
-- * sys_ptrace() needs this task to be inactive.
-- *
-- * XXX: implement read_unlock_no_resched().
-- */
-- preempt_disable();
- read_unlock(&tasklist_lock);
-- preempt_enable_no_resched();
- freezable_schedule();
- } else {
- /*
-Index: linux-stable/kernel/ptrace.c
-===================================================================
---- linux-stable.orig/kernel/ptrace.c
-+++ linux-stable/kernel/ptrace.c
-@@ -135,7 +135,12 @@ static bool ptrace_freeze_traced(struct
-
- spin_lock_irq(&task->sighand->siglock);
- if (task_is_traced(task) && !__fatal_signal_pending(task)) {
-- task->state = __TASK_TRACED;
-+ raw_spin_lock_irq(&task->pi_lock);
-+ if (task->state & __TASK_TRACED)
-+ task->state = __TASK_TRACED;
-+ else
-+ task->saved_state = __TASK_TRACED;
-+ raw_spin_unlock_irq(&task->pi_lock);
- ret = true;
- }
- spin_unlock_irq(&task->sighand->siglock);
-Index: linux-stable/arch/arm/mach-exynos/platsmp.c
-===================================================================
---- linux-stable.orig/arch/arm/mach-exynos/platsmp.c
-+++ linux-stable/arch/arm/mach-exynos/platsmp.c
-@@ -71,7 +71,7 @@ static void __iomem *scu_base_addr(void)
- return (void __iomem *)(S5P_VA_SCU);
- }
-
--static DEFINE_SPINLOCK(boot_lock);
-+static DEFINE_RAW_SPINLOCK(boot_lock);
-
- static void exynos_secondary_init(unsigned int cpu)
- {
-@@ -84,8 +84,8 @@ static void exynos_secondary_init(unsign
- /*
- * Synchronise with the boot thread.
- */
-- spin_lock(&boot_lock);
-- spin_unlock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
- }
-
- static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle)
-@@ -97,7 +97,7 @@ static int exynos_boot_secondary(unsigne
- * Set synchronisation state between this boot processor
- * and the secondary one
- */
-- spin_lock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-
- /*
- * The secondary processor is waiting to be released from
-@@ -126,7 +126,7 @@ static int exynos_boot_secondary(unsigne
-
- if (timeout == 0) {
- printk(KERN_ERR "cpu1 power enable failed");
-- spin_unlock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
- return -ETIMEDOUT;
- }
- }
-@@ -165,7 +165,7 @@ static int exynos_boot_secondary(unsigne
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
-- spin_unlock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
-
- return pen_release != -1 ? -ENOSYS : 0;
- }
-Index: linux-stable/arch/arm/mach-msm/platsmp.c
-===================================================================
---- linux-stable.orig/arch/arm/mach-msm/platsmp.c
-+++ linux-stable/arch/arm/mach-msm/platsmp.c
-@@ -30,7 +30,7 @@
-
- extern void msm_secondary_startup(void);
-
--static DEFINE_SPINLOCK(boot_lock);
-+static DEFINE_RAW_SPINLOCK(boot_lock);
-
- static inline int get_core_count(void)
- {
-@@ -50,8 +50,8 @@ static void msm_secondary_init(unsigned
- /*
- * Synchronise with the boot thread.
- */
-- spin_lock(&boot_lock);
-- spin_unlock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
- }
-
- static void prepare_cold_cpu(unsigned int cpu)
-@@ -88,7 +88,7 @@ static int msm_boot_secondary(unsigned i
- * set synchronisation state between this boot processor
- * and the secondary one
- */
-- spin_lock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-
- /*
- * The secondary processor is waiting to be released from
-@@ -121,7 +121,7 @@ static int msm_boot_secondary(unsigned i
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
-- spin_unlock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
-
- return pen_release != -1 ? -ENOSYS : 0;
- }
-Index: linux-stable/arch/arm/mach-omap2/omap-smp.c
-===================================================================
---- linux-stable.orig/arch/arm/mach-omap2/omap-smp.c
-+++ linux-stable/arch/arm/mach-omap2/omap-smp.c
-@@ -42,7 +42,7 @@
- /* SCU base address */
- static void __iomem *scu_base;
-
--static DEFINE_SPINLOCK(boot_lock);
-+static DEFINE_RAW_SPINLOCK(boot_lock);
-
- void __iomem *omap4_get_scu_base(void)
- {
-@@ -73,8 +73,8 @@ static void omap4_secondary_init(unsigne
- /*
- * Synchronise with the boot thread.
- */
-- spin_lock(&boot_lock);
-- spin_unlock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
- }
-
- static int omap4_boot_secondary(unsigned int cpu, struct task_struct *idle)
-@@ -88,7 +88,7 @@ static int omap4_boot_secondary(unsigned
- * Set synchronisation state between this boot processor
- * and the secondary one
- */
-- spin_lock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-
- /*
- * Update the AuxCoreBoot0 with boot state for secondary core.
-@@ -165,7 +165,7 @@ static int omap4_boot_secondary(unsigned
- * Now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
-- spin_unlock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
-
- return 0;
- }
-Index: linux-stable/arch/arm/mach-prima2/platsmp.c
-===================================================================
---- linux-stable.orig/arch/arm/mach-prima2/platsmp.c
-+++ linux-stable/arch/arm/mach-prima2/platsmp.c
-@@ -23,7 +23,7 @@
- static void __iomem *scu_base;
- static void __iomem *rsc_base;
-
--static DEFINE_SPINLOCK(boot_lock);
-+static DEFINE_RAW_SPINLOCK(boot_lock);
-
- static struct map_desc scu_io_desc __initdata = {
- .length = SZ_4K,
-@@ -56,8 +56,8 @@ static void sirfsoc_secondary_init(unsig
- /*
- * Synchronise with the boot thread.
- */
-- spin_lock(&boot_lock);
-- spin_unlock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
- }
-
- static struct of_device_id rsc_ids[] = {
-@@ -95,7 +95,7 @@ static int sirfsoc_boot_secondary(unsign
- /* make sure write buffer is drained */
- mb();
-
-- spin_lock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-
- /*
- * The secondary processor is waiting to be released from
-@@ -127,7 +127,7 @@ static int sirfsoc_boot_secondary(unsign
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
-- spin_unlock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
-
- return pen_release != -1 ? -ENOSYS : 0;
- }
-Index: linux-stable/arch/arm/mach-spear/platsmp.c
-===================================================================
---- linux-stable.orig/arch/arm/mach-spear/platsmp.c
-+++ linux-stable/arch/arm/mach-spear/platsmp.c
-@@ -20,7 +20,7 @@
- #include <mach/spear.h>
- #include "generic.h"
-
--static DEFINE_SPINLOCK(boot_lock);
-+static DEFINE_RAW_SPINLOCK(boot_lock);
-
- static void __iomem *scu_base = IOMEM(VA_SCU_BASE);
-
-@@ -36,8 +36,8 @@ static void spear13xx_secondary_init(uns
- /*
- * Synchronise with the boot thread.
- */
-- spin_lock(&boot_lock);
-- spin_unlock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
- }
-
- static int spear13xx_boot_secondary(unsigned int cpu, struct task_struct *idle)
-@@ -48,7 +48,7 @@ static int spear13xx_boot_secondary(unsi
- * set synchronisation state between this boot processor
- * and the secondary one
- */
-- spin_lock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-
- /*
- * The secondary processor is waiting to be released from
-@@ -75,7 +75,7 @@ static int spear13xx_boot_secondary(unsi
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
-- spin_unlock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
-
- return pen_release != -1 ? -ENOSYS : 0;
- }
-Index: linux-stable/arch/arm/mach-sti/platsmp.c
-===================================================================
---- linux-stable.orig/arch/arm/mach-sti/platsmp.c
-+++ linux-stable/arch/arm/mach-sti/platsmp.c
-@@ -34,7 +34,7 @@ static void write_pen_release(int val)
- sync_cache_w(&pen_release);
- }
-
--static DEFINE_SPINLOCK(boot_lock);
-+static DEFINE_RAW_SPINLOCK(boot_lock);
-
- void sti_secondary_init(unsigned int cpu)
- {
-@@ -49,8 +49,8 @@ void sti_secondary_init(unsigned int cpu
- /*
- * Synchronise with the boot thread.
- */
-- spin_lock(&boot_lock);
-- spin_unlock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
- }
-
- int sti_boot_secondary(unsigned int cpu, struct task_struct *idle)
-@@ -61,7 +61,7 @@ int sti_boot_secondary(unsigned int cpu,
- * set synchronisation state between this boot processor
- * and the secondary one
- */
-- spin_lock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-
- /*
- * The secondary processor is waiting to be released from
-@@ -92,7 +92,7 @@ int sti_boot_secondary(unsigned int cpu,
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
-- spin_unlock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
-
- return pen_release != -1 ? -ENOSYS : 0;
- }
-Index: linux-stable/arch/arm/mach-ux500/platsmp.c
-===================================================================
---- linux-stable.orig/arch/arm/mach-ux500/platsmp.c
-+++ linux-stable/arch/arm/mach-ux500/platsmp.c
-@@ -51,7 +51,7 @@ static void __iomem *scu_base_addr(void)
- return NULL;
- }
-
--static DEFINE_SPINLOCK(boot_lock);
-+static DEFINE_RAW_SPINLOCK(boot_lock);
-
- static void ux500_secondary_init(unsigned int cpu)
- {
-@@ -64,8 +64,8 @@ static void ux500_secondary_init(unsigne
- /*
- * Synchronise with the boot thread.
- */
-- spin_lock(&boot_lock);
-- spin_unlock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
- }
-
- static int ux500_boot_secondary(unsigned int cpu, struct task_struct *idle)
-@@ -76,7 +76,7 @@ static int ux500_boot_secondary(unsigned
- * set synchronisation state between this boot processor
- * and the secondary one
- */
-- spin_lock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-
- /*
- * The secondary processor is waiting to be released from
-@@ -97,7 +97,7 @@ static int ux500_boot_secondary(unsigned
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
-- spin_unlock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
-
- return pen_release != -1 ? -ENOSYS : 0;
- }
-Index: linux-stable/arch/arm/plat-versatile/platsmp.c
-===================================================================
---- linux-stable.orig/arch/arm/plat-versatile/platsmp.c
-+++ linux-stable/arch/arm/plat-versatile/platsmp.c
-@@ -30,7 +30,7 @@ static void write_pen_release(int val)
- sync_cache_w(&pen_release);
- }
-
--static DEFINE_SPINLOCK(boot_lock);
-+static DEFINE_RAW_SPINLOCK(boot_lock);
-
- void versatile_secondary_init(unsigned int cpu)
- {
-@@ -43,8 +43,8 @@ void versatile_secondary_init(unsigned i
- /*
- * Synchronise with the boot thread.
- */
-- spin_lock(&boot_lock);
-- spin_unlock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
- }
-
- int versatile_boot_secondary(unsigned int cpu, struct task_struct *idle)
-@@ -55,7 +55,7 @@ int versatile_boot_secondary(unsigned in
- * Set synchronisation state between this boot processor
- * and the secondary one
- */
-- spin_lock(&boot_lock);
-+ raw_spin_lock(&boot_lock);
-
- /*
- * This is really belt and braces; we hold unintended secondary
-@@ -85,7 +85,7 @@ int versatile_boot_secondary(unsigned in
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
-- spin_unlock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
-
- return pen_release != -1 ? -ENOSYS : 0;
- }
-Index: linux-stable/kernel/posix-timers.c
-===================================================================
---- linux-stable.orig/kernel/posix-timers.c
-+++ linux-stable/kernel/posix-timers.c
-@@ -497,6 +497,7 @@ static enum hrtimer_restart posix_timer_
- static struct pid *good_sigevent(sigevent_t * event)
- {
- struct task_struct *rtn = current->group_leader;
-+ int sig = event->sigev_signo;
-
- if ((event->sigev_notify & SIGEV_THREAD_ID ) &&
- (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) ||
-@@ -505,7 +506,8 @@ static struct pid *good_sigevent(sigeven
- return NULL;
-
- if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) &&
-- ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX)))
-+ (sig <= 0 || sig > SIGRTMAX || sig_kernel_only(sig) ||
-+ sig_kernel_coredump(sig)))
- return NULL;
-
- return task_pid(rtn);
-@@ -816,6 +818,20 @@ SYSCALL_DEFINE1(timer_getoverrun, timer_
- return overrun;
- }
-
-+/*
-+ * Protected by RCU!
-+ */
-+static void timer_wait_for_callback(struct k_clock *kc, struct k_itimer *timr)
-+{
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ if (kc->timer_set == common_timer_set)
-+ hrtimer_wait_for_timer(&timr->it.real.timer);
-+ else
-+ /* FIXME: Whacky hack for posix-cpu-timers */
-+ schedule_timeout(1);
-+#endif
-+}
-+
- /* Set a POSIX.1b interval timer. */
- /* timr->it_lock is taken. */
- static int
-@@ -893,6 +909,7 @@ retry:
- if (!timr)
- return -EINVAL;
-
-+ rcu_read_lock();
- kc = clockid_to_kclock(timr->it_clock);
- if (WARN_ON_ONCE(!kc || !kc->timer_set))
- error = -EINVAL;
-@@ -901,9 +918,12 @@ retry:
-
- unlock_timer(timr, flag);
- if (error == TIMER_RETRY) {
-+ timer_wait_for_callback(kc, timr);
- rtn = NULL; // We already got the old time...
-+ rcu_read_unlock();
- goto retry;
- }
-+ rcu_read_unlock();
-
- if (old_setting && !error &&
- copy_to_user(old_setting, &old_spec, sizeof (old_spec)))
-@@ -941,10 +961,15 @@ retry_delete:
- if (!timer)
- return -EINVAL;
-
-+ rcu_read_lock();
- if (timer_delete_hook(timer) == TIMER_RETRY) {
- unlock_timer(timer, flags);
-+ timer_wait_for_callback(clockid_to_kclock(timer->it_clock),
-+ timer);
-+ rcu_read_unlock();
- goto retry_delete;
- }
-+ rcu_read_unlock();
-
- spin_lock(&current->sighand->siglock);
- list_del(&timer->list);
-@@ -970,8 +995,18 @@ static void itimer_delete(struct k_itime
- retry_delete:
- spin_lock_irqsave(&timer->it_lock, flags);
-
-+ /* On RT we can race with a deletion */
-+ if (!timer->it_signal) {
-+ unlock_timer(timer, flags);
-+ return;
-+ }
-+
- if (timer_delete_hook(timer) == TIMER_RETRY) {
-+ rcu_read_lock();
- unlock_timer(timer, flags);
-+ timer_wait_for_callback(clockid_to_kclock(timer->it_clock),
-+ timer);
-+ rcu_read_unlock();
- goto retry_delete;
- }
- list_del(&timer->list);
-Index: linux-stable/include/linux/signal.h
-===================================================================
---- linux-stable.orig/include/linux/signal.h
-+++ linux-stable/include/linux/signal.h
-@@ -226,6 +226,7 @@ static inline void init_sigpending(struc
- }
-
- extern void flush_sigqueue(struct sigpending *queue);
-+extern void flush_task_sigqueue(struct task_struct *tsk);
-
- /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
- static inline int valid_signal(unsigned long sig)
-Index: linux-stable/kernel/exit.c
-===================================================================
---- linux-stable.orig/kernel/exit.c
-+++ linux-stable/kernel/exit.c
-@@ -146,7 +146,7 @@ static void __exit_signal(struct task_st
- * Do this under ->siglock, we can race with another thread
- * doing sigqueue_free() if we have SIGQUEUE_PREALLOC signals.
- */
-- flush_sigqueue(&tsk->pending);
-+ flush_task_sigqueue(tsk);
- tsk->sighand = NULL;
- spin_unlock(&sighand->siglock);
-
-Index: linux-stable/arch/x86/include/asm/signal.h
-===================================================================
---- linux-stable.orig/arch/x86/include/asm/signal.h
-+++ linux-stable/arch/x86/include/asm/signal.h
-@@ -23,6 +23,19 @@ typedef struct {
- unsigned long sig[_NSIG_WORDS];
- } sigset_t;
-
-+/*
-+ * Because some traps use the IST stack, we must keep preemption
-+ * disabled while calling do_trap(), but do_trap() may call
-+ * force_sig_info() which will grab the signal spin_locks for the
-+ * task, which in PREEMPT_RT_FULL are mutexes. By defining
-+ * ARCH_RT_DELAYS_SIGNAL_SEND the force_sig_info() will set
-+ * TIF_NOTIFY_RESUME and set up the signal to be sent on exit of the
-+ * trap.
-+ */
-+#if defined(CONFIG_PREEMPT_RT_FULL) && defined(CONFIG_X86_64)
-+#define ARCH_RT_DELAYS_SIGNAL_SEND
-+#endif
-+
- #ifndef CONFIG_COMPAT
- typedef sigset_t compat_sigset_t;
- #endif
-Index: linux-stable/arch/x86/kernel/signal.c
-===================================================================
---- linux-stable.orig/arch/x86/kernel/signal.c
-+++ linux-stable/arch/x86/kernel/signal.c
-@@ -739,6 +739,14 @@ do_notify_resume(struct pt_regs *regs, v
- mce_notify_process();
- #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
-
-+#ifdef ARCH_RT_DELAYS_SIGNAL_SEND
-+ if (unlikely(current->forced_info.si_signo)) {
-+ struct task_struct *t = current;
-+ force_sig_info(t->forced_info.si_signo, &t->forced_info, t);
-+ t->forced_info.si_signo = 0;
-+ }
-+#endif
-+
- if (thread_info_flags & _TIF_UPROBE)
- uprobe_notify_resume(regs);
-
-Index: linux-stable/drivers/char/random.c
-===================================================================
---- linux-stable.orig/drivers/char/random.c
-+++ linux-stable/drivers/char/random.c
-@@ -772,8 +772,6 @@ static void add_timer_randomness(struct
- } sample;
- long delta, delta2, delta3;
-
-- preempt_disable();
--
- sample.jiffies = jiffies;
- sample.cycles = random_get_entropy();
- sample.num = num;
-@@ -814,7 +812,6 @@ static void add_timer_randomness(struct
- */
- credit_entropy_bits(r, min_t(int, fls(delta>>1), 11));
- }
-- preempt_enable();
- }
-
- void add_input_randomness(unsigned int type, unsigned int code,
-@@ -835,21 +832,20 @@ EXPORT_SYMBOL_GPL(add_input_randomness);
-
- static DEFINE_PER_CPU(struct fast_pool, irq_randomness);
-
--void add_interrupt_randomness(int irq, int irq_flags)
-+void add_interrupt_randomness(int irq, int irq_flags, __u64 ip)
- {
- struct entropy_store *r;
- struct fast_pool *fast_pool = &__get_cpu_var(irq_randomness);
-- struct pt_regs *regs = get_irq_regs();
- unsigned long now = jiffies;
- cycles_t cycles = random_get_entropy();
- __u32 input[4], c_high, j_high;
-- __u64 ip;
-
- c_high = (sizeof(cycles) > 4) ? cycles >> 32 : 0;
- j_high = (sizeof(now) > 4) ? now >> 32 : 0;
- input[0] = cycles ^ j_high ^ irq;
- input[1] = now ^ c_high;
-- ip = regs ? instruction_pointer(regs) : _RET_IP_;
-+ if (!ip)
-+ ip = _RET_IP_;
- input[2] = ip;
- input[3] = ip >> 32;
-
-@@ -861,7 +857,11 @@ void add_interrupt_randomness(int irq, i
- fast_pool->last = now;
-
- r = nonblocking_pool.initialized ? &input_pool : &nonblocking_pool;
-+#ifndef CONFIG_PREEMPT_RT_FULL
- __mix_pool_bytes(r, &fast_pool->pool, sizeof(fast_pool->pool), NULL);
-+#else
-+ mix_pool_bytes(r, &fast_pool->pool, sizeof(fast_pool->pool), NULL);
-+#endif
- /*
- * If we don't have a valid cycle counter, and we see
- * back-to-back timer interrupts, then skip giving credit for
-Index: linux-stable/arch/arm/mach-at91/at91rm9200_time.c
-===================================================================
---- linux-stable.orig/arch/arm/mach-at91/at91rm9200_time.c
-+++ linux-stable/arch/arm/mach-at91/at91rm9200_time.c
-@@ -134,6 +134,7 @@ clkevt32k_mode(enum clock_event_mode mod
- break;
- case CLOCK_EVT_MODE_SHUTDOWN:
- case CLOCK_EVT_MODE_UNUSED:
-+ remove_irq(NR_IRQS_LEGACY + AT91_ID_SYS, &at91rm9200_timer_irq);
- case CLOCK_EVT_MODE_RESUME:
- irqmask = 0;
- break;
-Index: linux-stable/arch/arm/mach-at91/at91sam926x_time.c
-===================================================================
---- linux-stable.orig/arch/arm/mach-at91/at91sam926x_time.c
-+++ linux-stable/arch/arm/mach-at91/at91sam926x_time.c
-@@ -78,7 +78,7 @@ static struct clocksource pit_clk = {
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
- };
-
--
-+static struct irqaction at91sam926x_pit_irq;
- /*
- * Clockevent device: interrupts every 1/HZ (== pit_cycles * MCK/16)
- */
-@@ -87,6 +87,8 @@ pit_clkevt_mode(enum clock_event_mode mo
- {
- switch (mode) {
- case CLOCK_EVT_MODE_PERIODIC:
-+ /* Set up irq handler */
-+ setup_irq(at91sam926x_pit_irq.irq, &at91sam926x_pit_irq);
- /* update clocksource counter */
- pit_cnt += pit_cycle * PIT_PICNT(pit_read(AT91_PIT_PIVR));
- pit_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN
-@@ -99,6 +101,7 @@ pit_clkevt_mode(enum clock_event_mode mo
- case CLOCK_EVT_MODE_UNUSED:
- /* disable irq, leaving the clocksource active */
- pit_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN);
-+ remove_irq(at91sam926x_pit_irq.irq, &at91sam926x_pit_irq);
- break;
- case CLOCK_EVT_MODE_RESUME:
- break;
-Index: linux-stable/drivers/clocksource/tcb_clksrc.c
-===================================================================
---- linux-stable.orig/drivers/clocksource/tcb_clksrc.c
-+++ linux-stable/drivers/clocksource/tcb_clksrc.c
-@@ -23,8 +23,7 @@
- * this 32 bit free-running counter. the second channel is not used.
- *
- * - The third channel may be used to provide a 16-bit clockevent
-- * source, used in either periodic or oneshot mode. This runs
-- * at 32 KiHZ, and can handle delays of up to two seconds.
-+ * source, used in either periodic or oneshot mode.
- *
- * A boot clocksource and clockevent source are also currently needed,
- * unless the relevant platforms (ARM/AT91, AVR32/AT32) are changed so
-@@ -74,6 +73,7 @@ static struct clocksource clksrc = {
- struct tc_clkevt_device {
- struct clock_event_device clkevt;
- struct clk *clk;
-+ u32 freq;
- void __iomem *regs;
- };
-
-@@ -82,13 +82,6 @@ static struct tc_clkevt_device *to_tc_cl
- return container_of(clkevt, struct tc_clkevt_device, clkevt);
- }
-
--/* For now, we always use the 32K clock ... this optimizes for NO_HZ,
-- * because using one of the divided clocks would usually mean the
-- * tick rate can never be less than several dozen Hz (vs 0.5 Hz).
-- *
-- * A divided clock could be good for high resolution timers, since
-- * 30.5 usec resolution can seem "low".
-- */
- static u32 timer_clock;
-
- static void tc_mode(enum clock_event_mode m, struct clock_event_device *d)
-@@ -111,11 +104,12 @@ static void tc_mode(enum clock_event_mod
- case CLOCK_EVT_MODE_PERIODIC:
- clk_prepare_enable(tcd->clk);
-
-- /* slow clock, count up to RC, then irq and restart */
-+ /* count up to RC, then irq and restart */
- __raw_writel(timer_clock
- | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO,
- regs + ATMEL_TC_REG(2, CMR));
-- __raw_writel((32768 + HZ/2) / HZ, tcaddr + ATMEL_TC_REG(2, RC));
-+ __raw_writel((tcd->freq + HZ/2)/HZ,
-+ tcaddr + ATMEL_TC_REG(2, RC));
-
- /* Enable clock and interrupts on RC compare */
- __raw_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
-@@ -128,7 +122,7 @@ static void tc_mode(enum clock_event_mod
- case CLOCK_EVT_MODE_ONESHOT:
- clk_prepare_enable(tcd->clk);
-
-- /* slow clock, count up to RC, then irq and stop */
-+ /* count up to RC, then irq and stop */
- __raw_writel(timer_clock | ATMEL_TC_CPCSTOP
- | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO,
- regs + ATMEL_TC_REG(2, CMR));
-@@ -157,8 +151,12 @@ static struct tc_clkevt_device clkevt =
- .name = "tc_clkevt",
- .features = CLOCK_EVT_FEAT_PERIODIC
- | CLOCK_EVT_FEAT_ONESHOT,
-+#ifdef CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK
- /* Should be lower than at91rm9200's system timer */
- .rating = 125,
-+#else
-+ .rating = 200,
-+#endif
- .set_next_event = tc_next_event,
- .set_mode = tc_mode,
- },
-@@ -184,8 +182,9 @@ static struct irqaction tc_irqaction = {
- .handler = ch2_irq,
- };
-
--static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
-+static int __init setup_clkevents(struct atmel_tc *tc, int divisor_idx)
- {
-+ unsigned divisor = atmel_tc_divisors[divisor_idx];
- int ret;
- struct clk *t2_clk = tc->clk[2];
- int irq = tc->irq[2];
-@@ -200,7 +199,11 @@ static int __init setup_clkevents(struct
- clkevt.clk = t2_clk;
- tc_irqaction.dev_id = &clkevt;
-
-- timer_clock = clk32k_divisor_idx;
-+ timer_clock = divisor_idx;
-+ if (!divisor)
-+ clkevt.freq = 32768;
-+ else
-+ clkevt.freq = clk_get_rate(t2_clk) / divisor;
-
- clkevt.clkevt.cpumask = cpumask_of(0);
-
-@@ -208,7 +211,7 @@ static int __init setup_clkevents(struct
- if (ret)
- return ret;
-
-- clockevents_config_and_register(&clkevt.clkevt, 32768, 1, 0xffff);
-+ clockevents_config_and_register(&clkevt.clkevt, clkevt.freq, 1, 0xffff);
-
- return ret;
- }
-@@ -345,7 +348,11 @@ static int __init tcb_clksrc_init(void)
- goto err_disable_t1;
-
- /* channel 2: periodic and oneshot timer support */
-+#ifdef CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK
- ret = setup_clkevents(tc, clk32k_divisor_idx);
-+#else
-+ ret = setup_clkevents(tc, best_divisor_idx);
-+#endif
- if (ret)
- goto err_unregister_clksrc;
-
-Index: linux-stable/drivers/misc/Kconfig
-===================================================================
---- linux-stable.orig/drivers/misc/Kconfig
-+++ linux-stable/drivers/misc/Kconfig
-@@ -63,6 +63,7 @@ config ATMEL_PWM
- config ATMEL_TCLIB
- bool "Atmel AT32/AT91 Timer/Counter Library"
- depends on (AVR32 || ARCH_AT91)
-+ default y if PREEMPT_RT_FULL
- help
- Select this if you want a library to allocate the Timer/Counter
- blocks found on many Atmel processors. This facilitates using
-@@ -78,8 +79,7 @@ config ATMEL_TCB_CLKSRC
- are combined to make a single 32-bit timer.
-
- When GENERIC_CLOCKEVENTS is defined, the third timer channel
-- may be used as a clock event device supporting oneshot mode
-- (delays of up to two seconds) based on the 32 KiHz clock.
-+ may be used as a clock event device supporting oneshot mode.
-
- config ATMEL_TCB_CLKSRC_BLOCK
- int
-@@ -93,6 +93,15 @@ config ATMEL_TCB_CLKSRC_BLOCK
- TC can be used for other purposes, such as PWM generation and
- interval timing.
-
-+config ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK
-+ bool "TC Block use 32 KiHz clock"
-+ depends on ATMEL_TCB_CLKSRC
-+ default y if !PREEMPT_RT_FULL
-+ help
-+ Select this to use 32 KiHz base clock rate as TC block clock
-+ source for clock events.
-+
-+
- config DUMMY_IRQ
- tristate "Dummy IRQ handler"
- default n
-@@ -122,6 +131,35 @@ config IBM_ASM
- for information on the specific driver level and support statement
- for your IBM server.
-
-+config HWLAT_DETECTOR
-+ tristate "Testing module to detect hardware-induced latencies"
-+ depends on DEBUG_FS
-+ depends on RING_BUFFER
-+ default m
-+ ---help---
-+ A simple hardware latency detector. Use this module to detect
-+ large latencies introduced by the behavior of the underlying
-+ system firmware external to Linux. We do this using periodic
-+ use of stop_machine to grab all available CPUs and measure
-+ for unexplainable gaps in the CPU timestamp counter(s). By
-+ default, the module is not enabled until the "enable" file
-+ within the "hwlat_detector" debugfs directory is toggled.
-+
-+ This module is often used to detect SMI (System Management
-+ Interrupts) on x86 systems, though is not x86 specific. To
-+ this end, we default to using a sample window of 1 second,
-+ during which we will sample for 0.5 seconds. If an SMI or
-+ similar event occurs during that time, it is recorded
-+ into an 8K samples global ring buffer until retreived.
-+
-+ WARNING: This software should never be enabled (it can be built
-+ but should not be turned on after it is loaded) in a production
-+ environment where high latencies are a concern since the
-+ sampling mechanism actually introduces latencies for
-+ regular tasks while the CPU(s) are being held.
-+
-+ If unsure, say N
-+
- config PHANTOM
- tristate "Sensable PHANToM (PCI)"
- depends on PCI
-Index: linux-stable/drivers/net/ethernet/realtek/8139too.c
-===================================================================
---- linux-stable.orig/drivers/net/ethernet/realtek/8139too.c
-+++ linux-stable/drivers/net/ethernet/realtek/8139too.c
-@@ -2215,7 +2215,7 @@ static void rtl8139_poll_controller(stru
- struct rtl8139_private *tp = netdev_priv(dev);
- const int irq = tp->pci_dev->irq;
-
-- disable_irq(irq);
-+ disable_irq_nosync(irq);
- rtl8139_interrupt(irq, dev);
- enable_irq(irq);
- }
-Index: linux-stable/include/linux/uaccess.h
-===================================================================
---- linux-stable.orig/include/linux/uaccess.h
-+++ linux-stable/include/linux/uaccess.h
-@@ -6,14 +6,9 @@
-
- /*
- * These routines enable/disable the pagefault handler in that
-- * it will not take any locks and go straight to the fixup table.
-- *
-- * They have great resemblance to the preempt_disable/enable calls
-- * and in fact they are identical; this is because currently there is
-- * no other way to make the pagefault handlers do this. So we do
-- * disable preemption but we don't necessarily care about that.
-+ * it will not take any MM locks and go straight to the fixup table.
- */
--static inline void pagefault_disable(void)
-+static inline void raw_pagefault_disable(void)
- {
- preempt_count_inc();
- /*
-@@ -23,7 +18,7 @@ static inline void pagefault_disable(voi
- barrier();
- }
-
--static inline void pagefault_enable(void)
-+static inline void raw_pagefault_enable(void)
- {
- #ifndef CONFIG_PREEMPT
- /*
-@@ -37,6 +32,21 @@ static inline void pagefault_enable(void
- #endif
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+static inline void pagefault_disable(void)
-+{
-+ raw_pagefault_disable();
-+}
-+
-+static inline void pagefault_enable(void)
-+{
-+ raw_pagefault_enable();
-+}
-+#else
-+extern void pagefault_disable(void);
-+extern void pagefault_enable(void);
-+#endif
-+
- #ifndef ARCH_HAS_NOCACHE_UACCESS
-
- static inline unsigned long __copy_from_user_inatomic_nocache(void *to,
-@@ -76,9 +86,9 @@ static inline unsigned long __copy_from_
- mm_segment_t old_fs = get_fs(); \
- \
- set_fs(KERNEL_DS); \
-- pagefault_disable(); \
-+ raw_pagefault_disable(); \
- ret = __copy_from_user_inatomic(&(retval), (__force typeof(retval) __user *)(addr), sizeof(retval)); \
-- pagefault_enable(); \
-+ raw_pagefault_enable(); \
- set_fs(old_fs); \
- ret; \
- })
-Index: linux-stable/mm/memory.c
-===================================================================
---- linux-stable.orig/mm/memory.c
-+++ linux-stable/mm/memory.c
-@@ -3695,6 +3695,32 @@ unlock:
- return 0;
- }
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+void pagefault_disable(void)
-+{
-+ migrate_disable();
-+ current->pagefault_disabled++;
-+ /*
-+ * make sure to have issued the store before a pagefault
-+ * can hit.
-+ */
-+ barrier();
-+}
-+EXPORT_SYMBOL(pagefault_disable);
-+
-+void pagefault_enable(void)
-+{
-+ /*
-+ * make sure to issue those last loads/stores before enabling
-+ * the pagefault handler again.
-+ */
-+ barrier();
-+ current->pagefault_disabled--;
-+ migrate_enable();
-+}
-+EXPORT_SYMBOL(pagefault_enable);
-+#endif
-+
- /*
- * By the time we get here, we already hold the mm semaphore
- */
-Index: linux-stable/arch/alpha/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/alpha/mm/fault.c
-+++ linux-stable/arch/alpha/mm/fault.c
-@@ -107,7 +107,7 @@ do_page_fault(unsigned long address, uns
-
- /* If we're in an interrupt context, or have no user context,
- we must not take the fault. */
-- if (!mm || in_atomic())
-+ if (!mm || pagefault_disabled())
- goto no_context;
-
- #ifdef CONFIG_ALPHA_LARGE_VMALLOC
-Index: linux-stable/arch/arm/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/arm/mm/fault.c
-+++ linux-stable/arch/arm/mm/fault.c
-@@ -277,7 +277,7 @@ do_page_fault(unsigned long addr, unsign
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
-- if (in_atomic() || !mm)
-+ if (!mm || pagefault_disabled())
- goto no_context;
-
- if (user_mode(regs))
-Index: linux-stable/arch/avr32/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/avr32/mm/fault.c
-+++ linux-stable/arch/avr32/mm/fault.c
-@@ -81,7 +81,7 @@ asmlinkage void do_page_fault(unsigned l
- * If we're in an interrupt or have no user context, we must
- * not take the fault...
- */
-- if (in_atomic() || !mm || regs->sr & SYSREG_BIT(GM))
-+ if (!mm || regs->sr & SYSREG_BIT(GM) || pagefault_disabled())
- goto no_context;
-
- local_irq_enable();
-Index: linux-stable/arch/cris/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/cris/mm/fault.c
-+++ linux-stable/arch/cris/mm/fault.c
-@@ -113,7 +113,7 @@ do_page_fault(unsigned long address, str
- * user context, we must not take the fault.
- */
-
-- if (in_atomic() || !mm)
-+ if (!mm || pagefault_disabled())
- goto no_context;
-
- if (user_mode(regs))
-Index: linux-stable/arch/frv/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/frv/mm/fault.c
-+++ linux-stable/arch/frv/mm/fault.c
-@@ -78,7 +78,7 @@ asmlinkage void do_page_fault(int datamm
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
-- if (in_atomic() || !mm)
-+ if (!mm || pagefault_disabled())
- goto no_context;
-
- if (user_mode(__frame))
-Index: linux-stable/arch/ia64/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/ia64/mm/fault.c
-+++ linux-stable/arch/ia64/mm/fault.c
-@@ -96,7 +96,7 @@ ia64_do_page_fault (unsigned long addres
- /*
- * If we're in an interrupt or have no user context, we must not take the fault..
- */
-- if (in_atomic() || !mm)
-+ if (!mm || pagefault_disabled())
- goto no_context;
-
- #ifdef CONFIG_VIRTUAL_MEM_MAP
-Index: linux-stable/arch/m32r/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/m32r/mm/fault.c
-+++ linux-stable/arch/m32r/mm/fault.c
-@@ -114,7 +114,7 @@ asmlinkage void do_page_fault(struct pt_
- * If we're in an interrupt or have no user context or are running in an
- * atomic region then we must not take the fault..
- */
-- if (in_atomic() || !mm)
-+ if (!mm || pagefault_disabled())
- goto bad_area_nosemaphore;
-
- if (error_code & ACE_USERMODE)
-Index: linux-stable/arch/m68k/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/m68k/mm/fault.c
-+++ linux-stable/arch/m68k/mm/fault.c
-@@ -81,7 +81,7 @@ int do_page_fault(struct pt_regs *regs,
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
-- if (in_atomic() || !mm)
-+ if (!mm || pagefault_disabled())
- goto no_context;
-
- if (user_mode(regs))
-Index: linux-stable/arch/microblaze/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/microblaze/mm/fault.c
-+++ linux-stable/arch/microblaze/mm/fault.c
-@@ -107,7 +107,7 @@ void do_page_fault(struct pt_regs *regs,
- if ((error_code & 0x13) == 0x13 || (error_code & 0x11) == 0x11)
- is_write = 0;
-
-- if (unlikely(in_atomic() || !mm)) {
-+ if (unlikely(!mm || pagefault_disabled())) {
- if (kernel_mode(regs))
- goto bad_area_nosemaphore;
-
-Index: linux-stable/arch/mips/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/mips/mm/fault.c
-+++ linux-stable/arch/mips/mm/fault.c
-@@ -89,7 +89,7 @@ static void __kprobes __do_page_fault(st
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
-- if (in_atomic() || !mm)
-+ if (!mm || pagefault_disabled())
- goto bad_area_nosemaphore;
-
- if (user_mode(regs))
-Index: linux-stable/arch/mn10300/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/mn10300/mm/fault.c
-+++ linux-stable/arch/mn10300/mm/fault.c
-@@ -168,7 +168,7 @@ asmlinkage void do_page_fault(struct pt_
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
-- if (in_atomic() || !mm)
-+ if (!mm || pagefault_disabled())
- goto no_context;
-
- if ((fault_code & MMUFCR_xFC_ACCESS) == MMUFCR_xFC_ACCESS_USR)
-Index: linux-stable/arch/parisc/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/parisc/mm/fault.c
-+++ linux-stable/arch/parisc/mm/fault.c
-@@ -207,7 +207,7 @@ void do_page_fault(struct pt_regs *regs,
- int fault;
- unsigned int flags;
-
-- if (in_atomic())
-+ if (pagefault_disabled())
- goto no_context;
-
- tsk = current;
-Index: linux-stable/arch/powerpc/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/powerpc/mm/fault.c
-+++ linux-stable/arch/powerpc/mm/fault.c
-@@ -261,7 +261,7 @@ int __kprobes do_page_fault(struct pt_re
- if (!arch_irq_disabled_regs(regs))
- local_irq_enable();
-
-- if (in_atomic() || mm == NULL) {
-+ if (in_atomic() || mm == NULL || pagefault_disabled()) {
- if (!user_mode(regs)) {
- rc = SIGSEGV;
- goto bail;
-Index: linux-stable/arch/s390/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/s390/mm/fault.c
-+++ linux-stable/arch/s390/mm/fault.c
-@@ -291,7 +291,8 @@ static inline int do_exception(struct pt
- * user context.
- */
- fault = VM_FAULT_BADCONTEXT;
-- if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm))
-+ if (unlikely(!user_space_fault(trans_exc_code) ||
-+ !mm || pagefault_disabled()))
- goto out;
-
- address = trans_exc_code & __FAIL_ADDR_MASK;
-Index: linux-stable/arch/score/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/score/mm/fault.c
-+++ linux-stable/arch/score/mm/fault.c
-@@ -73,7 +73,7 @@ asmlinkage void do_page_fault(struct pt_
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
-- if (in_atomic() || !mm)
-+ if (!mm || pagefault_disabled())
- goto bad_area_nosemaphore;
-
- if (user_mode(regs))
-Index: linux-stable/arch/sh/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/sh/mm/fault.c
-+++ linux-stable/arch/sh/mm/fault.c
-@@ -438,7 +438,7 @@ asmlinkage void __kprobes do_page_fault(
- * If we're in an interrupt, have no user context or are running
- * in an atomic region then we must not take the fault:
- */
-- if (unlikely(in_atomic() || !mm)) {
-+ if (unlikely(!mm || pagefault_disabled())) {
- bad_area_nosemaphore(regs, error_code, address);
- return;
- }
-Index: linux-stable/arch/sparc/mm/fault_32.c
-===================================================================
---- linux-stable.orig/arch/sparc/mm/fault_32.c
-+++ linux-stable/arch/sparc/mm/fault_32.c
-@@ -199,7 +199,7 @@ asmlinkage void do_sparc_fault(struct pt
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
-- if (in_atomic() || !mm)
-+ if (!mm || pagefault_disabled())
- goto no_context;
-
- perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
-Index: linux-stable/arch/sparc/mm/fault_64.c
-===================================================================
---- linux-stable.orig/arch/sparc/mm/fault_64.c
-+++ linux-stable/arch/sparc/mm/fault_64.c
-@@ -324,7 +324,7 @@ asmlinkage void __kprobes do_sparc64_fau
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
-- if (in_atomic() || !mm)
-+ if (!mm || pagefault_disabled())
- goto intr_or_no_mm;
-
- perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
-Index: linux-stable/arch/tile/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/tile/mm/fault.c
-+++ linux-stable/arch/tile/mm/fault.c
-@@ -357,7 +357,7 @@ static int handle_page_fault(struct pt_r
- * If we're in an interrupt, have no user context or are running in an
- * atomic region then we must not take the fault.
- */
-- if (in_atomic() || !mm) {
-+ if (!mm || pagefault_disabled()) {
- vma = NULL; /* happy compiler */
- goto bad_area_nosemaphore;
- }
-Index: linux-stable/arch/um/kernel/trap.c
-===================================================================
---- linux-stable.orig/arch/um/kernel/trap.c
-+++ linux-stable/arch/um/kernel/trap.c
-@@ -38,7 +38,7 @@ int handle_page_fault(unsigned long addr
- * If the fault was during atomic operation, don't take the fault, just
- * fail.
- */
-- if (in_atomic())
-+ if (pagefault_disabled())
- goto out_nosemaphore;
-
- if (is_user)
-Index: linux-stable/arch/x86/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/x86/mm/fault.c
-+++ linux-stable/arch/x86/mm/fault.c
-@@ -1103,7 +1103,7 @@ __do_page_fault(struct pt_regs *regs, un
- * If we're in an interrupt, have no user context or are running
- * in an atomic region then we must not take the fault:
- */
-- if (unlikely(in_atomic() || !mm)) {
-+ if (unlikely(!mm || pagefault_disabled())) {
- bad_area_nosemaphore(regs, error_code, address);
- return;
- }
-Index: linux-stable/arch/xtensa/mm/fault.c
-===================================================================
---- linux-stable.orig/arch/xtensa/mm/fault.c
-+++ linux-stable/arch/xtensa/mm/fault.c
-@@ -57,7 +57,7 @@ void do_page_fault(struct pt_regs *regs)
- /* If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
-- if (in_atomic() || !mm) {
-+ if (!mm || pagefault_disabled()) {
- bad_page_fault(regs, address, SIGSEGV);
- return;
- }
-Index: linux-stable/mm/filemap.c
-===================================================================
---- linux-stable.orig/mm/filemap.c
-+++ linux-stable/mm/filemap.c
-@@ -1974,7 +1974,7 @@ size_t iov_iter_copy_from_user_atomic(st
- char *kaddr;
- size_t copied;
-
-- BUG_ON(!in_atomic());
-+ BUG_ON(!pagefault_disabled());
- kaddr = kmap_atomic(page);
- if (likely(i->nr_segs == 1)) {
- int left;
-Index: linux-stable/include/linux/kernel.h
-===================================================================
---- linux-stable.orig/include/linux/kernel.h
-+++ linux-stable/include/linux/kernel.h
-@@ -454,6 +454,7 @@ extern enum system_states {
- SYSTEM_HALT,
- SYSTEM_POWER_OFF,
- SYSTEM_RESTART,
-+ SYSTEM_SUSPEND,
- } system_state;
-
- #define TAINT_PROPRIETARY_MODULE 0
-Index: linux-stable/kernel/power/hibernate.c
-===================================================================
---- linux-stable.orig/kernel/power/hibernate.c
-+++ linux-stable/kernel/power/hibernate.c
-@@ -276,6 +276,8 @@ static int create_image(int platform_mod
-
- local_irq_disable();
-
-+ system_state = SYSTEM_SUSPEND;
-+
- error = syscore_suspend();
- if (error) {
- printk(KERN_ERR "PM: Some system devices failed to power down, "
-@@ -303,6 +305,7 @@ static int create_image(int platform_mod
- syscore_resume();
-
- Enable_irqs:
-+ system_state = SYSTEM_RUNNING;
- local_irq_enable();
-
- Enable_cpus:
-@@ -428,6 +431,7 @@ static int resume_target_kernel(bool pla
- goto Enable_cpus;
-
- local_irq_disable();
-+ system_state = SYSTEM_SUSPEND;
-
- error = syscore_suspend();
- if (error)
-@@ -461,6 +465,7 @@ static int resume_target_kernel(bool pla
- syscore_resume();
-
- Enable_irqs:
-+ system_state = SYSTEM_RUNNING;
- local_irq_enable();
-
- Enable_cpus:
-@@ -543,6 +548,7 @@ int hibernation_platform_enter(void)
- goto Platform_finish;
-
- local_irq_disable();
-+ system_state = SYSTEM_SUSPEND;
- syscore_suspend();
- if (pm_wakeup_pending()) {
- error = -EAGAIN;
-@@ -555,6 +561,7 @@ int hibernation_platform_enter(void)
-
- Power_up:
- syscore_resume();
-+ system_state = SYSTEM_RUNNING;
- local_irq_enable();
- enable_nonboot_cpus();
-
-Index: linux-stable/kernel/power/suspend.c
-===================================================================
---- linux-stable.orig/kernel/power/suspend.c
-+++ linux-stable/kernel/power/suspend.c
-@@ -218,6 +218,8 @@ static int suspend_enter(suspend_state_t
- arch_suspend_disable_irqs();
- BUG_ON(!irqs_disabled());
-
-+ system_state = SYSTEM_SUSPEND;
-+
- error = syscore_suspend();
- if (!error) {
- *wakeup = pm_wakeup_pending();
-@@ -228,6 +230,8 @@ static int suspend_enter(suspend_state_t
- syscore_resume();
- }
-
-+ system_state = SYSTEM_RUNNING;
-+
- arch_suspend_enable_irqs();
- BUG_ON(irqs_disabled());
-
-Index: linux-stable/mm/page_alloc.c
-===================================================================
---- linux-stable.orig/mm/page_alloc.c
-+++ linux-stable/mm/page_alloc.c
-@@ -61,6 +61,7 @@
- #include <linux/page-debug-flags.h>
- #include <linux/hugetlb.h>
- #include <linux/sched/rt.h>
-+#include <linux/locallock.h>
-
- #include <asm/sections.h>
- #include <asm/tlbflush.h>
-@@ -231,6 +232,18 @@ EXPORT_SYMBOL(nr_node_ids);
- EXPORT_SYMBOL(nr_online_nodes);
- #endif
-
-+static DEFINE_LOCAL_IRQ_LOCK(pa_lock);
-+
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+# define cpu_lock_irqsave(cpu, flags) \
-+ local_lock_irqsave_on(pa_lock, flags, cpu)
-+# define cpu_unlock_irqrestore(cpu, flags) \
-+ local_unlock_irqrestore_on(pa_lock, flags, cpu)
-+#else
-+# define cpu_lock_irqsave(cpu, flags) local_irq_save(flags)
-+# define cpu_unlock_irqrestore(cpu, flags) local_irq_restore(flags)
-+#endif
-+
- int page_group_by_mobility_disabled __read_mostly;
-
- void set_pageblock_migratetype(struct page *page, int migratetype)
-@@ -650,7 +663,7 @@ static inline int free_pages_check(struc
- }
-
- /*
-- * Frees a number of pages from the PCP lists
-+ * Frees a number of pages which have been collected from the pcp lists.
- * Assumes all pages on list are in same zone, and of same order.
- * count is the number of pages to free.
- *
-@@ -661,15 +674,49 @@ static inline int free_pages_check(struc
- * pinned" detection logic.
- */
- static void free_pcppages_bulk(struct zone *zone, int count,
-- struct per_cpu_pages *pcp)
-+ struct list_head *list)
- {
-- int migratetype = 0;
-- int batch_free = 0;
- int to_free = count;
-+ unsigned long flags;
-
-- spin_lock(&zone->lock);
-+ spin_lock_irqsave(&zone->lock, flags);
- zone->pages_scanned = 0;
-
-+ while (!list_empty(list)) {
-+ struct page *page = list_first_entry(list, struct page, lru);
-+ int mt; /* migratetype of the to-be-freed page */
-+
-+ /* must delete as __free_one_page list manipulates */
-+ list_del(&page->lru);
-+
-+ mt = get_freepage_migratetype(page);
-+ /* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
-+ __free_one_page(page, zone, 0, mt);
-+ trace_mm_page_pcpu_drain(page, 0, mt);
-+ if (likely(!is_migrate_isolate_page(page))) {
-+ __mod_zone_page_state(zone, NR_FREE_PAGES, 1);
-+ if (is_migrate_cma(mt))
-+ __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, 1);
-+ }
-+
-+ to_free--;
-+ }
-+ WARN_ON(to_free != 0);
-+ spin_unlock_irqrestore(&zone->lock, flags);
-+}
-+
-+/*
-+ * Moves a number of pages from the PCP lists to free list which
-+ * is freed outside of the locked region.
-+ *
-+ * Assumes all pages on list are in same zone, and of same order.
-+ * count is the number of pages to free.
-+ */
-+static void isolate_pcp_pages(int to_free, struct per_cpu_pages *src,
-+ struct list_head *dst)
-+{
-+ int migratetype = 0, batch_free = 0;
-+
- while (to_free) {
- struct page *page;
- struct list_head *list;
-@@ -685,7 +732,7 @@ static void free_pcppages_bulk(struct zo
- batch_free++;
- if (++migratetype == MIGRATE_PCPTYPES)
- migratetype = 0;
-- list = &pcp->lists[migratetype];
-+ list = &src->lists[migratetype];
- } while (list_empty(list));
-
- /* This is the only non-empty list. Free them all. */
-@@ -693,35 +740,25 @@ static void free_pcppages_bulk(struct zo
- batch_free = to_free;
-
- do {
-- int mt; /* migratetype of the to-be-freed page */
--
-- page = list_entry(list->prev, struct page, lru);
-- /* must delete as __free_one_page list manipulates */
-+ page = list_last_entry(list, struct page, lru);
- list_del(&page->lru);
-- mt = get_freepage_migratetype(page);
-- /* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
-- __free_one_page(page, zone, 0, mt);
-- trace_mm_page_pcpu_drain(page, 0, mt);
-- if (likely(!is_migrate_isolate_page(page))) {
-- __mod_zone_page_state(zone, NR_FREE_PAGES, 1);
-- if (is_migrate_cma(mt))
-- __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, 1);
-- }
-+ list_add(&page->lru, dst);
- } while (--to_free && --batch_free && !list_empty(list));
- }
-- spin_unlock(&zone->lock);
- }
-
- static void free_one_page(struct zone *zone, struct page *page, int order,
- int migratetype)
- {
-- spin_lock(&zone->lock);
-+ unsigned long flags;
-+
-+ spin_lock_irqsave(&zone->lock, flags);
- zone->pages_scanned = 0;
-
- __free_one_page(page, zone, order, migratetype);
- if (unlikely(!is_migrate_isolate(migratetype)))
- __mod_zone_freepage_state(zone, 1 << order, migratetype);
-- spin_unlock(&zone->lock);
-+ spin_unlock_irqrestore(&zone->lock, flags);
- }
-
- static bool free_pages_prepare(struct page *page, unsigned int order)
-@@ -759,12 +796,12 @@ static void __free_pages_ok(struct page
- if (!free_pages_prepare(page, order))
- return;
-
-- local_irq_save(flags);
-+ local_lock_irqsave(pa_lock, flags);
- __count_vm_events(PGFREE, 1 << order);
- migratetype = get_pageblock_migratetype(page);
- set_freepage_migratetype(page, migratetype);
- free_one_page(page_zone(page), page, order, migratetype);
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(pa_lock, flags);
- }
-
- void __init __free_pages_bootmem(struct page *page, unsigned int order)
-@@ -1236,20 +1273,22 @@ static int rmqueue_bulk(struct zone *zon
- void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp)
- {
- unsigned long flags;
-+ LIST_HEAD(dst);
- int to_drain;
- unsigned long batch;
-
-- local_irq_save(flags);
-+ local_lock_irqsave(pa_lock, flags);
- batch = ACCESS_ONCE(pcp->batch);
- if (pcp->count >= batch)
- to_drain = batch;
- else
- to_drain = pcp->count;
- if (to_drain > 0) {
-- free_pcppages_bulk(zone, to_drain, pcp);
-+ isolate_pcp_pages(to_drain, pcp, &dst);
- pcp->count -= to_drain;
- }
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(pa_lock, flags);
-+ free_pcppages_bulk(zone, to_drain, &dst);
- }
- #endif
-
-@@ -1268,16 +1307,21 @@ static void drain_pages(unsigned int cpu
- for_each_populated_zone(zone) {
- struct per_cpu_pageset *pset;
- struct per_cpu_pages *pcp;
-+ LIST_HEAD(dst);
-+ int count;
-
-- local_irq_save(flags);
-+ cpu_lock_irqsave(cpu, flags);
- pset = per_cpu_ptr(zone->pageset, cpu);
-
- pcp = &pset->pcp;
-- if (pcp->count) {
-- free_pcppages_bulk(zone, pcp->count, pcp);
-+ count = pcp->count;
-+ if (count) {
-+ isolate_pcp_pages(count, pcp, &dst);
- pcp->count = 0;
- }
-- local_irq_restore(flags);
-+ cpu_unlock_irqrestore(cpu, flags);
-+ if (count)
-+ free_pcppages_bulk(zone, count, &dst);
- }
- }
-
-@@ -1330,7 +1374,12 @@ void drain_all_pages(void)
- else
- cpumask_clear_cpu(cpu, &cpus_with_pcps);
- }
-+#ifndef CONFIG_PREEMPT_RT_BASE
- on_each_cpu_mask(&cpus_with_pcps, drain_local_pages, NULL, 1);
-+#else
-+ for_each_cpu(cpu, &cpus_with_pcps)
-+ drain_pages(cpu);
-+#endif
- }
-
- #ifdef CONFIG_HIBERNATION
-@@ -1385,7 +1434,7 @@ void free_hot_cold_page(struct page *pag
-
- migratetype = get_pageblock_migratetype(page);
- set_freepage_migratetype(page, migratetype);
-- local_irq_save(flags);
-+ local_lock_irqsave(pa_lock, flags);
- __count_vm_event(PGFREE);
-
- /*
-@@ -1411,12 +1460,17 @@ void free_hot_cold_page(struct page *pag
- pcp->count++;
- if (pcp->count >= pcp->high) {
- unsigned long batch = ACCESS_ONCE(pcp->batch);
-- free_pcppages_bulk(zone, batch, pcp);
-+ LIST_HEAD(dst);
-+
-+ isolate_pcp_pages(batch, pcp, &dst);
- pcp->count -= batch;
-+ local_unlock_irqrestore(pa_lock, flags);
-+ free_pcppages_bulk(zone, batch, &dst);
-+ return;
- }
-
- out:
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(pa_lock, flags);
- }
-
- /*
-@@ -1546,7 +1600,7 @@ again:
- struct per_cpu_pages *pcp;
- struct list_head *list;
-
-- local_irq_save(flags);
-+ local_lock_irqsave(pa_lock, flags);
- pcp = &this_cpu_ptr(zone->pageset)->pcp;
- list = &pcp->lists[migratetype];
- if (list_empty(list)) {
-@@ -1578,20 +1632,22 @@ again:
- */
- WARN_ON_ONCE(order > 1);
- }
-- spin_lock_irqsave(&zone->lock, flags);
-+ local_spin_lock_irqsave(pa_lock, &zone->lock, flags);
- page = __rmqueue(zone, order, migratetype);
-- spin_unlock(&zone->lock);
-- if (!page)
-+ if (!page) {
-+ spin_unlock(&zone->lock);
- goto failed;
-+ }
- __mod_zone_freepage_state(zone, -(1 << order),
- get_pageblock_migratetype(page));
-+ spin_unlock(&zone->lock);
- }
-
- __mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order));
-
- __count_zone_vm_events(PGALLOC, zone, 1 << order);
- zone_statistics(preferred_zone, zone, gfp_flags);
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(pa_lock, flags);
-
- VM_BUG_ON_PAGE(bad_range(zone, page), page);
- if (prep_new_page(page, order, gfp_flags))
-@@ -1599,7 +1655,7 @@ again:
- return page;
-
- failed:
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(pa_lock, flags);
- return NULL;
- }
-
-@@ -2260,8 +2316,8 @@ __alloc_pages_direct_compact(gfp_t gfp_m
- struct page *page;
-
- /* Page migration frees to the PCP lists but we want merging */
-- drain_pages(get_cpu());
-- put_cpu();
-+ drain_pages(get_cpu_light());
-+ put_cpu_light();
-
- page = get_page_from_freelist(gfp_mask, nodemask,
- order, zonelist, high_zoneidx,
-@@ -5531,6 +5587,7 @@ static int page_alloc_cpu_notify(struct
- void __init page_alloc_init(void)
- {
- hotcpu_notifier(page_alloc_cpu_notify, 0);
-+ local_irq_lock_init(pa_lock);
- }
-
- /*
-@@ -6426,7 +6483,7 @@ void zone_pcp_reset(struct zone *zone)
- struct per_cpu_pageset *pset;
-
- /* avoid races with drain_pages() */
-- local_irq_save(flags);
-+ local_lock_irqsave(pa_lock, flags);
- if (zone->pageset != &boot_pageset) {
- for_each_online_cpu(cpu) {
- pset = per_cpu_ptr(zone->pageset, cpu);
-@@ -6435,7 +6492,7 @@ void zone_pcp_reset(struct zone *zone)
- free_percpu(zone->pageset);
- zone->pageset = &boot_pageset;
- }
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(pa_lock, flags);
- }
-
- #ifdef CONFIG_MEMORY_HOTREMOVE
-Index: linux-stable/include/linux/pid.h
-===================================================================
---- linux-stable.orig/include/linux/pid.h
-+++ linux-stable/include/linux/pid.h
-@@ -2,6 +2,7 @@
- #define _LINUX_PID_H
-
- #include <linux/rcupdate.h>
-+#include <linux/atomic.h>
-
- enum pid_type
- {
-Index: linux-stable/include/linux/sysctl.h
-===================================================================
---- linux-stable.orig/include/linux/sysctl.h
-+++ linux-stable/include/linux/sysctl.h
-@@ -25,6 +25,7 @@
- #include <linux/rcupdate.h>
- #include <linux/wait.h>
- #include <linux/rbtree.h>
-+#include <linux/atomic.h>
- #include <uapi/linux/sysctl.h>
-
- /* For the /proc/sys support */
-Index: linux-stable/net/core/sock.c
-===================================================================
---- linux-stable.orig/net/core/sock.c
-+++ linux-stable/net/core/sock.c
-@@ -2386,12 +2386,11 @@ void lock_sock_nested(struct sock *sk, i
- if (sk->sk_lock.owned)
- __lock_sock(sk);
- sk->sk_lock.owned = 1;
-- spin_unlock(&sk->sk_lock.slock);
-+ spin_unlock_bh(&sk->sk_lock.slock);
- /*
- * The sk_lock has mutex_lock() semantics here:
- */
- mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
-- local_bh_enable();
- }
- EXPORT_SYMBOL(lock_sock_nested);
-
-Index: linux-stable/net/sched/sch_generic.c
-===================================================================
---- linux-stable.orig/net/sched/sch_generic.c
-+++ linux-stable/net/sched/sch_generic.c
-@@ -850,7 +850,7 @@ void dev_deactivate_many(struct list_hea
- /* Wait for outstanding qdisc_run calls. */
- list_for_each_entry(dev, head, close_list)
- while (some_qdisc_is_busy(dev))
-- yield();
-+ msleep(1);
- }
-
- void dev_deactivate(struct net_device *dev)
-Index: linux-stable/include/linux/interrupt.h
-===================================================================
---- linux-stable.orig/include/linux/interrupt.h
-+++ linux-stable/include/linux/interrupt.h
-@@ -57,6 +57,7 @@
- * IRQF_NO_THREAD - Interrupt cannot be threaded
- * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device
- * resume time.
-+ * IRQF_NO_SOFTIRQ_CALL - Do not process softirqs in the irq thread context (RT)
- */
- #define IRQF_DISABLED 0x00000020
- #define IRQF_SHARED 0x00000080
-@@ -70,6 +71,7 @@
- #define IRQF_FORCE_RESUME 0x00008000
- #define IRQF_NO_THREAD 0x00010000
- #define IRQF_EARLY_RESUME 0x00020000
-+#define IRQF_NO_SOFTIRQ_CALL 0x00080000
-
- #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
-
-@@ -180,7 +182,7 @@ extern void devm_free_irq(struct device
- #ifdef CONFIG_LOCKDEP
- # define local_irq_enable_in_hardirq() do { } while (0)
- #else
--# define local_irq_enable_in_hardirq() local_irq_enable()
-+# define local_irq_enable_in_hardirq() local_irq_enable_nort()
- #endif
-
- extern void disable_irq_nosync(unsigned int irq);
-@@ -257,6 +259,7 @@ struct irq_affinity_notify {
- unsigned int irq;
- struct kref kref;
- struct work_struct work;
-+ struct list_head list;
- void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
- void (*release)(struct kref *ref);
- };
-@@ -356,9 +359,13 @@ static inline int disable_irq_wake(unsig
-
-
- #ifdef CONFIG_IRQ_FORCED_THREADING
-+# ifndef CONFIG_PREEMPT_RT_BASE
- extern bool force_irqthreads;
-+# else
-+# define force_irqthreads (true)
-+# endif
- #else
--#define force_irqthreads (0)
-+#define force_irqthreads (false)
- #endif
-
- #ifndef __ARCH_SET_SOFTIRQ_PENDING
-@@ -414,9 +421,10 @@ struct softirq_action
- void (*action)(struct softirq_action *);
- };
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- asmlinkage void do_softirq(void);
- asmlinkage void __do_softirq(void);
--
-+static inline void thread_do_softirq(void) { do_softirq(); }
- #ifdef __ARCH_HAS_DO_SOFTIRQ
- void do_softirq_own_stack(void);
- #else
-@@ -425,6 +433,9 @@ static inline void do_softirq_own_stack(
- __do_softirq();
- }
- #endif
-+#else
-+extern void thread_do_softirq(void);
-+#endif
-
- extern void open_softirq(int nr, void (*action)(struct softirq_action *));
- extern void softirq_init(void);
-@@ -432,6 +443,7 @@ extern void __raise_softirq_irqoff(unsig
-
- extern void raise_softirq_irqoff(unsigned int nr);
- extern void raise_softirq(unsigned int nr);
-+extern void softirq_check_pending_idle(void);
-
- DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
-
-@@ -453,8 +465,9 @@ static inline struct task_struct *this_c
- to be executed on some cpu at least once after this.
- * If the tasklet is already scheduled, but its execution is still not
- started, it will be executed only once.
-- * If this tasklet is already running on another CPU (or schedule is called
-- from tasklet itself), it is rescheduled for later.
-+ * If this tasklet is already running on another CPU, it is rescheduled
-+ for later.
-+ * Schedule must not be called from the tasklet itself (a lockup occurs)
- * Tasklet is strictly serialized wrt itself, but not
- wrt another tasklets. If client needs some intertask synchronization,
- he makes it with spinlocks.
-@@ -479,27 +492,36 @@ struct tasklet_struct name = { NULL, 0,
- enum
- {
- TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
-- TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
-+ TASKLET_STATE_RUN, /* Tasklet is running (SMP only) */
-+ TASKLET_STATE_PENDING /* Tasklet is pending */
- };
-
--#ifdef CONFIG_SMP
-+#define TASKLET_STATEF_SCHED (1 << TASKLET_STATE_SCHED)
-+#define TASKLET_STATEF_RUN (1 << TASKLET_STATE_RUN)
-+#define TASKLET_STATEF_PENDING (1 << TASKLET_STATE_PENDING)
-+
-+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
- static inline int tasklet_trylock(struct tasklet_struct *t)
- {
- return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
- }
-
-+static inline int tasklet_tryunlock(struct tasklet_struct *t)
-+{
-+ return cmpxchg(&t->state, TASKLET_STATEF_RUN, 0) == TASKLET_STATEF_RUN;
-+}
-+
- static inline void tasklet_unlock(struct tasklet_struct *t)
- {
- smp_mb__before_clear_bit();
- clear_bit(TASKLET_STATE_RUN, &(t)->state);
- }
-
--static inline void tasklet_unlock_wait(struct tasklet_struct *t)
--{
-- while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
--}
-+extern void tasklet_unlock_wait(struct tasklet_struct *t);
-+
- #else
- #define tasklet_trylock(t) 1
-+#define tasklet_tryunlock(t) 1
- #define tasklet_unlock_wait(t) do { } while (0)
- #define tasklet_unlock(t) do { } while (0)
- #endif
-@@ -548,17 +570,8 @@ static inline void tasklet_disable(struc
- smp_mb();
- }
-
--static inline void tasklet_enable(struct tasklet_struct *t)
--{
-- smp_mb__before_atomic_dec();
-- atomic_dec(&t->count);
--}
--
--static inline void tasklet_hi_enable(struct tasklet_struct *t)
--{
-- smp_mb__before_atomic_dec();
-- atomic_dec(&t->count);
--}
-+extern void tasklet_enable(struct tasklet_struct *t);
-+extern void tasklet_hi_enable(struct tasklet_struct *t);
-
- extern void tasklet_kill(struct tasklet_struct *t);
- extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
-@@ -590,6 +603,12 @@ void tasklet_hrtimer_cancel(struct taskl
- tasklet_kill(&ttimer->tasklet);
- }
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+extern void softirq_early_init(void);
-+#else
-+static inline void softirq_early_init(void) { }
-+#endif
-+
- /*
- * Autoprobing for irqs:
- *
-Index: linux-stable/net/core/dev.c
-===================================================================
---- linux-stable.orig/net/core/dev.c
-+++ linux-stable/net/core/dev.c
-@@ -178,6 +178,7 @@ static unsigned int napi_gen_id;
- static DEFINE_HASHTABLE(napi_hash, 8);
-
- static seqcount_t devnet_rename_seq;
-+static DEFINE_MUTEX(devnet_rename_mutex);
-
- static inline void dev_base_seq_inc(struct net *net)
- {
-@@ -199,14 +200,14 @@ static inline struct hlist_head *dev_ind
- static inline void rps_lock(struct softnet_data *sd)
- {
- #ifdef CONFIG_RPS
-- spin_lock(&sd->input_pkt_queue.lock);
-+ raw_spin_lock(&sd->input_pkt_queue.raw_lock);
- #endif
- }
-
- static inline void rps_unlock(struct softnet_data *sd)
- {
- #ifdef CONFIG_RPS
-- spin_unlock(&sd->input_pkt_queue.lock);
-+ raw_spin_unlock(&sd->input_pkt_queue.raw_lock);
- #endif
- }
-
-@@ -828,7 +829,8 @@ retry:
- strcpy(name, dev->name);
- rcu_read_unlock();
- if (read_seqcount_retry(&devnet_rename_seq, seq)) {
-- cond_resched();
-+ mutex_lock(&devnet_rename_mutex);
-+ mutex_unlock(&devnet_rename_mutex);
- goto retry;
- }
-
-@@ -1094,30 +1096,28 @@ int dev_change_name(struct net_device *d
- if (dev->flags & IFF_UP)
- return -EBUSY;
-
-- write_seqcount_begin(&devnet_rename_seq);
-+ mutex_lock(&devnet_rename_mutex);
-+ __raw_write_seqcount_begin(&devnet_rename_seq);
-
-- if (strncmp(newname, dev->name, IFNAMSIZ) == 0) {
-- write_seqcount_end(&devnet_rename_seq);
-- return 0;
-- }
-+ if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
-+ goto outunlock;
-
- memcpy(oldname, dev->name, IFNAMSIZ);
-
- err = dev_get_valid_name(net, dev, newname);
-- if (err < 0) {
-- write_seqcount_end(&devnet_rename_seq);
-- return err;
-- }
-+ if (err < 0)
-+ goto outunlock;
-
- rollback:
- ret = device_rename(&dev->dev, dev->name);
- if (ret) {
- memcpy(dev->name, oldname, IFNAMSIZ);
-- write_seqcount_end(&devnet_rename_seq);
-- return ret;
-+ err = ret;
-+ goto outunlock;
- }
-
-- write_seqcount_end(&devnet_rename_seq);
-+ __raw_write_seqcount_end(&devnet_rename_seq);
-+ mutex_unlock(&devnet_rename_mutex);
-
- netdev_adjacent_rename_links(dev, oldname);
-
-@@ -1138,7 +1138,8 @@ rollback:
- /* err >= 0 after dev_alloc_name() or stores the first errno */
- if (err >= 0) {
- err = ret;
-- write_seqcount_begin(&devnet_rename_seq);
-+ mutex_lock(&devnet_rename_mutex);
-+ __raw_write_seqcount_begin(&devnet_rename_seq);
- memcpy(dev->name, oldname, IFNAMSIZ);
- memcpy(oldname, newname, IFNAMSIZ);
- goto rollback;
-@@ -1149,6 +1150,11 @@ rollback:
- }
-
- return err;
-+
-+outunlock:
-+ __raw_write_seqcount_end(&devnet_rename_seq);
-+ mutex_unlock(&devnet_rename_mutex);
-+ return err;
- }
-
- /**
-@@ -2140,6 +2146,7 @@ static inline void __netif_reschedule(st
- sd->output_queue_tailp = &q->next_sched;
- raise_softirq_irqoff(NET_TX_SOFTIRQ);
- local_irq_restore(flags);
-+ preempt_check_resched_rt();
- }
-
- void __netif_schedule(struct Qdisc *q)
-@@ -2174,6 +2181,7 @@ void __dev_kfree_skb_irq(struct sk_buff
- __this_cpu_write(softnet_data.completion_queue, skb);
- raise_softirq_irqoff(NET_TX_SOFTIRQ);
- local_irq_restore(flags);
-+ preempt_check_resched_rt();
- }
- EXPORT_SYMBOL(__dev_kfree_skb_irq);
-
-@@ -3226,6 +3234,7 @@ enqueue:
- rps_unlock(sd);
-
- local_irq_restore(flags);
-+ preempt_check_resched_rt();
-
- atomic_long_inc(&skb->dev->rx_dropped);
- kfree_skb(skb);
-@@ -3248,7 +3257,7 @@ static int netif_rx_internal(struct sk_b
- struct rps_dev_flow voidflow, *rflow = &voidflow;
- int cpu;
-
-- preempt_disable();
-+ migrate_disable();
- rcu_read_lock();
-
- cpu = get_rps_cpu(skb->dev, skb, &rflow);
-@@ -3258,13 +3267,13 @@ static int netif_rx_internal(struct sk_b
- ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
-
- rcu_read_unlock();
-- preempt_enable();
-+ migrate_enable();
- } else
- #endif
- {
- unsigned int qtail;
-- ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
-- put_cpu();
-+ ret = enqueue_to_backlog(skb, get_cpu_light(), &qtail);
-+ put_cpu_light();
- }
- return ret;
- }
-@@ -3298,16 +3307,44 @@ int netif_rx_ni(struct sk_buff *skb)
-
- trace_netif_rx_ni_entry(skb);
-
-- preempt_disable();
-+ local_bh_disable();
- err = netif_rx_internal(skb);
-- if (local_softirq_pending())
-- do_softirq();
-- preempt_enable();
-+ local_bh_enable();
-
- return err;
- }
- EXPORT_SYMBOL(netif_rx_ni);
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+/*
-+ * RT runs ksoftirqd as a real time thread and the root_lock is a
-+ * "sleeping spinlock". If the trylock fails then we can go into an
-+ * infinite loop when ksoftirqd preempted the task which actually
-+ * holds the lock, because we requeue q and raise NET_TX softirq
-+ * causing ksoftirqd to loop forever.
-+ *
-+ * It's safe to use spin_lock on RT here as softirqs run in thread
-+ * context and cannot deadlock against the thread which is holding
-+ * root_lock.
-+ *
-+ * On !RT the trylock might fail, but there we bail out from the
-+ * softirq loop after 10 attempts which we can't do on RT. And the
-+ * task holding root_lock cannot be preempted, so the only downside of
-+ * that trylock is that we need 10 loops to decide that we should have
-+ * given up in the first one :)
-+ */
-+static inline int take_root_lock(spinlock_t *lock)
-+{
-+ spin_lock(lock);
-+ return 1;
-+}
-+#else
-+static inline int take_root_lock(spinlock_t *lock)
-+{
-+ return spin_trylock(lock);
-+}
-+#endif
-+
- static void net_tx_action(struct softirq_action *h)
- {
- struct softnet_data *sd = &__get_cpu_var(softnet_data);
-@@ -3349,7 +3386,7 @@ static void net_tx_action(struct softirq
- head = head->next_sched;
-
- root_lock = qdisc_lock(q);
-- if (spin_trylock(root_lock)) {
-+ if (take_root_lock(root_lock)) {
- smp_mb__before_clear_bit();
- clear_bit(__QDISC_STATE_SCHED,
- &q->state);
-@@ -3747,7 +3784,7 @@ static void flush_backlog(void *arg)
- skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
- if (skb->dev == dev) {
- __skb_unlink(skb, &sd->input_pkt_queue);
-- kfree_skb(skb);
-+ __skb_queue_tail(&sd->tofree_queue, skb);
- input_queue_head_incr(sd);
- }
- }
-@@ -3756,10 +3793,13 @@ static void flush_backlog(void *arg)
- skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
- if (skb->dev == dev) {
- __skb_unlink(skb, &sd->process_queue);
-- kfree_skb(skb);
-+ __skb_queue_tail(&sd->tofree_queue, skb);
- input_queue_head_incr(sd);
- }
- }
-+
-+ if (!skb_queue_empty(&sd->tofree_queue))
-+ raise_softirq_irqoff(NET_RX_SOFTIRQ);
- }
-
- static int napi_gro_complete(struct sk_buff *skb)
-@@ -4144,6 +4184,7 @@ static void net_rps_action_and_irq_enabl
- } else
- #endif
- local_irq_enable();
-+ preempt_check_resched_rt();
- }
-
- static int process_backlog(struct napi_struct *napi, int quota)
-@@ -4216,6 +4257,7 @@ void __napi_schedule(struct napi_struct
- local_irq_save(flags);
- ____napi_schedule(&__get_cpu_var(softnet_data), n);
- local_irq_restore(flags);
-+ preempt_check_resched_rt();
- }
- EXPORT_SYMBOL(__napi_schedule);
-
-@@ -4338,10 +4380,17 @@ static void net_rx_action(struct softirq
- struct softnet_data *sd = &__get_cpu_var(softnet_data);
- unsigned long time_limit = jiffies + 2;
- int budget = netdev_budget;
-+ struct sk_buff *skb;
- void *have;
-
- local_irq_disable();
-
-+ while ((skb = __skb_dequeue(&sd->tofree_queue))) {
-+ local_irq_enable();
-+ kfree_skb(skb);
-+ local_irq_disable();
-+ }
-+
- while (!list_empty(&sd->poll_list)) {
- struct napi_struct *n;
- int work, weight;
-@@ -6744,6 +6793,7 @@ static int dev_cpu_callback(struct notif
-
- raise_softirq_irqoff(NET_TX_SOFTIRQ);
- local_irq_enable();
-+ preempt_check_resched_rt();
-
- /* Process offline CPU's input_pkt_queue */
- while ((skb = __skb_dequeue(&oldsd->process_queue))) {
-@@ -6754,6 +6804,9 @@ static int dev_cpu_callback(struct notif
- netif_rx_internal(skb);
- input_queue_head_incr(oldsd);
- }
-+ while ((skb = __skb_dequeue(&oldsd->tofree_queue))) {
-+ kfree_skb(skb);
-+ }
-
- return NOTIFY_OK;
- }
-@@ -7063,8 +7116,9 @@ static int __init net_dev_init(void)
- for_each_possible_cpu(i) {
- struct softnet_data *sd = &per_cpu(softnet_data, i);
-
-- skb_queue_head_init(&sd->input_pkt_queue);
-- skb_queue_head_init(&sd->process_queue);
-+ skb_queue_head_init_raw(&sd->input_pkt_queue);
-+ skb_queue_head_init_raw(&sd->process_queue);
-+ skb_queue_head_init_raw(&sd->tofree_queue);
- INIT_LIST_HEAD(&sd->poll_list);
- sd->output_queue_tailp = &sd->output_queue;
- #ifdef CONFIG_RPS
-Index: linux-stable/kernel/softirq.c
-===================================================================
---- linux-stable.orig/kernel/softirq.c
-+++ linux-stable/kernel/softirq.c
-@@ -21,10 +21,12 @@
- #include <linux/freezer.h>
- #include <linux/kthread.h>
- #include <linux/rcupdate.h>
-+#include <linux/delay.h>
- #include <linux/ftrace.h>
- #include <linux/smp.h>
- #include <linux/smpboot.h>
- #include <linux/tick.h>
-+#include <linux/locallock.h>
-
- #define CREATE_TRACE_POINTS
- #include <trace/events/irq.h>
-@@ -61,6 +63,98 @@ const char * const softirq_to_name[NR_SO
- "TASKLET", "SCHED", "HRTIMER", "RCU"
- };
-
-+#ifdef CONFIG_NO_HZ_COMMON
-+# ifdef CONFIG_PREEMPT_RT_FULL
-+
-+struct softirq_runner {
-+ struct task_struct *runner[NR_SOFTIRQS];
-+};
-+
-+static DEFINE_PER_CPU(struct softirq_runner, softirq_runners);
-+
-+static inline void softirq_set_runner(unsigned int sirq)
-+{
-+ struct softirq_runner *sr = &__get_cpu_var(softirq_runners);
-+
-+ sr->runner[sirq] = current;
-+}
-+
-+static inline void softirq_clr_runner(unsigned int sirq)
-+{
-+ struct softirq_runner *sr = &__get_cpu_var(softirq_runners);
-+
-+ sr->runner[sirq] = NULL;
-+}
-+
-+/*
-+ * On preempt-rt a softirq running context might be blocked on a
-+ * lock. There might be no other runnable task on this CPU because the
-+ * lock owner runs on some other CPU. So we have to go into idle with
-+ * the pending bit set. Therefor we need to check this otherwise we
-+ * warn about false positives which confuses users and defeats the
-+ * whole purpose of this test.
-+ *
-+ * This code is called with interrupts disabled.
-+ */
-+void softirq_check_pending_idle(void)
-+{
-+ static int rate_limit;
-+ struct softirq_runner *sr = &__get_cpu_var(softirq_runners);
-+ u32 warnpending;
-+ int i;
-+
-+ if (rate_limit >= 10)
-+ return;
-+
-+ warnpending = local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK;
-+ for (i = 0; i < NR_SOFTIRQS; i++) {
-+ struct task_struct *tsk = sr->runner[i];
-+
-+ /*
-+ * The wakeup code in rtmutex.c wakes up the task
-+ * _before_ it sets pi_blocked_on to NULL under
-+ * tsk->pi_lock. So we need to check for both: state
-+ * and pi_blocked_on.
-+ */
-+ if (tsk) {
-+ raw_spin_lock(&tsk->pi_lock);
-+ if (tsk->pi_blocked_on || tsk->state == TASK_RUNNING) {
-+ /* Clear all bits pending in that task */
-+ warnpending &= ~(tsk->softirqs_raised);
-+ warnpending &= ~(1 << i);
-+ }
-+ raw_spin_unlock(&tsk->pi_lock);
-+ }
-+ }
-+
-+ if (warnpending) {
-+ printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
-+ warnpending);
-+ rate_limit++;
-+ }
-+}
-+# else
-+/*
-+ * On !PREEMPT_RT we just printk rate limited:
-+ */
-+void softirq_check_pending_idle(void)
-+{
-+ static int rate_limit;
-+
-+ if (rate_limit < 10 &&
-+ (local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK)) {
-+ printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
-+ local_softirq_pending());
-+ rate_limit++;
-+ }
-+}
-+# endif
-+
-+#else /* !CONFIG_NO_HZ_COMMON */
-+static inline void softirq_set_runner(unsigned int sirq) { }
-+static inline void softirq_clr_runner(unsigned int sirq) { }
-+#endif
-+
- /*
- * we cannot loop indefinitely here to avoid userspace starvation,
- * but we also don't want to introduce a worst case 1/HZ latency
-@@ -76,6 +170,68 @@ static void wakeup_softirqd(void)
- wake_up_process(tsk);
- }
-
-+static void handle_softirq(unsigned int vec_nr, int cpu, int need_rcu_bh_qs)
-+{
-+ struct softirq_action *h = softirq_vec + vec_nr;
-+ unsigned int prev_count = preempt_count();
-+
-+ kstat_incr_softirqs_this_cpu(vec_nr);
-+
-+ trace_softirq_entry(vec_nr);
-+ h->action(h);
-+ trace_softirq_exit(vec_nr);
-+ if (unlikely(prev_count != preempt_count())) {
-+ pr_err("huh, entered softirq %u %s %p with preempt_count %08x, exited with %08x?\n",
-+ vec_nr, softirq_to_name[vec_nr], h->action,
-+ prev_count, preempt_count());
-+ preempt_count_set(prev_count);
-+ }
-+ if (need_rcu_bh_qs)
-+ rcu_bh_qs(cpu);
-+}
-+
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+static inline int ksoftirqd_softirq_pending(void)
-+{
-+ return local_softirq_pending();
-+}
-+
-+static void handle_pending_softirqs(u32 pending, int cpu, int need_rcu_bh_qs)
-+{
-+ struct softirq_action *h = softirq_vec;
-+ int softirq_bit;
-+
-+ local_irq_enable();
-+ h = softirq_vec;
-+
-+ while ((softirq_bit = ffs(pending))) {
-+ unsigned int vec_nr;
-+
-+ h += softirq_bit - 1;
-+ vec_nr = h - softirq_vec;
-+
-+ handle_softirq(vec_nr, cpu, need_rcu_bh_qs);
-+
-+ h++;
-+ pending >>= softirq_bit;
-+ }
-+
-+ local_irq_disable();
-+}
-+
-+static void run_ksoftirqd(unsigned int cpu)
-+{
-+ local_irq_disable();
-+ if (ksoftirqd_softirq_pending()) {
-+ __do_softirq();
-+ rcu_note_context_switch(cpu);
-+ local_irq_enable();
-+ cond_resched();
-+ return;
-+ }
-+ local_irq_enable();
-+}
-+
- /*
- * preempt_count and SOFTIRQ_OFFSET usage:
- * - preempt_count is changed by SOFTIRQ_OFFSET on entering or leaving
-@@ -227,10 +383,8 @@ asmlinkage void __do_softirq(void)
- unsigned long end = jiffies + MAX_SOFTIRQ_TIME;
- unsigned long old_flags = current->flags;
- int max_restart = MAX_SOFTIRQ_RESTART;
-- struct softirq_action *h;
- bool in_hardirq;
- __u32 pending;
-- int softirq_bit;
- int cpu;
-
- /*
-@@ -251,36 +405,7 @@ restart:
- /* Reset the pending bitmask before enabling irqs */
- set_softirq_pending(0);
-
-- local_irq_enable();
--
-- h = softirq_vec;
--
-- while ((softirq_bit = ffs(pending))) {
-- unsigned int vec_nr;
-- int prev_count;
--
-- h += softirq_bit - 1;
--
-- vec_nr = h - softirq_vec;
-- prev_count = preempt_count();
--
-- kstat_incr_softirqs_this_cpu(vec_nr);
--
-- trace_softirq_entry(vec_nr);
-- h->action(h);
-- trace_softirq_exit(vec_nr);
-- if (unlikely(prev_count != preempt_count())) {
-- pr_err("huh, entered softirq %u %s %p with preempt_count %08x, exited with %08x?\n",
-- vec_nr, softirq_to_name[vec_nr], h->action,
-- prev_count, preempt_count());
-- preempt_count_set(prev_count);
-- }
-- rcu_bh_qs(cpu);
-- h++;
-- pending >>= softirq_bit;
-- }
--
-- local_irq_disable();
-+ handle_pending_softirqs(pending, cpu, 1);
-
- pending = local_softirq_pending();
- if (pending) {
-@@ -317,6 +442,286 @@ asmlinkage void do_softirq(void)
- }
-
- /*
-+ * This function must run with irqs disabled!
-+ */
-+void raise_softirq_irqoff(unsigned int nr)
-+{
-+ __raise_softirq_irqoff(nr);
-+
-+ /*
-+ * If we're in an interrupt or softirq, we're done
-+ * (this also catches softirq-disabled code). We will
-+ * actually run the softirq once we return from
-+ * the irq or softirq.
-+ *
-+ * Otherwise we wake up ksoftirqd to make sure we
-+ * schedule the softirq soon.
-+ */
-+ if (!in_interrupt())
-+ wakeup_softirqd();
-+}
-+
-+void __raise_softirq_irqoff(unsigned int nr)
-+{
-+ trace_softirq_raise(nr);
-+ or_softirq_pending(1UL << nr);
-+}
-+
-+static inline void local_bh_disable_nort(void) { local_bh_disable(); }
-+static inline void _local_bh_enable_nort(void) { _local_bh_enable(); }
-+static void ksoftirqd_set_sched_params(unsigned int cpu) { }
-+static void ksoftirqd_clr_sched_params(unsigned int cpu, bool online) { }
-+
-+#else /* !PREEMPT_RT_FULL */
-+
-+/*
-+ * On RT we serialize softirq execution with a cpu local lock per softirq
-+ */
-+static DEFINE_PER_CPU(struct local_irq_lock [NR_SOFTIRQS], local_softirq_locks);
-+
-+void __init softirq_early_init(void)
-+{
-+ int i;
-+
-+ for (i = 0; i < NR_SOFTIRQS; i++)
-+ local_irq_lock_init(local_softirq_locks[i]);
-+}
-+
-+static void lock_softirq(int which)
-+{
-+ local_lock(local_softirq_locks[which]);
-+}
-+
-+static void unlock_softirq(int which)
-+{
-+ local_unlock(local_softirq_locks[which]);
-+}
-+
-+static void do_single_softirq(int which, int need_rcu_bh_qs)
-+{
-+ unsigned long old_flags = current->flags;
-+
-+ current->flags &= ~PF_MEMALLOC;
-+ vtime_account_irq_enter(current);
-+ current->flags |= PF_IN_SOFTIRQ;
-+ lockdep_softirq_enter();
-+ local_irq_enable();
-+ handle_softirq(which, smp_processor_id(), need_rcu_bh_qs);
-+ local_irq_disable();
-+ lockdep_softirq_exit();
-+ current->flags &= ~PF_IN_SOFTIRQ;
-+ vtime_account_irq_enter(current);
-+ tsk_restore_flags(current, old_flags, PF_MEMALLOC);
-+}
-+
-+/*
-+ * Called with interrupts disabled. Process softirqs which were raised
-+ * in current context (or on behalf of ksoftirqd).
-+ */
-+static void do_current_softirqs(int need_rcu_bh_qs)
-+{
-+ while (current->softirqs_raised) {
-+ int i = __ffs(current->softirqs_raised);
-+ unsigned int pending, mask = (1U << i);
-+
-+ current->softirqs_raised &= ~mask;
-+ local_irq_enable();
-+
-+ /*
-+ * If the lock is contended, we boost the owner to
-+ * process the softirq or leave the critical section
-+ * now.
-+ */
-+ lock_softirq(i);
-+ local_irq_disable();
-+ softirq_set_runner(i);
-+ /*
-+ * Check with the local_softirq_pending() bits,
-+ * whether we need to process this still or if someone
-+ * else took care of it.
-+ */
-+ pending = local_softirq_pending();
-+ if (pending & mask) {
-+ set_softirq_pending(pending & ~mask);
-+ do_single_softirq(i, need_rcu_bh_qs);
-+ }
-+ softirq_clr_runner(i);
-+ unlock_softirq(i);
-+ WARN_ON(current->softirq_nestcnt != 1);
-+ }
-+}
-+
-+static void __local_bh_disable(void)
-+{
-+ if (++current->softirq_nestcnt == 1)
-+ migrate_disable();
-+}
-+
-+void local_bh_disable(void)
-+{
-+ __local_bh_disable();
-+}
-+EXPORT_SYMBOL(local_bh_disable);
-+
-+void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
-+{
-+ __local_bh_disable();
-+ if (cnt & PREEMPT_CHECK_OFFSET)
-+ preempt_disable();
-+}
-+
-+static void __local_bh_enable(void)
-+{
-+ if (WARN_ON(current->softirq_nestcnt == 0))
-+ return;
-+
-+ local_irq_disable();
-+ if (current->softirq_nestcnt == 1 && current->softirqs_raised)
-+ do_current_softirqs(1);
-+ local_irq_enable();
-+
-+ if (--current->softirq_nestcnt == 0)
-+ migrate_enable();
-+}
-+
-+void local_bh_enable(void)
-+{
-+ __local_bh_enable();
-+}
-+EXPORT_SYMBOL(local_bh_enable);
-+
-+extern void __local_bh_enable_ip(unsigned long ip, unsigned int cnt)
-+{
-+ __local_bh_enable();
-+ if (cnt & PREEMPT_CHECK_OFFSET)
-+ preempt_enable();
-+}
-+
-+void local_bh_enable_ip(unsigned long ip)
-+{
-+ local_bh_enable();
-+}
-+EXPORT_SYMBOL(local_bh_enable_ip);
-+
-+void _local_bh_enable(void)
-+{
-+ if (WARN_ON(current->softirq_nestcnt == 0))
-+ return;
-+ if (--current->softirq_nestcnt == 0)
-+ migrate_enable();
-+}
-+EXPORT_SYMBOL(_local_bh_enable);
-+
-+int in_serving_softirq(void)
-+{
-+ return current->flags & PF_IN_SOFTIRQ;
-+}
-+EXPORT_SYMBOL(in_serving_softirq);
-+
-+/* Called with preemption disabled */
-+static void run_ksoftirqd(unsigned int cpu)
-+{
-+ local_irq_disable();
-+ current->softirq_nestcnt++;
-+
-+ do_current_softirqs(1);
-+ current->softirq_nestcnt--;
-+ rcu_note_context_switch(cpu);
-+ local_irq_enable();
-+}
-+
-+/*
-+ * Called from netif_rx_ni(). Preemption enabled, but migration
-+ * disabled. So the cpu can't go away under us.
-+ */
-+void thread_do_softirq(void)
-+{
-+ if (!in_serving_softirq() && current->softirqs_raised) {
-+ current->softirq_nestcnt++;
-+ do_current_softirqs(0);
-+ current->softirq_nestcnt--;
-+ }
-+}
-+
-+static void do_raise_softirq_irqoff(unsigned int nr)
-+{
-+ trace_softirq_raise(nr);
-+ or_softirq_pending(1UL << nr);
-+ /*
-+ * If we are not in a hard interrupt and inside a bh disabled
-+ * region, we simply raise the flag on current. local_bh_enable()
-+ * will make sure that the softirq is executed. Otherwise we
-+ * delegate it to ksoftirqd.
-+ */
-+
-+ if (!in_irq() && current->softirq_nestcnt)
-+ current->softirqs_raised |= (1U << nr);
-+ else if (__this_cpu_read(ksoftirqd))
-+ __this_cpu_read(ksoftirqd)->softirqs_raised |= (1U << nr);
-+}
-+
-+void __raise_softirq_irqoff(unsigned int nr)
-+{
-+ do_raise_softirq_irqoff(nr);
-+ if (!in_irq() && !current->softirq_nestcnt)
-+ wakeup_softirqd();
-+}
-+
-+/*
-+ * This function must run with irqs disabled!
-+ */
-+void raise_softirq_irqoff(unsigned int nr)
-+{
-+ do_raise_softirq_irqoff(nr);
-+
-+ /*
-+ * If we're in an hard interrupt we let irq return code deal
-+ * with the wakeup of ksoftirqd.
-+ */
-+ if (in_irq())
-+ return;
-+ /*
-+ * If we are in thread context but outside of a bh disabled
-+ * region, we need to wake ksoftirqd as well.
-+ *
-+ * CHECKME: Some of the places which do that could be wrapped
-+ * into local_bh_disable/enable pairs. Though it's unclear
-+ * whether this is worth the effort. To find those places just
-+ * raise a WARN() if the condition is met.
-+ *
-+ */
-+ if (!current->softirq_nestcnt)
-+ wakeup_softirqd();
-+}
-+
-+static inline int ksoftirqd_softirq_pending(void)
-+{
-+ return current->softirqs_raised;
-+}
-+
-+static inline void local_bh_disable_nort(void) { }
-+static inline void _local_bh_enable_nort(void) { }
-+
-+static inline void ksoftirqd_set_sched_params(unsigned int cpu)
-+{
-+ struct sched_param param = { .sched_priority = 1 };
-+
-+ sched_setscheduler(current, SCHED_FIFO, &param);
-+ /* Take over all pending softirqs when starting */
-+ local_irq_disable();
-+ current->softirqs_raised = local_softirq_pending();
-+ local_irq_enable();
-+}
-+
-+static inline void ksoftirqd_clr_sched_params(unsigned int cpu, bool online)
-+{
-+ struct sched_param param = { .sched_priority = 0 };
-+
-+ sched_setscheduler(current, SCHED_NORMAL, &param);
-+}
-+
-+#endif /* PREEMPT_RT_FULL */
-+/*
- * Enter an interrupt context.
- */
- void irq_enter(void)
-@@ -327,9 +732,9 @@ void irq_enter(void)
- * Prevent raise_softirq from needlessly waking up ksoftirqd
- * here, as softirq will be serviced on return from interrupt.
- */
-- local_bh_disable();
-+ local_bh_disable_nort();
- tick_irq_enter();
-- _local_bh_enable();
-+ _local_bh_enable_nort();
- }
-
- __irq_enter();
-@@ -337,6 +742,7 @@ void irq_enter(void)
-
- static inline void invoke_softirq(void)
- {
-+#ifndef CONFIG_PREEMPT_RT_FULL
- if (!force_irqthreads) {
- #ifdef CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK
- /*
-@@ -356,6 +762,15 @@ static inline void invoke_softirq(void)
- } else {
- wakeup_softirqd();
- }
-+#else /* PREEMPT_RT_FULL */
-+ unsigned long flags;
-+
-+ local_irq_save(flags);
-+ if (__this_cpu_read(ksoftirqd) &&
-+ __this_cpu_read(ksoftirqd)->softirqs_raised)
-+ wakeup_softirqd();
-+ local_irq_restore(flags);
-+#endif
- }
-
- static inline void tick_irq_exit(void)
-@@ -392,26 +807,6 @@ void irq_exit(void)
- trace_hardirq_exit(); /* must be last! */
- }
-
--/*
-- * This function must run with irqs disabled!
-- */
--inline void raise_softirq_irqoff(unsigned int nr)
--{
-- __raise_softirq_irqoff(nr);
--
-- /*
-- * If we're in an interrupt or softirq, we're done
-- * (this also catches softirq-disabled code). We will
-- * actually run the softirq once we return from
-- * the irq or softirq.
-- *
-- * Otherwise we wake up ksoftirqd to make sure we
-- * schedule the softirq soon.
-- */
-- if (!in_interrupt())
-- wakeup_softirqd();
--}
--
- void raise_softirq(unsigned int nr)
- {
- unsigned long flags;
-@@ -421,12 +816,6 @@ void raise_softirq(unsigned int nr)
- local_irq_restore(flags);
- }
-
--void __raise_softirq_irqoff(unsigned int nr)
--{
-- trace_softirq_raise(nr);
-- or_softirq_pending(1UL << nr);
--}
--
- void open_softirq(int nr, void (*action)(struct softirq_action *))
- {
- softirq_vec[nr].action = action;
-@@ -443,15 +832,45 @@ struct tasklet_head {
- static DEFINE_PER_CPU(struct tasklet_head, tasklet_vec);
- static DEFINE_PER_CPU(struct tasklet_head, tasklet_hi_vec);
-
-+static void inline
-+__tasklet_common_schedule(struct tasklet_struct *t, struct tasklet_head *head, unsigned int nr)
-+{
-+ if (tasklet_trylock(t)) {
-+again:
-+ /* We may have been preempted before tasklet_trylock
-+ * and __tasklet_action may have already run.
-+ * So double check the sched bit while the takslet
-+ * is locked before adding it to the list.
-+ */
-+ if (test_bit(TASKLET_STATE_SCHED, &t->state)) {
-+ t->next = NULL;
-+ *head->tail = t;
-+ head->tail = &(t->next);
-+ raise_softirq_irqoff(nr);
-+ tasklet_unlock(t);
-+ } else {
-+ /* This is subtle. If we hit the corner case above
-+ * It is possible that we get preempted right here,
-+ * and another task has successfully called
-+ * tasklet_schedule(), then this function, and
-+ * failed on the trylock. Thus we must be sure
-+ * before releasing the tasklet lock, that the
-+ * SCHED_BIT is clear. Otherwise the tasklet
-+ * may get its SCHED_BIT set, but not added to the
-+ * list
-+ */
-+ if (!tasklet_tryunlock(t))
-+ goto again;
-+ }
-+ }
-+}
-+
- void __tasklet_schedule(struct tasklet_struct *t)
- {
- unsigned long flags;
-
- local_irq_save(flags);
-- t->next = NULL;
-- *__this_cpu_read(tasklet_vec.tail) = t;
-- __this_cpu_write(tasklet_vec.tail, &(t->next));
-- raise_softirq_irqoff(TASKLET_SOFTIRQ);
-+ __tasklet_common_schedule(t, &__get_cpu_var(tasklet_vec), TASKLET_SOFTIRQ);
- local_irq_restore(flags);
- }
- EXPORT_SYMBOL(__tasklet_schedule);
-@@ -461,60 +880,123 @@ void __tasklet_hi_schedule(struct taskle
- unsigned long flags;
-
- local_irq_save(flags);
-- t->next = NULL;
-- *__this_cpu_read(tasklet_hi_vec.tail) = t;
-- __this_cpu_write(tasklet_hi_vec.tail, &(t->next));
-- raise_softirq_irqoff(HI_SOFTIRQ);
-+ __tasklet_common_schedule(t, &__get_cpu_var(tasklet_hi_vec), HI_SOFTIRQ);
- local_irq_restore(flags);
- }
- EXPORT_SYMBOL(__tasklet_hi_schedule);
-
- void __tasklet_hi_schedule_first(struct tasklet_struct *t)
- {
-- BUG_ON(!irqs_disabled());
--
-- t->next = __this_cpu_read(tasklet_hi_vec.head);
-- __this_cpu_write(tasklet_hi_vec.head, t);
-- __raise_softirq_irqoff(HI_SOFTIRQ);
-+ __tasklet_hi_schedule(t);
- }
- EXPORT_SYMBOL(__tasklet_hi_schedule_first);
-
--static void tasklet_action(struct softirq_action *a)
-+void tasklet_enable(struct tasklet_struct *t)
- {
-- struct tasklet_struct *list;
-+ if (!atomic_dec_and_test(&t->count))
-+ return;
-+ if (test_and_clear_bit(TASKLET_STATE_PENDING, &t->state))
-+ tasklet_schedule(t);
-+}
-+EXPORT_SYMBOL(tasklet_enable);
-
-- local_irq_disable();
-- list = __this_cpu_read(tasklet_vec.head);
-- __this_cpu_write(tasklet_vec.head, NULL);
-- __this_cpu_write(tasklet_vec.tail, &__get_cpu_var(tasklet_vec).head);
-- local_irq_enable();
-+void tasklet_hi_enable(struct tasklet_struct *t)
-+{
-+ if (!atomic_dec_and_test(&t->count))
-+ return;
-+ if (test_and_clear_bit(TASKLET_STATE_PENDING, &t->state))
-+ tasklet_hi_schedule(t);
-+}
-+EXPORT_SYMBOL(tasklet_hi_enable);
-+
-+static void
-+__tasklet_action(struct softirq_action *a, struct tasklet_struct *list)
-+{
-+ int loops = 1000000;
-
- while (list) {
- struct tasklet_struct *t = list;
-
- list = list->next;
-
-- if (tasklet_trylock(t)) {
-- if (!atomic_read(&t->count)) {
-- if (!test_and_clear_bit(TASKLET_STATE_SCHED,
-- &t->state))
-- BUG();
-- t->func(t->data);
-- tasklet_unlock(t);
-- continue;
-- }
-- tasklet_unlock(t);
-+ /*
-+ * Should always succeed - after a tasklist got on the
-+ * list (after getting the SCHED bit set from 0 to 1),
-+ * nothing but the tasklet softirq it got queued to can
-+ * lock it:
-+ */
-+ if (!tasklet_trylock(t)) {
-+ WARN_ON(1);
-+ continue;
- }
-
-- local_irq_disable();
- t->next = NULL;
-- *__this_cpu_read(tasklet_vec.tail) = t;
-- __this_cpu_write(tasklet_vec.tail, &(t->next));
-- __raise_softirq_irqoff(TASKLET_SOFTIRQ);
-- local_irq_enable();
-+
-+ /*
-+ * If we cannot handle the tasklet because it's disabled,
-+ * mark it as pending. tasklet_enable() will later
-+ * re-schedule the tasklet.
-+ */
-+ if (unlikely(atomic_read(&t->count))) {
-+out_disabled:
-+ /* implicit unlock: */
-+ wmb();
-+ t->state = TASKLET_STATEF_PENDING;
-+ continue;
-+ }
-+
-+ /*
-+ * After this point on the tasklet might be rescheduled
-+ * on another CPU, but it can only be added to another
-+ * CPU's tasklet list if we unlock the tasklet (which we
-+ * dont do yet).
-+ */
-+ if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
-+ WARN_ON(1);
-+
-+again:
-+ t->func(t->data);
-+
-+ /*
-+ * Try to unlock the tasklet. We must use cmpxchg, because
-+ * another CPU might have scheduled or disabled the tasklet.
-+ * We only allow the STATE_RUN -> 0 transition here.
-+ */
-+ while (!tasklet_tryunlock(t)) {
-+ /*
-+ * If it got disabled meanwhile, bail out:
-+ */
-+ if (atomic_read(&t->count))
-+ goto out_disabled;
-+ /*
-+ * If it got scheduled meanwhile, re-execute
-+ * the tasklet function:
-+ */
-+ if (test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
-+ goto again;
-+ if (!--loops) {
-+ printk("hm, tasklet state: %08lx\n", t->state);
-+ WARN_ON(1);
-+ tasklet_unlock(t);
-+ break;
-+ }
-+ }
- }
- }
-
-+static void tasklet_action(struct softirq_action *a)
-+{
-+ struct tasklet_struct *list;
-+
-+ local_irq_disable();
-+ list = __get_cpu_var(tasklet_vec).head;
-+ __get_cpu_var(tasklet_vec).head = NULL;
-+ __get_cpu_var(tasklet_vec).tail = &__get_cpu_var(tasklet_vec).head;
-+ local_irq_enable();
-+
-+ __tasklet_action(a, list);
-+}
-+
- static void tasklet_hi_action(struct softirq_action *a)
- {
- struct tasklet_struct *list;
-@@ -525,30 +1007,7 @@ static void tasklet_hi_action(struct sof
- __this_cpu_write(tasklet_hi_vec.tail, &__get_cpu_var(tasklet_hi_vec).head);
- local_irq_enable();
-
-- while (list) {
-- struct tasklet_struct *t = list;
--
-- list = list->next;
--
-- if (tasklet_trylock(t)) {
-- if (!atomic_read(&t->count)) {
-- if (!test_and_clear_bit(TASKLET_STATE_SCHED,
-- &t->state))
-- BUG();
-- t->func(t->data);
-- tasklet_unlock(t);
-- continue;
-- }
-- tasklet_unlock(t);
-- }
--
-- local_irq_disable();
-- t->next = NULL;
-- *__this_cpu_read(tasklet_hi_vec.tail) = t;
-- __this_cpu_write(tasklet_hi_vec.tail, &(t->next));
-- __raise_softirq_irqoff(HI_SOFTIRQ);
-- local_irq_enable();
-- }
-+ __tasklet_action(a, list);
- }
-
- void tasklet_init(struct tasklet_struct *t,
-@@ -569,7 +1028,7 @@ void tasklet_kill(struct tasklet_struct
-
- while (test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) {
- do {
-- yield();
-+ msleep(1);
- } while (test_bit(TASKLET_STATE_SCHED, &t->state));
- }
- tasklet_unlock_wait(t);
-@@ -643,26 +1102,26 @@ void __init softirq_init(void)
- open_softirq(HI_SOFTIRQ, tasklet_hi_action);
- }
-
--static int ksoftirqd_should_run(unsigned int cpu)
--{
-- return local_softirq_pending();
--}
--
--static void run_ksoftirqd(unsigned int cpu)
-+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
-+void tasklet_unlock_wait(struct tasklet_struct *t)
- {
-- local_irq_disable();
-- if (local_softirq_pending()) {
-+ while (test_bit(TASKLET_STATE_RUN, &(t)->state)) {
- /*
-- * We can safely run softirq on inline stack, as we are not deep
-- * in the task stack here.
-+ * Hack for now to avoid this busy-loop:
- */
-- __do_softirq();
-- rcu_note_context_switch(cpu);
-- local_irq_enable();
-- cond_resched();
-- return;
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ msleep(1);
-+#else
-+ barrier();
-+#endif
- }
-- local_irq_enable();
-+}
-+EXPORT_SYMBOL(tasklet_unlock_wait);
-+#endif
-+
-+static int ksoftirqd_should_run(unsigned int cpu)
-+{
-+ return ksoftirqd_softirq_pending();
- }
-
- #ifdef CONFIG_HOTPLUG_CPU
-@@ -744,6 +1203,8 @@ static struct notifier_block cpu_nfb = {
-
- static struct smp_hotplug_thread softirq_threads = {
- .store = &ksoftirqd,
-+ .setup = ksoftirqd_set_sched_params,
-+ .cleanup = ksoftirqd_clr_sched_params,
- .thread_should_run = ksoftirqd_should_run,
- .thread_fn = run_ksoftirqd,
- .thread_comm = "ksoftirqd/%u",
-Index: linux-stable/arch/x86/kernel/apic/io_apic.c
-===================================================================
---- linux-stable.orig/arch/x86/kernel/apic/io_apic.c
-+++ linux-stable/arch/x86/kernel/apic/io_apic.c
-@@ -2393,7 +2393,8 @@ static bool io_apic_level_ack_pending(st
- static inline bool ioapic_irqd_mask(struct irq_data *data, struct irq_cfg *cfg)
- {
- /* If we are moving the irq we need to mask it */
-- if (unlikely(irqd_is_setaffinity_pending(data))) {
-+ if (unlikely(irqd_is_setaffinity_pending(data) &&
-+ !irqd_irq_inprogress(data))) {
- mask_ioapic(cfg);
- return true;
- }
-Index: linux-stable/arch/x86/kernel/traps.c
-===================================================================
---- linux-stable.orig/arch/x86/kernel/traps.c
-+++ linux-stable/arch/x86/kernel/traps.c
-@@ -86,9 +86,21 @@ static inline void conditional_sti(struc
- local_irq_enable();
- }
-
--static inline void preempt_conditional_sti(struct pt_regs *regs)
-+static inline void conditional_sti_ist(struct pt_regs *regs)
- {
-+#ifdef CONFIG_X86_64
-+ /*
-+ * X86_64 uses a per CPU stack on the IST for certain traps
-+ * like int3. The task can not be preempted when using one
-+ * of these stacks, thus preemption must be disabled, otherwise
-+ * the stack can be corrupted if the task is scheduled out,
-+ * and another task comes in and uses this stack.
-+ *
-+ * On x86_32 the task keeps its own stack and it is OK if the
-+ * task schedules out.
-+ */
- preempt_count_inc();
-+#endif
- if (regs->flags & X86_EFLAGS_IF)
- local_irq_enable();
- }
-@@ -99,11 +111,13 @@ static inline void conditional_cli(struc
- local_irq_disable();
- }
-
--static inline void preempt_conditional_cli(struct pt_regs *regs)
-+static inline void conditional_cli_ist(struct pt_regs *regs)
- {
- if (regs->flags & X86_EFLAGS_IF)
- local_irq_disable();
-+#ifdef CONFIG_X86_64
- preempt_count_dec();
-+#endif
- }
-
- static int __kprobes
-@@ -232,9 +246,9 @@ dotraplinkage void do_stack_segment(stru
- prev_state = exception_enter();
- if (notify_die(DIE_TRAP, "stack segment", regs, error_code,
- X86_TRAP_SS, SIGBUS) != NOTIFY_STOP) {
-- preempt_conditional_sti(regs);
-+ conditional_sti_ist(regs);
- do_trap(X86_TRAP_SS, SIGBUS, "stack segment", regs, error_code, NULL);
-- preempt_conditional_cli(regs);
-+ conditional_cli_ist(regs);
- }
- exception_exit(prev_state);
- }
-@@ -343,9 +357,9 @@ dotraplinkage void __kprobes notrace do_
- * as we may switch to the interrupt stack.
- */
- debug_stack_usage_inc();
-- preempt_conditional_sti(regs);
-+ conditional_sti_ist(regs);
- do_trap(X86_TRAP_BP, SIGTRAP, "int3", regs, error_code, NULL);
-- preempt_conditional_cli(regs);
-+ conditional_cli_ist(regs);
- debug_stack_usage_dec();
- exit:
- exception_exit(prev_state);
-@@ -451,12 +465,12 @@ dotraplinkage void __kprobes do_debug(st
- debug_stack_usage_inc();
-
- /* It's safe to allow irq's after DR6 has been saved */
-- preempt_conditional_sti(regs);
-+ conditional_sti_ist(regs);
-
- if (regs->flags & X86_VM_MASK) {
- handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code,
- X86_TRAP_DB);
-- preempt_conditional_cli(regs);
-+ conditional_cli_ist(regs);
- debug_stack_usage_dec();
- goto exit;
- }
-@@ -476,7 +490,7 @@ dotraplinkage void __kprobes do_debug(st
- si_code = get_si_code(tsk->thread.debugreg6);
- if (tsk->thread.debugreg6 & (DR_STEP | DR_TRAP_BITS) || user_icebp)
- send_sigtrap(tsk, regs, error_code, si_code);
-- preempt_conditional_cli(regs);
-+ conditional_cli_ist(regs);
- debug_stack_usage_dec();
-
- exit:
-Index: linux-stable/drivers/pci/access.c
-===================================================================
---- linux-stable.orig/drivers/pci/access.c
-+++ linux-stable/drivers/pci/access.c
-@@ -441,7 +441,7 @@ void pci_cfg_access_unlock(struct pci_de
- WARN_ON(!dev->block_cfg_access);
-
- dev->block_cfg_access = 0;
-- wake_up_all(&pci_cfg_wait);
-+ wake_up_all_locked(&pci_cfg_wait);
- raw_spin_unlock_irqrestore(&pci_lock, flags);
- }
- EXPORT_SYMBOL_GPL(pci_cfg_access_unlock);
-Index: linux-stable/Documentation/trace/histograms.txt
-===================================================================
---- /dev/null
-+++ linux-stable/Documentation/trace/histograms.txt
-@@ -0,0 +1,186 @@
-+ Using the Linux Kernel Latency Histograms
-+
-+
-+This document gives a short explanation how to enable, configure and use
-+latency histograms. Latency histograms are primarily relevant in the
-+context of real-time enabled kernels (CONFIG_PREEMPT/CONFIG_PREEMPT_RT)
-+and are used in the quality management of the Linux real-time
-+capabilities.
-+
-+
-+* Purpose of latency histograms
-+
-+A latency histogram continuously accumulates the frequencies of latency
-+data. There are two types of histograms
-+- potential sources of latencies
-+- effective latencies
-+
-+
-+* Potential sources of latencies
-+
-+Potential sources of latencies are code segments where interrupts,
-+preemption or both are disabled (aka critical sections). To create
-+histograms of potential sources of latency, the kernel stores the time
-+stamp at the start of a critical section, determines the time elapsed
-+when the end of the section is reached, and increments the frequency
-+counter of that latency value - irrespective of whether any concurrently
-+running process is affected by latency or not.
-+- Configuration items (in the Kernel hacking/Tracers submenu)
-+ CONFIG_INTERRUPT_OFF_LATENCY
-+ CONFIG_PREEMPT_OFF_LATENCY
-+
-+
-+* Effective latencies
-+
-+Effective latencies are actually occuring during wakeup of a process. To
-+determine effective latencies, the kernel stores the time stamp when a
-+process is scheduled to be woken up, and determines the duration of the
-+wakeup time shortly before control is passed over to this process. Note
-+that the apparent latency in user space may be somewhat longer, since the
-+process may be interrupted after control is passed over to it but before
-+the execution in user space takes place. Simply measuring the interval
-+between enqueuing and wakeup may also not appropriate in cases when a
-+process is scheduled as a result of a timer expiration. The timer may have
-+missed its deadline, e.g. due to disabled interrupts, but this latency
-+would not be registered. Therefore, the offsets of missed timers are
-+recorded in a separate histogram. If both wakeup latency and missed timer
-+offsets are configured and enabled, a third histogram may be enabled that
-+records the overall latency as a sum of the timer latency, if any, and the
-+wakeup latency. This histogram is called "timerandwakeup".
-+- Configuration items (in the Kernel hacking/Tracers submenu)
-+ CONFIG_WAKEUP_LATENCY
-+ CONFIG_MISSED_TIMER_OFSETS
-+
-+
-+* Usage
-+
-+The interface to the administration of the latency histograms is located
-+in the debugfs file system. To mount it, either enter
-+
-+mount -t sysfs nodev /sys
-+mount -t debugfs nodev /sys/kernel/debug
-+
-+from shell command line level, or add
-+
-+nodev /sys sysfs defaults 0 0
-+nodev /sys/kernel/debug debugfs defaults 0 0
-+
-+to the file /etc/fstab. All latency histogram related files are then
-+available in the directory /sys/kernel/debug/tracing/latency_hist. A
-+particular histogram type is enabled by writing non-zero to the related
-+variable in the /sys/kernel/debug/tracing/latency_hist/enable directory.
-+Select "preemptirqsoff" for the histograms of potential sources of
-+latencies and "wakeup" for histograms of effective latencies etc. The
-+histogram data - one per CPU - are available in the files
-+
-+/sys/kernel/debug/tracing/latency_hist/preemptoff/CPUx
-+/sys/kernel/debug/tracing/latency_hist/irqsoff/CPUx
-+/sys/kernel/debug/tracing/latency_hist/preemptirqsoff/CPUx
-+/sys/kernel/debug/tracing/latency_hist/wakeup/CPUx
-+/sys/kernel/debug/tracing/latency_hist/wakeup/sharedprio/CPUx
-+/sys/kernel/debug/tracing/latency_hist/missed_timer_offsets/CPUx
-+/sys/kernel/debug/tracing/latency_hist/timerandwakeup/CPUx
-+
-+The histograms are reset by writing non-zero to the file "reset" in a
-+particular latency directory. To reset all latency data, use
-+
-+#!/bin/sh
-+
-+TRACINGDIR=/sys/kernel/debug/tracing
-+HISTDIR=$TRACINGDIR/latency_hist
-+
-+if test -d $HISTDIR
-+then
-+ cd $HISTDIR
-+ for i in `find . | grep /reset$`
-+ do
-+ echo 1 >$i
-+ done
-+fi
-+
-+
-+* Data format
-+
-+Latency data are stored with a resolution of one microsecond. The
-+maximum latency is 10,240 microseconds. The data are only valid, if the
-+overflow register is empty. Every output line contains the latency in
-+microseconds in the first row and the number of samples in the second
-+row. To display only lines with a positive latency count, use, for
-+example,
-+
-+grep -v " 0$" /sys/kernel/debug/tracing/latency_hist/preemptoff/CPU0
-+
-+#Minimum latency: 0 microseconds.
-+#Average latency: 0 microseconds.
-+#Maximum latency: 25 microseconds.
-+#Total samples: 3104770694
-+#There are 0 samples greater or equal than 10240 microseconds
-+#usecs samples
-+ 0 2984486876
-+ 1 49843506
-+ 2 58219047
-+ 3 5348126
-+ 4 2187960
-+ 5 3388262
-+ 6 959289
-+ 7 208294
-+ 8 40420
-+ 9 4485
-+ 10 14918
-+ 11 18340
-+ 12 25052
-+ 13 19455
-+ 14 5602
-+ 15 969
-+ 16 47
-+ 17 18
-+ 18 14
-+ 19 1
-+ 20 3
-+ 21 2
-+ 22 5
-+ 23 2
-+ 25 1
-+
-+
-+* Wakeup latency of a selected process
-+
-+To only collect wakeup latency data of a particular process, write the
-+PID of the requested process to
-+
-+/sys/kernel/debug/tracing/latency_hist/wakeup/pid
-+
-+PIDs are not considered, if this variable is set to 0.
-+
-+
-+* Details of the process with the highest wakeup latency so far
-+
-+Selected data of the process that suffered from the highest wakeup
-+latency that occurred in a particular CPU are available in the file
-+
-+/sys/kernel/debug/tracing/latency_hist/wakeup/max_latency-CPUx.
-+
-+In addition, other relevant system data at the time when the
-+latency occurred are given.
-+
-+The format of the data is (all in one line):
-+<PID> <Priority> <Latency> (<Timeroffset>) <Command> \
-+<- <PID> <Priority> <Command> <Timestamp>
-+
-+The value of <Timeroffset> is only relevant in the combined timer
-+and wakeup latency recording. In the wakeup recording, it is
-+always 0, in the missed_timer_offsets recording, it is the same
-+as <Latency>.
-+
-+When retrospectively searching for the origin of a latency and
-+tracing was not enabled, it may be helpful to know the name and
-+some basic data of the task that (finally) was switching to the
-+late real-tlme task. In addition to the victim's data, also the
-+data of the possible culprit are therefore displayed after the
-+"<-" symbol.
-+
-+Finally, the timestamp of the time when the latency occurred
-+in <seconds>.<microseconds> after the most recent system boot
-+is provided.
-+
-+These data are also reset when the wakeup histogram is reset.
-Index: linux-stable/include/linux/hrtimer.h
-===================================================================
---- linux-stable.orig/include/linux/hrtimer.h
-+++ linux-stable/include/linux/hrtimer.h
-@@ -111,6 +111,11 @@ struct hrtimer {
- enum hrtimer_restart (*function)(struct hrtimer *);
- struct hrtimer_clock_base *base;
- unsigned long state;
-+ struct list_head cb_entry;
-+ int irqsafe;
-+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
-+ ktime_t praecox;
-+#endif
- #ifdef CONFIG_TIMER_STATS
- int start_pid;
- void *start_site;
-@@ -147,6 +152,7 @@ struct hrtimer_clock_base {
- int index;
- clockid_t clockid;
- struct timerqueue_head active;
-+ struct list_head expired;
- ktime_t resolution;
- ktime_t (*get_time)(void);
- ktime_t softirq_time;
-@@ -190,6 +196,9 @@ struct hrtimer_cpu_base {
- unsigned long nr_hangs;
- ktime_t max_hang_time;
- #endif
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ wait_queue_head_t wait;
-+#endif
- struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
- };
-
-@@ -385,6 +394,13 @@ static inline int hrtimer_restart(struct
- return hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
- }
-
-+/* Softirq preemption could deadlock timer removal */
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ extern void hrtimer_wait_for_timer(const struct hrtimer *timer);
-+#else
-+# define hrtimer_wait_for_timer(timer) do { cpu_relax(); } while (0)
-+#endif
-+
- /* Query timers: */
- extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer);
- extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp);
-@@ -445,9 +461,8 @@ extern int schedule_hrtimeout_range_cloc
- unsigned long delta, const enum hrtimer_mode mode, int clock);
- extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode);
-
--/* Soft interrupt function to run the hrtimer queues: */
-+/* Called from the periodic timer tick */
- extern void hrtimer_run_queues(void);
--extern void hrtimer_run_pending(void);
-
- /* Bootup initialization: */
- extern void __init hrtimers_init(void);
-Index: linux-stable/include/trace/events/hist.h
-===================================================================
---- /dev/null
-+++ linux-stable/include/trace/events/hist.h
-@@ -0,0 +1,72 @@
-+#undef TRACE_SYSTEM
-+#define TRACE_SYSTEM hist
-+
-+#if !defined(_TRACE_HIST_H) || defined(TRACE_HEADER_MULTI_READ)
-+#define _TRACE_HIST_H
-+
-+#include "latency_hist.h"
-+#include <linux/tracepoint.h>
-+
-+#if !defined(CONFIG_PREEMPT_OFF_HIST) && !defined(CONFIG_INTERRUPT_OFF_HIST)
-+#define trace_preemptirqsoff_hist(a, b)
-+#else
-+TRACE_EVENT(preemptirqsoff_hist,
-+
-+ TP_PROTO(int reason, int starthist),
-+
-+ TP_ARGS(reason, starthist),
-+
-+ TP_STRUCT__entry(
-+ __field(int, reason)
-+ __field(int, starthist)
-+ ),
-+
-+ TP_fast_assign(
-+ __entry->reason = reason;
-+ __entry->starthist = starthist;
-+ ),
-+
-+ TP_printk("reason=%s starthist=%s", getaction(__entry->reason),
-+ __entry->starthist ? "start" : "stop")
-+);
-+#endif
-+
-+#ifndef CONFIG_MISSED_TIMER_OFFSETS_HIST
-+#define trace_hrtimer_interrupt(a, b, c, d)
-+#else
-+TRACE_EVENT(hrtimer_interrupt,
-+
-+ TP_PROTO(int cpu, long long offset, struct task_struct *curr,
-+ struct task_struct *task),
-+
-+ TP_ARGS(cpu, offset, curr, task),
-+
-+ TP_STRUCT__entry(
-+ __field(int, cpu)
-+ __field(long long, offset)
-+ __array(char, ccomm, TASK_COMM_LEN)
-+ __field(int, cprio)
-+ __array(char, tcomm, TASK_COMM_LEN)
-+ __field(int, tprio)
-+ ),
-+
-+ TP_fast_assign(
-+ __entry->cpu = cpu;
-+ __entry->offset = offset;
-+ memcpy(__entry->ccomm, curr->comm, TASK_COMM_LEN);
-+ __entry->cprio = curr->prio;
-+ memcpy(__entry->tcomm, task != NULL ? task->comm : "<none>",
-+ task != NULL ? TASK_COMM_LEN : 7);
-+ __entry->tprio = task != NULL ? task->prio : -1;
-+ ),
-+
-+ TP_printk("cpu=%d offset=%lld curr=%s[%d] thread=%s[%d]",
-+ __entry->cpu, __entry->offset, __entry->ccomm,
-+ __entry->cprio, __entry->tcomm, __entry->tprio)
-+);
-+#endif
-+
-+#endif /* _TRACE_HIST_H */
-+
-+/* This part must be outside protection */
-+#include <trace/define_trace.h>
-Index: linux-stable/include/trace/events/latency_hist.h
-===================================================================
---- /dev/null
-+++ linux-stable/include/trace/events/latency_hist.h
-@@ -0,0 +1,29 @@
-+#ifndef _LATENCY_HIST_H
-+#define _LATENCY_HIST_H
-+
-+enum hist_action {
-+ IRQS_ON,
-+ PREEMPT_ON,
-+ TRACE_STOP,
-+ IRQS_OFF,
-+ PREEMPT_OFF,
-+ TRACE_START,
-+};
-+
-+static char *actions[] = {
-+ "IRQS_ON",
-+ "PREEMPT_ON",
-+ "TRACE_STOP",
-+ "IRQS_OFF",
-+ "PREEMPT_OFF",
-+ "TRACE_START",
-+};
-+
-+static inline char *getaction(int action)
-+{
-+ if (action >= 0 && action <= sizeof(actions)/sizeof(actions[0]))
-+ return actions[action];
-+ return "unknown";
-+}
-+
-+#endif /* _LATENCY_HIST_H */
-Index: linux-stable/kernel/hrtimer.c
-===================================================================
---- linux-stable.orig/kernel/hrtimer.c
-+++ linux-stable/kernel/hrtimer.c
-@@ -48,11 +48,13 @@
- #include <linux/sched/rt.h>
- #include <linux/sched/deadline.h>
- #include <linux/timer.h>
-+#include <linux/kthread.h>
- #include <linux/freezer.h>
-
- #include <asm/uaccess.h>
-
- #include <trace/events/timer.h>
-+#include <trace/events/hist.h>
-
- /*
- * The timer bases:
-@@ -630,8 +632,7 @@ static int hrtimer_reprogram(struct hrti
- * When the callback is running, we do not reprogram the clock event
- * device. The timer callback is either running on a different CPU or
- * the callback is executed in the hrtimer_interrupt context. The
-- * reprogramming is handled either by the softirq, which called the
-- * callback or at the end of the hrtimer_interrupt.
-+ * reprogramming is handled at the end of the hrtimer_interrupt.
- */
- if (hrtimer_callback_running(timer))
- return 0;
-@@ -666,6 +667,9 @@ static int hrtimer_reprogram(struct hrti
- return res;
- }
-
-+static void __run_hrtimer(struct hrtimer *timer, ktime_t *now);
-+static int hrtimer_rt_defer(struct hrtimer *timer);
-+
- /*
- * Initialize the high resolution related parts of cpu_base
- */
-@@ -682,9 +686,18 @@ static inline void hrtimer_init_hres(str
- * and expiry check is done in the hrtimer_interrupt or in the softirq.
- */
- static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
-- struct hrtimer_clock_base *base)
-+ struct hrtimer_clock_base *base,
-+ int wakeup)
- {
-- return base->cpu_base->hres_active && hrtimer_reprogram(timer, base);
-+ if (!(base->cpu_base->hres_active && hrtimer_reprogram(timer, base)))
-+ return 0;
-+ if (!wakeup)
-+ return -ETIME;
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ if (!hrtimer_rt_defer(timer))
-+ return -ETIME;
-+#endif
-+ return 1;
- }
-
- static inline ktime_t hrtimer_update_base(struct hrtimer_cpu_base *base)
-@@ -752,6 +765,44 @@ static void clock_was_set_work(struct wo
-
- static DECLARE_WORK(hrtimer_work, clock_was_set_work);
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+/*
-+ * RT can not call schedule_work from real interrupt context.
-+ * Need to make a thread to do the real work.
-+ */
-+static struct task_struct *clock_set_delay_thread;
-+static bool do_clock_set_delay;
-+
-+static int run_clock_set_delay(void *ignore)
-+{
-+ while (!kthread_should_stop()) {
-+ set_current_state(TASK_INTERRUPTIBLE);
-+ if (do_clock_set_delay) {
-+ do_clock_set_delay = false;
-+ schedule_work(&hrtimer_work);
-+ }
-+ schedule();
-+ }
-+ __set_current_state(TASK_RUNNING);
-+ return 0;
-+}
-+
-+void clock_was_set_delayed(void)
-+{
-+ do_clock_set_delay = true;
-+ /* Make visible before waking up process */
-+ smp_wmb();
-+ wake_up_process(clock_set_delay_thread);
-+}
-+
-+static __init int create_clock_set_delay_thread(void)
-+{
-+ clock_set_delay_thread = kthread_run(run_clock_set_delay, NULL, "kclksetdelayd");
-+ BUG_ON(!clock_set_delay_thread);
-+ return 0;
-+}
-+early_initcall(create_clock_set_delay_thread);
-+#else /* PREEMPT_RT_FULL */
- /*
- * Called from timekeeping and resume code to reprogramm the hrtimer
- * interrupt device on all cpus.
-@@ -760,6 +811,7 @@ void clock_was_set_delayed(void)
- {
- schedule_work(&hrtimer_work);
- }
-+#endif
-
- #else
-
-@@ -769,12 +821,18 @@ static inline int hrtimer_switch_to_hres
- static inline void
- hrtimer_force_reprogram(struct hrtimer_cpu_base *base, int skip_equal) { }
- static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
-- struct hrtimer_clock_base *base)
-+ struct hrtimer_clock_base *base,
-+ int wakeup)
- {
- return 0;
- }
- static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { }
- static inline void retrigger_next_event(void *arg) { }
-+static inline int hrtimer_reprogram(struct hrtimer *timer,
-+ struct hrtimer_clock_base *base)
-+{
-+ return 0;
-+}
-
- #endif /* CONFIG_HIGH_RES_TIMERS */
-
-@@ -893,6 +951,32 @@ u64 hrtimer_forward(struct hrtimer *time
- }
- EXPORT_SYMBOL_GPL(hrtimer_forward);
-
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+# define wake_up_timer_waiters(b) wake_up(&(b)->wait)
-+
-+/**
-+ * hrtimer_wait_for_timer - Wait for a running timer
-+ *
-+ * @timer: timer to wait for
-+ *
-+ * The function waits in case the timers callback function is
-+ * currently executed on the waitqueue of the timer base. The
-+ * waitqueue is woken up after the timer callback function has
-+ * finished execution.
-+ */
-+void hrtimer_wait_for_timer(const struct hrtimer *timer)
-+{
-+ struct hrtimer_clock_base *base = timer->base;
-+
-+ if (base && base->cpu_base && !timer->irqsafe)
-+ wait_event(base->cpu_base->wait,
-+ !(timer->state & HRTIMER_STATE_CALLBACK));
-+}
-+
-+#else
-+# define wake_up_timer_waiters(b) do { } while (0)
-+#endif
-+
- /*
- * enqueue_hrtimer - internal function to (re)start a timer
- *
-@@ -936,6 +1020,11 @@ static void __remove_hrtimer(struct hrti
- if (!(timer->state & HRTIMER_STATE_ENQUEUED))
- goto out;
-
-+ if (unlikely(!list_empty(&timer->cb_entry))) {
-+ list_del_init(&timer->cb_entry);
-+ goto out;
-+ }
-+
- next_timer = timerqueue_getnext(&base->active);
- timerqueue_del(&base->active, &timer->node);
- if (&timer->node == next_timer) {
-@@ -1024,6 +1113,17 @@ int __hrtimer_start_range_ns(struct hrti
-
- timer_stats_hrtimer_set_start_info(timer);
-
-+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
-+ {
-+ ktime_t now = new_base->get_time();
-+
-+ if (ktime_to_ns(tim) < ktime_to_ns(now))
-+ timer->praecox = now;
-+ else
-+ timer->praecox = ktime_set(0, 0);
-+ }
-+#endif
-+
- leftmost = enqueue_hrtimer(timer, new_base);
-
- /*
-@@ -1032,9 +1132,19 @@ int __hrtimer_start_range_ns(struct hrti
- *
- * XXX send_remote_softirq() ?
- */
-- if (leftmost && new_base->cpu_base == &__get_cpu_var(hrtimer_bases)
-- && hrtimer_enqueue_reprogram(timer, new_base)) {
-- if (wakeup) {
-+ if (leftmost && new_base->cpu_base == &__get_cpu_var(hrtimer_bases)) {
-+ ret = hrtimer_enqueue_reprogram(timer, new_base, wakeup);
-+ if (ret < 0) {
-+ /*
-+ * In case we failed to reprogram the timer (mostly
-+ * because out current timer is already elapsed),
-+ * remove it again and report a failure. This avoids
-+ * stale base->first entries.
-+ */
-+ debug_deactivate(timer);
-+ __remove_hrtimer(timer, new_base,
-+ timer->state & HRTIMER_STATE_CALLBACK, 0);
-+ } else if (ret > 0) {
- /*
- * We need to drop cpu_base->lock to avoid a
- * lock ordering issue vs. rq->lock.
-@@ -1042,9 +1152,7 @@ int __hrtimer_start_range_ns(struct hrti
- raw_spin_unlock(&new_base->cpu_base->lock);
- raise_softirq_irqoff(HRTIMER_SOFTIRQ);
- local_irq_restore(flags);
-- return ret;
-- } else {
-- __raise_softirq_irqoff(HRTIMER_SOFTIRQ);
-+ return 0;
- }
- }
-
-@@ -1134,7 +1242,7 @@ int hrtimer_cancel(struct hrtimer *timer
-
- if (ret >= 0)
- return ret;
-- cpu_relax();
-+ hrtimer_wait_for_timer(timer);
- }
- }
- EXPORT_SYMBOL_GPL(hrtimer_cancel);
-@@ -1213,6 +1321,7 @@ static void __hrtimer_init(struct hrtime
-
- base = hrtimer_clockid_to_base(clock_id);
- timer->base = &cpu_base->clock_base[base];
-+ INIT_LIST_HEAD(&timer->cb_entry);
- timerqueue_init(&timer->node);
-
- #ifdef CONFIG_TIMER_STATS
-@@ -1296,6 +1405,126 @@ static void __run_hrtimer(struct hrtimer
- timer->state &= ~HRTIMER_STATE_CALLBACK;
- }
-
-+static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer);
-+
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+static void hrtimer_rt_reprogram(int restart, struct hrtimer *timer,
-+ struct hrtimer_clock_base *base)
-+{
-+ /*
-+ * Note, we clear the callback flag before we requeue the
-+ * timer otherwise we trigger the callback_running() check
-+ * in hrtimer_reprogram().
-+ */
-+ timer->state &= ~HRTIMER_STATE_CALLBACK;
-+
-+ if (restart != HRTIMER_NORESTART) {
-+ BUG_ON(hrtimer_active(timer));
-+ /*
-+ * Enqueue the timer, if it's the leftmost timer then
-+ * we need to reprogram it.
-+ */
-+ if (!enqueue_hrtimer(timer, base))
-+ return;
-+
-+#ifndef CONFIG_HIGH_RES_TIMERS
-+ }
-+#else
-+ if (base->cpu_base->hres_active &&
-+ hrtimer_reprogram(timer, base))
-+ goto requeue;
-+
-+ } else if (hrtimer_active(timer)) {
-+ /*
-+ * If the timer was rearmed on another CPU, reprogram
-+ * the event device.
-+ */
-+ if (&timer->node == base->active.next &&
-+ base->cpu_base->hres_active &&
-+ hrtimer_reprogram(timer, base))
-+ goto requeue;
-+ }
-+ return;
-+
-+requeue:
-+ /*
-+ * Timer is expired. Thus move it from tree to pending list
-+ * again.
-+ */
-+ __remove_hrtimer(timer, base, timer->state, 0);
-+ list_add_tail(&timer->cb_entry, &base->expired);
-+#endif
-+}
-+
-+/*
-+ * The changes in mainline which removed the callback modes from
-+ * hrtimer are not yet working with -rt. The non wakeup_process()
-+ * based callbacks which involve sleeping locks need to be treated
-+ * seperately.
-+ */
-+static void hrtimer_rt_run_pending(void)
-+{
-+ enum hrtimer_restart (*fn)(struct hrtimer *);
-+ struct hrtimer_cpu_base *cpu_base;
-+ struct hrtimer_clock_base *base;
-+ struct hrtimer *timer;
-+ int index, restart;
-+
-+ local_irq_disable();
-+ cpu_base = &per_cpu(hrtimer_bases, smp_processor_id());
-+
-+ raw_spin_lock(&cpu_base->lock);
-+
-+ for (index = 0; index < HRTIMER_MAX_CLOCK_BASES; index++) {
-+ base = &cpu_base->clock_base[index];
-+
-+ while (!list_empty(&base->expired)) {
-+ timer = list_first_entry(&base->expired,
-+ struct hrtimer, cb_entry);
-+
-+ /*
-+ * Same as the above __run_hrtimer function
-+ * just we run with interrupts enabled.
-+ */
-+ debug_hrtimer_deactivate(timer);
-+ __remove_hrtimer(timer, base, HRTIMER_STATE_CALLBACK, 0);
-+ timer_stats_account_hrtimer(timer);
-+ fn = timer->function;
-+
-+ raw_spin_unlock_irq(&cpu_base->lock);
-+ restart = fn(timer);
-+ raw_spin_lock_irq(&cpu_base->lock);
-+
-+ hrtimer_rt_reprogram(restart, timer, base);
-+ }
-+ }
-+
-+ raw_spin_unlock_irq(&cpu_base->lock);
-+
-+ wake_up_timer_waiters(cpu_base);
-+}
-+
-+static int hrtimer_rt_defer(struct hrtimer *timer)
-+{
-+ if (timer->irqsafe)
-+ return 0;
-+
-+ __remove_hrtimer(timer, timer->base, timer->state, 0);
-+ list_add_tail(&timer->cb_entry, &timer->base->expired);
-+ return 1;
-+}
-+
-+#else
-+
-+static inline void hrtimer_rt_run_pending(void)
-+{
-+ hrtimer_peek_ahead_timers();
-+}
-+
-+static inline int hrtimer_rt_defer(struct hrtimer *timer) { return 0; }
-+
-+#endif
-+
- #ifdef CONFIG_HIGH_RES_TIMERS
-
- /*
-@@ -1306,7 +1535,7 @@ void hrtimer_interrupt(struct clock_even
- {
- struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
- ktime_t expires_next, now, entry_time, delta;
-- int i, retries = 0;
-+ int i, retries = 0, raise = 0;
-
- BUG_ON(!cpu_base->hres_active);
- cpu_base->nr_events++;
-@@ -1341,6 +1570,15 @@ retry:
-
- timer = container_of(node, struct hrtimer, node);
-
-+ trace_hrtimer_interrupt(raw_smp_processor_id(),
-+ ktime_to_ns(ktime_sub(ktime_to_ns(timer->praecox) ?
-+ timer->praecox : hrtimer_get_expires(timer),
-+ basenow)),
-+ current,
-+ timer->function == hrtimer_wakeup ?
-+ container_of(timer, struct hrtimer_sleeper,
-+ timer)->task : NULL);
-+
- /*
- * The immediate goal for using the softexpires is
- * minimizing wakeups, not running timers at the
-@@ -1366,7 +1604,10 @@ retry:
- break;
- }
-
-- __run_hrtimer(timer, &basenow);
-+ if (!hrtimer_rt_defer(timer))
-+ __run_hrtimer(timer, &basenow);
-+ else
-+ raise = 1;
- }
- }
-
-@@ -1381,7 +1622,7 @@ retry:
- if (expires_next.tv64 == KTIME_MAX ||
- !tick_program_event(expires_next, 0)) {
- cpu_base->hang_detected = 0;
-- return;
-+ goto out;
- }
-
- /*
-@@ -1425,6 +1666,9 @@ retry:
- tick_program_event(expires_next, 1);
- printk_once(KERN_WARNING "hrtimer: interrupt took %llu ns\n",
- ktime_to_ns(delta));
-+out:
-+ if (raise)
-+ raise_softirq_irqoff(HRTIMER_SOFTIRQ);
- }
-
- /*
-@@ -1460,40 +1704,16 @@ void hrtimer_peek_ahead_timers(void)
- __hrtimer_peek_ahead_timers();
- local_irq_restore(flags);
- }
--
--static void run_hrtimer_softirq(struct softirq_action *h)
--{
-- hrtimer_peek_ahead_timers();
--}
--
- #else /* CONFIG_HIGH_RES_TIMERS */
-
- static inline void __hrtimer_peek_ahead_timers(void) { }
-
- #endif /* !CONFIG_HIGH_RES_TIMERS */
-
--/*
-- * Called from timer softirq every jiffy, expire hrtimers:
-- *
-- * For HRT its the fall back code to run the softirq in the timer
-- * softirq context in case the hrtimer initialization failed or has
-- * not been done yet.
-- */
--void hrtimer_run_pending(void)
--{
-- if (hrtimer_hres_active())
-- return;
-
-- /*
-- * This _is_ ugly: We have to check in the softirq context,
-- * whether we can switch to highres and / or nohz mode. The
-- * clocksource switch happens in the timer interrupt with
-- * xtime_lock held. Notification from there only sets the
-- * check bit in the tick_oneshot code, otherwise we might
-- * deadlock vs. xtime_lock.
-- */
-- if (tick_check_oneshot_change(!hrtimer_is_hres_enabled()))
-- hrtimer_switch_to_hres();
-+static void run_hrtimer_softirq(struct softirq_action *h)
-+{
-+ hrtimer_rt_run_pending();
- }
-
- /*
-@@ -1504,11 +1724,18 @@ void hrtimer_run_queues(void)
- struct timerqueue_node *node;
- struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
- struct hrtimer_clock_base *base;
-- int index, gettime = 1;
-+ int index, gettime = 1, raise = 0;
-
- if (hrtimer_hres_active())
- return;
-
-+ /*
-+ * Check whether we can switch to highres mode.
-+ */
-+ if (tick_check_oneshot_change(!hrtimer_is_hres_enabled())
-+ && hrtimer_switch_to_hres())
-+ return;
-+
- for (index = 0; index < HRTIMER_MAX_CLOCK_BASES; index++) {
- base = &cpu_base->clock_base[index];
- if (!timerqueue_getnext(&base->active))
-@@ -1529,10 +1756,16 @@ void hrtimer_run_queues(void)
- hrtimer_get_expires_tv64(timer))
- break;
-
-- __run_hrtimer(timer, &base->softirq_time);
-+ if (!hrtimer_rt_defer(timer))
-+ __run_hrtimer(timer, &base->softirq_time);
-+ else
-+ raise = 1;
- }
- raw_spin_unlock(&cpu_base->lock);
- }
-+
-+ if (raise)
-+ raise_softirq_irqoff(HRTIMER_SOFTIRQ);
- }
-
- /*
-@@ -1554,16 +1787,18 @@ static enum hrtimer_restart hrtimer_wake
- void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task)
- {
- sl->timer.function = hrtimer_wakeup;
-+ sl->timer.irqsafe = 1;
- sl->task = task;
- }
- EXPORT_SYMBOL_GPL(hrtimer_init_sleeper);
-
--static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode)
-+static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode,
-+ unsigned long state)
- {
- hrtimer_init_sleeper(t, current);
-
- do {
-- set_current_state(TASK_INTERRUPTIBLE);
-+ set_current_state(state);
- hrtimer_start_expires(&t->timer, mode);
- if (!hrtimer_active(&t->timer))
- t->task = NULL;
-@@ -1607,7 +1842,8 @@ long __sched hrtimer_nanosleep_restart(s
- HRTIMER_MODE_ABS);
- hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires);
-
-- if (do_nanosleep(&t, HRTIMER_MODE_ABS))
-+ /* cpu_chill() does not care about restart state. */
-+ if (do_nanosleep(&t, HRTIMER_MODE_ABS, TASK_INTERRUPTIBLE))
- goto out;
-
- rmtp = restart->nanosleep.rmtp;
-@@ -1624,8 +1860,10 @@ out:
- return ret;
- }
-
--long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
-- const enum hrtimer_mode mode, const clockid_t clockid)
-+static long
-+__hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
-+ const enum hrtimer_mode mode, const clockid_t clockid,
-+ unsigned long state)
- {
- struct restart_block *restart;
- struct hrtimer_sleeper t;
-@@ -1638,7 +1876,7 @@ long hrtimer_nanosleep(struct timespec *
-
- hrtimer_init_on_stack(&t.timer, clockid, mode);
- hrtimer_set_expires_range_ns(&t.timer, timespec_to_ktime(*rqtp), slack);
-- if (do_nanosleep(&t, mode))
-+ if (do_nanosleep(&t, mode, state))
- goto out;
-
- /* Absolute timers do not update the rmtp value and restart: */
-@@ -1665,6 +1903,12 @@ out:
- return ret;
- }
-
-+long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
-+ const enum hrtimer_mode mode, const clockid_t clockid)
-+{
-+ return __hrtimer_nanosleep(rqtp, rmtp, mode, clockid, TASK_INTERRUPTIBLE);
-+}
-+
- SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
- struct timespec __user *, rmtp)
- {
-@@ -1679,6 +1923,26 @@ SYSCALL_DEFINE2(nanosleep, struct timesp
- return hrtimer_nanosleep(&tu, rmtp, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
- }
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+/*
-+ * Sleep for 1 ms in hope whoever holds what we want will let it go.
-+ */
-+void cpu_chill(void)
-+{
-+ struct timespec tu = {
-+ .tv_nsec = NSEC_PER_MSEC,
-+ };
-+ unsigned int freeze_flag = current->flags & PF_NOFREEZE;
-+
-+ current->flags |= PF_NOFREEZE;
-+ __hrtimer_nanosleep(&tu, NULL, HRTIMER_MODE_REL, CLOCK_MONOTONIC,
-+ TASK_UNINTERRUPTIBLE);
-+ if (!freeze_flag)
-+ current->flags &= ~PF_NOFREEZE;
-+}
-+EXPORT_SYMBOL(cpu_chill);
-+#endif
-+
- /*
- * Functions related to boot-time initialization:
- */
-@@ -1690,9 +1954,13 @@ static void init_hrtimers_cpu(int cpu)
- for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
- cpu_base->clock_base[i].cpu_base = cpu_base;
- timerqueue_init_head(&cpu_base->clock_base[i].active);
-+ INIT_LIST_HEAD(&cpu_base->clock_base[i].expired);
- }
-
- hrtimer_init_hres(cpu_base);
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ init_waitqueue_head(&cpu_base->wait);
-+#endif
- }
-
- #ifdef CONFIG_HOTPLUG_CPU
-@@ -1805,9 +2073,7 @@ void __init hrtimers_init(void)
- hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE,
- (void *)(long)smp_processor_id());
- register_cpu_notifier(&hrtimers_nb);
--#ifdef CONFIG_HIGH_RES_TIMERS
- open_softirq(HRTIMER_SOFTIRQ, run_hrtimer_softirq);
--#endif
- }
-
- /**
-Index: linux-stable/kernel/trace/Kconfig
-===================================================================
---- linux-stable.orig/kernel/trace/Kconfig
-+++ linux-stable/kernel/trace/Kconfig
-@@ -192,6 +192,24 @@ config IRQSOFF_TRACER
- enabled. This option and the preempt-off timing option can be
- used together or separately.)
-
-+config INTERRUPT_OFF_HIST
-+ bool "Interrupts-off Latency Histogram"
-+ depends on IRQSOFF_TRACER
-+ help
-+ This option generates continuously updated histograms (one per cpu)
-+ of the duration of time periods with interrupts disabled. The
-+ histograms are disabled by default. To enable them, write a non-zero
-+ number to
-+
-+ /sys/kernel/debug/tracing/latency_hist/enable/preemptirqsoff
-+
-+ If PREEMPT_OFF_HIST is also selected, additional histograms (one
-+ per cpu) are generated that accumulate the duration of time periods
-+ when both interrupts and preemption are disabled. The histogram data
-+ will be located in the debug file system at
-+
-+ /sys/kernel/debug/tracing/latency_hist/irqsoff
-+
- config PREEMPT_TRACER
- bool "Preemption-off Latency Tracer"
- default n
-@@ -216,6 +234,24 @@ config PREEMPT_TRACER
- enabled. This option and the irqs-off timing option can be
- used together or separately.)
-
-+config PREEMPT_OFF_HIST
-+ bool "Preemption-off Latency Histogram"
-+ depends on PREEMPT_TRACER
-+ help
-+ This option generates continuously updated histograms (one per cpu)
-+ of the duration of time periods with preemption disabled. The
-+ histograms are disabled by default. To enable them, write a non-zero
-+ number to
-+
-+ /sys/kernel/debug/tracing/latency_hist/enable/preemptirqsoff
-+
-+ If INTERRUPT_OFF_HIST is also selected, additional histograms (one
-+ per cpu) are generated that accumulate the duration of time periods
-+ when both interrupts and preemption are disabled. The histogram data
-+ will be located in the debug file system at
-+
-+ /sys/kernel/debug/tracing/latency_hist/preemptoff
-+
- config SCHED_TRACER
- bool "Scheduling Latency Tracer"
- select GENERIC_TRACER
-@@ -226,6 +262,74 @@ config SCHED_TRACER
- This tracer tracks the latency of the highest priority task
- to be scheduled in, starting from the point it has woken up.
-
-+config WAKEUP_LATENCY_HIST
-+ bool "Scheduling Latency Histogram"
-+ depends on SCHED_TRACER
-+ help
-+ This option generates continuously updated histograms (one per cpu)
-+ of the scheduling latency of the highest priority task.
-+ The histograms are disabled by default. To enable them, write a
-+ non-zero number to
-+
-+ /sys/kernel/debug/tracing/latency_hist/enable/wakeup
-+
-+ Two different algorithms are used, one to determine the latency of
-+ processes that exclusively use the highest priority of the system and
-+ another one to determine the latency of processes that share the
-+ highest system priority with other processes. The former is used to
-+ improve hardware and system software, the latter to optimize the
-+ priority design of a given system. The histogram data will be
-+ located in the debug file system at
-+
-+ /sys/kernel/debug/tracing/latency_hist/wakeup
-+
-+ and
-+
-+ /sys/kernel/debug/tracing/latency_hist/wakeup/sharedprio
-+
-+ If both Scheduling Latency Histogram and Missed Timer Offsets
-+ Histogram are selected, additional histogram data will be collected
-+ that contain, in addition to the wakeup latency, the timer latency, in
-+ case the wakeup was triggered by an expired timer. These histograms
-+ are available in the
-+
-+ /sys/kernel/debug/tracing/latency_hist/timerandwakeup
-+
-+ directory. They reflect the apparent interrupt and scheduling latency
-+ and are best suitable to determine the worst-case latency of a given
-+ system. To enable these histograms, write a non-zero number to
-+
-+ /sys/kernel/debug/tracing/latency_hist/enable/timerandwakeup
-+
-+config MISSED_TIMER_OFFSETS_HIST
-+ depends on HIGH_RES_TIMERS
-+ select GENERIC_TRACER
-+ bool "Missed Timer Offsets Histogram"
-+ help
-+ Generate a histogram of missed timer offsets in microseconds. The
-+ histograms are disabled by default. To enable them, write a non-zero
-+ number to
-+
-+ /sys/kernel/debug/tracing/latency_hist/enable/missed_timer_offsets
-+
-+ The histogram data will be located in the debug file system at
-+
-+ /sys/kernel/debug/tracing/latency_hist/missed_timer_offsets
-+
-+ If both Scheduling Latency Histogram and Missed Timer Offsets
-+ Histogram are selected, additional histogram data will be collected
-+ that contain, in addition to the wakeup latency, the timer latency, in
-+ case the wakeup was triggered by an expired timer. These histograms
-+ are available in the
-+
-+ /sys/kernel/debug/tracing/latency_hist/timerandwakeup
-+
-+ directory. They reflect the apparent interrupt and scheduling latency
-+ and are best suitable to determine the worst-case latency of a given
-+ system. To enable these histograms, write a non-zero number to
-+
-+ /sys/kernel/debug/tracing/latency_hist/enable/timerandwakeup
-+
- config ENABLE_DEFAULT_TRACERS
- bool "Trace process context switches and events"
- depends on !GENERIC_TRACER
-Index: linux-stable/kernel/trace/Makefile
-===================================================================
---- linux-stable.orig/kernel/trace/Makefile
-+++ linux-stable/kernel/trace/Makefile
-@@ -34,6 +34,10 @@ obj-$(CONFIG_FUNCTION_TRACER) += trace_f
- obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
- obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
- obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
-+obj-$(CONFIG_INTERRUPT_OFF_HIST) += latency_hist.o
-+obj-$(CONFIG_PREEMPT_OFF_HIST) += latency_hist.o
-+obj-$(CONFIG_WAKEUP_LATENCY_HIST) += latency_hist.o
-+obj-$(CONFIG_MISSED_TIMER_OFFSETS_HIST) += latency_hist.o
- obj-$(CONFIG_NOP_TRACER) += trace_nop.o
- obj-$(CONFIG_STACK_TRACER) += trace_stack.o
- obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
-Index: linux-stable/kernel/trace/latency_hist.c
-===================================================================
---- /dev/null
-+++ linux-stable/kernel/trace/latency_hist.c
-@@ -0,0 +1,1178 @@
-+/*
-+ * kernel/trace/latency_hist.c
-+ *
-+ * Add support for histograms of preemption-off latency and
-+ * interrupt-off latency and wakeup latency, it depends on
-+ * Real-Time Preemption Support.
-+ *
-+ * Copyright (C) 2005 MontaVista Software, Inc.
-+ * Yi Yang <yyang@ch.mvista.com>
-+ *
-+ * Converted to work with the new latency tracer.
-+ * Copyright (C) 2008 Red Hat, Inc.
-+ * Steven Rostedt <srostedt@redhat.com>
-+ *
-+ */
-+#include <linux/module.h>
-+#include <linux/debugfs.h>
-+#include <linux/seq_file.h>
-+#include <linux/percpu.h>
-+#include <linux/kallsyms.h>
-+#include <linux/uaccess.h>
-+#include <linux/sched.h>
-+#include <linux/sched/rt.h>
-+#include <linux/slab.h>
-+#include <linux/atomic.h>
-+#include <asm/div64.h>
-+
-+#include "trace.h"
-+#include <trace/events/sched.h>
-+
-+#define NSECS_PER_USECS 1000L
-+
-+#define CREATE_TRACE_POINTS
-+#include <trace/events/hist.h>
-+
-+enum {
-+ IRQSOFF_LATENCY = 0,
-+ PREEMPTOFF_LATENCY,
-+ PREEMPTIRQSOFF_LATENCY,
-+ WAKEUP_LATENCY,
-+ WAKEUP_LATENCY_SHAREDPRIO,
-+ MISSED_TIMER_OFFSETS,
-+ TIMERANDWAKEUP_LATENCY,
-+ MAX_LATENCY_TYPE,
-+};
-+
-+#define MAX_ENTRY_NUM 10240
-+
-+struct hist_data {
-+ atomic_t hist_mode; /* 0 log, 1 don't log */
-+ long offset; /* set it to MAX_ENTRY_NUM/2 for a bipolar scale */
-+ long min_lat;
-+ long max_lat;
-+ unsigned long long below_hist_bound_samples;
-+ unsigned long long above_hist_bound_samples;
-+ long long accumulate_lat;
-+ unsigned long long total_samples;
-+ unsigned long long hist_array[MAX_ENTRY_NUM];
-+};
-+
-+struct enable_data {
-+ int latency_type;
-+ int enabled;
-+};
-+
-+static char *latency_hist_dir_root = "latency_hist";
-+
-+#ifdef CONFIG_INTERRUPT_OFF_HIST
-+static DEFINE_PER_CPU(struct hist_data, irqsoff_hist);
-+static char *irqsoff_hist_dir = "irqsoff";
-+static DEFINE_PER_CPU(cycles_t, hist_irqsoff_start);
-+static DEFINE_PER_CPU(int, hist_irqsoff_counting);
-+#endif
-+
-+#ifdef CONFIG_PREEMPT_OFF_HIST
-+static DEFINE_PER_CPU(struct hist_data, preemptoff_hist);
-+static char *preemptoff_hist_dir = "preemptoff";
-+static DEFINE_PER_CPU(cycles_t, hist_preemptoff_start);
-+static DEFINE_PER_CPU(int, hist_preemptoff_counting);
-+#endif
-+
-+#if defined(CONFIG_PREEMPT_OFF_HIST) && defined(CONFIG_INTERRUPT_OFF_HIST)
-+static DEFINE_PER_CPU(struct hist_data, preemptirqsoff_hist);
-+static char *preemptirqsoff_hist_dir = "preemptirqsoff";
-+static DEFINE_PER_CPU(cycles_t, hist_preemptirqsoff_start);
-+static DEFINE_PER_CPU(int, hist_preemptirqsoff_counting);
-+#endif
-+
-+#if defined(CONFIG_PREEMPT_OFF_HIST) || defined(CONFIG_INTERRUPT_OFF_HIST)
-+static notrace void probe_preemptirqsoff_hist(void *v, int reason, int start);
-+static struct enable_data preemptirqsoff_enabled_data = {
-+ .latency_type = PREEMPTIRQSOFF_LATENCY,
-+ .enabled = 0,
-+};
-+#endif
-+
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+struct maxlatproc_data {
-+ char comm[FIELD_SIZEOF(struct task_struct, comm)];
-+ char current_comm[FIELD_SIZEOF(struct task_struct, comm)];
-+ int pid;
-+ int current_pid;
-+ int prio;
-+ int current_prio;
-+ long latency;
-+ long timeroffset;
-+ cycle_t timestamp;
-+};
-+#endif
-+
-+#ifdef CONFIG_WAKEUP_LATENCY_HIST
-+static DEFINE_PER_CPU(struct hist_data, wakeup_latency_hist);
-+static DEFINE_PER_CPU(struct hist_data, wakeup_latency_hist_sharedprio);
-+static char *wakeup_latency_hist_dir = "wakeup";
-+static char *wakeup_latency_hist_dir_sharedprio = "sharedprio";
-+static notrace void probe_wakeup_latency_hist_start(void *v,
-+ struct task_struct *p, int success);
-+static notrace void probe_wakeup_latency_hist_stop(void *v,
-+ struct task_struct *prev, struct task_struct *next);
-+static notrace void probe_sched_migrate_task(void *,
-+ struct task_struct *task, int cpu);
-+static struct enable_data wakeup_latency_enabled_data = {
-+ .latency_type = WAKEUP_LATENCY,
-+ .enabled = 0,
-+};
-+static DEFINE_PER_CPU(struct maxlatproc_data, wakeup_maxlatproc);
-+static DEFINE_PER_CPU(struct maxlatproc_data, wakeup_maxlatproc_sharedprio);
-+static DEFINE_PER_CPU(struct task_struct *, wakeup_task);
-+static DEFINE_PER_CPU(int, wakeup_sharedprio);
-+static unsigned long wakeup_pid;
-+#endif
-+
-+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
-+static DEFINE_PER_CPU(struct hist_data, missed_timer_offsets);
-+static char *missed_timer_offsets_dir = "missed_timer_offsets";
-+static notrace void probe_hrtimer_interrupt(void *v, int cpu,
-+ long long offset, struct task_struct *curr, struct task_struct *task);
-+static struct enable_data missed_timer_offsets_enabled_data = {
-+ .latency_type = MISSED_TIMER_OFFSETS,
-+ .enabled = 0,
-+};
-+static DEFINE_PER_CPU(struct maxlatproc_data, missed_timer_offsets_maxlatproc);
-+static unsigned long missed_timer_offsets_pid;
-+#endif
-+
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+static DEFINE_PER_CPU(struct hist_data, timerandwakeup_latency_hist);
-+static char *timerandwakeup_latency_hist_dir = "timerandwakeup";
-+static struct enable_data timerandwakeup_enabled_data = {
-+ .latency_type = TIMERANDWAKEUP_LATENCY,
-+ .enabled = 0,
-+};
-+static DEFINE_PER_CPU(struct maxlatproc_data, timerandwakeup_maxlatproc);
-+#endif
-+
-+void notrace latency_hist(int latency_type, int cpu, long latency,
-+ long timeroffset, cycle_t stop,
-+ struct task_struct *p)
-+{
-+ struct hist_data *my_hist;
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+ struct maxlatproc_data *mp = NULL;
-+#endif
-+
-+ if (!cpu_possible(cpu) || latency_type < 0 ||
-+ latency_type >= MAX_LATENCY_TYPE)
-+ return;
-+
-+ switch (latency_type) {
-+#ifdef CONFIG_INTERRUPT_OFF_HIST
-+ case IRQSOFF_LATENCY:
-+ my_hist = &per_cpu(irqsoff_hist, cpu);
-+ break;
-+#endif
-+#ifdef CONFIG_PREEMPT_OFF_HIST
-+ case PREEMPTOFF_LATENCY:
-+ my_hist = &per_cpu(preemptoff_hist, cpu);
-+ break;
-+#endif
-+#if defined(CONFIG_PREEMPT_OFF_HIST) && defined(CONFIG_INTERRUPT_OFF_HIST)
-+ case PREEMPTIRQSOFF_LATENCY:
-+ my_hist = &per_cpu(preemptirqsoff_hist, cpu);
-+ break;
-+#endif
-+#ifdef CONFIG_WAKEUP_LATENCY_HIST
-+ case WAKEUP_LATENCY:
-+ my_hist = &per_cpu(wakeup_latency_hist, cpu);
-+ mp = &per_cpu(wakeup_maxlatproc, cpu);
-+ break;
-+ case WAKEUP_LATENCY_SHAREDPRIO:
-+ my_hist = &per_cpu(wakeup_latency_hist_sharedprio, cpu);
-+ mp = &per_cpu(wakeup_maxlatproc_sharedprio, cpu);
-+ break;
-+#endif
-+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
-+ case MISSED_TIMER_OFFSETS:
-+ my_hist = &per_cpu(missed_timer_offsets, cpu);
-+ mp = &per_cpu(missed_timer_offsets_maxlatproc, cpu);
-+ break;
-+#endif
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+ case TIMERANDWAKEUP_LATENCY:
-+ my_hist = &per_cpu(timerandwakeup_latency_hist, cpu);
-+ mp = &per_cpu(timerandwakeup_maxlatproc, cpu);
-+ break;
-+#endif
-+
-+ default:
-+ return;
-+ }
-+
-+ latency += my_hist->offset;
-+
-+ if (atomic_read(&my_hist->hist_mode) == 0)
-+ return;
-+
-+ if (latency < 0 || latency >= MAX_ENTRY_NUM) {
-+ if (latency < 0)
-+ my_hist->below_hist_bound_samples++;
-+ else
-+ my_hist->above_hist_bound_samples++;
-+ } else
-+ my_hist->hist_array[latency]++;
-+
-+ if (unlikely(latency > my_hist->max_lat ||
-+ my_hist->min_lat == LONG_MAX)) {
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+ if (latency_type == WAKEUP_LATENCY ||
-+ latency_type == WAKEUP_LATENCY_SHAREDPRIO ||
-+ latency_type == MISSED_TIMER_OFFSETS ||
-+ latency_type == TIMERANDWAKEUP_LATENCY) {
-+ strncpy(mp->comm, p->comm, sizeof(mp->comm));
-+ strncpy(mp->current_comm, current->comm,
-+ sizeof(mp->current_comm));
-+ mp->pid = task_pid_nr(p);
-+ mp->current_pid = task_pid_nr(current);
-+ mp->prio = p->prio;
-+ mp->current_prio = current->prio;
-+ mp->latency = latency;
-+ mp->timeroffset = timeroffset;
-+ mp->timestamp = stop;
-+ }
-+#endif
-+ my_hist->max_lat = latency;
-+ }
-+ if (unlikely(latency < my_hist->min_lat))
-+ my_hist->min_lat = latency;
-+ my_hist->total_samples++;
-+ my_hist->accumulate_lat += latency;
-+}
-+
-+static void *l_start(struct seq_file *m, loff_t *pos)
-+{
-+ loff_t *index_ptr = NULL;
-+ loff_t index = *pos;
-+ struct hist_data *my_hist = m->private;
-+
-+ if (index == 0) {
-+ char minstr[32], avgstr[32], maxstr[32];
-+
-+ atomic_dec(&my_hist->hist_mode);
-+
-+ if (likely(my_hist->total_samples)) {
-+ long avg = (long) div64_s64(my_hist->accumulate_lat,
-+ my_hist->total_samples);
-+ snprintf(minstr, sizeof(minstr), "%ld",
-+ my_hist->min_lat - my_hist->offset);
-+ snprintf(avgstr, sizeof(avgstr), "%ld",
-+ avg - my_hist->offset);
-+ snprintf(maxstr, sizeof(maxstr), "%ld",
-+ my_hist->max_lat - my_hist->offset);
-+ } else {
-+ strcpy(minstr, "<undef>");
-+ strcpy(avgstr, minstr);
-+ strcpy(maxstr, minstr);
-+ }
-+
-+ seq_printf(m, "#Minimum latency: %s microseconds\n"
-+ "#Average latency: %s microseconds\n"
-+ "#Maximum latency: %s microseconds\n"
-+ "#Total samples: %llu\n"
-+ "#There are %llu samples lower than %ld"
-+ " microseconds.\n"
-+ "#There are %llu samples greater or equal"
-+ " than %ld microseconds.\n"
-+ "#usecs\t%16s\n",
-+ minstr, avgstr, maxstr,
-+ my_hist->total_samples,
-+ my_hist->below_hist_bound_samples,
-+ -my_hist->offset,
-+ my_hist->above_hist_bound_samples,
-+ MAX_ENTRY_NUM - my_hist->offset,
-+ "samples");
-+ }
-+ if (index < MAX_ENTRY_NUM) {
-+ index_ptr = kmalloc(sizeof(loff_t), GFP_KERNEL);
-+ if (index_ptr)
-+ *index_ptr = index;
-+ }
-+
-+ return index_ptr;
-+}
-+
-+static void *l_next(struct seq_file *m, void *p, loff_t *pos)
-+{
-+ loff_t *index_ptr = p;
-+ struct hist_data *my_hist = m->private;
-+
-+ if (++*pos >= MAX_ENTRY_NUM) {
-+ atomic_inc(&my_hist->hist_mode);
-+ return NULL;
-+ }
-+ *index_ptr = *pos;
-+ return index_ptr;
-+}
-+
-+static void l_stop(struct seq_file *m, void *p)
-+{
-+ kfree(p);
-+}
-+
-+static int l_show(struct seq_file *m, void *p)
-+{
-+ int index = *(loff_t *) p;
-+ struct hist_data *my_hist = m->private;
-+
-+ seq_printf(m, "%6ld\t%16llu\n", index - my_hist->offset,
-+ my_hist->hist_array[index]);
-+ return 0;
-+}
-+
-+static const struct seq_operations latency_hist_seq_op = {
-+ .start = l_start,
-+ .next = l_next,
-+ .stop = l_stop,
-+ .show = l_show
-+};
-+
-+static int latency_hist_open(struct inode *inode, struct file *file)
-+{
-+ int ret;
-+
-+ ret = seq_open(file, &latency_hist_seq_op);
-+ if (!ret) {
-+ struct seq_file *seq = file->private_data;
-+ seq->private = inode->i_private;
-+ }
-+ return ret;
-+}
-+
-+static const struct file_operations latency_hist_fops = {
-+ .open = latency_hist_open,
-+ .read = seq_read,
-+ .llseek = seq_lseek,
-+ .release = seq_release,
-+};
-+
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+static void clear_maxlatprocdata(struct maxlatproc_data *mp)
-+{
-+ mp->comm[0] = mp->current_comm[0] = '\0';
-+ mp->prio = mp->current_prio = mp->pid = mp->current_pid =
-+ mp->latency = mp->timeroffset = -1;
-+ mp->timestamp = 0;
-+}
-+#endif
-+
-+static void hist_reset(struct hist_data *hist)
-+{
-+ atomic_dec(&hist->hist_mode);
-+
-+ memset(hist->hist_array, 0, sizeof(hist->hist_array));
-+ hist->below_hist_bound_samples = 0ULL;
-+ hist->above_hist_bound_samples = 0ULL;
-+ hist->min_lat = LONG_MAX;
-+ hist->max_lat = LONG_MIN;
-+ hist->total_samples = 0ULL;
-+ hist->accumulate_lat = 0LL;
-+
-+ atomic_inc(&hist->hist_mode);
-+}
-+
-+static ssize_t
-+latency_hist_reset(struct file *file, const char __user *a,
-+ size_t size, loff_t *off)
-+{
-+ int cpu;
-+ struct hist_data *hist = NULL;
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+ struct maxlatproc_data *mp = NULL;
-+#endif
-+ off_t latency_type = (off_t) file->private_data;
-+
-+ for_each_online_cpu(cpu) {
-+
-+ switch (latency_type) {
-+#ifdef CONFIG_PREEMPT_OFF_HIST
-+ case PREEMPTOFF_LATENCY:
-+ hist = &per_cpu(preemptoff_hist, cpu);
-+ break;
-+#endif
-+#ifdef CONFIG_INTERRUPT_OFF_HIST
-+ case IRQSOFF_LATENCY:
-+ hist = &per_cpu(irqsoff_hist, cpu);
-+ break;
-+#endif
-+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
-+ case PREEMPTIRQSOFF_LATENCY:
-+ hist = &per_cpu(preemptirqsoff_hist, cpu);
-+ break;
-+#endif
-+#ifdef CONFIG_WAKEUP_LATENCY_HIST
-+ case WAKEUP_LATENCY:
-+ hist = &per_cpu(wakeup_latency_hist, cpu);
-+ mp = &per_cpu(wakeup_maxlatproc, cpu);
-+ break;
-+ case WAKEUP_LATENCY_SHAREDPRIO:
-+ hist = &per_cpu(wakeup_latency_hist_sharedprio, cpu);
-+ mp = &per_cpu(wakeup_maxlatproc_sharedprio, cpu);
-+ break;
-+#endif
-+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
-+ case MISSED_TIMER_OFFSETS:
-+ hist = &per_cpu(missed_timer_offsets, cpu);
-+ mp = &per_cpu(missed_timer_offsets_maxlatproc, cpu);
-+ break;
-+#endif
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+ case TIMERANDWAKEUP_LATENCY:
-+ hist = &per_cpu(timerandwakeup_latency_hist, cpu);
-+ mp = &per_cpu(timerandwakeup_maxlatproc, cpu);
-+ break;
-+#endif
-+ }
-+
-+ hist_reset(hist);
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+ if (latency_type == WAKEUP_LATENCY ||
-+ latency_type == WAKEUP_LATENCY_SHAREDPRIO ||
-+ latency_type == MISSED_TIMER_OFFSETS ||
-+ latency_type == TIMERANDWAKEUP_LATENCY)
-+ clear_maxlatprocdata(mp);
-+#endif
-+ }
-+
-+ return size;
-+}
-+
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+static ssize_t
-+show_pid(struct file *file, char __user *ubuf, size_t cnt, loff_t *ppos)
-+{
-+ char buf[64];
-+ int r;
-+ unsigned long *this_pid = file->private_data;
-+
-+ r = snprintf(buf, sizeof(buf), "%lu\n", *this_pid);
-+ return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
-+}
-+
-+static ssize_t do_pid(struct file *file, const char __user *ubuf,
-+ size_t cnt, loff_t *ppos)
-+{
-+ char buf[64];
-+ unsigned long pid;
-+ unsigned long *this_pid = file->private_data;
-+
-+ if (cnt >= sizeof(buf))
-+ return -EINVAL;
-+
-+ if (copy_from_user(&buf, ubuf, cnt))
-+ return -EFAULT;
-+
-+ buf[cnt] = '\0';
-+
-+ if (kstrtoul(buf, 10, &pid))
-+ return -EINVAL;
-+
-+ *this_pid = pid;
-+
-+ return cnt;
-+}
-+#endif
-+
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+static ssize_t
-+show_maxlatproc(struct file *file, char __user *ubuf, size_t cnt, loff_t *ppos)
-+{
-+ int r;
-+ struct maxlatproc_data *mp = file->private_data;
-+ int strmaxlen = (TASK_COMM_LEN * 2) + (8 * 8);
-+ unsigned long long t;
-+ unsigned long usecs, secs;
-+ char *buf;
-+
-+ if (mp->pid == -1 || mp->current_pid == -1) {
-+ buf = "(none)\n";
-+ return simple_read_from_buffer(ubuf, cnt, ppos, buf,
-+ strlen(buf));
-+ }
-+
-+ buf = kmalloc(strmaxlen, GFP_KERNEL);
-+ if (buf == NULL)
-+ return -ENOMEM;
-+
-+ t = ns2usecs(mp->timestamp);
-+ usecs = do_div(t, USEC_PER_SEC);
-+ secs = (unsigned long) t;
-+ r = snprintf(buf, strmaxlen,
-+ "%d %d %ld (%ld) %s <- %d %d %s %lu.%06lu\n", mp->pid,
-+ MAX_RT_PRIO-1 - mp->prio, mp->latency, mp->timeroffset, mp->comm,
-+ mp->current_pid, MAX_RT_PRIO-1 - mp->current_prio, mp->current_comm,
-+ secs, usecs);
-+ r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
-+ kfree(buf);
-+ return r;
-+}
-+#endif
-+
-+static ssize_t
-+show_enable(struct file *file, char __user *ubuf, size_t cnt, loff_t *ppos)
-+{
-+ char buf[64];
-+ struct enable_data *ed = file->private_data;
-+ int r;
-+
-+ r = snprintf(buf, sizeof(buf), "%d\n", ed->enabled);
-+ return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
-+}
-+
-+static ssize_t
-+do_enable(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos)
-+{
-+ char buf[64];
-+ long enable;
-+ struct enable_data *ed = file->private_data;
-+
-+ if (cnt >= sizeof(buf))
-+ return -EINVAL;
-+
-+ if (copy_from_user(&buf, ubuf, cnt))
-+ return -EFAULT;
-+
-+ buf[cnt] = 0;
-+
-+ if (kstrtoul(buf, 10, &enable))
-+ return -EINVAL;
-+
-+ if ((enable && ed->enabled) || (!enable && !ed->enabled))
-+ return cnt;
-+
-+ if (enable) {
-+ int ret;
-+
-+ switch (ed->latency_type) {
-+#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST)
-+ case PREEMPTIRQSOFF_LATENCY:
-+ ret = register_trace_preemptirqsoff_hist(
-+ probe_preemptirqsoff_hist, NULL);
-+ if (ret) {
-+ pr_info("wakeup trace: Couldn't assign "
-+ "probe_preemptirqsoff_hist "
-+ "to trace_preemptirqsoff_hist\n");
-+ return ret;
-+ }
-+ break;
-+#endif
-+#ifdef CONFIG_WAKEUP_LATENCY_HIST
-+ case WAKEUP_LATENCY:
-+ ret = register_trace_sched_wakeup(
-+ probe_wakeup_latency_hist_start, NULL);
-+ if (ret) {
-+ pr_info("wakeup trace: Couldn't assign "
-+ "probe_wakeup_latency_hist_start "
-+ "to trace_sched_wakeup\n");
-+ return ret;
-+ }
-+ ret = register_trace_sched_wakeup_new(
-+ probe_wakeup_latency_hist_start, NULL);
-+ if (ret) {
-+ pr_info("wakeup trace: Couldn't assign "
-+ "probe_wakeup_latency_hist_start "
-+ "to trace_sched_wakeup_new\n");
-+ unregister_trace_sched_wakeup(
-+ probe_wakeup_latency_hist_start, NULL);
-+ return ret;
-+ }
-+ ret = register_trace_sched_switch(
-+ probe_wakeup_latency_hist_stop, NULL);
-+ if (ret) {
-+ pr_info("wakeup trace: Couldn't assign "
-+ "probe_wakeup_latency_hist_stop "
-+ "to trace_sched_switch\n");
-+ unregister_trace_sched_wakeup(
-+ probe_wakeup_latency_hist_start, NULL);
-+ unregister_trace_sched_wakeup_new(
-+ probe_wakeup_latency_hist_start, NULL);
-+ return ret;
-+ }
-+ ret = register_trace_sched_migrate_task(
-+ probe_sched_migrate_task, NULL);
-+ if (ret) {
-+ pr_info("wakeup trace: Couldn't assign "
-+ "probe_sched_migrate_task "
-+ "to trace_sched_migrate_task\n");
-+ unregister_trace_sched_wakeup(
-+ probe_wakeup_latency_hist_start, NULL);
-+ unregister_trace_sched_wakeup_new(
-+ probe_wakeup_latency_hist_start, NULL);
-+ unregister_trace_sched_switch(
-+ probe_wakeup_latency_hist_stop, NULL);
-+ return ret;
-+ }
-+ break;
-+#endif
-+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
-+ case MISSED_TIMER_OFFSETS:
-+ ret = register_trace_hrtimer_interrupt(
-+ probe_hrtimer_interrupt, NULL);
-+ if (ret) {
-+ pr_info("wakeup trace: Couldn't assign "
-+ "probe_hrtimer_interrupt "
-+ "to trace_hrtimer_interrupt\n");
-+ return ret;
-+ }
-+ break;
-+#endif
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+ case TIMERANDWAKEUP_LATENCY:
-+ if (!wakeup_latency_enabled_data.enabled ||
-+ !missed_timer_offsets_enabled_data.enabled)
-+ return -EINVAL;
-+ break;
-+#endif
-+ default:
-+ break;
-+ }
-+ } else {
-+ switch (ed->latency_type) {
-+#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST)
-+ case PREEMPTIRQSOFF_LATENCY:
-+ {
-+ int cpu;
-+
-+ unregister_trace_preemptirqsoff_hist(
-+ probe_preemptirqsoff_hist, NULL);
-+ for_each_online_cpu(cpu) {
-+#ifdef CONFIG_INTERRUPT_OFF_HIST
-+ per_cpu(hist_irqsoff_counting,
-+ cpu) = 0;
-+#endif
-+#ifdef CONFIG_PREEMPT_OFF_HIST
-+ per_cpu(hist_preemptoff_counting,
-+ cpu) = 0;
-+#endif
-+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
-+ per_cpu(hist_preemptirqsoff_counting,
-+ cpu) = 0;
-+#endif
-+ }
-+ }
-+ break;
-+#endif
-+#ifdef CONFIG_WAKEUP_LATENCY_HIST
-+ case WAKEUP_LATENCY:
-+ {
-+ int cpu;
-+
-+ unregister_trace_sched_wakeup(
-+ probe_wakeup_latency_hist_start, NULL);
-+ unregister_trace_sched_wakeup_new(
-+ probe_wakeup_latency_hist_start, NULL);
-+ unregister_trace_sched_switch(
-+ probe_wakeup_latency_hist_stop, NULL);
-+ unregister_trace_sched_migrate_task(
-+ probe_sched_migrate_task, NULL);
-+
-+ for_each_online_cpu(cpu) {
-+ per_cpu(wakeup_task, cpu) = NULL;
-+ per_cpu(wakeup_sharedprio, cpu) = 0;
-+ }
-+ }
-+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
-+ timerandwakeup_enabled_data.enabled = 0;
-+#endif
-+ break;
-+#endif
-+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
-+ case MISSED_TIMER_OFFSETS:
-+ unregister_trace_hrtimer_interrupt(
-+ probe_hrtimer_interrupt, NULL);
-+#ifdef CONFIG_WAKEUP_LATENCY_HIST
-+ timerandwakeup_enabled_data.enabled = 0;
-+#endif
-+ break;
-+#endif
-+ default:
-+ break;
-+ }
-+ }
-+ ed->enabled = enable;
-+ return cnt;
-+}
-+
-+static const struct file_operations latency_hist_reset_fops = {
-+ .open = tracing_open_generic,
-+ .write = latency_hist_reset,
-+};
-+
-+static const struct file_operations enable_fops = {
-+ .open = tracing_open_generic,
-+ .read = show_enable,
-+ .write = do_enable,
-+};
-+
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+static const struct file_operations pid_fops = {
-+ .open = tracing_open_generic,
-+ .read = show_pid,
-+ .write = do_pid,
-+};
-+
-+static const struct file_operations maxlatproc_fops = {
-+ .open = tracing_open_generic,
-+ .read = show_maxlatproc,
-+};
-+#endif
-+
-+#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST)
-+static notrace void probe_preemptirqsoff_hist(void *v, int reason,
-+ int starthist)
-+{
-+ int cpu = raw_smp_processor_id();
-+ int time_set = 0;
-+
-+ if (starthist) {
-+ cycle_t uninitialized_var(start);
-+
-+ if (!preempt_count() && !irqs_disabled())
-+ return;
-+
-+#ifdef CONFIG_INTERRUPT_OFF_HIST
-+ if ((reason == IRQS_OFF || reason == TRACE_START) &&
-+ !per_cpu(hist_irqsoff_counting, cpu)) {
-+ per_cpu(hist_irqsoff_counting, cpu) = 1;
-+ start = ftrace_now(cpu);
-+ time_set++;
-+ per_cpu(hist_irqsoff_start, cpu) = start;
-+ }
-+#endif
-+
-+#ifdef CONFIG_PREEMPT_OFF_HIST
-+ if ((reason == PREEMPT_OFF || reason == TRACE_START) &&
-+ !per_cpu(hist_preemptoff_counting, cpu)) {
-+ per_cpu(hist_preemptoff_counting, cpu) = 1;
-+ if (!(time_set++))
-+ start = ftrace_now(cpu);
-+ per_cpu(hist_preemptoff_start, cpu) = start;
-+ }
-+#endif
-+
-+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
-+ if (per_cpu(hist_irqsoff_counting, cpu) &&
-+ per_cpu(hist_preemptoff_counting, cpu) &&
-+ !per_cpu(hist_preemptirqsoff_counting, cpu)) {
-+ per_cpu(hist_preemptirqsoff_counting, cpu) = 1;
-+ if (!time_set)
-+ start = ftrace_now(cpu);
-+ per_cpu(hist_preemptirqsoff_start, cpu) = start;
-+ }
-+#endif
-+ } else {
-+ cycle_t uninitialized_var(stop);
-+
-+#ifdef CONFIG_INTERRUPT_OFF_HIST
-+ if ((reason == IRQS_ON || reason == TRACE_STOP) &&
-+ per_cpu(hist_irqsoff_counting, cpu)) {
-+ cycle_t start = per_cpu(hist_irqsoff_start, cpu);
-+
-+ stop = ftrace_now(cpu);
-+ time_set++;
-+ if (start) {
-+ long latency = ((long) (stop - start)) /
-+ NSECS_PER_USECS;
-+
-+ latency_hist(IRQSOFF_LATENCY, cpu, latency, 0,
-+ stop, NULL);
-+ }
-+ per_cpu(hist_irqsoff_counting, cpu) = 0;
-+ }
-+#endif
-+
-+#ifdef CONFIG_PREEMPT_OFF_HIST
-+ if ((reason == PREEMPT_ON || reason == TRACE_STOP) &&
-+ per_cpu(hist_preemptoff_counting, cpu)) {
-+ cycle_t start = per_cpu(hist_preemptoff_start, cpu);
-+
-+ if (!(time_set++))
-+ stop = ftrace_now(cpu);
-+ if (start) {
-+ long latency = ((long) (stop - start)) /
-+ NSECS_PER_USECS;
-+
-+ latency_hist(PREEMPTOFF_LATENCY, cpu, latency,
-+ 0, stop, NULL);
-+ }
-+ per_cpu(hist_preemptoff_counting, cpu) = 0;
-+ }
-+#endif
-+
-+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
-+ if ((!per_cpu(hist_irqsoff_counting, cpu) ||
-+ !per_cpu(hist_preemptoff_counting, cpu)) &&
-+ per_cpu(hist_preemptirqsoff_counting, cpu)) {
-+ cycle_t start = per_cpu(hist_preemptirqsoff_start, cpu);
-+
-+ if (!time_set)
-+ stop = ftrace_now(cpu);
-+ if (start) {
-+ long latency = ((long) (stop - start)) /
-+ NSECS_PER_USECS;
-+
-+ latency_hist(PREEMPTIRQSOFF_LATENCY, cpu,
-+ latency, 0, stop, NULL);
-+ }
-+ per_cpu(hist_preemptirqsoff_counting, cpu) = 0;
-+ }
-+#endif
-+ }
-+}
-+#endif
-+
-+#ifdef CONFIG_WAKEUP_LATENCY_HIST
-+static DEFINE_RAW_SPINLOCK(wakeup_lock);
-+static notrace void probe_sched_migrate_task(void *v, struct task_struct *task,
-+ int cpu)
-+{
-+ int old_cpu = task_cpu(task);
-+
-+ if (cpu != old_cpu) {
-+ unsigned long flags;
-+ struct task_struct *cpu_wakeup_task;
-+
-+ raw_spin_lock_irqsave(&wakeup_lock, flags);
-+
-+ cpu_wakeup_task = per_cpu(wakeup_task, old_cpu);
-+ if (task == cpu_wakeup_task) {
-+ put_task_struct(cpu_wakeup_task);
-+ per_cpu(wakeup_task, old_cpu) = NULL;
-+ cpu_wakeup_task = per_cpu(wakeup_task, cpu) = task;
-+ get_task_struct(cpu_wakeup_task);
-+ }
-+
-+ raw_spin_unlock_irqrestore(&wakeup_lock, flags);
-+ }
-+}
-+
-+static notrace void probe_wakeup_latency_hist_start(void *v,
-+ struct task_struct *p, int success)
-+{
-+ unsigned long flags;
-+ struct task_struct *curr = current;
-+ int cpu = task_cpu(p);
-+ struct task_struct *cpu_wakeup_task;
-+
-+ raw_spin_lock_irqsave(&wakeup_lock, flags);
-+
-+ cpu_wakeup_task = per_cpu(wakeup_task, cpu);
-+
-+ if (wakeup_pid) {
-+ if ((cpu_wakeup_task && p->prio == cpu_wakeup_task->prio) ||
-+ p->prio == curr->prio)
-+ per_cpu(wakeup_sharedprio, cpu) = 1;
-+ if (likely(wakeup_pid != task_pid_nr(p)))
-+ goto out;
-+ } else {
-+ if (likely(!rt_task(p)) ||
-+ (cpu_wakeup_task && p->prio > cpu_wakeup_task->prio) ||
-+ p->prio > curr->prio)
-+ goto out;
-+ if ((cpu_wakeup_task && p->prio == cpu_wakeup_task->prio) ||
-+ p->prio == curr->prio)
-+ per_cpu(wakeup_sharedprio, cpu) = 1;
-+ }
-+
-+ if (cpu_wakeup_task)
-+ put_task_struct(cpu_wakeup_task);
-+ cpu_wakeup_task = per_cpu(wakeup_task, cpu) = p;
-+ get_task_struct(cpu_wakeup_task);
-+ cpu_wakeup_task->preempt_timestamp_hist =
-+ ftrace_now(raw_smp_processor_id());
-+out:
-+ raw_spin_unlock_irqrestore(&wakeup_lock, flags);
-+}
-+
-+static notrace void probe_wakeup_latency_hist_stop(void *v,
-+ struct task_struct *prev, struct task_struct *next)
-+{
-+ unsigned long flags;
-+ int cpu = task_cpu(next);
-+ long latency;
-+ cycle_t stop;
-+ struct task_struct *cpu_wakeup_task;
-+
-+ raw_spin_lock_irqsave(&wakeup_lock, flags);
-+
-+ cpu_wakeup_task = per_cpu(wakeup_task, cpu);
-+
-+ if (cpu_wakeup_task == NULL)
-+ goto out;
-+
-+ /* Already running? */
-+ if (unlikely(current == cpu_wakeup_task))
-+ goto out_reset;
-+
-+ if (next != cpu_wakeup_task) {
-+ if (next->prio < cpu_wakeup_task->prio)
-+ goto out_reset;
-+
-+ if (next->prio == cpu_wakeup_task->prio)
-+ per_cpu(wakeup_sharedprio, cpu) = 1;
-+
-+ goto out;
-+ }
-+
-+ if (current->prio == cpu_wakeup_task->prio)
-+ per_cpu(wakeup_sharedprio, cpu) = 1;
-+
-+ /*
-+ * The task we are waiting for is about to be switched to.
-+ * Calculate latency and store it in histogram.
-+ */
-+ stop = ftrace_now(raw_smp_processor_id());
-+
-+ latency = ((long) (stop - next->preempt_timestamp_hist)) /
-+ NSECS_PER_USECS;
-+
-+ if (per_cpu(wakeup_sharedprio, cpu)) {
-+ latency_hist(WAKEUP_LATENCY_SHAREDPRIO, cpu, latency, 0, stop,
-+ next);
-+ per_cpu(wakeup_sharedprio, cpu) = 0;
-+ } else {
-+ latency_hist(WAKEUP_LATENCY, cpu, latency, 0, stop, next);
-+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
-+ if (timerandwakeup_enabled_data.enabled) {
-+ latency_hist(TIMERANDWAKEUP_LATENCY, cpu,
-+ next->timer_offset + latency, next->timer_offset,
-+ stop, next);
-+ }
-+#endif
-+ }
-+
-+out_reset:
-+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
-+ next->timer_offset = 0;
-+#endif
-+ put_task_struct(cpu_wakeup_task);
-+ per_cpu(wakeup_task, cpu) = NULL;
-+out:
-+ raw_spin_unlock_irqrestore(&wakeup_lock, flags);
-+}
-+#endif
-+
-+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
-+static notrace void probe_hrtimer_interrupt(void *v, int cpu,
-+ long long latency_ns, struct task_struct *curr,
-+ struct task_struct *task)
-+{
-+ if (latency_ns <= 0 && task != NULL && rt_task(task) &&
-+ (task->prio < curr->prio ||
-+ (task->prio == curr->prio &&
-+ !cpumask_test_cpu(cpu, &task->cpus_allowed)))) {
-+ long latency;
-+ cycle_t now;
-+
-+ if (missed_timer_offsets_pid) {
-+ if (likely(missed_timer_offsets_pid !=
-+ task_pid_nr(task)))
-+ return;
-+ }
-+
-+ now = ftrace_now(cpu);
-+ latency = (long) div_s64(-latency_ns, NSECS_PER_USECS);
-+ latency_hist(MISSED_TIMER_OFFSETS, cpu, latency, latency, now,
-+ task);
-+#ifdef CONFIG_WAKEUP_LATENCY_HIST
-+ task->timer_offset = latency;
-+#endif
-+ }
-+}
-+#endif
-+
-+static __init int latency_hist_init(void)
-+{
-+ struct dentry *latency_hist_root = NULL;
-+ struct dentry *dentry;
-+#ifdef CONFIG_WAKEUP_LATENCY_HIST
-+ struct dentry *dentry_sharedprio;
-+#endif
-+ struct dentry *entry;
-+ struct dentry *enable_root;
-+ int i = 0;
-+ struct hist_data *my_hist;
-+ char name[64];
-+ char *cpufmt = "CPU%d";
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+ char *cpufmt_maxlatproc = "max_latency-CPU%d";
-+ struct maxlatproc_data *mp = NULL;
-+#endif
-+
-+ dentry = tracing_init_dentry();
-+ latency_hist_root = debugfs_create_dir(latency_hist_dir_root, dentry);
-+ enable_root = debugfs_create_dir("enable", latency_hist_root);
-+
-+#ifdef CONFIG_INTERRUPT_OFF_HIST
-+ dentry = debugfs_create_dir(irqsoff_hist_dir, latency_hist_root);
-+ for_each_possible_cpu(i) {
-+ sprintf(name, cpufmt, i);
-+ entry = debugfs_create_file(name, 0444, dentry,
-+ &per_cpu(irqsoff_hist, i), &latency_hist_fops);
-+ my_hist = &per_cpu(irqsoff_hist, i);
-+ atomic_set(&my_hist->hist_mode, 1);
-+ my_hist->min_lat = LONG_MAX;
-+ }
-+ entry = debugfs_create_file("reset", 0644, dentry,
-+ (void *)IRQSOFF_LATENCY, &latency_hist_reset_fops);
-+#endif
-+
-+#ifdef CONFIG_PREEMPT_OFF_HIST
-+ dentry = debugfs_create_dir(preemptoff_hist_dir,
-+ latency_hist_root);
-+ for_each_possible_cpu(i) {
-+ sprintf(name, cpufmt, i);
-+ entry = debugfs_create_file(name, 0444, dentry,
-+ &per_cpu(preemptoff_hist, i), &latency_hist_fops);
-+ my_hist = &per_cpu(preemptoff_hist, i);
-+ atomic_set(&my_hist->hist_mode, 1);
-+ my_hist->min_lat = LONG_MAX;
-+ }
-+ entry = debugfs_create_file("reset", 0644, dentry,
-+ (void *)PREEMPTOFF_LATENCY, &latency_hist_reset_fops);
-+#endif
-+
-+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
-+ dentry = debugfs_create_dir(preemptirqsoff_hist_dir,
-+ latency_hist_root);
-+ for_each_possible_cpu(i) {
-+ sprintf(name, cpufmt, i);
-+ entry = debugfs_create_file(name, 0444, dentry,
-+ &per_cpu(preemptirqsoff_hist, i), &latency_hist_fops);
-+ my_hist = &per_cpu(preemptirqsoff_hist, i);
-+ atomic_set(&my_hist->hist_mode, 1);
-+ my_hist->min_lat = LONG_MAX;
-+ }
-+ entry = debugfs_create_file("reset", 0644, dentry,
-+ (void *)PREEMPTIRQSOFF_LATENCY, &latency_hist_reset_fops);
-+#endif
-+
-+#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST)
-+ entry = debugfs_create_file("preemptirqsoff", 0644,
-+ enable_root, (void *)&preemptirqsoff_enabled_data,
-+ &enable_fops);
-+#endif
-+
-+#ifdef CONFIG_WAKEUP_LATENCY_HIST
-+ dentry = debugfs_create_dir(wakeup_latency_hist_dir,
-+ latency_hist_root);
-+ dentry_sharedprio = debugfs_create_dir(
-+ wakeup_latency_hist_dir_sharedprio, dentry);
-+ for_each_possible_cpu(i) {
-+ sprintf(name, cpufmt, i);
-+
-+ entry = debugfs_create_file(name, 0444, dentry,
-+ &per_cpu(wakeup_latency_hist, i),
-+ &latency_hist_fops);
-+ my_hist = &per_cpu(wakeup_latency_hist, i);
-+ atomic_set(&my_hist->hist_mode, 1);
-+ my_hist->min_lat = LONG_MAX;
-+
-+ entry = debugfs_create_file(name, 0444, dentry_sharedprio,
-+ &per_cpu(wakeup_latency_hist_sharedprio, i),
-+ &latency_hist_fops);
-+ my_hist = &per_cpu(wakeup_latency_hist_sharedprio, i);
-+ atomic_set(&my_hist->hist_mode, 1);
-+ my_hist->min_lat = LONG_MAX;
-+
-+ sprintf(name, cpufmt_maxlatproc, i);
-+
-+ mp = &per_cpu(wakeup_maxlatproc, i);
-+ entry = debugfs_create_file(name, 0444, dentry, mp,
-+ &maxlatproc_fops);
-+ clear_maxlatprocdata(mp);
-+
-+ mp = &per_cpu(wakeup_maxlatproc_sharedprio, i);
-+ entry = debugfs_create_file(name, 0444, dentry_sharedprio, mp,
-+ &maxlatproc_fops);
-+ clear_maxlatprocdata(mp);
-+ }
-+ entry = debugfs_create_file("pid", 0644, dentry,
-+ (void *)&wakeup_pid, &pid_fops);
-+ entry = debugfs_create_file("reset", 0644, dentry,
-+ (void *)WAKEUP_LATENCY, &latency_hist_reset_fops);
-+ entry = debugfs_create_file("reset", 0644, dentry_sharedprio,
-+ (void *)WAKEUP_LATENCY_SHAREDPRIO, &latency_hist_reset_fops);
-+ entry = debugfs_create_file("wakeup", 0644,
-+ enable_root, (void *)&wakeup_latency_enabled_data,
-+ &enable_fops);
-+#endif
-+
-+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
-+ dentry = debugfs_create_dir(missed_timer_offsets_dir,
-+ latency_hist_root);
-+ for_each_possible_cpu(i) {
-+ sprintf(name, cpufmt, i);
-+ entry = debugfs_create_file(name, 0444, dentry,
-+ &per_cpu(missed_timer_offsets, i), &latency_hist_fops);
-+ my_hist = &per_cpu(missed_timer_offsets, i);
-+ atomic_set(&my_hist->hist_mode, 1);
-+ my_hist->min_lat = LONG_MAX;
-+
-+ sprintf(name, cpufmt_maxlatproc, i);
-+ mp = &per_cpu(missed_timer_offsets_maxlatproc, i);
-+ entry = debugfs_create_file(name, 0444, dentry, mp,
-+ &maxlatproc_fops);
-+ clear_maxlatprocdata(mp);
-+ }
-+ entry = debugfs_create_file("pid", 0644, dentry,
-+ (void *)&missed_timer_offsets_pid, &pid_fops);
-+ entry = debugfs_create_file("reset", 0644, dentry,
-+ (void *)MISSED_TIMER_OFFSETS, &latency_hist_reset_fops);
-+ entry = debugfs_create_file("missed_timer_offsets", 0644,
-+ enable_root, (void *)&missed_timer_offsets_enabled_data,
-+ &enable_fops);
-+#endif
-+
-+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
-+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
-+ dentry = debugfs_create_dir(timerandwakeup_latency_hist_dir,
-+ latency_hist_root);
-+ for_each_possible_cpu(i) {
-+ sprintf(name, cpufmt, i);
-+ entry = debugfs_create_file(name, 0444, dentry,
-+ &per_cpu(timerandwakeup_latency_hist, i),
-+ &latency_hist_fops);
-+ my_hist = &per_cpu(timerandwakeup_latency_hist, i);
-+ atomic_set(&my_hist->hist_mode, 1);
-+ my_hist->min_lat = LONG_MAX;
-+
-+ sprintf(name, cpufmt_maxlatproc, i);
-+ mp = &per_cpu(timerandwakeup_maxlatproc, i);
-+ entry = debugfs_create_file(name, 0444, dentry, mp,
-+ &maxlatproc_fops);
-+ clear_maxlatprocdata(mp);
-+ }
-+ entry = debugfs_create_file("reset", 0644, dentry,
-+ (void *)TIMERANDWAKEUP_LATENCY, &latency_hist_reset_fops);
-+ entry = debugfs_create_file("timerandwakeup", 0644,
-+ enable_root, (void *)&timerandwakeup_enabled_data,
-+ &enable_fops);
-+#endif
-+ return 0;
-+}
-+
-+device_initcall(latency_hist_init);
-Index: linux-stable/kernel/trace/trace_irqsoff.c
-===================================================================
---- linux-stable.orig/kernel/trace/trace_irqsoff.c
-+++ linux-stable/kernel/trace/trace_irqsoff.c
-@@ -17,6 +17,7 @@
- #include <linux/fs.h>
-
- #include "trace.h"
-+#include <trace/events/hist.h>
-
- static struct trace_array *irqsoff_trace __read_mostly;
- static int tracer_enabled __read_mostly;
-@@ -439,11 +440,13 @@ void start_critical_timings(void)
- {
- if (preempt_trace() || irq_trace())
- start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
-+ trace_preemptirqsoff_hist(TRACE_START, 1);
- }
- EXPORT_SYMBOL_GPL(start_critical_timings);
-
- void stop_critical_timings(void)
- {
-+ trace_preemptirqsoff_hist(TRACE_STOP, 0);
- if (preempt_trace() || irq_trace())
- stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
- }
-@@ -453,6 +456,7 @@ EXPORT_SYMBOL_GPL(stop_critical_timings)
- #ifdef CONFIG_PROVE_LOCKING
- void time_hardirqs_on(unsigned long a0, unsigned long a1)
- {
-+ trace_preemptirqsoff_hist(IRQS_ON, 0);
- if (!preempt_trace() && irq_trace())
- stop_critical_timing(a0, a1);
- }
-@@ -461,6 +465,7 @@ void time_hardirqs_off(unsigned long a0,
- {
- if (!preempt_trace() && irq_trace())
- start_critical_timing(a0, a1);
-+ trace_preemptirqsoff_hist(IRQS_OFF, 1);
- }
-
- #else /* !CONFIG_PROVE_LOCKING */
-@@ -486,6 +491,7 @@ inline void print_irqtrace_events(struct
- */
- void trace_hardirqs_on(void)
- {
-+ trace_preemptirqsoff_hist(IRQS_ON, 0);
- if (!preempt_trace() && irq_trace())
- stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
- }
-@@ -495,11 +501,13 @@ void trace_hardirqs_off(void)
- {
- if (!preempt_trace() && irq_trace())
- start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
-+ trace_preemptirqsoff_hist(IRQS_OFF, 1);
- }
- EXPORT_SYMBOL(trace_hardirqs_off);
-
- void trace_hardirqs_on_caller(unsigned long caller_addr)
- {
-+ trace_preemptirqsoff_hist(IRQS_ON, 0);
- if (!preempt_trace() && irq_trace())
- stop_critical_timing(CALLER_ADDR0, caller_addr);
- }
-@@ -509,6 +517,7 @@ void trace_hardirqs_off_caller(unsigned
- {
- if (!preempt_trace() && irq_trace())
- start_critical_timing(CALLER_ADDR0, caller_addr);
-+ trace_preemptirqsoff_hist(IRQS_OFF, 1);
- }
- EXPORT_SYMBOL(trace_hardirqs_off_caller);
-
-@@ -518,12 +527,14 @@ EXPORT_SYMBOL(trace_hardirqs_off_caller)
- #ifdef CONFIG_PREEMPT_TRACER
- void trace_preempt_on(unsigned long a0, unsigned long a1)
- {
-+ trace_preemptirqsoff_hist(PREEMPT_ON, 0);
- if (preempt_trace() && !irq_trace())
- stop_critical_timing(a0, a1);
- }
-
- void trace_preempt_off(unsigned long a0, unsigned long a1)
- {
-+ trace_preemptirqsoff_hist(PREEMPT_ON, 1);
- if (preempt_trace() && !irq_trace())
- start_critical_timing(a0, a1);
- }
-Index: linux-stable/Documentation/hwlat_detector.txt
-===================================================================
---- /dev/null
-+++ linux-stable/Documentation/hwlat_detector.txt
-@@ -0,0 +1,64 @@
-+Introduction:
-+-------------
-+
-+The module hwlat_detector is a special purpose kernel module that is used to
-+detect large system latencies induced by the behavior of certain underlying
-+hardware or firmware, independent of Linux itself. The code was developed
-+originally to detect SMIs (System Management Interrupts) on x86 systems,
-+however there is nothing x86 specific about this patchset. It was
-+originally written for use by the "RT" patch since the Real Time
-+kernel is highly latency sensitive.
-+
-+SMIs are usually not serviced by the Linux kernel, which typically does not
-+even know that they are occuring. SMIs are instead are set up by BIOS code
-+and are serviced by BIOS code, usually for "critical" events such as
-+management of thermal sensors and fans. Sometimes though, SMIs are used for
-+other tasks and those tasks can spend an inordinate amount of time in the
-+handler (sometimes measured in milliseconds). Obviously this is a problem if
-+you are trying to keep event service latencies down in the microsecond range.
-+
-+The hardware latency detector works by hogging all of the cpus for configurable
-+amounts of time (by calling stop_machine()), polling the CPU Time Stamp Counter
-+for some period, then looking for gaps in the TSC data. Any gap indicates a
-+time when the polling was interrupted and since the machine is stopped and
-+interrupts turned off the only thing that could do that would be an SMI.
-+
-+Note that the SMI detector should *NEVER* be used in a production environment.
-+It is intended to be run manually to determine if the hardware platform has a
-+problem with long system firmware service routines.
-+
-+Usage:
-+------
-+
-+Loading the module hwlat_detector passing the parameter "enabled=1" (or by
-+setting the "enable" entry in "hwlat_detector" debugfs toggled on) is the only
-+step required to start the hwlat_detector. It is possible to redefine the
-+threshold in microseconds (us) above which latency spikes will be taken
-+into account (parameter "threshold=").
-+
-+Example:
-+
-+ # modprobe hwlat_detector enabled=1 threshold=100
-+
-+After the module is loaded, it creates a directory named "hwlat_detector" under
-+the debugfs mountpoint, "/debug/hwlat_detector" for this text. It is necessary
-+to have debugfs mounted, which might be on /sys/debug on your system.
-+
-+The /debug/hwlat_detector interface contains the following files:
-+
-+count - number of latency spikes observed since last reset
-+enable - a global enable/disable toggle (0/1), resets count
-+max - maximum hardware latency actually observed (usecs)
-+sample - a pipe from which to read current raw sample data
-+ in the format <timestamp> <latency observed usecs>
-+ (can be opened O_NONBLOCK for a single sample)
-+threshold - minimum latency value to be considered (usecs)
-+width - time period to sample with CPUs held (usecs)
-+ must be less than the total window size (enforced)
-+window - total period of sampling, width being inside (usecs)
-+
-+By default we will set width to 500,000 and window to 1,000,000, meaning that
-+we will sample every 1,000,000 usecs (1s) for 500,000 usecs (0.5s). If we
-+observe any latencies that exceed the threshold (initially 100 usecs),
-+then we write to a global sample ring buffer of 8K samples, which is
-+consumed by reading from the "sample" (pipe) debugfs file interface.
-Index: linux-stable/drivers/misc/Makefile
-===================================================================
---- linux-stable.orig/drivers/misc/Makefile
-+++ linux-stable/drivers/misc/Makefile
-@@ -39,6 +39,7 @@ obj-$(CONFIG_C2PORT) += c2port/
- obj-$(CONFIG_HMC6352) += hmc6352.o
- obj-y += eeprom/
- obj-y += cb710/
-+obj-$(CONFIG_HWLAT_DETECTOR) += hwlat_detector.o
- obj-$(CONFIG_SPEAR13XX_PCIE_GADGET) += spear13xx_pcie_gadget.o
- obj-$(CONFIG_VMWARE_BALLOON) += vmw_balloon.o
- obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o
-Index: linux-stable/drivers/misc/hwlat_detector.c
-===================================================================
---- /dev/null
-+++ linux-stable/drivers/misc/hwlat_detector.c
-@@ -0,0 +1,1240 @@
-+/*
-+ * hwlat_detector.c - A simple Hardware Latency detector.
-+ *
-+ * Use this module to detect large system latencies induced by the behavior of
-+ * certain underlying system hardware or firmware, independent of Linux itself.
-+ * The code was developed originally to detect the presence of SMIs on Intel
-+ * and AMD systems, although there is no dependency upon x86 herein.
-+ *
-+ * The classical example usage of this module is in detecting the presence of
-+ * SMIs or System Management Interrupts on Intel and AMD systems. An SMI is a
-+ * somewhat special form of hardware interrupt spawned from earlier CPU debug
-+ * modes in which the (BIOS/EFI/etc.) firmware arranges for the South Bridge
-+ * LPC (or other device) to generate a special interrupt under certain
-+ * circumstances, for example, upon expiration of a special SMI timer device,
-+ * due to certain external thermal readings, on certain I/O address accesses,
-+ * and other situations. An SMI hits a special CPU pin, triggers a special
-+ * SMI mode (complete with special memory map), and the OS is unaware.
-+ *
-+ * Although certain hardware-inducing latencies are necessary (for example,
-+ * a modern system often requires an SMI handler for correct thermal control
-+ * and remote management) they can wreak havoc upon any OS-level performance
-+ * guarantees toward low-latency, especially when the OS is not even made
-+ * aware of the presence of these interrupts. For this reason, we need a
-+ * somewhat brute force mechanism to detect these interrupts. In this case,
-+ * we do it by hogging all of the CPU(s) for configurable timer intervals,
-+ * sampling the built-in CPU timer, looking for discontiguous readings.
-+ *
-+ * WARNING: This implementation necessarily introduces latencies. Therefore,
-+ * you should NEVER use this module in a production environment
-+ * requiring any kind of low-latency performance guarantee(s).
-+ *
-+ * Copyright (C) 2008-2009 Jon Masters, Red Hat, Inc. <jcm@redhat.com>
-+ *
-+ * Includes useful feedback from Clark Williams <clark@redhat.com>
-+ *
-+ * This file is licensed under the terms of the GNU General Public
-+ * License version 2. This program is licensed "as is" without any
-+ * warranty of any kind, whether express or implied.
-+ */
-+
-+#include <linux/module.h>
-+#include <linux/init.h>
-+#include <linux/ring_buffer.h>
-+#include <linux/time.h>
-+#include <linux/hrtimer.h>
-+#include <linux/kthread.h>
-+#include <linux/debugfs.h>
-+#include <linux/seq_file.h>
-+#include <linux/uaccess.h>
-+#include <linux/version.h>
-+#include <linux/delay.h>
-+#include <linux/slab.h>
-+#include <linux/trace_clock.h>
-+
-+#define BUF_SIZE_DEFAULT 262144UL /* 8K*(sizeof(entry)) */
-+#define BUF_FLAGS (RB_FL_OVERWRITE) /* no block on full */
-+#define U64STR_SIZE 22 /* 20 digits max */
-+
-+#define VERSION "1.0.0"
-+#define BANNER "hwlat_detector: "
-+#define DRVNAME "hwlat_detector"
-+#define DEFAULT_SAMPLE_WINDOW 1000000 /* 1s */
-+#define DEFAULT_SAMPLE_WIDTH 500000 /* 0.5s */
-+#define DEFAULT_LAT_THRESHOLD 10 /* 10us */
-+
-+/* Module metadata */
-+
-+MODULE_LICENSE("GPL");
-+MODULE_AUTHOR("Jon Masters <jcm@redhat.com>");
-+MODULE_DESCRIPTION("A simple hardware latency detector");
-+MODULE_VERSION(VERSION);
-+
-+/* Module parameters */
-+
-+static int debug;
-+static int enabled;
-+static int threshold;
-+
-+module_param(debug, int, 0); /* enable debug */
-+module_param(enabled, int, 0); /* enable detector */
-+module_param(threshold, int, 0); /* latency threshold */
-+
-+/* Buffering and sampling */
-+
-+static struct ring_buffer *ring_buffer; /* sample buffer */
-+static DEFINE_MUTEX(ring_buffer_mutex); /* lock changes */
-+static unsigned long buf_size = BUF_SIZE_DEFAULT;
-+static struct task_struct *kthread; /* sampling thread */
-+
-+/* DebugFS filesystem entries */
-+
-+static struct dentry *debug_dir; /* debugfs directory */
-+static struct dentry *debug_max; /* maximum TSC delta */
-+static struct dentry *debug_count; /* total detect count */
-+static struct dentry *debug_sample_width; /* sample width us */
-+static struct dentry *debug_sample_window; /* sample window us */
-+static struct dentry *debug_sample; /* raw samples us */
-+static struct dentry *debug_threshold; /* threshold us */
-+static struct dentry *debug_enable; /* enable/disable */
-+
-+/* Individual samples and global state */
-+
-+struct sample; /* latency sample */
-+struct data; /* Global state */
-+
-+/* Sampling functions */
-+static int __buffer_add_sample(struct sample *sample);
-+static struct sample *buffer_get_sample(struct sample *sample);
-+
-+/* Threading and state */
-+static int kthread_fn(void *unused);
-+static int start_kthread(void);
-+static int stop_kthread(void);
-+static void __reset_stats(void);
-+static int init_stats(void);
-+
-+/* Debugfs interface */
-+static ssize_t simple_data_read(struct file *filp, char __user *ubuf,
-+ size_t cnt, loff_t *ppos, const u64 *entry);
-+static ssize_t simple_data_write(struct file *filp, const char __user *ubuf,
-+ size_t cnt, loff_t *ppos, u64 *entry);
-+static int debug_sample_fopen(struct inode *inode, struct file *filp);
-+static ssize_t debug_sample_fread(struct file *filp, char __user *ubuf,
-+ size_t cnt, loff_t *ppos);
-+static int debug_sample_release(struct inode *inode, struct file *filp);
-+static int debug_enable_fopen(struct inode *inode, struct file *filp);
-+static ssize_t debug_enable_fread(struct file *filp, char __user *ubuf,
-+ size_t cnt, loff_t *ppos);
-+static ssize_t debug_enable_fwrite(struct file *file,
-+ const char __user *user_buffer,
-+ size_t user_size, loff_t *offset);
-+
-+/* Initialization functions */
-+static int init_debugfs(void);
-+static void free_debugfs(void);
-+static int detector_init(void);
-+static void detector_exit(void);
-+
-+/* Individual latency samples are stored here when detected and packed into
-+ * the ring_buffer circular buffer, where they are overwritten when
-+ * more than buf_size/sizeof(sample) samples are received. */
-+struct sample {
-+ u64 seqnum; /* unique sequence */
-+ u64 duration; /* ktime delta */
-+ u64 outer_duration; /* ktime delta (outer loop) */
-+ struct timespec timestamp; /* wall time */
-+ unsigned long lost;
-+};
-+
-+/* keep the global state somewhere. */
-+static struct data {
-+
-+ struct mutex lock; /* protect changes */
-+
-+ u64 count; /* total since reset */
-+ u64 max_sample; /* max hardware latency */
-+ u64 threshold; /* sample threshold level */
-+
-+ u64 sample_window; /* total sampling window (on+off) */
-+ u64 sample_width; /* active sampling portion of window */
-+
-+ atomic_t sample_open; /* whether the sample file is open */
-+
-+ wait_queue_head_t wq; /* waitqeue for new sample values */
-+
-+} data;
-+
-+/**
-+ * __buffer_add_sample - add a new latency sample recording to the ring buffer
-+ * @sample: The new latency sample value
-+ *
-+ * This receives a new latency sample and records it in a global ring buffer.
-+ * No additional locking is used in this case.
-+ */
-+static int __buffer_add_sample(struct sample *sample)
-+{
-+ return ring_buffer_write(ring_buffer,
-+ sizeof(struct sample), sample);
-+}
-+
-+/**
-+ * buffer_get_sample - remove a hardware latency sample from the ring buffer
-+ * @sample: Pre-allocated storage for the sample
-+ *
-+ * This retrieves a hardware latency sample from the global circular buffer
-+ */
-+static struct sample *buffer_get_sample(struct sample *sample)
-+{
-+ struct ring_buffer_event *e = NULL;
-+ struct sample *s = NULL;
-+ unsigned int cpu = 0;
-+
-+ if (!sample)
-+ return NULL;
-+
-+ mutex_lock(&ring_buffer_mutex);
-+ for_each_online_cpu(cpu) {
-+ e = ring_buffer_consume(ring_buffer, cpu, NULL, &sample->lost);
-+ if (e)
-+ break;
-+ }
-+
-+ if (e) {
-+ s = ring_buffer_event_data(e);
-+ memcpy(sample, s, sizeof(struct sample));
-+ } else
-+ sample = NULL;
-+ mutex_unlock(&ring_buffer_mutex);
-+
-+ return sample;
-+}
-+
-+#ifndef CONFIG_TRACING
-+#define time_type ktime_t
-+#define time_get() ktime_get()
-+#define time_to_us(x) ktime_to_us(x)
-+#define time_sub(a, b) ktime_sub(a, b)
-+#define init_time(a, b) (a).tv64 = b
-+#define time_u64(a) ((a).tv64)
-+#else
-+#define time_type u64
-+#define time_get() trace_clock_local()
-+#define time_to_us(x) div_u64(x, 1000)
-+#define time_sub(a, b) ((a) - (b))
-+#define init_time(a, b) (a = b)
-+#define time_u64(a) a
-+#endif
-+/**
-+ * get_sample - sample the CPU TSC and look for likely hardware latencies
-+ *
-+ * Used to repeatedly capture the CPU TSC (or similar), looking for potential
-+ * hardware-induced latency. Called with interrupts disabled and with
-+ * data.lock held.
-+ */
-+static int get_sample(void)
-+{
-+ time_type start, t1, t2, last_t2;
-+ s64 diff, total = 0;
-+ u64 sample = 0;
-+ u64 outer_sample = 0;
-+ int ret = -1;
-+
-+ init_time(last_t2, 0);
-+ start = time_get(); /* start timestamp */
-+
-+ do {
-+
-+ t1 = time_get(); /* we'll look for a discontinuity */
-+ t2 = time_get();
-+
-+ if (time_u64(last_t2)) {
-+ /* Check the delta from outer loop (t2 to next t1) */
-+ diff = time_to_us(time_sub(t1, last_t2));
-+ /* This shouldn't happen */
-+ if (diff < 0) {
-+ pr_err(BANNER "time running backwards\n");
-+ goto out;
-+ }
-+ if (diff > outer_sample)
-+ outer_sample = diff;
-+ }
-+ last_t2 = t2;
-+
-+ total = time_to_us(time_sub(t2, start)); /* sample width */
-+
-+ /* This checks the inner loop (t1 to t2) */
-+ diff = time_to_us(time_sub(t2, t1)); /* current diff */
-+
-+ /* This shouldn't happen */
-+ if (diff < 0) {
-+ pr_err(BANNER "time running backwards\n");
-+ goto out;
-+ }
-+
-+ if (diff > sample)
-+ sample = diff; /* only want highest value */
-+
-+ } while (total <= data.sample_width);
-+
-+ ret = 0;
-+
-+ /* If we exceed the threshold value, we have found a hardware latency */
-+ if (sample > data.threshold || outer_sample > data.threshold) {
-+ struct sample s;
-+
-+ ret = 1;
-+
-+ data.count++;
-+ s.seqnum = data.count;
-+ s.duration = sample;
-+ s.outer_duration = outer_sample;
-+ s.timestamp = CURRENT_TIME;
-+ __buffer_add_sample(&s);
-+
-+ /* Keep a running maximum ever recorded hardware latency */
-+ if (sample > data.max_sample)
-+ data.max_sample = sample;
-+ }
-+
-+out:
-+ return ret;
-+}
-+
-+/*
-+ * kthread_fn - The CPU time sampling/hardware latency detection kernel thread
-+ * @unused: A required part of the kthread API.
-+ *
-+ * Used to periodically sample the CPU TSC via a call to get_sample. We
-+ * disable interrupts, which does (intentionally) introduce latency since we
-+ * need to ensure nothing else might be running (and thus pre-empting).
-+ * Obviously this should never be used in production environments.
-+ *
-+ * Currently this runs on which ever CPU it was scheduled on, but most
-+ * real-worald hardware latency situations occur across several CPUs,
-+ * but we might later generalize this if we find there are any actualy
-+ * systems with alternate SMI delivery or other hardware latencies.
-+ */
-+static int kthread_fn(void *unused)
-+{
-+ int ret;
-+ u64 interval;
-+
-+ while (!kthread_should_stop()) {
-+
-+ mutex_lock(&data.lock);
-+
-+ local_irq_disable();
-+ ret = get_sample();
-+ local_irq_enable();
-+
-+ if (ret > 0)
-+ wake_up(&data.wq); /* wake up reader(s) */
-+
-+ interval = data.sample_window - data.sample_width;
-+ do_div(interval, USEC_PER_MSEC); /* modifies interval value */
-+
-+ mutex_unlock(&data.lock);
-+
-+ if (msleep_interruptible(interval))
-+ break;
-+ }
-+
-+ return 0;
-+}
-+
-+/**
-+ * start_kthread - Kick off the hardware latency sampling/detector kthread
-+ *
-+ * This starts a kernel thread that will sit and sample the CPU timestamp
-+ * counter (TSC or similar) and look for potential hardware latencies.
-+ */
-+static int start_kthread(void)
-+{
-+ kthread = kthread_run(kthread_fn, NULL,
-+ DRVNAME);
-+ if (IS_ERR(kthread)) {
-+ pr_err(BANNER "could not start sampling thread\n");
-+ enabled = 0;
-+ return -ENOMEM;
-+ }
-+
-+ return 0;
-+}
-+
-+/**
-+ * stop_kthread - Inform the hardware latency samping/detector kthread to stop
-+ *
-+ * This kicks the running hardware latency sampling/detector kernel thread and
-+ * tells it to stop sampling now. Use this on unload and at system shutdown.
-+ */
-+static int stop_kthread(void)
-+{
-+ int ret;
-+
-+ ret = kthread_stop(kthread);
-+
-+ return ret;
-+}
-+
-+/**
-+ * __reset_stats - Reset statistics for the hardware latency detector
-+ *
-+ * We use data to store various statistics and global state. We call this
-+ * function in order to reset those when "enable" is toggled on or off, and
-+ * also at initialization. Should be called with data.lock held.
-+ */
-+static void __reset_stats(void)
-+{
-+ data.count = 0;
-+ data.max_sample = 0;
-+ ring_buffer_reset(ring_buffer); /* flush out old sample entries */
-+}
-+
-+/**
-+ * init_stats - Setup global state statistics for the hardware latency detector
-+ *
-+ * We use data to store various statistics and global state. We also use
-+ * a global ring buffer (ring_buffer) to keep raw samples of detected hardware
-+ * induced system latencies. This function initializes these structures and
-+ * allocates the global ring buffer also.
-+ */
-+static int init_stats(void)
-+{
-+ int ret = -ENOMEM;
-+
-+ mutex_init(&data.lock);
-+ init_waitqueue_head(&data.wq);
-+ atomic_set(&data.sample_open, 0);
-+
-+ ring_buffer = ring_buffer_alloc(buf_size, BUF_FLAGS);
-+
-+ if (WARN(!ring_buffer, KERN_ERR BANNER
-+ "failed to allocate ring buffer!\n"))
-+ goto out;
-+
-+ __reset_stats();
-+ data.threshold = threshold ?: DEFAULT_LAT_THRESHOLD; /* threshold us */
-+ data.sample_window = DEFAULT_SAMPLE_WINDOW; /* window us */
-+ data.sample_width = DEFAULT_SAMPLE_WIDTH; /* width us */
-+
-+ ret = 0;
-+
-+out:
-+ return ret;
-+
-+}
-+
-+/*
-+ * simple_data_read - Wrapper read function for global state debugfs entries
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The userspace provided buffer to read value into
-+ * @cnt: The maximum number of bytes to read
-+ * @ppos: The current "file" position
-+ * @entry: The entry to read from
-+ *
-+ * This function provides a generic read implementation for the global state
-+ * "data" structure debugfs filesystem entries. It would be nice to use
-+ * simple_attr_read directly, but we need to make sure that the data.lock
-+ * is held during the actual read.
-+ */
-+static ssize_t simple_data_read(struct file *filp, char __user *ubuf,
-+ size_t cnt, loff_t *ppos, const u64 *entry)
-+{
-+ char buf[U64STR_SIZE];
-+ u64 val = 0;
-+ int len = 0;
-+
-+ memset(buf, 0, sizeof(buf));
-+
-+ if (!entry)
-+ return -EFAULT;
-+
-+ mutex_lock(&data.lock);
-+ val = *entry;
-+ mutex_unlock(&data.lock);
-+
-+ len = snprintf(buf, sizeof(buf), "%llu\n", (unsigned long long)val);
-+
-+ return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
-+
-+}
-+
-+/*
-+ * simple_data_write - Wrapper write function for global state debugfs entries
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The userspace provided buffer to write value from
-+ * @cnt: The maximum number of bytes to write
-+ * @ppos: The current "file" position
-+ * @entry: The entry to write to
-+ *
-+ * This function provides a generic write implementation for the global state
-+ * "data" structure debugfs filesystem entries. It would be nice to use
-+ * simple_attr_write directly, but we need to make sure that the data.lock
-+ * is held during the actual write.
-+ */
-+static ssize_t simple_data_write(struct file *filp, const char __user *ubuf,
-+ size_t cnt, loff_t *ppos, u64 *entry)
-+{
-+ char buf[U64STR_SIZE];
-+ int csize = min(cnt, sizeof(buf));
-+ u64 val = 0;
-+ int err = 0;
-+
-+ memset(buf, '\0', sizeof(buf));
-+ if (copy_from_user(buf, ubuf, csize))
-+ return -EFAULT;
-+
-+ buf[U64STR_SIZE-1] = '\0'; /* just in case */
-+ err = kstrtoull(buf, 10, &val);
-+ if (err)
-+ return -EINVAL;
-+
-+ mutex_lock(&data.lock);
-+ *entry = val;
-+ mutex_unlock(&data.lock);
-+
-+ return csize;
-+}
-+
-+/**
-+ * debug_count_fopen - Open function for "count" debugfs entry
-+ * @inode: The in-kernel inode representation of the debugfs "file"
-+ * @filp: The active open file structure for the debugfs "file"
-+ *
-+ * This function provides an open implementation for the "count" debugfs
-+ * interface to the hardware latency detector.
-+ */
-+static int debug_count_fopen(struct inode *inode, struct file *filp)
-+{
-+ return 0;
-+}
-+
-+/**
-+ * debug_count_fread - Read function for "count" debugfs entry
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The userspace provided buffer to read value into
-+ * @cnt: The maximum number of bytes to read
-+ * @ppos: The current "file" position
-+ *
-+ * This function provides a read implementation for the "count" debugfs
-+ * interface to the hardware latency detector. Can be used to read the
-+ * number of latency readings exceeding the configured threshold since
-+ * the detector was last reset (e.g. by writing a zero into "count").
-+ */
-+static ssize_t debug_count_fread(struct file *filp, char __user *ubuf,
-+ size_t cnt, loff_t *ppos)
-+{
-+ return simple_data_read(filp, ubuf, cnt, ppos, &data.count);
-+}
-+
-+/**
-+ * debug_count_fwrite - Write function for "count" debugfs entry
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The user buffer that contains the value to write
-+ * @cnt: The maximum number of bytes to write to "file"
-+ * @ppos: The current position in the debugfs "file"
-+ *
-+ * This function provides a write implementation for the "count" debugfs
-+ * interface to the hardware latency detector. Can be used to write a
-+ * desired value, especially to zero the total count.
-+ */
-+static ssize_t debug_count_fwrite(struct file *filp,
-+ const char __user *ubuf,
-+ size_t cnt,
-+ loff_t *ppos)
-+{
-+ return simple_data_write(filp, ubuf, cnt, ppos, &data.count);
-+}
-+
-+/**
-+ * debug_enable_fopen - Dummy open function for "enable" debugfs interface
-+ * @inode: The in-kernel inode representation of the debugfs "file"
-+ * @filp: The active open file structure for the debugfs "file"
-+ *
-+ * This function provides an open implementation for the "enable" debugfs
-+ * interface to the hardware latency detector.
-+ */
-+static int debug_enable_fopen(struct inode *inode, struct file *filp)
-+{
-+ return 0;
-+}
-+
-+/**
-+ * debug_enable_fread - Read function for "enable" debugfs interface
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The userspace provided buffer to read value into
-+ * @cnt: The maximum number of bytes to read
-+ * @ppos: The current "file" position
-+ *
-+ * This function provides a read implementation for the "enable" debugfs
-+ * interface to the hardware latency detector. Can be used to determine
-+ * whether the detector is currently enabled ("0\n" or "1\n" returned).
-+ */
-+static ssize_t debug_enable_fread(struct file *filp, char __user *ubuf,
-+ size_t cnt, loff_t *ppos)
-+{
-+ char buf[4];
-+
-+ if ((cnt < sizeof(buf)) || (*ppos))
-+ return 0;
-+
-+ buf[0] = enabled ? '1' : '0';
-+ buf[1] = '\n';
-+ buf[2] = '\0';
-+ if (copy_to_user(ubuf, buf, strlen(buf)))
-+ return -EFAULT;
-+ return *ppos = strlen(buf);
-+}
-+
-+/**
-+ * debug_enable_fwrite - Write function for "enable" debugfs interface
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The user buffer that contains the value to write
-+ * @cnt: The maximum number of bytes to write to "file"
-+ * @ppos: The current position in the debugfs "file"
-+ *
-+ * This function provides a write implementation for the "enable" debugfs
-+ * interface to the hardware latency detector. Can be used to enable or
-+ * disable the detector, which will have the side-effect of possibly
-+ * also resetting the global stats and kicking off the measuring
-+ * kthread (on an enable) or the converse (upon a disable).
-+ */
-+static ssize_t debug_enable_fwrite(struct file *filp,
-+ const char __user *ubuf,
-+ size_t cnt,
-+ loff_t *ppos)
-+{
-+ char buf[4];
-+ int csize = min(cnt, sizeof(buf));
-+ long val = 0;
-+ int err = 0;
-+
-+ memset(buf, '\0', sizeof(buf));
-+ if (copy_from_user(buf, ubuf, csize))
-+ return -EFAULT;
-+
-+ buf[sizeof(buf)-1] = '\0'; /* just in case */
-+ err = kstrtoul(buf, 10, &val);
-+ if (0 != err)
-+ return -EINVAL;
-+
-+ if (val) {
-+ if (enabled)
-+ goto unlock;
-+ enabled = 1;
-+ __reset_stats();
-+ if (start_kthread())
-+ return -EFAULT;
-+ } else {
-+ if (!enabled)
-+ goto unlock;
-+ enabled = 0;
-+ err = stop_kthread();
-+ if (err) {
-+ pr_err(BANNER "cannot stop kthread\n");
-+ return -EFAULT;
-+ }
-+ wake_up(&data.wq); /* reader(s) should return */
-+ }
-+unlock:
-+ return csize;
-+}
-+
-+/**
-+ * debug_max_fopen - Open function for "max" debugfs entry
-+ * @inode: The in-kernel inode representation of the debugfs "file"
-+ * @filp: The active open file structure for the debugfs "file"
-+ *
-+ * This function provides an open implementation for the "max" debugfs
-+ * interface to the hardware latency detector.
-+ */
-+static int debug_max_fopen(struct inode *inode, struct file *filp)
-+{
-+ return 0;
-+}
-+
-+/**
-+ * debug_max_fread - Read function for "max" debugfs entry
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The userspace provided buffer to read value into
-+ * @cnt: The maximum number of bytes to read
-+ * @ppos: The current "file" position
-+ *
-+ * This function provides a read implementation for the "max" debugfs
-+ * interface to the hardware latency detector. Can be used to determine
-+ * the maximum latency value observed since it was last reset.
-+ */
-+static ssize_t debug_max_fread(struct file *filp, char __user *ubuf,
-+ size_t cnt, loff_t *ppos)
-+{
-+ return simple_data_read(filp, ubuf, cnt, ppos, &data.max_sample);
-+}
-+
-+/**
-+ * debug_max_fwrite - Write function for "max" debugfs entry
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The user buffer that contains the value to write
-+ * @cnt: The maximum number of bytes to write to "file"
-+ * @ppos: The current position in the debugfs "file"
-+ *
-+ * This function provides a write implementation for the "max" debugfs
-+ * interface to the hardware latency detector. Can be used to reset the
-+ * maximum or set it to some other desired value - if, then, subsequent
-+ * measurements exceed this value, the maximum will be updated.
-+ */
-+static ssize_t debug_max_fwrite(struct file *filp,
-+ const char __user *ubuf,
-+ size_t cnt,
-+ loff_t *ppos)
-+{
-+ return simple_data_write(filp, ubuf, cnt, ppos, &data.max_sample);
-+}
-+
-+
-+/**
-+ * debug_sample_fopen - An open function for "sample" debugfs interface
-+ * @inode: The in-kernel inode representation of this debugfs "file"
-+ * @filp: The active open file structure for the debugfs "file"
-+ *
-+ * This function handles opening the "sample" file within the hardware
-+ * latency detector debugfs directory interface. This file is used to read
-+ * raw samples from the global ring_buffer and allows the user to see a
-+ * running latency history. Can be opened blocking or non-blocking,
-+ * affecting whether it behaves as a buffer read pipe, or does not.
-+ * Implements simple locking to prevent multiple simultaneous use.
-+ */
-+static int debug_sample_fopen(struct inode *inode, struct file *filp)
-+{
-+ if (!atomic_add_unless(&data.sample_open, 1, 1))
-+ return -EBUSY;
-+ else
-+ return 0;
-+}
-+
-+/**
-+ * debug_sample_fread - A read function for "sample" debugfs interface
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The user buffer that will contain the samples read
-+ * @cnt: The maximum bytes to read from the debugfs "file"
-+ * @ppos: The current position in the debugfs "file"
-+ *
-+ * This function handles reading from the "sample" file within the hardware
-+ * latency detector debugfs directory interface. This file is used to read
-+ * raw samples from the global ring_buffer and allows the user to see a
-+ * running latency history. By default this will block pending a new
-+ * value written into the sample buffer, unless there are already a
-+ * number of value(s) waiting in the buffer, or the sample file was
-+ * previously opened in a non-blocking mode of operation.
-+ */
-+static ssize_t debug_sample_fread(struct file *filp, char __user *ubuf,
-+ size_t cnt, loff_t *ppos)
-+{
-+ int len = 0;
-+ char buf[64];
-+ struct sample *sample = NULL;
-+
-+ if (!enabled)
-+ return 0;
-+
-+ sample = kzalloc(sizeof(struct sample), GFP_KERNEL);
-+ if (!sample)
-+ return -ENOMEM;
-+
-+ while (!buffer_get_sample(sample)) {
-+
-+ DEFINE_WAIT(wait);
-+
-+ if (filp->f_flags & O_NONBLOCK) {
-+ len = -EAGAIN;
-+ goto out;
-+ }
-+
-+ prepare_to_wait(&data.wq, &wait, TASK_INTERRUPTIBLE);
-+ schedule();
-+ finish_wait(&data.wq, &wait);
-+
-+ if (signal_pending(current)) {
-+ len = -EINTR;
-+ goto out;
-+ }
-+
-+ if (!enabled) { /* enable was toggled */
-+ len = 0;
-+ goto out;
-+ }
-+ }
-+
-+ len = snprintf(buf, sizeof(buf), "%010lu.%010lu\t%llu\t%llu\n",
-+ sample->timestamp.tv_sec,
-+ sample->timestamp.tv_nsec,
-+ sample->duration,
-+ sample->outer_duration);
-+
-+
-+ /* handling partial reads is more trouble than it's worth */
-+ if (len > cnt)
-+ goto out;
-+
-+ if (copy_to_user(ubuf, buf, len))
-+ len = -EFAULT;
-+
-+out:
-+ kfree(sample);
-+ return len;
-+}
-+
-+/**
-+ * debug_sample_release - Release function for "sample" debugfs interface
-+ * @inode: The in-kernel inode represenation of the debugfs "file"
-+ * @filp: The active open file structure for the debugfs "file"
-+ *
-+ * This function completes the close of the debugfs interface "sample" file.
-+ * Frees the sample_open "lock" so that other users may open the interface.
-+ */
-+static int debug_sample_release(struct inode *inode, struct file *filp)
-+{
-+ atomic_dec(&data.sample_open);
-+
-+ return 0;
-+}
-+
-+/**
-+ * debug_threshold_fopen - Open function for "threshold" debugfs entry
-+ * @inode: The in-kernel inode representation of the debugfs "file"
-+ * @filp: The active open file structure for the debugfs "file"
-+ *
-+ * This function provides an open implementation for the "threshold" debugfs
-+ * interface to the hardware latency detector.
-+ */
-+static int debug_threshold_fopen(struct inode *inode, struct file *filp)
-+{
-+ return 0;
-+}
-+
-+/**
-+ * debug_threshold_fread - Read function for "threshold" debugfs entry
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The userspace provided buffer to read value into
-+ * @cnt: The maximum number of bytes to read
-+ * @ppos: The current "file" position
-+ *
-+ * This function provides a read implementation for the "threshold" debugfs
-+ * interface to the hardware latency detector. It can be used to determine
-+ * the current threshold level at which a latency will be recorded in the
-+ * global ring buffer, typically on the order of 10us.
-+ */
-+static ssize_t debug_threshold_fread(struct file *filp, char __user *ubuf,
-+ size_t cnt, loff_t *ppos)
-+{
-+ return simple_data_read(filp, ubuf, cnt, ppos, &data.threshold);
-+}
-+
-+/**
-+ * debug_threshold_fwrite - Write function for "threshold" debugfs entry
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The user buffer that contains the value to write
-+ * @cnt: The maximum number of bytes to write to "file"
-+ * @ppos: The current position in the debugfs "file"
-+ *
-+ * This function provides a write implementation for the "threshold" debugfs
-+ * interface to the hardware latency detector. It can be used to configure
-+ * the threshold level at which any subsequently detected latencies will
-+ * be recorded into the global ring buffer.
-+ */
-+static ssize_t debug_threshold_fwrite(struct file *filp,
-+ const char __user *ubuf,
-+ size_t cnt,
-+ loff_t *ppos)
-+{
-+ int ret;
-+
-+ ret = simple_data_write(filp, ubuf, cnt, ppos, &data.threshold);
-+
-+ if (enabled)
-+ wake_up_process(kthread);
-+
-+ return ret;
-+}
-+
-+/**
-+ * debug_width_fopen - Open function for "width" debugfs entry
-+ * @inode: The in-kernel inode representation of the debugfs "file"
-+ * @filp: The active open file structure for the debugfs "file"
-+ *
-+ * This function provides an open implementation for the "width" debugfs
-+ * interface to the hardware latency detector.
-+ */
-+static int debug_width_fopen(struct inode *inode, struct file *filp)
-+{
-+ return 0;
-+}
-+
-+/**
-+ * debug_width_fread - Read function for "width" debugfs entry
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The userspace provided buffer to read value into
-+ * @cnt: The maximum number of bytes to read
-+ * @ppos: The current "file" position
-+ *
-+ * This function provides a read implementation for the "width" debugfs
-+ * interface to the hardware latency detector. It can be used to determine
-+ * for how many us of the total window us we will actively sample for any
-+ * hardware-induced latecy periods. Obviously, it is not possible to
-+ * sample constantly and have the system respond to a sample reader, or,
-+ * worse, without having the system appear to have gone out to lunch.
-+ */
-+static ssize_t debug_width_fread(struct file *filp, char __user *ubuf,
-+ size_t cnt, loff_t *ppos)
-+{
-+ return simple_data_read(filp, ubuf, cnt, ppos, &data.sample_width);
-+}
-+
-+/**
-+ * debug_width_fwrite - Write function for "width" debugfs entry
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The user buffer that contains the value to write
-+ * @cnt: The maximum number of bytes to write to "file"
-+ * @ppos: The current position in the debugfs "file"
-+ *
-+ * This function provides a write implementation for the "width" debugfs
-+ * interface to the hardware latency detector. It can be used to configure
-+ * for how many us of the total window us we will actively sample for any
-+ * hardware-induced latency periods. Obviously, it is not possible to
-+ * sample constantly and have the system respond to a sample reader, or,
-+ * worse, without having the system appear to have gone out to lunch. It
-+ * is enforced that width is less that the total window size.
-+ */
-+static ssize_t debug_width_fwrite(struct file *filp,
-+ const char __user *ubuf,
-+ size_t cnt,
-+ loff_t *ppos)
-+{
-+ char buf[U64STR_SIZE];
-+ int csize = min(cnt, sizeof(buf));
-+ u64 val = 0;
-+ int err = 0;
-+
-+ memset(buf, '\0', sizeof(buf));
-+ if (copy_from_user(buf, ubuf, csize))
-+ return -EFAULT;
-+
-+ buf[U64STR_SIZE-1] = '\0'; /* just in case */
-+ err = kstrtoull(buf, 10, &val);
-+ if (0 != err)
-+ return -EINVAL;
-+
-+ mutex_lock(&data.lock);
-+ if (val < data.sample_window)
-+ data.sample_width = val;
-+ else {
-+ mutex_unlock(&data.lock);
-+ return -EINVAL;
-+ }
-+ mutex_unlock(&data.lock);
-+
-+ if (enabled)
-+ wake_up_process(kthread);
-+
-+ return csize;
-+}
-+
-+/**
-+ * debug_window_fopen - Open function for "window" debugfs entry
-+ * @inode: The in-kernel inode representation of the debugfs "file"
-+ * @filp: The active open file structure for the debugfs "file"
-+ *
-+ * This function provides an open implementation for the "window" debugfs
-+ * interface to the hardware latency detector. The window is the total time
-+ * in us that will be considered one sample period. Conceptually, windows
-+ * occur back-to-back and contain a sample width period during which
-+ * actual sampling occurs.
-+ */
-+static int debug_window_fopen(struct inode *inode, struct file *filp)
-+{
-+ return 0;
-+}
-+
-+/**
-+ * debug_window_fread - Read function for "window" debugfs entry
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The userspace provided buffer to read value into
-+ * @cnt: The maximum number of bytes to read
-+ * @ppos: The current "file" position
-+ *
-+ * This function provides a read implementation for the "window" debugfs
-+ * interface to the hardware latency detector. The window is the total time
-+ * in us that will be considered one sample period. Conceptually, windows
-+ * occur back-to-back and contain a sample width period during which
-+ * actual sampling occurs. Can be used to read the total window size.
-+ */
-+static ssize_t debug_window_fread(struct file *filp, char __user *ubuf,
-+ size_t cnt, loff_t *ppos)
-+{
-+ return simple_data_read(filp, ubuf, cnt, ppos, &data.sample_window);
-+}
-+
-+/**
-+ * debug_window_fwrite - Write function for "window" debugfs entry
-+ * @filp: The active open file structure for the debugfs "file"
-+ * @ubuf: The user buffer that contains the value to write
-+ * @cnt: The maximum number of bytes to write to "file"
-+ * @ppos: The current position in the debugfs "file"
-+ *
-+ * This function provides a write implementation for the "window" debufds
-+ * interface to the hardware latency detetector. The window is the total time
-+ * in us that will be considered one sample period. Conceptually, windows
-+ * occur back-to-back and contain a sample width period during which
-+ * actual sampling occurs. Can be used to write a new total window size. It
-+ * is enfoced that any value written must be greater than the sample width
-+ * size, or an error results.
-+ */
-+static ssize_t debug_window_fwrite(struct file *filp,
-+ const char __user *ubuf,
-+ size_t cnt,
-+ loff_t *ppos)
-+{
-+ char buf[U64STR_SIZE];
-+ int csize = min(cnt, sizeof(buf));
-+ u64 val = 0;
-+ int err = 0;
-+
-+ memset(buf, '\0', sizeof(buf));
-+ if (copy_from_user(buf, ubuf, csize))
-+ return -EFAULT;
-+
-+ buf[U64STR_SIZE-1] = '\0'; /* just in case */
-+ err = kstrtoull(buf, 10, &val);
-+ if (0 != err)
-+ return -EINVAL;
-+
-+ mutex_lock(&data.lock);
-+ if (data.sample_width < val)
-+ data.sample_window = val;
-+ else {
-+ mutex_unlock(&data.lock);
-+ return -EINVAL;
-+ }
-+ mutex_unlock(&data.lock);
-+
-+ return csize;
-+}
-+
-+/*
-+ * Function pointers for the "count" debugfs file operations
-+ */
-+static const struct file_operations count_fops = {
-+ .open = debug_count_fopen,
-+ .read = debug_count_fread,
-+ .write = debug_count_fwrite,
-+ .owner = THIS_MODULE,
-+};
-+
-+/*
-+ * Function pointers for the "enable" debugfs file operations
-+ */
-+static const struct file_operations enable_fops = {
-+ .open = debug_enable_fopen,
-+ .read = debug_enable_fread,
-+ .write = debug_enable_fwrite,
-+ .owner = THIS_MODULE,
-+};
-+
-+/*
-+ * Function pointers for the "max" debugfs file operations
-+ */
-+static const struct file_operations max_fops = {
-+ .open = debug_max_fopen,
-+ .read = debug_max_fread,
-+ .write = debug_max_fwrite,
-+ .owner = THIS_MODULE,
-+};
-+
-+/*
-+ * Function pointers for the "sample" debugfs file operations
-+ */
-+static const struct file_operations sample_fops = {
-+ .open = debug_sample_fopen,
-+ .read = debug_sample_fread,
-+ .release = debug_sample_release,
-+ .owner = THIS_MODULE,
-+};
-+
-+/*
-+ * Function pointers for the "threshold" debugfs file operations
-+ */
-+static const struct file_operations threshold_fops = {
-+ .open = debug_threshold_fopen,
-+ .read = debug_threshold_fread,
-+ .write = debug_threshold_fwrite,
-+ .owner = THIS_MODULE,
-+};
-+
-+/*
-+ * Function pointers for the "width" debugfs file operations
-+ */
-+static const struct file_operations width_fops = {
-+ .open = debug_width_fopen,
-+ .read = debug_width_fread,
-+ .write = debug_width_fwrite,
-+ .owner = THIS_MODULE,
-+};
-+
-+/*
-+ * Function pointers for the "window" debugfs file operations
-+ */
-+static const struct file_operations window_fops = {
-+ .open = debug_window_fopen,
-+ .read = debug_window_fread,
-+ .write = debug_window_fwrite,
-+ .owner = THIS_MODULE,
-+};
-+
-+/**
-+ * init_debugfs - A function to initialize the debugfs interface files
-+ *
-+ * This function creates entries in debugfs for "hwlat_detector", including
-+ * files to read values from the detector, current samples, and the
-+ * maximum sample that has been captured since the hardware latency
-+ * dectector was started.
-+ */
-+static int init_debugfs(void)
-+{
-+ int ret = -ENOMEM;
-+
-+ debug_dir = debugfs_create_dir(DRVNAME, NULL);
-+ if (!debug_dir)
-+ goto err_debug_dir;
-+
-+ debug_sample = debugfs_create_file("sample", 0444,
-+ debug_dir, NULL,
-+ &sample_fops);
-+ if (!debug_sample)
-+ goto err_sample;
-+
-+ debug_count = debugfs_create_file("count", 0444,
-+ debug_dir, NULL,
-+ &count_fops);
-+ if (!debug_count)
-+ goto err_count;
-+
-+ debug_max = debugfs_create_file("max", 0444,
-+ debug_dir, NULL,
-+ &max_fops);
-+ if (!debug_max)
-+ goto err_max;
-+
-+ debug_sample_window = debugfs_create_file("window", 0644,
-+ debug_dir, NULL,
-+ &window_fops);
-+ if (!debug_sample_window)
-+ goto err_window;
-+
-+ debug_sample_width = debugfs_create_file("width", 0644,
-+ debug_dir, NULL,
-+ &width_fops);
-+ if (!debug_sample_width)
-+ goto err_width;
-+
-+ debug_threshold = debugfs_create_file("threshold", 0644,
-+ debug_dir, NULL,
-+ &threshold_fops);
-+ if (!debug_threshold)
-+ goto err_threshold;
-+
-+ debug_enable = debugfs_create_file("enable", 0644,
-+ debug_dir, &enabled,
-+ &enable_fops);
-+ if (!debug_enable)
-+ goto err_enable;
-+
-+ else {
-+ ret = 0;
-+ goto out;
-+ }
-+
-+err_enable:
-+ debugfs_remove(debug_threshold);
-+err_threshold:
-+ debugfs_remove(debug_sample_width);
-+err_width:
-+ debugfs_remove(debug_sample_window);
-+err_window:
-+ debugfs_remove(debug_max);
-+err_max:
-+ debugfs_remove(debug_count);
-+err_count:
-+ debugfs_remove(debug_sample);
-+err_sample:
-+ debugfs_remove(debug_dir);
-+err_debug_dir:
-+out:
-+ return ret;
-+}
-+
-+/**
-+ * free_debugfs - A function to cleanup the debugfs file interface
-+ */
-+static void free_debugfs(void)
-+{
-+ /* could also use a debugfs_remove_recursive */
-+ debugfs_remove(debug_enable);
-+ debugfs_remove(debug_threshold);
-+ debugfs_remove(debug_sample_width);
-+ debugfs_remove(debug_sample_window);
-+ debugfs_remove(debug_max);
-+ debugfs_remove(debug_count);
-+ debugfs_remove(debug_sample);
-+ debugfs_remove(debug_dir);
-+}
-+
-+/**
-+ * detector_init - Standard module initialization code
-+ */
-+static int detector_init(void)
-+{
-+ int ret = -ENOMEM;
-+
-+ pr_info(BANNER "version %s\n", VERSION);
-+
-+ ret = init_stats();
-+ if (0 != ret)
-+ goto out;
-+
-+ ret = init_debugfs();
-+ if (0 != ret)
-+ goto err_stats;
-+
-+ if (enabled)
-+ ret = start_kthread();
-+
-+ goto out;
-+
-+err_stats:
-+ ring_buffer_free(ring_buffer);
-+out:
-+ return ret;
-+
-+}
-+
-+/**
-+ * detector_exit - Standard module cleanup code
-+ */
-+static void detector_exit(void)
-+{
-+ int err;
-+
-+ if (enabled) {
-+ enabled = 0;
-+ err = stop_kthread();
-+ if (err)
-+ pr_err(BANNER "cannot stop kthread\n");
-+ }
-+
-+ free_debugfs();
-+ ring_buffer_free(ring_buffer); /* free up the ring buffer */
-+
-+}
-+
-+module_init(detector_init);
-+module_exit(detector_exit);
-Index: linux-stable/include/linux/printk.h
-===================================================================
---- linux-stable.orig/include/linux/printk.h
-+++ linux-stable/include/linux/printk.h
-@@ -109,9 +109,11 @@ int no_printk(const char *fmt, ...)
- extern asmlinkage __printf(1, 2)
- void early_printk(const char *fmt, ...);
- void early_vprintk(const char *fmt, va_list ap);
-+extern void printk_kill(void);
- #else
- static inline __printf(1, 2) __cold
- void early_printk(const char *s, ...) { }
-+static inline void printk_kill(void) { }
- #endif
-
- #ifdef CONFIG_PRINTK
-@@ -145,7 +147,6 @@ extern int __printk_ratelimit(const char
- #define printk_ratelimit() __printk_ratelimit(__func__)
- extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
- unsigned int interval_msec);
--
- extern int printk_delay_msec;
- extern int dmesg_restrict;
- extern int kptr_restrict;
-Index: linux-stable/kernel/printk/printk.c
-===================================================================
---- linux-stable.orig/kernel/printk/printk.c
-+++ linux-stable/kernel/printk/printk.c
-@@ -1025,6 +1025,7 @@ static int syslog_print_all(char __user
- {
- char *text;
- int len = 0;
-+ int attempts = 0;
-
- text = kmalloc(LOG_LINE_MAX + PREFIX_MAX, GFP_KERNEL);
- if (!text)
-@@ -1036,7 +1037,14 @@ static int syslog_print_all(char __user
- u64 seq;
- u32 idx;
- enum log_flags prev;
--
-+ int num_msg;
-+try_again:
-+ attempts++;
-+ if (attempts > 10) {
-+ len = -EBUSY;
-+ goto out;
-+ }
-+ num_msg = 0;
- if (clear_seq < log_first_seq) {
- /* messages are gone, move to first available one */
- clear_seq = log_first_seq;
-@@ -1057,6 +1065,14 @@ static int syslog_print_all(char __user
- prev = msg->flags;
- idx = log_next(idx);
- seq++;
-+ num_msg++;
-+ if (num_msg > 5) {
-+ num_msg = 0;
-+ raw_spin_unlock_irq(&logbuf_lock);
-+ raw_spin_lock_irq(&logbuf_lock);
-+ if (clear_seq < log_first_seq)
-+ goto try_again;
-+ }
- }
-
- /* move first record forward until length fits into the buffer */
-@@ -1070,6 +1086,14 @@ static int syslog_print_all(char __user
- prev = msg->flags;
- idx = log_next(idx);
- seq++;
-+ num_msg++;
-+ if (num_msg > 5) {
-+ num_msg = 0;
-+ raw_spin_unlock_irq(&logbuf_lock);
-+ raw_spin_lock_irq(&logbuf_lock);
-+ if (clear_seq < log_first_seq)
-+ goto try_again;
-+ }
- }
-
- /* last message fitting into this dump */
-@@ -1110,6 +1134,7 @@ static int syslog_print_all(char __user
- clear_seq = log_next_seq;
- clear_idx = log_next_idx;
- }
-+out:
- raw_spin_unlock_irq(&logbuf_lock);
-
- kfree(text);
-@@ -1267,6 +1292,7 @@ static void call_console_drivers(int lev
- if (!console_drivers)
- return;
-
-+ migrate_disable();
- for_each_console(con) {
- if (exclusive_console && con != exclusive_console)
- continue;
-@@ -1279,6 +1305,7 @@ static void call_console_drivers(int lev
- continue;
- con->write(con, text, len);
- }
-+ migrate_enable();
- }
-
- /*
-@@ -1338,12 +1365,18 @@ static inline int can_use_console(unsign
- * interrupts disabled. It should return with 'lockbuf_lock'
- * released but interrupts still disabled.
- */
--static int console_trylock_for_printk(unsigned int cpu)
-+static int console_trylock_for_printk(unsigned int cpu, unsigned long flags)
- __releases(&logbuf_lock)
- {
- int retval = 0, wake = 0;
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ int lock = !early_boot_irqs_disabled && !irqs_disabled_flags(flags) &&
-+ (preempt_count() <= 1);
-+#else
-+ int lock = 1;
-+#endif
-
-- if (console_trylock()) {
-+ if (lock && console_trylock()) {
- retval = 1;
-
- /*
-@@ -1483,6 +1516,62 @@ static size_t cont_print_text(char *text
- return textlen;
- }
-
-+#ifdef CONFIG_EARLY_PRINTK
-+struct console *early_console;
-+
-+void early_vprintk(const char *fmt, va_list ap)
-+{
-+ if (early_console) {
-+ char buf[512];
-+ int n = vscnprintf(buf, sizeof(buf), fmt, ap);
-+
-+ early_console->write(early_console, buf, n);
-+ }
-+}
-+
-+asmlinkage void early_printk(const char *fmt, ...)
-+{
-+ va_list ap;
-+
-+ va_start(ap, fmt);
-+ early_vprintk(fmt, ap);
-+ va_end(ap);
-+}
-+
-+/*
-+ * This is independent of any log levels - a global
-+ * kill switch that turns off all of printk.
-+ *
-+ * Used by the NMI watchdog if early-printk is enabled.
-+ */
-+static bool __read_mostly printk_killswitch;
-+
-+static int __init force_early_printk_setup(char *str)
-+{
-+ printk_killswitch = true;
-+ return 0;
-+}
-+early_param("force_early_printk", force_early_printk_setup);
-+
-+void printk_kill(void)
-+{
-+ printk_killswitch = true;
-+}
-+
-+static int forced_early_printk(const char *fmt, va_list ap)
-+{
-+ if (!printk_killswitch)
-+ return 0;
-+ early_vprintk(fmt, ap);
-+ return 1;
-+}
-+#else
-+static inline int forced_early_printk(const char *fmt, va_list ap)
-+{
-+ return 0;
-+}
-+#endif
-+
- asmlinkage int vprintk_emit(int facility, int level,
- const char *dict, size_t dictlen,
- const char *fmt, va_list args)
-@@ -1496,6 +1585,13 @@ asmlinkage int vprintk_emit(int facility
- int this_cpu;
- int printed_len = 0;
-
-+ /*
-+ * Fall back to early_printk if a debugging subsystem has
-+ * killed printk output
-+ */
-+ if (unlikely(forced_early_printk(fmt, args)))
-+ return 1;
-+
- boot_delay_msec(level);
- printk_delay();
-
-@@ -1618,8 +1714,15 @@ asmlinkage int vprintk_emit(int facility
- * The console_trylock_for_printk() function will release 'logbuf_lock'
- * regardless of whether it actually gets the console semaphore or not.
- */
-- if (console_trylock_for_printk(this_cpu))
-+ if (console_trylock_for_printk(this_cpu, flags)) {
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+ console_unlock();
-+#else
-+ raw_local_irq_restore(flags);
- console_unlock();
-+ raw_local_irq_save(flags);
-+#endif
-+ }
-
- lockdep_on();
- out_restore_irqs:
-@@ -1721,29 +1824,6 @@ static size_t cont_print_text(char *text
-
- #endif /* CONFIG_PRINTK */
-
--#ifdef CONFIG_EARLY_PRINTK
--struct console *early_console;
--
--void early_vprintk(const char *fmt, va_list ap)
--{
-- if (early_console) {
-- char buf[512];
-- int n = vscnprintf(buf, sizeof(buf), fmt, ap);
--
-- early_console->write(early_console, buf, n);
-- }
--}
--
--asmlinkage void early_printk(const char *fmt, ...)
--{
-- va_list ap;
--
-- va_start(ap, fmt);
-- early_vprintk(fmt, ap);
-- va_end(ap);
--}
--#endif
--
- static int __add_preferred_console(char *name, int idx, char *options,
- char *brl_options)
- {
-@@ -1984,11 +2064,16 @@ static void console_cont_flush(char *tex
- goto out;
-
- len = cont_print_text(text, size);
-+#ifndef CONFIG_PREEMPT_RT_FULL
- raw_spin_unlock(&logbuf_lock);
- stop_critical_timings();
- call_console_drivers(cont.level, text, len);
- start_critical_timings();
- local_irq_restore(flags);
-+#else
-+ raw_spin_unlock_irqrestore(&logbuf_lock, flags);
-+ call_console_drivers(cont.level, text, len);
-+#endif
- return;
- out:
- raw_spin_unlock_irqrestore(&logbuf_lock, flags);
-@@ -2071,12 +2156,17 @@ skip:
- console_idx = log_next(console_idx);
- console_seq++;
- console_prev = msg->flags;
-- raw_spin_unlock(&logbuf_lock);
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+ raw_spin_unlock(&logbuf_lock);
- stop_critical_timings(); /* don't trace print latency */
- call_console_drivers(level, text, len);
- start_critical_timings();
- local_irq_restore(flags);
-+#else
-+ raw_spin_unlock_irqrestore(&logbuf_lock, flags);
-+ call_console_drivers(level, text, len);
-+#endif
- }
- console_locked = 0;
- mutex_release(&console_lock_dep_map, 1, _RET_IP_);
-Index: linux-stable/kernel/watchdog.c
-===================================================================
---- linux-stable.orig/kernel/watchdog.c
-+++ linux-stable/kernel/watchdog.c
-@@ -205,6 +205,8 @@ static int is_softlockup(unsigned long t
-
- #ifdef CONFIG_HARDLOCKUP_DETECTOR
-
-+static DEFINE_RAW_SPINLOCK(watchdog_output_lock);
-+
- static struct perf_event_attr wd_hw_attr = {
- .type = PERF_TYPE_HARDWARE,
- .config = PERF_COUNT_HW_CPU_CYCLES,
-@@ -239,10 +241,19 @@ static void watchdog_overflow_callback(s
- if (__this_cpu_read(hard_watchdog_warn) == true)
- return;
-
-- if (hardlockup_panic)
-+ /*
-+ * If early-printk is enabled then make sure we do not
-+ * lock up in printk() and kill console logging:
-+ */
-+ printk_kill();
-+
-+ if (hardlockup_panic) {
- panic("Watchdog detected hard LOCKUP on cpu %d", this_cpu);
-- else
-+ } else {
-+ raw_spin_lock(&watchdog_output_lock);
- WARN(1, "Watchdog detected hard LOCKUP on cpu %d", this_cpu);
-+ raw_spin_unlock(&watchdog_output_lock);
-+ }
-
- __this_cpu_write(hard_watchdog_warn, true);
- return;
-@@ -346,6 +357,7 @@ static void watchdog_enable(unsigned int
- /* kick off the timer for the hardlockup detector */
- hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- hrtimer->function = watchdog_timer_fn;
-+ hrtimer->irqsafe = 1;
-
- /* Enable the perf event */
- watchdog_nmi_enable(cpu);
-Index: linux-stable/kernel/Kconfig.preempt
-===================================================================
---- linux-stable.orig/kernel/Kconfig.preempt
-+++ linux-stable/kernel/Kconfig.preempt
-@@ -1,3 +1,16 @@
-+config PREEMPT
-+ bool
-+ select PREEMPT_COUNT
-+
-+config PREEMPT_RT_BASE
-+ bool
-+ select PREEMPT
-+
-+config HAVE_PREEMPT_LAZY
-+ bool
-+
-+config PREEMPT_LAZY
-+ def_bool y if HAVE_PREEMPT_LAZY && PREEMPT_RT_FULL
-
- choice
- prompt "Preemption Model"
-@@ -33,9 +46,9 @@ config PREEMPT_VOLUNTARY
-
- Select this if you are building a kernel for a desktop system.
-
--config PREEMPT
-+config PREEMPT__LL
- bool "Preemptible Kernel (Low-Latency Desktop)"
-- select PREEMPT_COUNT
-+ select PREEMPT
- select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK
- help
- This option reduces the latency of the kernel by making
-@@ -52,6 +65,22 @@ config PREEMPT
- embedded system with latency requirements in the milliseconds
- range.
-
-+config PREEMPT_RTB
-+ bool "Preemptible Kernel (Basic RT)"
-+ select PREEMPT_RT_BASE
-+ help
-+ This option is basically the same as (Low-Latency Desktop) but
-+ enables changes which are preliminary for the full preemptible
-+ RT kernel.
-+
-+config PREEMPT_RT_FULL
-+ bool "Fully Preemptible Kernel (RT)"
-+ depends on IRQ_FORCED_THREADING
-+ select PREEMPT_RT_BASE
-+ select PREEMPT_RCU
-+ help
-+ All and everything
-+
- endchoice
-
- config PREEMPT_COUNT
-Index: linux-stable/arch/Kconfig
-===================================================================
---- linux-stable.orig/arch/Kconfig
-+++ linux-stable/arch/Kconfig
-@@ -6,6 +6,7 @@ config OPROFILE
- tristate "OProfile system profiling"
- depends on PROFILING
- depends on HAVE_OPROFILE
-+ depends on !PREEMPT_RT_FULL
- select RING_BUFFER
- select RING_BUFFER_ALLOW_SWAP
- help
-Index: linux-stable/mm/Kconfig
-===================================================================
---- linux-stable.orig/mm/Kconfig
-+++ linux-stable/mm/Kconfig
-@@ -396,7 +396,7 @@ config NOMMU_INITIAL_TRIM_EXCESS
-
- config TRANSPARENT_HUGEPAGE
- bool "Transparent Hugepage Support"
-- depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE
-+ depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE && !PREEMPT_RT_FULL
- select COMPACTION
- help
- Transparent Hugepages allows the kernel to use huge pages and
-Index: linux-stable/init/Makefile
-===================================================================
---- linux-stable.orig/init/Makefile
-+++ linux-stable/init/Makefile
-@@ -33,4 +33,4 @@ silent_chk_compile.h = :
- include/generated/compile.h: FORCE
- @$($(quiet)chk_compile.h)
- $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \
-- "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CC) $(KBUILD_CFLAGS)"
-+ "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CONFIG_PREEMPT_RT_FULL)" "$(CC) $(KBUILD_CFLAGS)"
-Index: linux-stable/scripts/mkcompile_h
-===================================================================
---- linux-stable.orig/scripts/mkcompile_h
-+++ linux-stable/scripts/mkcompile_h
-@@ -4,7 +4,8 @@ TARGET=$1
- ARCH=$2
- SMP=$3
- PREEMPT=$4
--CC=$5
-+RT=$5
-+CC=$6
-
- vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
-
-@@ -57,6 +58,7 @@ UTS_VERSION="#$VERSION"
- CONFIG_FLAGS=""
- if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
- if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
-+if [ -n "$RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS RT"; fi
- UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
-
- # Truncate to maximum length
-Index: linux-stable/include/asm-generic/bug.h
-===================================================================
---- linux-stable.orig/include/asm-generic/bug.h
-+++ linux-stable/include/asm-generic/bug.h
-@@ -202,6 +202,20 @@ extern void warn_slowpath_null(const cha
- # define WARN_ON_SMP(x) ({0;})
- #endif
-
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+# define BUG_ON_RT(c) BUG_ON(c)
-+# define BUG_ON_NONRT(c) do { } while (0)
-+# define WARN_ON_RT(condition) WARN_ON(condition)
-+# define WARN_ON_NONRT(condition) do { } while (0)
-+# define WARN_ON_ONCE_NONRT(condition) do { } while (0)
-+#else
-+# define BUG_ON_RT(c) do { } while (0)
-+# define BUG_ON_NONRT(c) BUG_ON(c)
-+# define WARN_ON_RT(condition) do { } while (0)
-+# define WARN_ON_NONRT(condition) WARN_ON(condition)
-+# define WARN_ON_ONCE_NONRT(condition) WARN_ON_ONCE(condition)
-+#endif
-+
- #endif /* __ASSEMBLY__ */
-
- #endif
-Index: linux-stable/include/linux/irqflags.h
-===================================================================
---- linux-stable.orig/include/linux/irqflags.h
-+++ linux-stable/include/linux/irqflags.h
-@@ -25,8 +25,6 @@
- # define trace_softirqs_enabled(p) ((p)->softirqs_enabled)
- # define trace_hardirq_enter() do { current->hardirq_context++; } while (0)
- # define trace_hardirq_exit() do { current->hardirq_context--; } while (0)
--# define lockdep_softirq_enter() do { current->softirq_context++; } while (0)
--# define lockdep_softirq_exit() do { current->softirq_context--; } while (0)
- # define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1,
- #else
- # define trace_hardirqs_on() do { } while (0)
-@@ -39,9 +37,15 @@
- # define trace_softirqs_enabled(p) 0
- # define trace_hardirq_enter() do { } while (0)
- # define trace_hardirq_exit() do { } while (0)
-+# define INIT_TRACE_IRQFLAGS
-+#endif
-+
-+#if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT_FULL)
-+# define lockdep_softirq_enter() do { current->softirq_context++; } while (0)
-+# define lockdep_softirq_exit() do { current->softirq_context--; } while (0)
-+#else
- # define lockdep_softirq_enter() do { } while (0)
- # define lockdep_softirq_exit() do { } while (0)
--# define INIT_TRACE_IRQFLAGS
- #endif
-
- #if defined(CONFIG_IRQSOFF_TRACER) || \
-@@ -147,4 +151,23 @@
-
- #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
-
-+/*
-+ * local_irq* variants depending on RT/!RT
-+ */
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+# define local_irq_disable_nort() do { } while (0)
-+# define local_irq_enable_nort() do { } while (0)
-+# define local_irq_save_nort(flags) local_save_flags(flags)
-+# define local_irq_restore_nort(flags) (void)(flags)
-+# define local_irq_disable_rt() local_irq_disable()
-+# define local_irq_enable_rt() local_irq_enable()
-+#else
-+# define local_irq_disable_nort() local_irq_disable()
-+# define local_irq_enable_nort() local_irq_enable()
-+# define local_irq_save_nort(flags) local_irq_save(flags)
-+# define local_irq_restore_nort(flags) local_irq_restore(flags)
-+# define local_irq_disable_rt() do { } while (0)
-+# define local_irq_enable_rt() do { } while (0)
-+#endif
-+
- #endif
-Index: linux-stable/include/linux/preempt.h
-===================================================================
---- linux-stable.orig/include/linux/preempt.h
-+++ linux-stable/include/linux/preempt.h
-@@ -15,7 +15,18 @@
- */
- #define PREEMPT_NEED_RESCHED 0x80000000
-
--#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
-+#ifdef CONFIG_PREEMPT_LAZY
-+#define tif_need_resched() (test_thread_flag(TIF_NEED_RESCHED) || \
-+ test_thread_flag(TIF_NEED_RESCHED_LAZY))
-+#define tif_need_resched_now() (test_thread_flag(TIF_NEED_RESCHED))
-+#define tif_need_resched_lazy() (test_thread_flag(TIF_NEED_RESCHED_LAZY))
-+
-+#else
-+#define tif_need_resched() (test_thread_flag(TIF_NEED_RESCHED))
-+#define tif_need_resched_now() (test_thread_flag(TIF_NEED_RESCHED))
-+#define tif_need_resched_lazy() (0)
-+
-+#endif
-
- #include <asm/preempt.h>
-
-@@ -35,6 +46,20 @@ extern void preempt_count_sub(int val);
- #define preempt_count_inc() preempt_count_add(1)
- #define preempt_count_dec() preempt_count_sub(1)
-
-+#ifdef CONFIG_PREEMPT_LAZY
-+#define add_preempt_lazy_count(val) do { preempt_lazy_count() += (val); } while (0)
-+#define sub_preempt_lazy_count(val) do { preempt_lazy_count() -= (val); } while (0)
-+#define inc_preempt_lazy_count() add_preempt_lazy_count(1)
-+#define dec_preempt_lazy_count() sub_preempt_lazy_count(1)
-+#define preempt_lazy_count() (current_thread_info()->preempt_lazy_count)
-+#else
-+#define add_preempt_lazy_count(val) do { } while (0)
-+#define sub_preempt_lazy_count(val) do { } while (0)
-+#define inc_preempt_lazy_count() do { } while (0)
-+#define dec_preempt_lazy_count() do { } while (0)
-+#define preempt_lazy_count() (0)
-+#endif
-+
- #ifdef CONFIG_PREEMPT_COUNT
-
- #define preempt_disable() \
-@@ -43,13 +68,25 @@ do { \
- barrier(); \
- } while (0)
-
-+#define preempt_lazy_disable() \
-+do { \
-+ inc_preempt_lazy_count(); \
-+ barrier(); \
-+} while (0)
-+
- #define sched_preempt_enable_no_resched() \
- do { \
- barrier(); \
- preempt_count_dec(); \
- } while (0)
-
--#define preempt_enable_no_resched() sched_preempt_enable_no_resched()
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+# define preempt_enable_no_resched() sched_preempt_enable_no_resched()
-+# define preempt_check_resched_rt() preempt_check_resched()
-+#else
-+# define preempt_enable_no_resched() preempt_enable()
-+# define preempt_check_resched_rt() barrier();
-+#endif
-
- #ifdef CONFIG_PREEMPT
- #define preempt_enable() \
-@@ -65,6 +102,13 @@ do { \
- __preempt_schedule(); \
- } while (0)
-
-+#define preempt_lazy_enable() \
-+do { \
-+ dec_preempt_lazy_count(); \
-+ barrier(); \
-+ preempt_check_resched(); \
-+} while (0)
-+
- #else
- #define preempt_enable() \
- do { \
-@@ -123,6 +167,7 @@ do { \
- #define preempt_disable_notrace() barrier()
- #define preempt_enable_no_resched_notrace() barrier()
- #define preempt_enable_notrace() barrier()
-+#define preempt_check_resched_rt() barrier()
-
- #endif /* CONFIG_PREEMPT_COUNT */
-
-@@ -142,10 +187,31 @@ do { \
- } while (0)
- #define preempt_fold_need_resched() \
- do { \
-- if (tif_need_resched()) \
-+ if (tif_need_resched_now()) \
- set_preempt_need_resched(); \
- } while (0)
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+# define preempt_disable_rt() preempt_disable()
-+# define preempt_enable_rt() preempt_enable()
-+# define preempt_disable_nort() barrier()
-+# define preempt_enable_nort() barrier()
-+# ifdef CONFIG_SMP
-+ extern void migrate_disable(void);
-+ extern void migrate_enable(void);
-+# else /* CONFIG_SMP */
-+# define migrate_disable() barrier()
-+# define migrate_enable() barrier()
-+# endif /* CONFIG_SMP */
-+#else
-+# define preempt_disable_rt() barrier()
-+# define preempt_enable_rt() barrier()
-+# define preempt_disable_nort() preempt_disable()
-+# define preempt_enable_nort() preempt_enable()
-+# define migrate_disable() preempt_disable()
-+# define migrate_enable() preempt_enable()
-+#endif
-+
- #ifdef CONFIG_PREEMPT_NOTIFIERS
-
- struct preempt_notifier;
-Index: linux-stable/drivers/ata/libata-sff.c
-===================================================================
---- linux-stable.orig/drivers/ata/libata-sff.c
-+++ linux-stable/drivers/ata/libata-sff.c
-@@ -678,9 +678,9 @@ unsigned int ata_sff_data_xfer_noirq(str
- unsigned long flags;
- unsigned int consumed;
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- consumed = ata_sff_data_xfer32(dev, buf, buflen, rw);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- return consumed;
- }
-@@ -719,7 +719,7 @@ static void ata_pio_sector(struct ata_qu
- unsigned long flags;
-
- /* FIXME: use a bounce buffer */
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- buf = kmap_atomic(page);
-
- /* do the actual data transfer */
-@@ -727,7 +727,7 @@ static void ata_pio_sector(struct ata_qu
- do_write);
-
- kunmap_atomic(buf);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- } else {
- buf = page_address(page);
- ap->ops->sff_data_xfer(qc->dev, buf + offset, qc->sect_size,
-@@ -864,7 +864,7 @@ next_sg:
- unsigned long flags;
-
- /* FIXME: use bounce buffer */
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- buf = kmap_atomic(page);
-
- /* do the actual data transfer */
-@@ -872,7 +872,7 @@ next_sg:
- count, rw);
-
- kunmap_atomic(buf);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- } else {
- buf = page_address(page);
- consumed = ap->ops->sff_data_xfer(dev, buf + offset,
-Index: linux-stable/drivers/ide/alim15x3.c
-===================================================================
---- linux-stable.orig/drivers/ide/alim15x3.c
-+++ linux-stable/drivers/ide/alim15x3.c
-@@ -234,7 +234,7 @@ static int init_chipset_ali15x3(struct p
-
- isa_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
-
- if (m5229_revision < 0xC2) {
- /*
-@@ -325,7 +325,7 @@ out:
- }
- pci_dev_put(north);
- pci_dev_put(isa_dev);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- return 0;
- }
-
-Index: linux-stable/drivers/ide/hpt366.c
-===================================================================
---- linux-stable.orig/drivers/ide/hpt366.c
-+++ linux-stable/drivers/ide/hpt366.c
-@@ -1241,7 +1241,7 @@ static int init_dma_hpt366(ide_hwif_t *h
-
- dma_old = inb(base + 2);
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
-
- dma_new = dma_old;
- pci_read_config_byte(dev, hwif->channel ? 0x4b : 0x43, &masterdma);
-@@ -1252,7 +1252,7 @@ static int init_dma_hpt366(ide_hwif_t *h
- if (dma_new != dma_old)
- outb(dma_new, base + 2);
-
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx\n",
- hwif->name, base, base + 7);
-Index: linux-stable/drivers/ide/ide-io-std.c
-===================================================================
---- linux-stable.orig/drivers/ide/ide-io-std.c
-+++ linux-stable/drivers/ide/ide-io-std.c
-@@ -175,7 +175,7 @@ void ide_input_data(ide_drive_t *drive,
- unsigned long uninitialized_var(flags);
-
- if ((io_32bit & 2) && !mmio) {
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- ata_vlb_sync(io_ports->nsect_addr);
- }
-
-@@ -186,7 +186,7 @@ void ide_input_data(ide_drive_t *drive,
- insl(data_addr, buf, words);
-
- if ((io_32bit & 2) && !mmio)
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- if (((len + 1) & 3) < 2)
- return;
-@@ -219,7 +219,7 @@ void ide_output_data(ide_drive_t *drive,
- unsigned long uninitialized_var(flags);
-
- if ((io_32bit & 2) && !mmio) {
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- ata_vlb_sync(io_ports->nsect_addr);
- }
-
-@@ -230,7 +230,7 @@ void ide_output_data(ide_drive_t *drive,
- outsl(data_addr, buf, words);
-
- if ((io_32bit & 2) && !mmio)
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- if (((len + 1) & 3) < 2)
- return;
-Index: linux-stable/drivers/ide/ide-io.c
-===================================================================
---- linux-stable.orig/drivers/ide/ide-io.c
-+++ linux-stable/drivers/ide/ide-io.c
-@@ -659,7 +659,7 @@ void ide_timer_expiry (unsigned long dat
- /* disable_irq_nosync ?? */
- disable_irq(hwif->irq);
- /* local CPU only, as if we were handling an interrupt */
-- local_irq_disable();
-+ local_irq_disable_nort();
- if (hwif->polling) {
- startstop = handler(drive);
- } else if (drive_is_ready(drive)) {
-Index: linux-stable/drivers/ide/ide-iops.c
-===================================================================
---- linux-stable.orig/drivers/ide/ide-iops.c
-+++ linux-stable/drivers/ide/ide-iops.c
-@@ -129,12 +129,12 @@ int __ide_wait_stat(ide_drive_t *drive,
- if ((stat & ATA_BUSY) == 0)
- break;
-
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- *rstat = stat;
- return -EBUSY;
- }
- }
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- }
- /*
- * Allow status to settle, then read it again.
-Index: linux-stable/drivers/ide/ide-probe.c
-===================================================================
---- linux-stable.orig/drivers/ide/ide-probe.c
-+++ linux-stable/drivers/ide/ide-probe.c
-@@ -196,10 +196,10 @@ static void do_identify(ide_drive_t *dri
- int bswap = 1;
-
- /* local CPU only; some systems need this */
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- /* read 512 bytes of id info */
- hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- drive->dev_flags |= IDE_DFLAG_ID_READ;
- #ifdef DEBUG
-Index: linux-stable/drivers/ide/ide-taskfile.c
-===================================================================
---- linux-stable.orig/drivers/ide/ide-taskfile.c
-+++ linux-stable/drivers/ide/ide-taskfile.c
-@@ -250,7 +250,7 @@ void ide_pio_bytes(ide_drive_t *drive, s
-
- page_is_high = PageHighMem(page);
- if (page_is_high)
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
-
- buf = kmap_atomic(page) + offset;
-
-@@ -271,7 +271,7 @@ void ide_pio_bytes(ide_drive_t *drive, s
- kunmap_atomic(buf);
-
- if (page_is_high)
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- len -= nr_bytes;
- }
-@@ -414,7 +414,7 @@ static ide_startstop_t pre_task_out_intr
- }
-
- if ((drive->dev_flags & IDE_DFLAG_UNMASK) == 0)
-- local_irq_disable();
-+ local_irq_disable_nort();
-
- ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE);
-
-Index: linux-stable/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
-===================================================================
---- linux-stable.orig/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
-+++ linux-stable/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
-@@ -804,7 +804,7 @@ void ipoib_mcast_restart_task(struct wor
-
- ipoib_mcast_stop_thread(dev, 0);
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- netif_addr_lock(dev);
- spin_lock(&priv->lock);
-
-@@ -886,7 +886,7 @@ void ipoib_mcast_restart_task(struct wor
-
- spin_unlock(&priv->lock);
- netif_addr_unlock(dev);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- /* We have to cancel outside of the spinlock */
- list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
-Index: linux-stable/drivers/input/gameport/gameport.c
-===================================================================
---- linux-stable.orig/drivers/input/gameport/gameport.c
-+++ linux-stable/drivers/input/gameport/gameport.c
-@@ -87,12 +87,12 @@ static int gameport_measure_speed(struct
- tx = 1 << 30;
-
- for(i = 0; i < 50; i++) {
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- GET_TIME(t1);
- for (t = 0; t < 50; t++) gameport_read(gameport);
- GET_TIME(t2);
- GET_TIME(t3);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- udelay(i * 10);
- if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t;
- }
-@@ -111,11 +111,11 @@ static int gameport_measure_speed(struct
- tx = 1 << 30;
-
- for(i = 0; i < 50; i++) {
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- rdtscl(t1);
- for (t = 0; t < 50; t++) gameport_read(gameport);
- rdtscl(t2);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- udelay(i * 10);
- if (t2 - t1 < tx) tx = t2 - t1;
- }
-Index: linux-stable/kernel/user.c
-===================================================================
---- linux-stable.orig/kernel/user.c
-+++ linux-stable/kernel/user.c
-@@ -158,11 +158,11 @@ void free_uid(struct user_struct *up)
- if (!up)
- return;
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- if (atomic_dec_and_lock(&up->__count, &uidhash_lock))
- free_user(up, flags);
- else
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- }
-
- struct user_struct *alloc_uid(kuid_t uid)
-Index: linux-stable/kernel/res_counter.c
-===================================================================
---- linux-stable.orig/kernel/res_counter.c
-+++ linux-stable/kernel/res_counter.c
-@@ -49,7 +49,7 @@ static int __res_counter_charge(struct r
-
- r = ret = 0;
- *limit_fail_at = NULL;
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- for (c = counter; c != NULL; c = c->parent) {
- spin_lock(&c->lock);
- r = res_counter_charge_locked(c, val, force);
-@@ -69,7 +69,7 @@ static int __res_counter_charge(struct r
- spin_unlock(&u->lock);
- }
- }
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- return ret;
- }
-@@ -103,7 +103,7 @@ u64 res_counter_uncharge_until(struct re
- struct res_counter *c;
- u64 ret = 0;
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- for (c = counter; c != top; c = c->parent) {
- u64 r;
- spin_lock(&c->lock);
-@@ -112,7 +112,7 @@ u64 res_counter_uncharge_until(struct re
- ret = r;
- spin_unlock(&c->lock);
- }
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- return ret;
- }
-
-Index: linux-stable/drivers/usb/core/hcd.c
-===================================================================
---- linux-stable.orig/drivers/usb/core/hcd.c
-+++ linux-stable/drivers/usb/core/hcd.c
-@@ -1678,9 +1678,9 @@ static void __usb_hcd_giveback_urb(struc
- * and no one may trigger the above deadlock situation when
- * running complete() in tasklet.
- */
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- urb->complete(urb);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- usb_anchor_resume_wakeups(anchor);
- atomic_dec(&urb->use_count);
-Index: linux-stable/lib/scatterlist.c
-===================================================================
---- linux-stable.orig/lib/scatterlist.c
-+++ linux-stable/lib/scatterlist.c
-@@ -583,7 +583,7 @@ void sg_miter_stop(struct sg_mapping_ite
- flush_kernel_dcache_page(miter->page);
-
- if (miter->__flags & SG_MITER_ATOMIC) {
-- WARN_ON_ONCE(preemptible());
-+ WARN_ON_ONCE(!pagefault_disabled());
- kunmap_atomic(miter->addr);
- } else
- kunmap(miter->page);
-@@ -628,7 +628,7 @@ static size_t sg_copy_buffer(struct scat
- if (!sg_miter_skip(&miter, skip))
- return false;
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
-
- while (sg_miter_next(&miter) && offset < buflen) {
- unsigned int len;
-@@ -645,7 +645,7 @@ static size_t sg_copy_buffer(struct scat
-
- sg_miter_stop(&miter);
-
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- return offset;
- }
-
-Index: linux-stable/net/mac80211/rx.c
-===================================================================
---- linux-stable.orig/net/mac80211/rx.c
-+++ linux-stable/net/mac80211/rx.c
-@@ -3346,7 +3346,7 @@ void ieee80211_rx(struct ieee80211_hw *h
- struct ieee80211_supported_band *sband;
- struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
-
-- WARN_ON_ONCE(softirq_count() == 0);
-+ WARN_ON_ONCE_NONRT(softirq_count() == 0);
-
- if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
- goto drop;
-Index: linux-stable/include/linux/page_cgroup.h
-===================================================================
---- linux-stable.orig/include/linux/page_cgroup.h
-+++ linux-stable/include/linux/page_cgroup.h
-@@ -24,6 +24,9 @@ enum {
- */
- struct page_cgroup {
- unsigned long flags;
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ spinlock_t pcg_lock;
-+#endif
- struct mem_cgroup *mem_cgroup;
- };
-
-@@ -74,12 +77,20 @@ static inline void lock_page_cgroup(stru
- * Don't take this lock in IRQ context.
- * This lock is for pc->mem_cgroup, USED, MIGRATION
- */
-+#ifndef CONFIG_PREEMPT_RT_BASE
- bit_spin_lock(PCG_LOCK, &pc->flags);
-+#else
-+ spin_lock(&pc->pcg_lock);
-+#endif
- }
-
- static inline void unlock_page_cgroup(struct page_cgroup *pc)
- {
-+#ifndef CONFIG_PREEMPT_RT_BASE
- bit_spin_unlock(PCG_LOCK, &pc->flags);
-+#else
-+ spin_unlock(&pc->pcg_lock);
-+#endif
- }
-
- #else /* CONFIG_MEMCG */
-@@ -102,6 +113,10 @@ static inline void __init page_cgroup_in
- {
- }
-
-+static inline void page_cgroup_lock_init(struct page_cgroup *pc)
-+{
-+}
-+
- #endif /* CONFIG_MEMCG */
-
- #include <linux/swap.h>
-Index: linux-stable/mm/page_cgroup.c
-===================================================================
---- linux-stable.orig/mm/page_cgroup.c
-+++ linux-stable/mm/page_cgroup.c
-@@ -13,6 +13,14 @@
-
- static unsigned long total_usage;
-
-+static void page_cgroup_lock_init(struct page_cgroup *pc, int nr_pages)
-+{
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ for (; nr_pages; nr_pages--, pc++)
-+ spin_lock_init(&pc->pcg_lock);
-+#endif
-+}
-+
- #if !defined(CONFIG_SPARSEMEM)
-
-
-@@ -61,6 +69,7 @@ static int __init alloc_node_page_cgroup
- return -ENOMEM;
- NODE_DATA(nid)->node_page_cgroup = base;
- total_usage += table_size;
-+ page_cgroup_lock_init(base, nr_pages);
- return 0;
- }
-
-@@ -151,6 +160,8 @@ static int __meminit init_section_page_c
- return -ENOMEM;
- }
-
-+ page_cgroup_lock_init(base, PAGES_PER_SECTION);
-+
- /*
- * The passed "pfn" may not be aligned to SECTION. For the calculation
- * we need to apply a mask.
-Index: linux-stable/fs/buffer.c
-===================================================================
---- linux-stable.orig/fs/buffer.c
-+++ linux-stable/fs/buffer.c
-@@ -322,8 +322,7 @@ static void end_buffer_async_read(struct
- * decide that the page is now completely done.
- */
- first = page_buffers(page);
-- local_irq_save(flags);
-- bit_spin_lock(BH_Uptodate_Lock, &first->b_state);
-+ flags = bh_uptodate_lock_irqsave(first);
- clear_buffer_async_read(bh);
- unlock_buffer(bh);
- tmp = bh;
-@@ -336,8 +335,7 @@ static void end_buffer_async_read(struct
- }
- tmp = tmp->b_this_page;
- } while (tmp != bh);
-- bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
-- local_irq_restore(flags);
-+ bh_uptodate_unlock_irqrestore(first, flags);
-
- /*
- * If none of the buffers had errors and they are all
-@@ -349,9 +347,7 @@ static void end_buffer_async_read(struct
- return;
-
- still_busy:
-- bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
-- local_irq_restore(flags);
-- return;
-+ bh_uptodate_unlock_irqrestore(first, flags);
- }
-
- /*
-@@ -385,8 +381,7 @@ void end_buffer_async_write(struct buffe
- }
-
- first = page_buffers(page);
-- local_irq_save(flags);
-- bit_spin_lock(BH_Uptodate_Lock, &first->b_state);
-+ flags = bh_uptodate_lock_irqsave(first);
-
- clear_buffer_async_write(bh);
- unlock_buffer(bh);
-@@ -398,15 +393,12 @@ void end_buffer_async_write(struct buffe
- }
- tmp = tmp->b_this_page;
- }
-- bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
-- local_irq_restore(flags);
-+ bh_uptodate_unlock_irqrestore(first, flags);
- end_page_writeback(page);
- return;
-
- still_busy:
-- bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
-- local_irq_restore(flags);
-- return;
-+ bh_uptodate_unlock_irqrestore(first, flags);
- }
- EXPORT_SYMBOL(end_buffer_async_write);
-
-@@ -3336,6 +3328,7 @@ struct buffer_head *alloc_buffer_head(gf
- struct buffer_head *ret = kmem_cache_zalloc(bh_cachep, gfp_flags);
- if (ret) {
- INIT_LIST_HEAD(&ret->b_assoc_buffers);
-+ buffer_head_init_locks(ret);
- preempt_disable();
- __this_cpu_inc(bh_accounting.nr);
- recalc_bh_state();
-Index: linux-stable/fs/ntfs/aops.c
-===================================================================
---- linux-stable.orig/fs/ntfs/aops.c
-+++ linux-stable/fs/ntfs/aops.c
-@@ -108,8 +108,7 @@ static void ntfs_end_buffer_async_read(s
- "0x%llx.", (unsigned long long)bh->b_blocknr);
- }
- first = page_buffers(page);
-- local_irq_save(flags);
-- bit_spin_lock(BH_Uptodate_Lock, &first->b_state);
-+ flags = bh_uptodate_lock_irqsave(first);
- clear_buffer_async_read(bh);
- unlock_buffer(bh);
- tmp = bh;
-@@ -124,8 +123,7 @@ static void ntfs_end_buffer_async_read(s
- }
- tmp = tmp->b_this_page;
- } while (tmp != bh);
-- bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
-- local_irq_restore(flags);
-+ bh_uptodate_unlock_irqrestore(first, flags);
- /*
- * If none of the buffers had errors then we can set the page uptodate,
- * but we first have to perform the post read mst fixups, if the
-@@ -146,13 +144,13 @@ static void ntfs_end_buffer_async_read(s
- recs = PAGE_CACHE_SIZE / rec_size;
- /* Should have been verified before we got here... */
- BUG_ON(!recs);
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- kaddr = kmap_atomic(page);
- for (i = 0; i < recs; i++)
- post_read_mst_fixup((NTFS_RECORD*)(kaddr +
- i * rec_size), rec_size);
- kunmap_atomic(kaddr);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- flush_dcache_page(page);
- if (likely(page_uptodate && !PageError(page)))
- SetPageUptodate(page);
-@@ -160,9 +158,7 @@ static void ntfs_end_buffer_async_read(s
- unlock_page(page);
- return;
- still_busy:
-- bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
-- local_irq_restore(flags);
-- return;
-+ bh_uptodate_unlock_irqrestore(first, flags);
- }
-
- /**
-Index: linux-stable/include/linux/buffer_head.h
-===================================================================
---- linux-stable.orig/include/linux/buffer_head.h
-+++ linux-stable/include/linux/buffer_head.h
-@@ -75,8 +75,52 @@ struct buffer_head {
- struct address_space *b_assoc_map; /* mapping this buffer is
- associated with */
- atomic_t b_count; /* users using this buffer_head */
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ spinlock_t b_uptodate_lock;
-+#if defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE) || \
-+ defined(CONFIG_JBD2) || defined(CONFIG_JBD2_MODULE)
-+ spinlock_t b_state_lock;
-+ spinlock_t b_journal_head_lock;
-+#endif
-+#endif
- };
-
-+static inline unsigned long bh_uptodate_lock_irqsave(struct buffer_head *bh)
-+{
-+ unsigned long flags;
-+
-+#ifndef CONFIG_PREEMPT_RT_BASE
-+ local_irq_save(flags);
-+ bit_spin_lock(BH_Uptodate_Lock, &bh->b_state);
-+#else
-+ spin_lock_irqsave(&bh->b_uptodate_lock, flags);
-+#endif
-+ return flags;
-+}
-+
-+static inline void
-+bh_uptodate_unlock_irqrestore(struct buffer_head *bh, unsigned long flags)
-+{
-+#ifndef CONFIG_PREEMPT_RT_BASE
-+ bit_spin_unlock(BH_Uptodate_Lock, &bh->b_state);
-+ local_irq_restore(flags);
-+#else
-+ spin_unlock_irqrestore(&bh->b_uptodate_lock, flags);
-+#endif
-+}
-+
-+static inline void buffer_head_init_locks(struct buffer_head *bh)
-+{
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ spin_lock_init(&bh->b_uptodate_lock);
-+#if defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE) || \
-+ defined(CONFIG_JBD2) || defined(CONFIG_JBD2_MODULE)
-+ spin_lock_init(&bh->b_state_lock);
-+ spin_lock_init(&bh->b_journal_head_lock);
-+#endif
-+#endif
-+}
-+
- /*
- * macro tricks to expand the set_buffer_foo(), clear_buffer_foo()
- * and buffer_foo() functions.
-Index: linux-stable/include/linux/jbd_common.h
-===================================================================
---- linux-stable.orig/include/linux/jbd_common.h
-+++ linux-stable/include/linux/jbd_common.h
-@@ -15,32 +15,56 @@ static inline struct journal_head *bh2jh
-
- static inline void jbd_lock_bh_state(struct buffer_head *bh)
- {
-+#ifndef CONFIG_PREEMPT_RT_BASE
- bit_spin_lock(BH_State, &bh->b_state);
-+#else
-+ spin_lock(&bh->b_state_lock);
-+#endif
- }
-
- static inline int jbd_trylock_bh_state(struct buffer_head *bh)
- {
-+#ifndef CONFIG_PREEMPT_RT_BASE
- return bit_spin_trylock(BH_State, &bh->b_state);
-+#else
-+ return spin_trylock(&bh->b_state_lock);
-+#endif
- }
-
- static inline int jbd_is_locked_bh_state(struct buffer_head *bh)
- {
-+#ifndef CONFIG_PREEMPT_RT_BASE
- return bit_spin_is_locked(BH_State, &bh->b_state);
-+#else
-+ return spin_is_locked(&bh->b_state_lock);
-+#endif
- }
-
- static inline void jbd_unlock_bh_state(struct buffer_head *bh)
- {
-+#ifndef CONFIG_PREEMPT_RT_BASE
- bit_spin_unlock(BH_State, &bh->b_state);
-+#else
-+ spin_unlock(&bh->b_state_lock);
-+#endif
- }
-
- static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
- {
-+#ifndef CONFIG_PREEMPT_RT_BASE
- bit_spin_lock(BH_JournalHead, &bh->b_state);
-+#else
-+ spin_lock(&bh->b_journal_head_lock);
-+#endif
- }
-
- static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
- {
-+#ifndef CONFIG_PREEMPT_RT_BASE
- bit_spin_unlock(BH_JournalHead, &bh->b_state);
-+#else
-+ spin_unlock(&bh->b_journal_head_lock);
-+#endif
- }
-
- #endif
-Index: linux-stable/include/linux/list_bl.h
-===================================================================
---- linux-stable.orig/include/linux/list_bl.h
-+++ linux-stable/include/linux/list_bl.h
-@@ -2,6 +2,7 @@
- #define _LINUX_LIST_BL_H
-
- #include <linux/list.h>
-+#include <linux/spinlock.h>
- #include <linux/bit_spinlock.h>
-
- /*
-@@ -32,13 +33,22 @@
-
- struct hlist_bl_head {
- struct hlist_bl_node *first;
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ raw_spinlock_t lock;
-+#endif
- };
-
- struct hlist_bl_node {
- struct hlist_bl_node *next, **pprev;
- };
--#define INIT_HLIST_BL_HEAD(ptr) \
-- ((ptr)->first = NULL)
-+
-+static inline void INIT_HLIST_BL_HEAD(struct hlist_bl_head *h)
-+{
-+ h->first = NULL;
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ raw_spin_lock_init(&h->lock);
-+#endif
-+}
-
- static inline void INIT_HLIST_BL_NODE(struct hlist_bl_node *h)
- {
-@@ -117,12 +127,26 @@ static inline void hlist_bl_del_init(str
-
- static inline void hlist_bl_lock(struct hlist_bl_head *b)
- {
-+#ifndef CONFIG_PREEMPT_RT_BASE
- bit_spin_lock(0, (unsigned long *)b);
-+#else
-+ raw_spin_lock(&b->lock);
-+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
-+ __set_bit(0, (unsigned long *)b);
-+#endif
-+#endif
- }
-
- static inline void hlist_bl_unlock(struct hlist_bl_head *b)
- {
-+#ifndef CONFIG_PREEMPT_RT_BASE
- __bit_spin_unlock(0, (unsigned long *)b);
-+#else
-+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
-+ __clear_bit(0, (unsigned long *)b);
-+#endif
-+ raw_spin_unlock(&b->lock);
-+#endif
- }
-
- static inline bool hlist_bl_is_locked(struct hlist_bl_head *b)
-Index: linux-stable/lib/Kconfig.debug
-===================================================================
---- linux-stable.orig/lib/Kconfig.debug
-+++ linux-stable/lib/Kconfig.debug
-@@ -606,7 +606,7 @@ endmenu # "Memory Debugging"
-
- config DEBUG_SHIRQ
- bool "Debug shared IRQ handlers"
-- depends on DEBUG_KERNEL
-+ depends on DEBUG_KERNEL && !PREEMPT_RT_BASE
- help
- Enable this to generate a spurious interrupt as soon as a shared
- interrupt handler is registered, and just before one is deregistered.
-Index: linux-stable/kernel/irq/spurious.c
-===================================================================
---- linux-stable.orig/kernel/irq/spurious.c
-+++ linux-stable/kernel/irq/spurious.c
-@@ -444,6 +444,10 @@ MODULE_PARM_DESC(noirqdebug, "Disable ir
-
- static int __init irqfixup_setup(char *str)
- {
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ pr_warn("irqfixup boot option not supported w/ CONFIG_PREEMPT_RT_BASE\n");
-+ return 1;
-+#endif
- irqfixup = 1;
- printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n");
- printk(KERN_WARNING "This may impact system performance.\n");
-@@ -456,6 +460,10 @@ module_param(irqfixup, int, 0644);
-
- static int __init irqpoll_setup(char *str)
- {
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ pr_warn("irqpoll boot option not supported w/ CONFIG_PREEMPT_RT_BASE\n");
-+ return 1;
-+#endif
- irqfixup = 2;
- printk(KERN_WARNING "Misrouted IRQ fixup and polling support "
- "enabled\n");
-Index: linux-stable/kernel/irq/manage.c
-===================================================================
---- linux-stable.orig/kernel/irq/manage.c
-+++ linux-stable/kernel/irq/manage.c
-@@ -22,6 +22,7 @@
- #include "internals.h"
-
- #ifdef CONFIG_IRQ_FORCED_THREADING
-+# ifndef CONFIG_PREEMPT_RT_BASE
- __read_mostly bool force_irqthreads;
-
- static int __init setup_forced_irqthreads(char *arg)
-@@ -30,6 +31,7 @@ static int __init setup_forced_irqthread
- return 0;
- }
- early_param("threadirqs", setup_forced_irqthreads);
-+# endif
- #endif
-
- /**
-@@ -143,6 +145,62 @@ static inline void
- irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { }
- #endif
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+static void _irq_affinity_notify(struct irq_affinity_notify *notify);
-+static struct task_struct *set_affinity_helper;
-+static LIST_HEAD(affinity_list);
-+static DEFINE_RAW_SPINLOCK(affinity_list_lock);
-+
-+static int set_affinity_thread(void *unused)
-+{
-+ while (1) {
-+ struct irq_affinity_notify *notify;
-+ int empty;
-+
-+ set_current_state(TASK_INTERRUPTIBLE);
-+
-+ raw_spin_lock_irq(&affinity_list_lock);
-+ empty = list_empty(&affinity_list);
-+ raw_spin_unlock_irq(&affinity_list_lock);
-+
-+ if (empty)
-+ schedule();
-+ if (kthread_should_stop())
-+ break;
-+ set_current_state(TASK_RUNNING);
-+try_next:
-+ notify = NULL;
-+
-+ raw_spin_lock_irq(&affinity_list_lock);
-+ if (!list_empty(&affinity_list)) {
-+ notify = list_first_entry(&affinity_list,
-+ struct irq_affinity_notify, list);
-+ list_del_init(&notify->list);
-+ }
-+ raw_spin_unlock_irq(&affinity_list_lock);
-+
-+ if (!notify)
-+ continue;
-+ _irq_affinity_notify(notify);
-+ goto try_next;
-+ }
-+ return 0;
-+}
-+
-+static void init_helper_thread(void)
-+{
-+ if (set_affinity_helper)
-+ return;
-+ set_affinity_helper = kthread_run(set_affinity_thread, NULL,
-+ "affinity-cb");
-+ WARN_ON(IS_ERR(set_affinity_helper));
-+}
-+#else
-+
-+static inline void init_helper_thread(void) { }
-+
-+#endif
-+
- int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
- bool force)
- {
-@@ -181,7 +239,17 @@ int irq_set_affinity_locked(struct irq_d
-
- if (desc->affinity_notify) {
- kref_get(&desc->affinity_notify->kref);
-+
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ raw_spin_lock(&affinity_list_lock);
-+ if (list_empty(&desc->affinity_notify->list))
-+ list_add_tail(&affinity_list,
-+ &desc->affinity_notify->list);
-+ raw_spin_unlock(&affinity_list_lock);
-+ wake_up_process(set_affinity_helper);
-+#else
- schedule_work(&desc->affinity_notify->work);
-+#endif
- }
- irqd_set(data, IRQD_AFFINITY_SET);
-
-@@ -216,10 +284,8 @@ int irq_set_affinity_hint(unsigned int i
- }
- EXPORT_SYMBOL_GPL(irq_set_affinity_hint);
-
--static void irq_affinity_notify(struct work_struct *work)
-+static void _irq_affinity_notify(struct irq_affinity_notify *notify)
- {
-- struct irq_affinity_notify *notify =
-- container_of(work, struct irq_affinity_notify, work);
- struct irq_desc *desc = irq_to_desc(notify->irq);
- cpumask_var_t cpumask;
- unsigned long flags;
-@@ -241,6 +307,13 @@ out:
- kref_put(&notify->kref, notify->release);
- }
-
-+static void irq_affinity_notify(struct work_struct *work)
-+{
-+ struct irq_affinity_notify *notify =
-+ container_of(work, struct irq_affinity_notify, work);
-+ _irq_affinity_notify(notify);
-+}
-+
- /**
- * irq_set_affinity_notifier - control notification of IRQ affinity changes
- * @irq: Interrupt for which to enable/disable notification
-@@ -270,6 +343,8 @@ irq_set_affinity_notifier(unsigned int i
- notify->irq = irq;
- kref_init(&notify->kref);
- INIT_WORK(&notify->work, irq_affinity_notify);
-+ INIT_LIST_HEAD(&notify->list);
-+ init_helper_thread();
- }
-
- raw_spin_lock_irqsave(&desc->lock, flags);
-@@ -776,7 +851,15 @@ irq_forced_thread_fn(struct irq_desc *de
- local_bh_disable();
- ret = action->thread_fn(action->irq, action->dev_id);
- irq_finalize_oneshot(desc, action);
-- local_bh_enable();
-+ /*
-+ * Interrupts which have real time requirements can be set up
-+ * to avoid softirq processing in the thread handler. This is
-+ * safe as these interrupts do not raise soft interrupts.
-+ */
-+ if (irq_settings_no_softirq_call(desc))
-+ _local_bh_enable();
-+ else
-+ local_bh_enable();
- return ret;
- }
-
-@@ -859,6 +942,12 @@ static int irq_thread(void *data)
- if (action_ret == IRQ_HANDLED)
- atomic_inc(&desc->threads_handled);
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ migrate_disable();
-+ add_interrupt_randomness(action->irq, 0,
-+ desc->random_ip ^ (unsigned long) action);
-+ migrate_enable();
-+#endif
- wake_threads_waitq(desc);
- }
-
-@@ -1121,6 +1210,9 @@ __setup_irq(unsigned int irq, struct irq
- irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
- }
-
-+ if (new->flags & IRQF_NO_SOFTIRQ_CALL)
-+ irq_settings_set_no_softirq_call(desc);
-+
- /* Set default affinity mask once everything is setup */
- setup_affinity(irq, desc, mask);
-
-Index: linux-stable/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
-===================================================================
---- linux-stable.orig/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
-+++ linux-stable/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
-@@ -2217,11 +2217,7 @@ static netdev_tx_t atl1c_xmit_frame(stru
- }
-
- tpd_req = atl1c_cal_tpd_req(skb);
-- if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
-- if (netif_msg_pktdata(adapter))
-- dev_info(&adapter->pdev->dev, "tx locked\n");
-- return NETDEV_TX_LOCKED;
-- }
-+ spin_lock_irqsave(&adapter->tx_lock, flags);
-
- if (atl1c_tpd_avail(adapter, type) < tpd_req) {
- /* no enough descriptor, just stop queue */
-Index: linux-stable/drivers/net/ethernet/atheros/atl1e/atl1e_main.c
-===================================================================
---- linux-stable.orig/drivers/net/ethernet/atheros/atl1e/atl1e_main.c
-+++ linux-stable/drivers/net/ethernet/atheros/atl1e/atl1e_main.c
-@@ -1883,8 +1883,7 @@ static netdev_tx_t atl1e_xmit_frame(stru
- return NETDEV_TX_OK;
- }
- tpd_req = atl1e_cal_tdp_req(skb);
-- if (!spin_trylock_irqsave(&adapter->tx_lock, flags))
-- return NETDEV_TX_LOCKED;
-+ spin_lock_irqsave(&adapter->tx_lock, flags);
-
- if (atl1e_tpd_avail(adapter) < tpd_req) {
- /* no enough descriptor, just stop queue */
-Index: linux-stable/drivers/net/ethernet/chelsio/cxgb/sge.c
-===================================================================
---- linux-stable.orig/drivers/net/ethernet/chelsio/cxgb/sge.c
-+++ linux-stable/drivers/net/ethernet/chelsio/cxgb/sge.c
-@@ -1663,8 +1663,7 @@ static int t1_sge_tx(struct sk_buff *skb
- struct cmdQ *q = &sge->cmdQ[qid];
- unsigned int credits, pidx, genbit, count, use_sched_skb = 0;
-
-- if (!spin_trylock(&q->lock))
-- return NETDEV_TX_LOCKED;
-+ spin_lock(&q->lock);
-
- reclaim_completed_tx(sge, q);
-
-Index: linux-stable/drivers/net/ethernet/neterion/s2io.c
-===================================================================
---- linux-stable.orig/drivers/net/ethernet/neterion/s2io.c
-+++ linux-stable/drivers/net/ethernet/neterion/s2io.c
-@@ -4089,12 +4089,7 @@ static netdev_tx_t s2io_xmit(struct sk_b
- [skb->priority & (MAX_TX_FIFOS - 1)];
- fifo = &mac_control->fifos[queue];
-
-- if (do_spin_lock)
-- spin_lock_irqsave(&fifo->tx_lock, flags);
-- else {
-- if (unlikely(!spin_trylock_irqsave(&fifo->tx_lock, flags)))
-- return NETDEV_TX_LOCKED;
-- }
-+ spin_lock_irqsave(&fifo->tx_lock, flags);
-
- if (sp->config.multiq) {
- if (__netif_subqueue_stopped(dev, fifo->fifo_no)) {
-Index: linux-stable/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
-===================================================================
---- linux-stable.orig/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
-+++ linux-stable/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
-@@ -2141,10 +2141,8 @@ static int pch_gbe_xmit_frame(struct sk_
- struct pch_gbe_tx_ring *tx_ring = adapter->tx_ring;
- unsigned long flags;
-
-- if (!spin_trylock_irqsave(&tx_ring->tx_lock, flags)) {
-- /* Collision - tell upper layer to requeue */
-- return NETDEV_TX_LOCKED;
-- }
-+ spin_lock_irqsave(&tx_ring->tx_lock, flags);
-+
- if (unlikely(!PCH_GBE_DESC_UNUSED(tx_ring))) {
- netif_stop_queue(netdev);
- spin_unlock_irqrestore(&tx_ring->tx_lock, flags);
-Index: linux-stable/drivers/net/ethernet/tehuti/tehuti.c
-===================================================================
---- linux-stable.orig/drivers/net/ethernet/tehuti/tehuti.c
-+++ linux-stable/drivers/net/ethernet/tehuti/tehuti.c
-@@ -1629,13 +1629,8 @@ static netdev_tx_t bdx_tx_transmit(struc
- unsigned long flags;
-
- ENTER;
-- local_irq_save(flags);
-- if (!spin_trylock(&priv->tx_lock)) {
-- local_irq_restore(flags);
-- DBG("%s[%s]: TX locked, returning NETDEV_TX_LOCKED\n",
-- BDX_DRV_NAME, ndev->name);
-- return NETDEV_TX_LOCKED;
-- }
-+
-+ spin_lock_irqsave(&priv->tx_lock, flags);
-
- /* build tx descriptor */
- BDX_ASSERT(f->m.wptr >= f->m.memsz); /* started with valid wptr */
-Index: linux-stable/drivers/net/rionet.c
-===================================================================
---- linux-stable.orig/drivers/net/rionet.c
-+++ linux-stable/drivers/net/rionet.c
-@@ -174,11 +174,7 @@ static int rionet_start_xmit(struct sk_b
- unsigned long flags;
- int add_num = 1;
-
-- local_irq_save(flags);
-- if (!spin_trylock(&rnet->tx_lock)) {
-- local_irq_restore(flags);
-- return NETDEV_TX_LOCKED;
-- }
-+ spin_lock_irqsave(&rnet->tx_lock, flags);
-
- if (is_multicast_ether_addr(eth->h_dest))
- add_num = nets[rnet->mport->id].nact;
-Index: linux-stable/drivers/net/ethernet/3com/3c59x.c
-===================================================================
---- linux-stable.orig/drivers/net/ethernet/3com/3c59x.c
-+++ linux-stable/drivers/net/ethernet/3com/3c59x.c
-@@ -842,9 +842,9 @@ static void poll_vortex(struct net_devic
- {
- struct vortex_private *vp = netdev_priv(dev);
- unsigned long flags;
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- (vp->full_bus_master_rx ? boomerang_interrupt:vortex_interrupt)(dev->irq,dev);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- }
- #endif
-
-@@ -1917,12 +1917,12 @@ static void vortex_tx_timeout(struct net
- * Block interrupts because vortex_interrupt does a bare spin_lock()
- */
- unsigned long flags;
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- if (vp->full_bus_master_tx)
- boomerang_interrupt(dev->irq, dev);
- else
- vortex_interrupt(dev->irq, dev);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- }
- }
-
-Index: linux-stable/drivers/net/ethernet/freescale/gianfar.c
-===================================================================
---- linux-stable.orig/drivers/net/ethernet/freescale/gianfar.c
-+++ linux-stable/drivers/net/ethernet/freescale/gianfar.c
-@@ -135,7 +135,6 @@ static int gfar_poll_sq(struct napi_stru
- static void gfar_netpoll(struct net_device *dev);
- #endif
- int gfar_clean_rx_ring(struct gfar_priv_rx_q *rx_queue, int rx_work_limit);
--static void gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue);
- static void gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
- int amount_pull, struct napi_struct *napi);
- void gfar_halt(struct net_device *dev);
-@@ -1316,7 +1315,7 @@ static int gfar_suspend(struct device *d
-
- if (netif_running(ndev)) {
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- lock_tx_qs(priv);
- lock_rx_qs(priv);
-
-@@ -1334,7 +1333,7 @@ static int gfar_suspend(struct device *d
-
- unlock_rx_qs(priv);
- unlock_tx_qs(priv);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- disable_napi(priv);
-
-@@ -1376,7 +1375,7 @@ static int gfar_resume(struct device *de
- /* Disable Magic Packet mode, in case something
- * else woke us up.
- */
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- lock_tx_qs(priv);
- lock_rx_qs(priv);
-
-@@ -1388,7 +1387,7 @@ static int gfar_resume(struct device *de
-
- unlock_rx_qs(priv);
- unlock_tx_qs(priv);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- netif_device_attach(ndev);
-
-@@ -1716,7 +1715,7 @@ void stop_gfar(struct net_device *dev)
-
-
- /* Lock it down */
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- lock_tx_qs(priv);
- lock_rx_qs(priv);
-
-@@ -1724,7 +1723,7 @@ void stop_gfar(struct net_device *dev)
-
- unlock_rx_qs(priv);
- unlock_tx_qs(priv);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- /* Free the IRQs */
- if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
-@@ -2402,7 +2401,7 @@ void gfar_vlan_mode(struct net_device *d
- u32 tempval;
-
- regs = priv->gfargrp[0].regs;
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- lock_rx_qs(priv);
-
- if (features & NETIF_F_HW_VLAN_CTAG_TX) {
-@@ -2435,7 +2434,7 @@ void gfar_vlan_mode(struct net_device *d
- gfar_change_mtu(dev, dev->mtu);
-
- unlock_rx_qs(priv);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- }
-
- static int gfar_change_mtu(struct net_device *dev, int new_mtu)
-@@ -2531,7 +2530,7 @@ static void gfar_align_skb(struct sk_buf
- }
-
- /* Interrupt Handler for Transmit complete */
--static void gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue)
-+static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue)
- {
- struct net_device *dev = tx_queue->dev;
- struct netdev_queue *txq;
-@@ -2631,6 +2630,7 @@ static void gfar_clean_tx_ring(struct gf
- tx_queue->dirty_tx = bdp;
-
- netdev_tx_completed_queue(txq, howmany, bytes_sent);
-+ return howmany;
- }
-
- static void gfar_schedule_cleanup(struct gfar_priv_grp *gfargrp)
-@@ -2952,10 +2952,14 @@ static int gfar_poll(struct napi_struct
- tx_queue = priv->tx_queue[i];
- /* run Tx cleanup to completion */
- if (tx_queue->tx_skbuff[tx_queue->skb_dirtytx]) {
-- gfar_clean_tx_ring(tx_queue);
-- has_tx_work = 1;
-+ int ret;
-+
-+ ret = gfar_clean_tx_ring(tx_queue);
-+ if (ret)
-+ has_tx_work++;
- }
- }
-+ work_done += has_tx_work;
-
- for_each_set_bit(i, &gfargrp->rx_bit_map, priv->num_rx_queues) {
- /* skip queue if not active */
-@@ -3105,7 +3109,7 @@ static void adjust_link(struct net_devic
- struct phy_device *phydev = priv->phydev;
- int new_state = 0;
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- lock_tx_qs(priv);
-
- if (phydev->link) {
-@@ -3179,7 +3183,7 @@ static void adjust_link(struct net_devic
- if (new_state && netif_msg_link(priv))
- phy_print_status(phydev);
- unlock_tx_qs(priv);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- }
-
- /* Update the hash table based on the current list of multicast
-@@ -3385,14 +3389,14 @@ static irqreturn_t gfar_error(int irq, v
- dev->stats.tx_dropped++;
- atomic64_inc(&priv->extra_stats.tx_underrun);
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- lock_tx_qs(priv);
-
- /* Reactivate the Tx Queues */
- gfar_write(&regs->tstat, gfargrp->tstat);
-
- unlock_tx_qs(priv);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- }
- netif_dbg(priv, tx_err, dev, "Transmit Error\n");
- }
-Index: linux-stable/drivers/net/ethernet/freescale/gianfar_ethtool.c
-===================================================================
---- linux-stable.orig/drivers/net/ethernet/freescale/gianfar_ethtool.c
-+++ linux-stable/drivers/net/ethernet/freescale/gianfar_ethtool.c
-@@ -500,7 +500,7 @@ static int gfar_sringparam(struct net_de
- /* Halt TX and RX, and process the frames which
- * have already been received
- */
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- lock_tx_qs(priv);
- lock_rx_qs(priv);
-
-@@ -508,7 +508,7 @@ static int gfar_sringparam(struct net_de
-
- unlock_rx_qs(priv);
- unlock_tx_qs(priv);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- for (i = 0; i < priv->num_rx_queues; i++)
- gfar_clean_rx_ring(priv->rx_queue[i],
-@@ -623,7 +623,7 @@ int gfar_set_features(struct net_device
- /* Halt TX and RX, and process the frames which
- * have already been received
- */
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- lock_tx_qs(priv);
- lock_rx_qs(priv);
-
-@@ -631,7 +631,7 @@ int gfar_set_features(struct net_device
-
- unlock_tx_qs(priv);
- unlock_rx_qs(priv);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- for (i = 0; i < priv->num_rx_queues; i++)
- gfar_clean_rx_ring(priv->rx_queue[i],
-Index: linux-stable/drivers/net/ethernet/freescale/gianfar_sysfs.c
-===================================================================
---- linux-stable.orig/drivers/net/ethernet/freescale/gianfar_sysfs.c
-+++ linux-stable/drivers/net/ethernet/freescale/gianfar_sysfs.c
-@@ -67,7 +67,7 @@ static ssize_t gfar_set_bd_stash(struct
- return count;
-
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- lock_rx_qs(priv);
-
- /* Set the new stashing value */
-@@ -83,7 +83,7 @@ static ssize_t gfar_set_bd_stash(struct
- gfar_write(&regs->attr, temp);
-
- unlock_rx_qs(priv);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- return count;
- }
-@@ -111,7 +111,7 @@ static ssize_t gfar_set_rx_stash_size(st
- if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BUF_STASHING))
- return count;
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- lock_rx_qs(priv);
-
- if (length > priv->rx_buffer_size)
-@@ -139,7 +139,7 @@ static ssize_t gfar_set_rx_stash_size(st
-
- out:
- unlock_rx_qs(priv);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- return count;
- }
-@@ -170,7 +170,7 @@ static ssize_t gfar_set_rx_stash_index(s
- if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BUF_STASHING))
- return count;
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- lock_rx_qs(priv);
-
- if (index > priv->rx_stash_size)
-@@ -188,7 +188,7 @@ static ssize_t gfar_set_rx_stash_index(s
-
- out:
- unlock_rx_qs(priv);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- return count;
- }
-@@ -218,7 +218,7 @@ static ssize_t gfar_set_fifo_threshold(s
- if (length > GFAR_MAX_FIFO_THRESHOLD)
- return count;
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- lock_tx_qs(priv);
-
- priv->fifo_threshold = length;
-@@ -229,7 +229,7 @@ static ssize_t gfar_set_fifo_threshold(s
- gfar_write(&regs->fifo_tx_thr, temp);
-
- unlock_tx_qs(priv);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- return count;
- }
-@@ -258,7 +258,7 @@ static ssize_t gfar_set_fifo_starve(stru
- if (num > GFAR_MAX_FIFO_STARVE)
- return count;
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- lock_tx_qs(priv);
-
- priv->fifo_starve = num;
-@@ -269,7 +269,7 @@ static ssize_t gfar_set_fifo_starve(stru
- gfar_write(&regs->fifo_tx_starve, temp);
-
- unlock_tx_qs(priv);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- return count;
- }
-@@ -299,7 +299,7 @@ static ssize_t gfar_set_fifo_starve_off(
- if (num > GFAR_MAX_FIFO_STARVE_OFF)
- return count;
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- lock_tx_qs(priv);
-
- priv->fifo_starve_off = num;
-@@ -310,7 +310,7 @@ static ssize_t gfar_set_fifo_starve_off(
- gfar_write(&regs->fifo_tx_starve_shutoff, temp);
-
- unlock_tx_qs(priv);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- return count;
- }
-Index: linux-stable/drivers/usb/host/ohci-hcd.c
-===================================================================
---- linux-stable.orig/drivers/usb/host/ohci-hcd.c
-+++ linux-stable/drivers/usb/host/ohci-hcd.c
-@@ -864,9 +864,13 @@ static irqreturn_t ohci_irq (struct usb_
- }
-
- if (ints & OHCI_INTR_WDH) {
-- spin_lock (&ohci->lock);
-- dl_done_list (ohci);
-- spin_unlock (&ohci->lock);
-+ if (ohci->hcca->done_head == 0) {
-+ ints &= ~OHCI_INTR_WDH;
-+ } else {
-+ spin_lock (&ohci->lock);
-+ dl_done_list (ohci);
-+ spin_unlock (&ohci->lock);
-+ }
- }
-
- if (quirk_zfmicro(ohci) && (ints & OHCI_INTR_SF)) {
-Index: linux-stable/include/linux/percpu.h
-===================================================================
---- linux-stable.orig/include/linux/percpu.h
-+++ linux-stable/include/linux/percpu.h
-@@ -49,6 +49,31 @@
- preempt_enable(); \
- } while (0)
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+# define get_local_var(var) get_cpu_var(var)
-+# define put_local_var(var) put_cpu_var(var)
-+# define get_local_ptr(var) get_cpu_ptr(var)
-+# define put_local_ptr(var) put_cpu_ptr(var)
-+#else
-+# define get_local_var(var) (*({ \
-+ migrate_disable(); \
-+ &__get_cpu_var(var); }))
-+
-+# define put_local_var(var) do { \
-+ (void)&(var); \
-+ migrate_enable(); \
-+} while (0)
-+
-+# define get_local_ptr(var) ({ \
-+ migrate_disable(); \
-+ this_cpu_ptr(var); })
-+
-+# define put_local_ptr(var) do { \
-+ (void)(var); \
-+ migrate_enable(); \
-+} while (0)
-+#endif
-+
- /* minimum unit size, also is the maximum supported allocation size */
- #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10)
-
-Index: linux-stable/include/linux/locallock.h
-===================================================================
---- /dev/null
-+++ linux-stable/include/linux/locallock.h
-@@ -0,0 +1,270 @@
-+#ifndef _LINUX_LOCALLOCK_H
-+#define _LINUX_LOCALLOCK_H
-+
-+#include <linux/percpu.h>
-+#include <linux/spinlock.h>
-+
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+
-+#ifdef CONFIG_DEBUG_SPINLOCK
-+# define LL_WARN(cond) WARN_ON(cond)
-+#else
-+# define LL_WARN(cond) do { } while (0)
-+#endif
-+
-+/*
-+ * per cpu lock based substitute for local_irq_*()
-+ */
-+struct local_irq_lock {
-+ spinlock_t lock;
-+ struct task_struct *owner;
-+ int nestcnt;
-+ unsigned long flags;
-+};
-+
-+#define DEFINE_LOCAL_IRQ_LOCK(lvar) \
-+ DEFINE_PER_CPU(struct local_irq_lock, lvar) = { \
-+ .lock = __SPIN_LOCK_UNLOCKED((lvar).lock) }
-+
-+#define DECLARE_LOCAL_IRQ_LOCK(lvar) \
-+ DECLARE_PER_CPU(struct local_irq_lock, lvar)
-+
-+#define local_irq_lock_init(lvar) \
-+ do { \
-+ int __cpu; \
-+ for_each_possible_cpu(__cpu) \
-+ spin_lock_init(&per_cpu(lvar, __cpu).lock); \
-+ } while (0)
-+
-+/*
-+ * spin_lock|trylock|unlock_local flavour that does not migrate disable
-+ * used for __local_lock|trylock|unlock where get_local_var/put_local_var
-+ * already takes care of the migrate_disable/enable
-+ * for CONFIG_PREEMPT_BASE map to the normal spin_* calls.
-+ */
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+# define spin_lock_local(lock) rt_spin_lock(lock)
-+# define spin_trylock_local(lock) rt_spin_trylock(lock)
-+# define spin_unlock_local(lock) rt_spin_unlock(lock)
-+#else
-+# define spin_lock_local(lock) spin_lock(lock)
-+# define spin_trylock_local(lock) spin_trylock(lock)
-+# define spin_unlock_local(lock) spin_unlock(lock)
-+#endif
-+
-+static inline void __local_lock(struct local_irq_lock *lv)
-+{
-+ if (lv->owner != current) {
-+ spin_lock_local(&lv->lock);
-+ LL_WARN(lv->owner);
-+ LL_WARN(lv->nestcnt);
-+ lv->owner = current;
-+ }
-+ lv->nestcnt++;
-+}
-+
-+#define local_lock(lvar) \
-+ do { __local_lock(&get_local_var(lvar)); } while (0)
-+
-+static inline int __local_trylock(struct local_irq_lock *lv)
-+{
-+ if (lv->owner != current && spin_trylock_local(&lv->lock)) {
-+ LL_WARN(lv->owner);
-+ LL_WARN(lv->nestcnt);
-+ lv->owner = current;
-+ lv->nestcnt = 1;
-+ return 1;
-+ }
-+ return 0;
-+}
-+
-+#define local_trylock(lvar) \
-+ ({ \
-+ int __locked; \
-+ __locked = __local_trylock(&get_local_var(lvar)); \
-+ if (!__locked) \
-+ put_local_var(lvar); \
-+ __locked; \
-+ })
-+
-+static inline void __local_unlock(struct local_irq_lock *lv)
-+{
-+ LL_WARN(lv->nestcnt == 0);
-+ LL_WARN(lv->owner != current);
-+ if (--lv->nestcnt)
-+ return;
-+
-+ lv->owner = NULL;
-+ spin_unlock_local(&lv->lock);
-+}
-+
-+#define local_unlock(lvar) \
-+ do { \
-+ __local_unlock(&__get_cpu_var(lvar)); \
-+ put_local_var(lvar); \
-+ } while (0)
-+
-+static inline void __local_lock_irq(struct local_irq_lock *lv)
-+{
-+ spin_lock_irqsave(&lv->lock, lv->flags);
-+ LL_WARN(lv->owner);
-+ LL_WARN(lv->nestcnt);
-+ lv->owner = current;
-+ lv->nestcnt = 1;
-+}
-+
-+#define local_lock_irq(lvar) \
-+ do { __local_lock_irq(&get_local_var(lvar)); } while (0)
-+
-+#define local_lock_irq_on(lvar, cpu) \
-+ do { __local_lock_irq(&per_cpu(lvar, cpu)); } while (0)
-+
-+static inline void __local_unlock_irq(struct local_irq_lock *lv)
-+{
-+ LL_WARN(!lv->nestcnt);
-+ LL_WARN(lv->owner != current);
-+ lv->owner = NULL;
-+ lv->nestcnt = 0;
-+ spin_unlock_irq(&lv->lock);
-+}
-+
-+#define local_unlock_irq(lvar) \
-+ do { \
-+ __local_unlock_irq(&__get_cpu_var(lvar)); \
-+ put_local_var(lvar); \
-+ } while (0)
-+
-+#define local_unlock_irq_on(lvar, cpu) \
-+ do { \
-+ __local_unlock_irq(&per_cpu(lvar, cpu)); \
-+ } while (0)
-+
-+static inline int __local_lock_irqsave(struct local_irq_lock *lv)
-+{
-+ if (lv->owner != current) {
-+ __local_lock_irq(lv);
-+ return 0;
-+ } else {
-+ lv->nestcnt++;
-+ return 1;
-+ }
-+}
-+
-+#define local_lock_irqsave(lvar, _flags) \
-+ do { \
-+ if (__local_lock_irqsave(&get_local_var(lvar))) \
-+ put_local_var(lvar); \
-+ _flags = __get_cpu_var(lvar).flags; \
-+ } while (0)
-+
-+#define local_lock_irqsave_on(lvar, _flags, cpu) \
-+ do { \
-+ __local_lock_irqsave(&per_cpu(lvar, cpu)); \
-+ _flags = per_cpu(lvar, cpu).flags; \
-+ } while (0)
-+
-+static inline int __local_unlock_irqrestore(struct local_irq_lock *lv,
-+ unsigned long flags)
-+{
-+ LL_WARN(!lv->nestcnt);
-+ LL_WARN(lv->owner != current);
-+ if (--lv->nestcnt)
-+ return 0;
-+
-+ lv->owner = NULL;
-+ spin_unlock_irqrestore(&lv->lock, lv->flags);
-+ return 1;
-+}
-+
-+#define local_unlock_irqrestore(lvar, flags) \
-+ do { \
-+ if (__local_unlock_irqrestore(&__get_cpu_var(lvar), flags)) \
-+ put_local_var(lvar); \
-+ } while (0)
-+
-+#define local_unlock_irqrestore_on(lvar, flags, cpu) \
-+ do { \
-+ __local_unlock_irqrestore(&per_cpu(lvar, cpu), flags); \
-+ } while (0)
-+
-+#define local_spin_trylock_irq(lvar, lock) \
-+ ({ \
-+ int __locked; \
-+ local_lock_irq(lvar); \
-+ __locked = spin_trylock(lock); \
-+ if (!__locked) \
-+ local_unlock_irq(lvar); \
-+ __locked; \
-+ })
-+
-+#define local_spin_lock_irq(lvar, lock) \
-+ do { \
-+ local_lock_irq(lvar); \
-+ spin_lock(lock); \
-+ } while (0)
-+
-+#define local_spin_unlock_irq(lvar, lock) \
-+ do { \
-+ spin_unlock(lock); \
-+ local_unlock_irq(lvar); \
-+ } while (0)
-+
-+#define local_spin_lock_irqsave(lvar, lock, flags) \
-+ do { \
-+ local_lock_irqsave(lvar, flags); \
-+ spin_lock(lock); \
-+ } while (0)
-+
-+#define local_spin_unlock_irqrestore(lvar, lock, flags) \
-+ do { \
-+ spin_unlock(lock); \
-+ local_unlock_irqrestore(lvar, flags); \
-+ } while (0)
-+
-+#define get_locked_var(lvar, var) \
-+ (*({ \
-+ local_lock(lvar); \
-+ &__get_cpu_var(var); \
-+ }))
-+
-+#define put_locked_var(lvar, var) local_unlock(lvar);
-+
-+#define local_lock_cpu(lvar) \
-+ ({ \
-+ local_lock(lvar); \
-+ smp_processor_id(); \
-+ })
-+
-+#define local_unlock_cpu(lvar) local_unlock(lvar)
-+
-+#else /* PREEMPT_RT_BASE */
-+
-+#define DEFINE_LOCAL_IRQ_LOCK(lvar) __typeof__(const int) lvar
-+#define DECLARE_LOCAL_IRQ_LOCK(lvar) extern __typeof__(const int) lvar
-+
-+static inline void local_irq_lock_init(int lvar) { }
-+
-+#define local_lock(lvar) preempt_disable()
-+#define local_unlock(lvar) preempt_enable()
-+#define local_lock_irq(lvar) local_irq_disable()
-+#define local_unlock_irq(lvar) local_irq_enable()
-+#define local_lock_irqsave(lvar, flags) local_irq_save(flags)
-+#define local_unlock_irqrestore(lvar, flags) local_irq_restore(flags)
-+
-+#define local_spin_trylock_irq(lvar, lock) spin_trylock_irq(lock)
-+#define local_spin_lock_irq(lvar, lock) spin_lock_irq(lock)
-+#define local_spin_unlock_irq(lvar, lock) spin_unlock_irq(lock)
-+#define local_spin_lock_irqsave(lvar, lock, flags) \
-+ spin_lock_irqsave(lock, flags)
-+#define local_spin_unlock_irqrestore(lvar, lock, flags) \
-+ spin_unlock_irqrestore(lock, flags)
-+
-+#define get_locked_var(lvar, var) get_cpu_var(var)
-+#define put_locked_var(lvar, var) put_cpu_var(var)
-+
-+#define local_lock_cpu(lvar) get_cpu()
-+#define local_unlock_cpu(lvar) put_cpu()
-+
-+#endif
-+
-+#endif
-Index: linux-stable/include/linux/smp.h
-===================================================================
---- linux-stable.orig/include/linux/smp.h
-+++ linux-stable/include/linux/smp.h
-@@ -182,6 +182,9 @@ static inline void kick_all_cpus_sync(vo
- #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
- #define put_cpu() preempt_enable()
-
-+#define get_cpu_light() ({ migrate_disable(); smp_processor_id(); })
-+#define put_cpu_light() migrate_enable()
-+
- /*
- * Callback to arch code if there's nosmp or maxcpus=0 on the
- * boot command line:
-Index: linux-stable/mm/swap.c
-===================================================================
---- linux-stable.orig/mm/swap.c
-+++ linux-stable/mm/swap.c
-@@ -31,6 +31,7 @@
- #include <linux/memcontrol.h>
- #include <linux/gfp.h>
- #include <linux/uio.h>
-+#include <linux/locallock.h>
-
- #include "internal.h"
-
-@@ -44,6 +45,9 @@ static DEFINE_PER_CPU(struct pagevec, lr
- static DEFINE_PER_CPU(struct pagevec, lru_rotate_pvecs);
- static DEFINE_PER_CPU(struct pagevec, lru_deactivate_pvecs);
-
-+static DEFINE_LOCAL_IRQ_LOCK(rotate_lock);
-+static DEFINE_LOCAL_IRQ_LOCK(swapvec_lock);
-+
- /*
- * This path almost never happens for VM activity - pages are normally
- * freed via pagevecs. But it gets used by networking.
-@@ -440,11 +444,11 @@ void rotate_reclaimable_page(struct page
- unsigned long flags;
-
- page_cache_get(page);
-- local_irq_save(flags);
-+ local_lock_irqsave(rotate_lock, flags);
- pvec = &__get_cpu_var(lru_rotate_pvecs);
- if (!pagevec_add(pvec, page))
- pagevec_move_tail(pvec);
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(rotate_lock, flags);
- }
- }
-
-@@ -495,12 +499,13 @@ static bool need_activate_page_drain(int
- void activate_page(struct page *page)
- {
- if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
-- struct pagevec *pvec = &get_cpu_var(activate_page_pvecs);
-+ struct pagevec *pvec = &get_locked_var(swapvec_lock,
-+ activate_page_pvecs);
-
- page_cache_get(page);
- if (!pagevec_add(pvec, page))
- pagevec_lru_move_fn(pvec, __activate_page, NULL);
-- put_cpu_var(activate_page_pvecs);
-+ put_locked_var(swapvec_lock, activate_page_pvecs);
- }
- }
-
-@@ -526,7 +531,7 @@ void activate_page(struct page *page)
-
- static void __lru_cache_activate_page(struct page *page)
- {
-- struct pagevec *pvec = &get_cpu_var(lru_add_pvec);
-+ struct pagevec *pvec = &get_locked_var(swapvec_lock, lru_add_pvec);
- int i;
-
- /*
-@@ -548,7 +553,7 @@ static void __lru_cache_activate_page(st
- }
- }
-
-- put_cpu_var(lru_add_pvec);
-+ put_locked_var(swapvec_lock, lru_add_pvec);
- }
-
- /*
-@@ -588,13 +593,13 @@ EXPORT_SYMBOL(mark_page_accessed);
- */
- void __lru_cache_add(struct page *page)
- {
-- struct pagevec *pvec = &get_cpu_var(lru_add_pvec);
-+ struct pagevec *pvec = &get_locked_var(swapvec_lock, lru_add_pvec);
-
- page_cache_get(page);
- if (!pagevec_space(pvec))
- __pagevec_lru_add(pvec);
- pagevec_add(pvec, page);
-- put_cpu_var(lru_add_pvec);
-+ put_locked_var(swapvec_lock, lru_add_pvec);
- }
- EXPORT_SYMBOL(__lru_cache_add);
-
-@@ -717,9 +722,9 @@ void lru_add_drain_cpu(int cpu)
- unsigned long flags;
-
- /* No harm done if a racing interrupt already did this */
-- local_irq_save(flags);
-+ local_lock_irqsave(rotate_lock, flags);
- pagevec_move_tail(pvec);
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(rotate_lock, flags);
- }
-
- pvec = &per_cpu(lru_deactivate_pvecs, cpu);
-@@ -747,18 +752,19 @@ void deactivate_page(struct page *page)
- return;
-
- if (likely(get_page_unless_zero(page))) {
-- struct pagevec *pvec = &get_cpu_var(lru_deactivate_pvecs);
-+ struct pagevec *pvec = &get_locked_var(swapvec_lock,
-+ lru_deactivate_pvecs);
-
- if (!pagevec_add(pvec, page))
- pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL);
-- put_cpu_var(lru_deactivate_pvecs);
-+ put_locked_var(swapvec_lock, lru_deactivate_pvecs);
- }
- }
-
- void lru_add_drain(void)
- {
-- lru_add_drain_cpu(get_cpu());
-- put_cpu();
-+ lru_add_drain_cpu(local_lock_cpu(swapvec_lock));
-+ local_unlock_cpu(swapvec_lock);
- }
-
- static void lru_add_drain_per_cpu(struct work_struct *dummy)
-Index: linux-stable/include/linux/vmstat.h
-===================================================================
---- linux-stable.orig/include/linux/vmstat.h
-+++ linux-stable/include/linux/vmstat.h
-@@ -29,7 +29,9 @@ DECLARE_PER_CPU(struct vm_event_state, v
-
- static inline void __count_vm_event(enum vm_event_item item)
- {
-+ preempt_disable_rt();
- __this_cpu_inc(vm_event_states.event[item]);
-+ preempt_enable_rt();
- }
-
- static inline void count_vm_event(enum vm_event_item item)
-@@ -39,7 +41,9 @@ static inline void count_vm_event(enum v
-
- static inline void __count_vm_events(enum vm_event_item item, long delta)
- {
-+ preempt_disable_rt();
- __this_cpu_add(vm_event_states.event[item], delta);
-+ preempt_enable_rt();
- }
-
- static inline void count_vm_events(enum vm_event_item item, long delta)
-Index: linux-stable/mm/vmstat.c
-===================================================================
---- linux-stable.orig/mm/vmstat.c
-+++ linux-stable/mm/vmstat.c
-@@ -217,6 +217,7 @@ void __mod_zone_page_state(struct zone *
- long x;
- long t;
-
-+ preempt_disable_rt();
- x = delta + __this_cpu_read(*p);
-
- t = __this_cpu_read(pcp->stat_threshold);
-@@ -226,6 +227,7 @@ void __mod_zone_page_state(struct zone *
- x = 0;
- }
- __this_cpu_write(*p, x);
-+ preempt_enable_rt();
- }
- EXPORT_SYMBOL(__mod_zone_page_state);
-
-@@ -258,6 +260,7 @@ void __inc_zone_state(struct zone *zone,
- s8 __percpu *p = pcp->vm_stat_diff + item;
- s8 v, t;
-
-+ preempt_disable_rt();
- v = __this_cpu_inc_return(*p);
- t = __this_cpu_read(pcp->stat_threshold);
- if (unlikely(v > t)) {
-@@ -266,6 +269,7 @@ void __inc_zone_state(struct zone *zone,
- zone_page_state_add(v + overstep, zone, item);
- __this_cpu_write(*p, -overstep);
- }
-+ preempt_enable_rt();
- }
-
- void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
-@@ -280,6 +284,7 @@ void __dec_zone_state(struct zone *zone,
- s8 __percpu *p = pcp->vm_stat_diff + item;
- s8 v, t;
-
-+ preempt_disable_rt();
- v = __this_cpu_dec_return(*p);
- t = __this_cpu_read(pcp->stat_threshold);
- if (unlikely(v < - t)) {
-@@ -288,6 +293,7 @@ void __dec_zone_state(struct zone *zone,
- zone_page_state_add(v - overstep, zone, item);
- __this_cpu_write(*p, overstep);
- }
-+ preempt_enable_rt();
- }
-
- void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
-Index: linux-stable/arch/arm/kernel/process.c
-===================================================================
---- linux-stable.orig/arch/arm/kernel/process.c
-+++ linux-stable/arch/arm/kernel/process.c
-@@ -432,6 +432,30 @@ unsigned long arch_randomize_brk(struct
- }
-
- #ifdef CONFIG_MMU
-+/*
-+ * CONFIG_SPLIT_PTLOCK_CPUS results in a page->ptl lock. If the lock is not
-+ * initialized by pgtable_page_ctor() then a coredump of the vector page will
-+ * fail.
-+ */
-+static int __init vectors_user_mapping_init_page(void)
-+{
-+ struct page *page;
-+ unsigned long addr = 0xffff0000;
-+ pgd_t *pgd;
-+ pud_t *pud;
-+ pmd_t *pmd;
-+
-+ pgd = pgd_offset_k(addr);
-+ pud = pud_offset(pgd, addr);
-+ pmd = pmd_offset(pud, addr);
-+ page = pmd_page(*(pmd));
-+
-+ pgtable_page_ctor(page);
-+
-+ return 0;
-+}
-+late_initcall(vectors_user_mapping_init_page);
-+
- #ifdef CONFIG_KUSER_HELPERS
- /*
- * The vectors page is always readable from user space for the
-Index: linux-stable/mm/bounce.c
-===================================================================
---- linux-stable.orig/mm/bounce.c
-+++ linux-stable/mm/bounce.c
-@@ -51,11 +51,11 @@ static void bounce_copy_vec(struct bio_v
- unsigned long flags;
- unsigned char *vto;
-
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- vto = kmap_atomic(to->bv_page);
- memcpy(vto + to->bv_offset, vfrom, to->bv_len);
- kunmap_atomic(vto);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- }
-
- #else /* CONFIG_HIGHMEM */
-Index: linux-stable/init/Kconfig
-===================================================================
---- linux-stable.orig/init/Kconfig
-+++ linux-stable/init/Kconfig
-@@ -602,7 +602,7 @@ config RCU_FANOUT_EXACT
-
- config RCU_FAST_NO_HZ
- bool "Accelerate last non-dyntick-idle CPU's grace periods"
-- depends on NO_HZ_COMMON && SMP
-+ depends on NO_HZ_COMMON && SMP && !PREEMPT_RT_FULL
- default n
- help
- This option permits CPUs to enter dynticks-idle state even if
-@@ -629,7 +629,7 @@ config TREE_RCU_TRACE
- config RCU_BOOST
- bool "Enable RCU priority boosting"
- depends on RT_MUTEXES && PREEMPT_RCU
-- default n
-+ default y if PREEMPT_RT_FULL
- help
- This option boosts the priority of preempted RCU readers that
- block the current preemptible RCU grace period for too long.
-@@ -1035,6 +1035,7 @@ config CFS_BANDWIDTH
- config RT_GROUP_SCHED
- bool "Group scheduling for SCHED_RR/FIFO"
- depends on CGROUP_SCHED
-+ depends on !PREEMPT_RT_FULL
- default n
- help
- This feature lets you explicitly allocate real CPU bandwidth
-@@ -1563,6 +1564,7 @@ choice
-
- config SLAB
- bool "SLAB"
-+ depends on !PREEMPT_RT_FULL
- help
- The regular slab allocator that is established and known to work
- well in all environments. It organizes cache hot objects in
-@@ -1581,6 +1583,7 @@ config SLUB
- config SLOB
- depends on EXPERT
- bool "SLOB (Simple Allocator)"
-+ depends on !PREEMPT_RT_FULL
- help
- SLOB replaces the stock allocator with a drastically simpler
- allocator. SLOB is generally more space efficient but
-Index: linux-stable/mm/slab.h
-===================================================================
---- linux-stable.orig/mm/slab.h
-+++ linux-stable/mm/slab.h
-@@ -273,7 +273,11 @@ static inline struct kmem_cache *cache_f
- * The slab lists for all objects.
- */
- struct kmem_cache_node {
-+#ifdef CONFIG_SLUB
-+ raw_spinlock_t list_lock;
-+#else
- spinlock_t list_lock;
-+#endif
-
- #ifdef CONFIG_SLAB
- struct list_head slabs_partial; /* partial list first, better asm code */
-Index: linux-stable/mm/slub.c
-===================================================================
---- linux-stable.orig/mm/slub.c
-+++ linux-stable/mm/slub.c
-@@ -1109,7 +1109,7 @@ static noinline struct kmem_cache_node *
- {
- struct kmem_cache_node *n = get_node(s, page_to_nid(page));
-
-- spin_lock_irqsave(&n->list_lock, *flags);
-+ raw_spin_lock_irqsave(&n->list_lock, *flags);
- slab_lock(page);
-
- if (!check_slab(s, page))
-@@ -1157,7 +1157,7 @@ out:
-
- fail:
- slab_unlock(page);
-- spin_unlock_irqrestore(&n->list_lock, *flags);
-+ raw_spin_unlock_irqrestore(&n->list_lock, *flags);
- slab_fix(s, "Object at 0x%p not freed", object);
- return NULL;
- }
-@@ -1310,6 +1310,12 @@ static inline void slab_free_hook(struct
-
- #endif /* CONFIG_SLUB_DEBUG */
-
-+struct slub_free_list {
-+ raw_spinlock_t lock;
-+ struct list_head list;
-+};
-+static DEFINE_PER_CPU(struct slub_free_list, slub_free_list);
-+
- /*
- * Slab allocation and freeing
- */
-@@ -1331,10 +1337,15 @@ static struct page *allocate_slab(struct
- struct page *page;
- struct kmem_cache_order_objects oo = s->oo;
- gfp_t alloc_gfp;
-+ bool enableirqs;
-
- flags &= gfp_allowed_mask;
-
-- if (flags & __GFP_WAIT)
-+ enableirqs = (flags & __GFP_WAIT) != 0;
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ enableirqs |= system_state == SYSTEM_RUNNING;
-+#endif
-+ if (enableirqs)
- local_irq_enable();
-
- flags |= s->allocflags;
-@@ -1374,7 +1385,7 @@ static struct page *allocate_slab(struct
- kmemcheck_mark_unallocated_pages(page, pages);
- }
-
-- if (flags & __GFP_WAIT)
-+ if (enableirqs)
- local_irq_disable();
- if (!page)
- return NULL;
-@@ -1392,8 +1403,10 @@ static void setup_object(struct kmem_cac
- void *object)
- {
- setup_object_debug(s, page, object);
-+#ifndef CONFIG_PREEMPT_RT_FULL
- if (unlikely(s->ctor))
- s->ctor(object);
-+#endif
- }
-
- static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
-@@ -1471,6 +1484,16 @@ static void __free_slab(struct kmem_cach
- __free_memcg_kmem_pages(page, order);
- }
-
-+static void free_delayed(struct list_head *h)
-+{
-+ while(!list_empty(h)) {
-+ struct page *page = list_first_entry(h, struct page, lru);
-+
-+ list_del(&page->lru);
-+ __free_slab(page->slab_cache, page);
-+ }
-+}
-+
- #define need_reserve_slab_rcu \
- (sizeof(((struct page *)NULL)->lru) < sizeof(struct rcu_head))
-
-@@ -1505,6 +1528,12 @@ static void free_slab(struct kmem_cache
- }
-
- call_rcu(head, rcu_free_slab);
-+ } else if (irqs_disabled()) {
-+ struct slub_free_list *f = &__get_cpu_var(slub_free_list);
-+
-+ raw_spin_lock(&f->lock);
-+ list_add(&page->lru, &f->list);
-+ raw_spin_unlock(&f->lock);
- } else
- __free_slab(s, page);
- }
-@@ -1618,7 +1647,7 @@ static void *get_partial_node(struct kme
- if (!n || !n->nr_partial)
- return NULL;
-
-- spin_lock(&n->list_lock);
-+ raw_spin_lock(&n->list_lock);
- list_for_each_entry_safe(page, page2, &n->partial, lru) {
- void *t;
-
-@@ -1643,7 +1672,7 @@ static void *get_partial_node(struct kme
- break;
-
- }
-- spin_unlock(&n->list_lock);
-+ raw_spin_unlock(&n->list_lock);
- return object;
- }
-
-@@ -1886,7 +1915,7 @@ redo:
- * that acquire_slab() will see a slab page that
- * is frozen
- */
-- spin_lock(&n->list_lock);
-+ raw_spin_lock(&n->list_lock);
- }
- } else {
- m = M_FULL;
-@@ -1897,7 +1926,7 @@ redo:
- * slabs from diagnostic functions will not see
- * any frozen slabs.
- */
-- spin_lock(&n->list_lock);
-+ raw_spin_lock(&n->list_lock);
- }
- }
-
-@@ -1932,7 +1961,7 @@ redo:
- goto redo;
-
- if (lock)
-- spin_unlock(&n->list_lock);
-+ raw_spin_unlock(&n->list_lock);
-
- if (m == M_FREE) {
- stat(s, DEACTIVATE_EMPTY);
-@@ -1964,10 +1993,10 @@ static void unfreeze_partials(struct kme
- n2 = get_node(s, page_to_nid(page));
- if (n != n2) {
- if (n)
-- spin_unlock(&n->list_lock);
-+ raw_spin_unlock(&n->list_lock);
-
- n = n2;
-- spin_lock(&n->list_lock);
-+ raw_spin_lock(&n->list_lock);
- }
-
- do {
-@@ -1996,7 +2025,7 @@ static void unfreeze_partials(struct kme
- }
-
- if (n)
-- spin_unlock(&n->list_lock);
-+ raw_spin_unlock(&n->list_lock);
-
- while (discard_page) {
- page = discard_page;
-@@ -2034,14 +2063,21 @@ static void put_cpu_partial(struct kmem_
- pobjects = oldpage->pobjects;
- pages = oldpage->pages;
- if (drain && pobjects > s->cpu_partial) {
-+ struct slub_free_list *f;
- unsigned long flags;
-+ LIST_HEAD(tofree);
- /*
- * partial array is full. Move the existing
- * set to the per node partial list.
- */
- local_irq_save(flags);
- unfreeze_partials(s, this_cpu_ptr(s->cpu_slab));
-+ f = &__get_cpu_var(slub_free_list);
-+ raw_spin_lock(&f->lock);
-+ list_splice_init(&f->list, &tofree);
-+ raw_spin_unlock(&f->lock);
- local_irq_restore(flags);
-+ free_delayed(&tofree);
- oldpage = NULL;
- pobjects = 0;
- pages = 0;
-@@ -2105,7 +2141,22 @@ static bool has_cpu_slab(int cpu, void *
-
- static void flush_all(struct kmem_cache *s)
- {
-+ LIST_HEAD(tofree);
-+ int cpu;
-+
- on_each_cpu_cond(has_cpu_slab, flush_cpu_slab, s, 1, GFP_ATOMIC);
-+ for_each_online_cpu(cpu) {
-+ struct slub_free_list *f;
-+
-+ if (!has_cpu_slab(cpu, s))
-+ continue;
-+
-+ f = &per_cpu(slub_free_list, cpu);
-+ raw_spin_lock_irq(&f->lock);
-+ list_splice_init(&f->list, &tofree);
-+ raw_spin_unlock_irq(&f->lock);
-+ free_delayed(&tofree);
-+ }
- }
-
- /*
-@@ -2133,10 +2184,10 @@ static unsigned long count_partial(struc
- unsigned long x = 0;
- struct page *page;
-
-- spin_lock_irqsave(&n->list_lock, flags);
-+ raw_spin_lock_irqsave(&n->list_lock, flags);
- list_for_each_entry(page, &n->partial, lru)
- x += get_count(page);
-- spin_unlock_irqrestore(&n->list_lock, flags);
-+ raw_spin_unlock_irqrestore(&n->list_lock, flags);
- return x;
- }
-
-@@ -2279,9 +2330,11 @@ static inline void *get_freelist(struct
- static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
- unsigned long addr, struct kmem_cache_cpu *c)
- {
-+ struct slub_free_list *f;
- void *freelist;
- struct page *page;
- unsigned long flags;
-+ LIST_HEAD(tofree);
-
- local_irq_save(flags);
- #ifdef CONFIG_PREEMPT
-@@ -2344,7 +2397,13 @@ load_freelist:
- VM_BUG_ON(!c->page->frozen);
- c->freelist = get_freepointer(s, freelist);
- c->tid = next_tid(c->tid);
-+out:
-+ f = &__get_cpu_var(slub_free_list);
-+ raw_spin_lock(&f->lock);
-+ list_splice_init(&f->list, &tofree);
-+ raw_spin_unlock(&f->lock);
- local_irq_restore(flags);
-+ free_delayed(&tofree);
- return freelist;
-
- new_slab:
-@@ -2362,9 +2421,7 @@ new_slab:
- if (unlikely(!freelist)) {
- if (!(gfpflags & __GFP_NOWARN) && printk_ratelimit())
- slab_out_of_memory(s, gfpflags, node);
--
-- local_irq_restore(flags);
-- return NULL;
-+ goto out;
- }
-
- page = c->page;
-@@ -2379,8 +2436,7 @@ new_slab:
- deactivate_slab(s, page, get_freepointer(s, freelist));
- c->page = NULL;
- c->freelist = NULL;
-- local_irq_restore(flags);
-- return freelist;
-+ goto out;
- }
-
- /*
-@@ -2465,6 +2521,10 @@ redo:
-
- if (unlikely(gfpflags & __GFP_ZERO) && object)
- memset(object, 0, s->object_size);
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ if (unlikely(s->ctor) && object)
-+ s->ctor(object);
-+#endif
-
- slab_post_alloc_hook(s, gfpflags, object);
-
-@@ -2552,7 +2612,7 @@ static void __slab_free(struct kmem_cach
-
- do {
- if (unlikely(n)) {
-- spin_unlock_irqrestore(&n->list_lock, flags);
-+ raw_spin_unlock_irqrestore(&n->list_lock, flags);
- n = NULL;
- }
- prior = page->freelist;
-@@ -2584,7 +2644,7 @@ static void __slab_free(struct kmem_cach
- * Otherwise the list_lock will synchronize with
- * other processors updating the list of slabs.
- */
-- spin_lock_irqsave(&n->list_lock, flags);
-+ raw_spin_lock_irqsave(&n->list_lock, flags);
-
- }
- }
-@@ -2626,7 +2686,7 @@ static void __slab_free(struct kmem_cach
- add_partial(n, page, DEACTIVATE_TO_TAIL);
- stat(s, FREE_ADD_PARTIAL);
- }
-- spin_unlock_irqrestore(&n->list_lock, flags);
-+ raw_spin_unlock_irqrestore(&n->list_lock, flags);
- return;
-
- slab_empty:
-@@ -2641,7 +2701,7 @@ slab_empty:
- remove_full(s, n, page);
- }
-
-- spin_unlock_irqrestore(&n->list_lock, flags);
-+ raw_spin_unlock_irqrestore(&n->list_lock, flags);
- stat(s, FREE_SLAB);
- discard_slab(s, page);
- }
-@@ -2843,7 +2903,7 @@ static void
- init_kmem_cache_node(struct kmem_cache_node *n)
- {
- n->nr_partial = 0;
-- spin_lock_init(&n->list_lock);
-+ raw_spin_lock_init(&n->list_lock);
- INIT_LIST_HEAD(&n->partial);
- #ifdef CONFIG_SLUB_DEBUG
- atomic_long_set(&n->nr_slabs, 0);
-@@ -3433,7 +3493,7 @@ int kmem_cache_shrink(struct kmem_cache
- for (i = 0; i < objects; i++)
- INIT_LIST_HEAD(slabs_by_inuse + i);
-
-- spin_lock_irqsave(&n->list_lock, flags);
-+ raw_spin_lock_irqsave(&n->list_lock, flags);
-
- /*
- * Build lists indexed by the items in use in each slab.
-@@ -3454,7 +3514,7 @@ int kmem_cache_shrink(struct kmem_cache
- for (i = objects - 1; i > 0; i--)
- list_splice(slabs_by_inuse + i, n->partial.prev);
-
-- spin_unlock_irqrestore(&n->list_lock, flags);
-+ raw_spin_unlock_irqrestore(&n->list_lock, flags);
-
- /* Release empty slabs */
- list_for_each_entry_safe(page, t, slabs_by_inuse, lru)
-@@ -3630,6 +3690,12 @@ void __init kmem_cache_init(void)
- {
- static __initdata struct kmem_cache boot_kmem_cache,
- boot_kmem_cache_node;
-+ int cpu;
-+
-+ for_each_possible_cpu(cpu) {
-+ raw_spin_lock_init(&per_cpu(slub_free_list, cpu).lock);
-+ INIT_LIST_HEAD(&per_cpu(slub_free_list, cpu).list);
-+ }
-
- if (debug_guardpage_minorder())
- slub_max_order = 0;
-@@ -3934,7 +4000,7 @@ static int validate_slab_node(struct kme
- struct page *page;
- unsigned long flags;
-
-- spin_lock_irqsave(&n->list_lock, flags);
-+ raw_spin_lock_irqsave(&n->list_lock, flags);
-
- list_for_each_entry(page, &n->partial, lru) {
- validate_slab_slab(s, page, map);
-@@ -3957,7 +4023,7 @@ static int validate_slab_node(struct kme
- atomic_long_read(&n->nr_slabs));
-
- out:
-- spin_unlock_irqrestore(&n->list_lock, flags);
-+ raw_spin_unlock_irqrestore(&n->list_lock, flags);
- return count;
- }
-
-@@ -4147,12 +4213,12 @@ static int list_locations(struct kmem_ca
- if (!atomic_long_read(&n->nr_slabs))
- continue;
-
-- spin_lock_irqsave(&n->list_lock, flags);
-+ raw_spin_lock_irqsave(&n->list_lock, flags);
- list_for_each_entry(page, &n->partial, lru)
- process_slab(&t, s, page, alloc, map);
- list_for_each_entry(page, &n->full, lru)
- process_slab(&t, s, page, alloc, map);
-- spin_unlock_irqrestore(&n->list_lock, flags);
-+ raw_spin_unlock_irqrestore(&n->list_lock, flags);
- }
-
- for (i = 0; i < t.count; i++) {
-Index: linux-stable/mm/memcontrol.c
-===================================================================
---- linux-stable.orig/mm/memcontrol.c
-+++ linux-stable/mm/memcontrol.c
-@@ -2518,7 +2518,7 @@ static void drain_all_stock(struct mem_c
-
- /* Notify other cpus that system-wide "drain" is running */
- get_online_cpus();
-- curcpu = get_cpu();
-+ curcpu = get_cpu_light();
- for_each_online_cpu(cpu) {
- struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu);
- struct mem_cgroup *memcg;
-@@ -2535,7 +2535,7 @@ static void drain_all_stock(struct mem_c
- schedule_work_on(cpu, &stock->work);
- }
- }
-- put_cpu();
-+ put_cpu_light();
-
- if (!sync)
- goto out;
-Index: linux-stable/include/linux/radix-tree.h
-===================================================================
---- linux-stable.orig/include/linux/radix-tree.h
-+++ linux-stable/include/linux/radix-tree.h
-@@ -230,8 +230,13 @@ unsigned long radix_tree_next_hole(struc
- unsigned long index, unsigned long max_scan);
- unsigned long radix_tree_prev_hole(struct radix_tree_root *root,
- unsigned long index, unsigned long max_scan);
-+#ifndef CONFIG_PREEMPT_RT_FULL
- int radix_tree_preload(gfp_t gfp_mask);
- int radix_tree_maybe_preload(gfp_t gfp_mask);
-+#else
-+static inline int radix_tree_preload(gfp_t gm) { return 0; }
-+static inline int radix_tree_maybe_preload(gfp_t gfp_mask) { return 0; }
-+#endif
- void radix_tree_init(void);
- void *radix_tree_tag_set(struct radix_tree_root *root,
- unsigned long index, unsigned int tag);
-@@ -256,7 +261,7 @@ unsigned long radix_tree_locate_item(str
-
- static inline void radix_tree_preload_end(void)
- {
-- preempt_enable();
-+ preempt_enable_nort();
- }
-
- /**
-Index: linux-stable/lib/radix-tree.c
-===================================================================
---- linux-stable.orig/lib/radix-tree.c
-+++ linux-stable/lib/radix-tree.c
-@@ -221,12 +221,13 @@ radix_tree_node_alloc(struct radix_tree_
- * succeed in getting a node here (and never reach
- * kmem_cache_alloc)
- */
-- rtp = &__get_cpu_var(radix_tree_preloads);
-+ rtp = &get_cpu_var(radix_tree_preloads);
- if (rtp->nr) {
- ret = rtp->nodes[rtp->nr - 1];
- rtp->nodes[rtp->nr - 1] = NULL;
- rtp->nr--;
- }
-+ put_cpu_var(radix_tree_preloads);
- }
- if (ret == NULL)
- ret = kmem_cache_alloc(radix_tree_node_cachep, gfp_mask);
-@@ -261,6 +262,7 @@ radix_tree_node_free(struct radix_tree_n
- call_rcu(&node->rcu_head, radix_tree_node_rcu_free);
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * Load up this CPU's radix_tree_node buffer with sufficient objects to
- * ensure that the addition of a single element in the tree cannot fail. On
-@@ -326,6 +328,7 @@ int radix_tree_maybe_preload(gfp_t gfp_m
- return 0;
- }
- EXPORT_SYMBOL(radix_tree_maybe_preload);
-+#endif
-
- /*
- * Return the maximum key which can be store into a
-Index: linux-stable/kernel/panic.c
-===================================================================
---- linux-stable.orig/kernel/panic.c
-+++ linux-stable/kernel/panic.c
-@@ -368,9 +368,11 @@ static u64 oops_id;
-
- static int init_oops_id(void)
- {
-+#ifndef CONFIG_PREEMPT_RT_FULL
- if (!oops_id)
- get_random_bytes(&oops_id, sizeof(oops_id));
- else
-+#endif
- oops_id++;
-
- return 0;
-Index: linux-stable/ipc/mqueue.c
-===================================================================
---- linux-stable.orig/ipc/mqueue.c
-+++ linux-stable/ipc/mqueue.c
-@@ -923,12 +923,17 @@ static inline void pipelined_send(struct
- struct msg_msg *message,
- struct ext_wait_queue *receiver)
- {
-+ /*
-+ * Keep them in one critical section for PREEMPT_RT:
-+ */
-+ preempt_disable_rt();
- receiver->msg = message;
- list_del(&receiver->list);
- receiver->state = STATE_PENDING;
- wake_up_process(receiver->task);
- smp_wmb();
- receiver->state = STATE_READY;
-+ preempt_enable_rt();
- }
-
- /* pipelined_receive() - if there is task waiting in sys_mq_timedsend()
-@@ -942,13 +947,18 @@ static inline void pipelined_receive(str
- wake_up_interruptible(&info->wait_q);
- return;
- }
-- if (msg_insert(sender->msg, info))
-- return;
-- list_del(&sender->list);
-- sender->state = STATE_PENDING;
-- wake_up_process(sender->task);
-- smp_wmb();
-- sender->state = STATE_READY;
-+ /*
-+ * Keep them in one critical section for PREEMPT_RT:
-+ */
-+ preempt_disable_rt();
-+ if (!msg_insert(sender->msg, info)) {
-+ list_del(&sender->list);
-+ sender->state = STATE_PENDING;
-+ wake_up_process(sender->task);
-+ smp_wmb();
-+ sender->state = STATE_READY;
-+ }
-+ preempt_enable_rt();
- }
-
- SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr,
-Index: linux-stable/ipc/msg.c
-===================================================================
---- linux-stable.orig/ipc/msg.c
-+++ linux-stable/ipc/msg.c
-@@ -253,6 +253,12 @@ static void expunge_all(struct msg_queue
- struct msg_receiver *msr, *t;
-
- list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
-+ /*
-+ * Make sure that the wakeup doesnt preempt
-+ * this CPU prematurely. (on PREEMPT_RT)
-+ */
-+ preempt_disable_rt();
-+
- msr->r_msg = NULL; /* initialize expunge ordering */
- wake_up_process(msr->r_tsk);
- /*
-@@ -263,6 +269,8 @@ static void expunge_all(struct msg_queue
- */
- smp_mb();
- msr->r_msg = ERR_PTR(res);
-+
-+ preempt_enable_rt();
- }
- }
-
-@@ -641,6 +649,11 @@ static inline int pipelined_send(struct
- if (testmsg(msg, msr->r_msgtype, msr->r_mode) &&
- !security_msg_queue_msgrcv(msq, msg, msr->r_tsk,
- msr->r_msgtype, msr->r_mode)) {
-+ /*
-+ * Make sure that the wakeup doesnt preempt
-+ * this CPU prematurely. (on PREEMPT_RT)
-+ */
-+ preempt_disable_rt();
-
- list_del(&msr->r_list);
- if (msr->r_maxsize < msg->m_ts) {
-@@ -662,12 +675,13 @@ static inline int pipelined_send(struct
- */
- smp_mb();
- msr->r_msg = msg;
-+ preempt_enable_rt();
-
- return 1;
- }
-+ preempt_enable_rt();
- }
- }
--
- return 0;
- }
-
-Index: linux-stable/kernel/relay.c
-===================================================================
---- linux-stable.orig/kernel/relay.c
-+++ linux-stable/kernel/relay.c
-@@ -339,6 +339,10 @@ static void wakeup_readers(unsigned long
- {
- struct rchan_buf *buf = (struct rchan_buf *)data;
- wake_up_interruptible(&buf->read_wait);
-+ /*
-+ * Stupid polling for now:
-+ */
-+ mod_timer(&buf->timer, jiffies + 1);
- }
-
- /**
-@@ -356,6 +360,7 @@ static void __relay_reset(struct rchan_b
- init_waitqueue_head(&buf->read_wait);
- kref_init(&buf->kref);
- setup_timer(&buf->timer, wakeup_readers, (unsigned long)buf);
-+ mod_timer(&buf->timer, jiffies + 1);
- } else
- del_timer_sync(&buf->timer);
-
-@@ -739,15 +744,6 @@ size_t relay_switch_subbuf(struct rchan_
- else
- buf->early_bytes += buf->chan->subbuf_size -
- buf->padding[old_subbuf];
-- smp_mb();
-- if (waitqueue_active(&buf->read_wait))
-- /*
-- * Calling wake_up_interruptible() from here
-- * will deadlock if we happen to be logging
-- * from the scheduler (trying to re-grab
-- * rq->lock), so defer it.
-- */
-- mod_timer(&buf->timer, jiffies + 1);
- }
-
- old = buf->data;
-Index: linux-stable/include/linux/timer.h
-===================================================================
---- linux-stable.orig/include/linux/timer.h
-+++ linux-stable/include/linux/timer.h
-@@ -241,7 +241,7 @@ extern void add_timer(struct timer_list
-
- extern int try_to_del_timer_sync(struct timer_list *timer);
-
--#ifdef CONFIG_SMP
-+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
- extern int del_timer_sync(struct timer_list *timer);
- #else
- # define del_timer_sync(t) del_timer(t)
-Index: linux-stable/kernel/timer.c
-===================================================================
---- linux-stable.orig/kernel/timer.c
-+++ linux-stable/kernel/timer.c
-@@ -78,6 +78,9 @@ struct tvec_root {
- struct tvec_base {
- spinlock_t lock;
- struct timer_list *running_timer;
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ wait_queue_head_t wait_for_running_timer;
-+#endif
- unsigned long timer_jiffies;
- unsigned long next_timer;
- unsigned long active_timers;
-@@ -720,6 +723,36 @@ static struct tvec_base *lock_timer_base
- }
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+static inline struct tvec_base *switch_timer_base(struct timer_list *timer,
-+ struct tvec_base *old,
-+ struct tvec_base *new)
-+{
-+ /* See the comment in lock_timer_base() */
-+ timer_set_base(timer, NULL);
-+ spin_unlock(&old->lock);
-+ spin_lock(&new->lock);
-+ timer_set_base(timer, new);
-+ return new;
-+}
-+#else
-+static inline struct tvec_base *switch_timer_base(struct timer_list *timer,
-+ struct tvec_base *old,
-+ struct tvec_base *new)
-+{
-+ /*
-+ * We cannot do the above because we might be preempted and
-+ * then the preempter would see NULL and loop forever.
-+ */
-+ if (spin_trylock(&new->lock)) {
-+ timer_set_base(timer, new);
-+ spin_unlock(&old->lock);
-+ return new;
-+ }
-+ return old;
-+}
-+#endif
-+
- static inline int
- __mod_timer(struct timer_list *timer, unsigned long expires,
- bool pending_only, int pinned)
-@@ -739,12 +772,15 @@ __mod_timer(struct timer_list *timer, un
-
- debug_activate(timer, expires);
-
-+ preempt_disable_rt();
- cpu = smp_processor_id();
-
- #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
- if (!pinned && get_sysctl_timer_migration() && idle_cpu(cpu))
- cpu = get_nohz_timer_target();
- #endif
-+ preempt_enable_rt();
-+
- new_base = per_cpu(tvec_bases, cpu);
-
- if (base != new_base) {
-@@ -755,14 +791,8 @@ __mod_timer(struct timer_list *timer, un
- * handler yet has not finished. This also guarantees that
- * the timer is serialized wrt itself.
- */
-- if (likely(base->running_timer != timer)) {
-- /* See the comment in lock_timer_base() */
-- timer_set_base(timer, NULL);
-- spin_unlock(&base->lock);
-- base = new_base;
-- spin_lock(&base->lock);
-- timer_set_base(timer, base);
-- }
-+ if (likely(base->running_timer != timer))
-+ base = switch_timer_base(timer, base, new_base);
- }
-
- timer->expires = expires;
-@@ -945,6 +975,29 @@ void add_timer_on(struct timer_list *tim
- }
- EXPORT_SYMBOL_GPL(add_timer_on);
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+/*
-+ * Wait for a running timer
-+ */
-+static void wait_for_running_timer(struct timer_list *timer)
-+{
-+ struct tvec_base *base = timer->base;
-+
-+ if (base->running_timer == timer)
-+ wait_event(base->wait_for_running_timer,
-+ base->running_timer != timer);
-+}
-+
-+# define wakeup_timer_waiters(b) wake_up(&(b)->wait_for_running_timer)
-+#else
-+static inline void wait_for_running_timer(struct timer_list *timer)
-+{
-+ cpu_relax();
-+}
-+
-+# define wakeup_timer_waiters(b) do { } while (0)
-+#endif
-+
- /**
- * del_timer - deactive a timer.
- * @timer: the timer to be deactivated
-@@ -1002,7 +1055,7 @@ int try_to_del_timer_sync(struct timer_l
- }
- EXPORT_SYMBOL(try_to_del_timer_sync);
-
--#ifdef CONFIG_SMP
-+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
- /**
- * del_timer_sync - deactivate a timer and wait for the handler to finish.
- * @timer: the timer to be deactivated
-@@ -1062,7 +1115,7 @@ int del_timer_sync(struct timer_list *ti
- int ret = try_to_del_timer_sync(timer);
- if (ret >= 0)
- return ret;
-- cpu_relax();
-+ wait_for_running_timer(timer);
- }
- }
- EXPORT_SYMBOL(del_timer_sync);
-@@ -1179,15 +1232,17 @@ static inline void __run_timers(struct t
- if (irqsafe) {
- spin_unlock(&base->lock);
- call_timer_fn(timer, fn, data);
-+ base->running_timer = NULL;
- spin_lock(&base->lock);
- } else {
- spin_unlock_irq(&base->lock);
- call_timer_fn(timer, fn, data);
-+ base->running_timer = NULL;
- spin_lock_irq(&base->lock);
- }
- }
- }
-- base->running_timer = NULL;
-+ wakeup_timer_waiters(base);
- spin_unlock_irq(&base->lock);
- }
-
-@@ -1327,17 +1382,31 @@ unsigned long get_next_timer_interrupt(u
- if (cpu_is_offline(smp_processor_id()))
- return expires;
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ /*
-+ * On PREEMPT_RT we cannot sleep here. If the trylock does not
-+ * succeed then we return the worst-case 'expires in 1 tick'
-+ * value. We use the rt functions here directly to avoid a
-+ * migrate_disable() call.
-+ */
-+ if (!spin_do_trylock(&base->lock))
-+ return now + 1;
-+#else
- spin_lock(&base->lock);
-+#endif
- if (base->active_timers) {
- if (time_before_eq(base->next_timer, base->timer_jiffies))
- base->next_timer = __next_timer_interrupt(base);
- expires = base->next_timer;
- }
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ rt_spin_unlock_after_trylock_in_irq(&base->lock);
-+#else
- spin_unlock(&base->lock);
-+#endif
-
- if (time_before_eq(expires, now))
- return now;
--
- return cmp_next_hrtimer_event(now, expires);
- }
- #endif
-@@ -1353,13 +1422,13 @@ void update_process_times(int user_tick)
-
- /* Note: this timer irq context must be accounted for as well. */
- account_process_tick(p, user_tick);
-+ scheduler_tick();
- run_local_timers();
- rcu_check_callbacks(cpu, user_tick);
--#ifdef CONFIG_IRQ_WORK
-+#if defined(CONFIG_IRQ_WORK)
- if (in_irq())
- irq_work_run();
- #endif
-- scheduler_tick();
- run_posix_cpu_timers(p);
- }
-
-@@ -1370,7 +1439,9 @@ static void run_timer_softirq(struct sof
- {
- struct tvec_base *base = __this_cpu_read(tvec_bases);
-
-- hrtimer_run_pending();
-+#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_PREEMPT_RT_FULL)
-+ irq_work_run();
-+#endif
-
- if (time_after_eq(jiffies, base->timer_jiffies))
- __run_timers(base);
-@@ -1381,8 +1452,52 @@ static void run_timer_softirq(struct sof
- */
- void run_local_timers(void)
- {
-+ struct tvec_base *base = __this_cpu_read(tvec_bases);
-+
- hrtimer_run_queues();
-+ /*
-+ * We can access this lockless as we are in the timer
-+ * interrupt. If there are no timers queued, nothing to do in
-+ * the timer softirq.
-+ */
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+
-+#ifndef CONFIG_SMP
-+ /*
-+ * The spin_do_trylock() later may fail as the lock may be hold before
-+ * the interrupt arrived. The spin-lock debugging code will raise a
-+ * warning if the try_lock fails on UP. Since this is only an
-+ * optimization for the FULL_NO_HZ case (not to run the timer softirq on
-+ * an nohz_full CPU) we don't really care and shedule the softirq.
-+ */
- raise_softirq(TIMER_SOFTIRQ);
-+ return;
-+#endif
-+
-+ /* On RT, irq work runs from softirq */
-+ if (irq_work_needs_cpu()) {
-+ raise_softirq(TIMER_SOFTIRQ);
-+ return;
-+ }
-+
-+ if (!spin_do_trylock(&base->lock)) {
-+ raise_softirq(TIMER_SOFTIRQ);
-+ return;
-+ }
-+#endif
-+
-+ if (!base->active_timers)
-+ goto out;
-+
-+ /* Check whether the next pending timer has expired */
-+ if (time_before_eq(base->next_timer, jiffies))
-+ raise_softirq(TIMER_SOFTIRQ);
-+out:
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ rt_spin_unlock_after_trylock_in_irq(&base->lock);
-+#endif
-+ /* The ; ensures that gcc won't complain in the !RT case */
-+ ;
- }
-
- #ifdef __ARCH_WANT_SYS_ALARM
-@@ -1546,6 +1661,9 @@ static int init_timers_cpu(int cpu)
- base = per_cpu(tvec_bases, cpu);
- }
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ init_waitqueue_head(&base->wait_for_running_timer);
-+#endif
-
- for (j = 0; j < TVN_SIZE; j++) {
- INIT_LIST_HEAD(base->tv5.vec + j);
-@@ -1584,7 +1702,7 @@ static void migrate_timers(int cpu)
-
- BUG_ON(cpu_online(cpu));
- old_base = per_cpu(tvec_bases, cpu);
-- new_base = get_cpu_var(tvec_bases);
-+ new_base = get_local_var(tvec_bases);
- /*
- * The caller is globally serialized and nobody else
- * takes two locks at once, deadlock is not possible.
-@@ -1605,7 +1723,7 @@ static void migrate_timers(int cpu)
-
- spin_unlock(&old_base->lock);
- spin_unlock_irq(&new_base->lock);
-- put_cpu_var(tvec_bases);
-+ put_local_var(tvec_bases);
- }
- #endif /* CONFIG_HOTPLUG_CPU */
-
-Index: linux-stable/kernel/itimer.c
-===================================================================
---- linux-stable.orig/kernel/itimer.c
-+++ linux-stable/kernel/itimer.c
-@@ -213,6 +213,7 @@ again:
- /* We are sharing ->siglock with it_real_fn() */
- if (hrtimer_try_to_cancel(timer) < 0) {
- spin_unlock_irq(&tsk->sighand->siglock);
-+ hrtimer_wait_for_timer(&tsk->signal->real_timer);
- goto again;
- }
- expires = timeval_to_ktime(value->it_value);
-Index: linux-stable/kernel/sched/rt.c
-===================================================================
---- linux-stable.orig/kernel/sched/rt.c
-+++ linux-stable/kernel/sched/rt.c
-@@ -43,6 +43,7 @@ void init_rt_bandwidth(struct rt_bandwid
-
- hrtimer_init(&rt_b->rt_period_timer,
- CLOCK_MONOTONIC, HRTIMER_MODE_REL);
-+ rt_b->rt_period_timer.irqsafe = 1;
- rt_b->rt_period_timer.function = sched_rt_period_timer;
- }
-
-Index: linux-stable/fs/timerfd.c
-===================================================================
---- linux-stable.orig/fs/timerfd.c
-+++ linux-stable/fs/timerfd.c
-@@ -380,7 +380,10 @@ static int do_timerfd_settime(int ufd, i
- break;
- }
- spin_unlock_irq(&ctx->wqh.lock);
-- cpu_relax();
-+ if (isalarm(ctx))
-+ hrtimer_wait_for_timer(&ctx->t.alarm.timer);
-+ else
-+ hrtimer_wait_for_timer(&ctx->t.tmr);
- }
-
- /*
-Index: linux-stable/init/main.c
-===================================================================
---- linux-stable.orig/init/main.c
-+++ linux-stable/init/main.c
-@@ -6,7 +6,7 @@
- * GK 2/5/95 - Changed to support mounting root fs via NFS
- * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
- * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
-- * Simplified starting of init: Michael A. Griffith <grif@acm.org>
-+ * Simplified starting of init: Michael A. Griffith <grif@acm.org>
- */
-
- #define DEBUG /* Enable initcall_debug */
-@@ -74,6 +74,7 @@
- #include <linux/ptrace.h>
- #include <linux/blkdev.h>
- #include <linux/elevator.h>
-+#include <linux/posix-timers.h>
- #include <linux/sched_clock.h>
- #include <linux/context_tracking.h>
- #include <linux/random.h>
-@@ -512,6 +513,7 @@ asmlinkage void __init start_kernel(void
- setup_command_line(command_line);
- setup_nr_cpu_ids();
- setup_per_cpu_areas();
-+ softirq_early_init();
- smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
-
- build_all_zonelists(NULL, NULL);
-Index: linux-stable/kernel/posix-cpu-timers.c
-===================================================================
---- linux-stable.orig/kernel/posix-cpu-timers.c
-+++ linux-stable/kernel/posix-cpu-timers.c
-@@ -3,6 +3,7 @@
- */
-
- #include <linux/sched.h>
-+#include <linux/sched/rt.h>
- #include <linux/posix-timers.h>
- #include <linux/errno.h>
- #include <linux/math64.h>
-@@ -640,7 +641,7 @@ static int posix_cpu_timer_set(struct k_
- /*
- * Disarm any old timer after extracting its expiry time.
- */
-- WARN_ON_ONCE(!irqs_disabled());
-+ WARN_ON_ONCE_NONRT(!irqs_disabled());
-
- ret = 0;
- old_incr = timer->it.cpu.incr;
-@@ -1061,7 +1062,7 @@ void posix_cpu_timer_schedule(struct k_i
- /*
- * Now re-arm for the new expiry time.
- */
-- WARN_ON_ONCE(!irqs_disabled());
-+ WARN_ON_ONCE_NONRT(!irqs_disabled());
- arm_timer(timer);
- unlock_task_sighand(p, &flags);
-
-@@ -1127,10 +1128,11 @@ static inline int fastpath_timer_check(s
- sig = tsk->signal;
- if (sig->cputimer.running) {
- struct task_cputime group_sample;
-+ unsigned long flags;
-
-- raw_spin_lock(&sig->cputimer.lock);
-+ raw_spin_lock_irqsave(&sig->cputimer.lock, flags);
- group_sample = sig->cputimer.cputime;
-- raw_spin_unlock(&sig->cputimer.lock);
-+ raw_spin_unlock_irqrestore(&sig->cputimer.lock, flags);
-
- if (task_cputime_expired(&group_sample, &sig->cputime_expires))
- return 1;
-@@ -1144,13 +1146,13 @@ static inline int fastpath_timer_check(s
- * already updated our counts. We need to check if any timers fire now.
- * Interrupts are disabled.
- */
--void run_posix_cpu_timers(struct task_struct *tsk)
-+static void __run_posix_cpu_timers(struct task_struct *tsk)
- {
- LIST_HEAD(firing);
- struct k_itimer *timer, *next;
- unsigned long flags;
-
-- WARN_ON_ONCE(!irqs_disabled());
-+ WARN_ON_ONCE_NONRT(!irqs_disabled());
-
- /*
- * The fast path checks that there are no expired thread or thread
-@@ -1208,6 +1210,190 @@ void run_posix_cpu_timers(struct task_st
- }
- }
-
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+#include <linux/kthread.h>
-+#include <linux/cpu.h>
-+DEFINE_PER_CPU(struct task_struct *, posix_timer_task);
-+DEFINE_PER_CPU(struct task_struct *, posix_timer_tasklist);
-+
-+static int posix_cpu_timers_thread(void *data)
-+{
-+ int cpu = (long)data;
-+
-+ BUG_ON(per_cpu(posix_timer_task,cpu) != current);
-+
-+ while (!kthread_should_stop()) {
-+ struct task_struct *tsk = NULL;
-+ struct task_struct *next = NULL;
-+
-+ if (cpu_is_offline(cpu))
-+ goto wait_to_die;
-+
-+ /* grab task list */
-+ raw_local_irq_disable();
-+ tsk = per_cpu(posix_timer_tasklist, cpu);
-+ per_cpu(posix_timer_tasklist, cpu) = NULL;
-+ raw_local_irq_enable();
-+
-+ /* its possible the list is empty, just return */
-+ if (!tsk) {
-+ set_current_state(TASK_INTERRUPTIBLE);
-+ schedule();
-+ __set_current_state(TASK_RUNNING);
-+ continue;
-+ }
-+
-+ /* Process task list */
-+ while (1) {
-+ /* save next */
-+ next = tsk->posix_timer_list;
-+
-+ /* run the task timers, clear its ptr and
-+ * unreference it
-+ */
-+ __run_posix_cpu_timers(tsk);
-+ tsk->posix_timer_list = NULL;
-+ put_task_struct(tsk);
-+
-+ /* check if this is the last on the list */
-+ if (next == tsk)
-+ break;
-+ tsk = next;
-+ }
-+ }
-+ return 0;
-+
-+wait_to_die:
-+ /* Wait for kthread_stop */
-+ set_current_state(TASK_INTERRUPTIBLE);
-+ while (!kthread_should_stop()) {
-+ schedule();
-+ set_current_state(TASK_INTERRUPTIBLE);
-+ }
-+ __set_current_state(TASK_RUNNING);
-+ return 0;
-+}
-+
-+static inline int __fastpath_timer_check(struct task_struct *tsk)
-+{
-+ /* tsk == current, ensure it is safe to use ->signal/sighand */
-+ if (unlikely(tsk->exit_state))
-+ return 0;
-+
-+ if (!task_cputime_zero(&tsk->cputime_expires))
-+ return 1;
-+
-+ if (!task_cputime_zero(&tsk->signal->cputime_expires))
-+ return 1;
-+
-+ return 0;
-+}
-+
-+void run_posix_cpu_timers(struct task_struct *tsk)
-+{
-+ unsigned long cpu = smp_processor_id();
-+ struct task_struct *tasklist;
-+
-+ BUG_ON(!irqs_disabled());
-+ if(!per_cpu(posix_timer_task, cpu))
-+ return;
-+ /* get per-cpu references */
-+ tasklist = per_cpu(posix_timer_tasklist, cpu);
-+
-+ /* check to see if we're already queued */
-+ if (!tsk->posix_timer_list && __fastpath_timer_check(tsk)) {
-+ get_task_struct(tsk);
-+ if (tasklist) {
-+ tsk->posix_timer_list = tasklist;
-+ } else {
-+ /*
-+ * The list is terminated by a self-pointing
-+ * task_struct
-+ */
-+ tsk->posix_timer_list = tsk;
-+ }
-+ per_cpu(posix_timer_tasklist, cpu) = tsk;
-+
-+ wake_up_process(per_cpu(posix_timer_task, cpu));
-+ }
-+}
-+
-+/*
-+ * posix_cpu_thread_call - callback that gets triggered when a CPU is added.
-+ * Here we can start up the necessary migration thread for the new CPU.
-+ */
-+static int posix_cpu_thread_call(struct notifier_block *nfb,
-+ unsigned long action, void *hcpu)
-+{
-+ int cpu = (long)hcpu;
-+ struct task_struct *p;
-+ struct sched_param param;
-+
-+ switch (action) {
-+ case CPU_UP_PREPARE:
-+ p = kthread_create(posix_cpu_timers_thread, hcpu,
-+ "posixcputmr/%d",cpu);
-+ if (IS_ERR(p))
-+ return NOTIFY_BAD;
-+ p->flags |= PF_NOFREEZE;
-+ kthread_bind(p, cpu);
-+ /* Must be high prio to avoid getting starved */
-+ param.sched_priority = MAX_RT_PRIO-1;
-+ sched_setscheduler(p, SCHED_FIFO, &param);
-+ per_cpu(posix_timer_task,cpu) = p;
-+ break;
-+ case CPU_ONLINE:
-+ /* Strictly unneccessary, as first user will wake it. */
-+ wake_up_process(per_cpu(posix_timer_task,cpu));
-+ break;
-+#ifdef CONFIG_HOTPLUG_CPU
-+ case CPU_UP_CANCELED:
-+ /* Unbind it from offline cpu so it can run. Fall thru. */
-+ kthread_bind(per_cpu(posix_timer_task, cpu),
-+ cpumask_any(cpu_online_mask));
-+ kthread_stop(per_cpu(posix_timer_task,cpu));
-+ per_cpu(posix_timer_task,cpu) = NULL;
-+ break;
-+ case CPU_DEAD:
-+ kthread_stop(per_cpu(posix_timer_task,cpu));
-+ per_cpu(posix_timer_task,cpu) = NULL;
-+ break;
-+#endif
-+ }
-+ return NOTIFY_OK;
-+}
-+
-+/* Register at highest priority so that task migration (migrate_all_tasks)
-+ * happens before everything else.
-+ */
-+static struct notifier_block posix_cpu_thread_notifier = {
-+ .notifier_call = posix_cpu_thread_call,
-+ .priority = 10
-+};
-+
-+static int __init posix_cpu_thread_init(void)
-+{
-+ void *hcpu = (void *)(long)smp_processor_id();
-+ /* Start one for boot CPU. */
-+ unsigned long cpu;
-+
-+ /* init the per-cpu posix_timer_tasklets */
-+ for_each_possible_cpu(cpu)
-+ per_cpu(posix_timer_tasklist, cpu) = NULL;
-+
-+ posix_cpu_thread_call(&posix_cpu_thread_notifier, CPU_UP_PREPARE, hcpu);
-+ posix_cpu_thread_call(&posix_cpu_thread_notifier, CPU_ONLINE, hcpu);
-+ register_cpu_notifier(&posix_cpu_thread_notifier);
-+ return 0;
-+}
-+early_initcall(posix_cpu_thread_init);
-+#else /* CONFIG_PREEMPT_RT_BASE */
-+void run_posix_cpu_timers(struct task_struct *tsk)
-+{
-+ __run_posix_cpu_timers(tsk);
-+}
-+#endif /* CONFIG_PREEMPT_RT_BASE */
-+
- /*
- * Set one of the process-wide special case CPU timers or RLIMIT_CPU.
- * The tsk->sighand->siglock must be held by the caller.
-Index: linux-stable/include/linux/mm_types.h
-===================================================================
---- linux-stable.orig/include/linux/mm_types.h
-+++ linux-stable/include/linux/mm_types.h
-@@ -11,6 +11,7 @@
- #include <linux/completion.h>
- #include <linux/cpumask.h>
- #include <linux/page-debug-flags.h>
-+#include <linux/rcupdate.h>
- #include <linux/uprobes.h>
- #include <linux/page-flags-layout.h>
- #include <asm/page.h>
-@@ -453,6 +454,9 @@ struct mm_struct {
- bool tlb_flush_pending;
- #endif
- struct uprobes_state uprobes_state;
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ struct rcu_head delayed_drop;
-+#endif
- };
-
- static inline void mm_init_cpumask(struct mm_struct *mm)
-Index: linux-stable/kernel/sched/sched.h
-===================================================================
---- linux-stable.orig/kernel/sched/sched.h
-+++ linux-stable/kernel/sched/sched.h
-@@ -1047,6 +1047,7 @@ static inline void finish_lock_switch(st
- #define WF_SYNC 0x01 /* waker goes to sleep after wakeup */
- #define WF_FORK 0x02 /* child wakeup after fork */
- #define WF_MIGRATED 0x4 /* internal use, task got migrated */
-+#define WF_LOCK_SLEEPER 0x08 /* wakeup spinlock "sleeper" */
-
- /*
- * To aid in avoiding the subversion of "niceness" due to uneven distribution
-@@ -1200,6 +1201,15 @@ extern void init_sched_dl_class(void);
- extern void resched_task(struct task_struct *p);
- extern void resched_cpu(int cpu);
-
-+#ifdef CONFIG_PREEMPT_LAZY
-+extern void resched_task_lazy(struct task_struct *tsk);
-+#else
-+static inline void resched_task_lazy(struct task_struct *tsk)
-+{
-+ resched_task(tsk);
-+}
-+#endif
-+
- extern struct rt_bandwidth def_rt_bandwidth;
- extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime);
-
-Index: linux-stable/include/linux/rcupdate.h
-===================================================================
---- linux-stable.orig/include/linux/rcupdate.h
-+++ linux-stable/include/linux/rcupdate.h
-@@ -128,6 +128,9 @@ void call_rcu(struct rcu_head *head,
-
- #endif /* #else #ifdef CONFIG_PREEMPT_RCU */
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+#define call_rcu_bh call_rcu
-+#else
- /**
- * call_rcu_bh() - Queue an RCU for invocation after a quicker grace period.
- * @head: structure to be used for queueing the RCU updates.
-@@ -151,6 +154,7 @@ void call_rcu(struct rcu_head *head,
- */
- void call_rcu_bh(struct rcu_head *head,
- void (*func)(struct rcu_head *head));
-+#endif
-
- /**
- * call_rcu_sched() - Queue an RCU for invocation after sched grace period.
-@@ -190,6 +194,11 @@ void synchronize_rcu(void);
- * types of kernel builds, the rcu_read_lock() nesting depth is unknowable.
- */
- #define rcu_preempt_depth() (current->rcu_read_lock_nesting)
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+#define sched_rcu_preempt_depth() rcu_preempt_depth()
-+#else
-+static inline int sched_rcu_preempt_depth(void) { return 0; }
-+#endif
-
- #else /* #ifdef CONFIG_PREEMPT_RCU */
-
-@@ -213,6 +222,8 @@ static inline int rcu_preempt_depth(void
- return 0;
- }
-
-+#define sched_rcu_preempt_depth() rcu_preempt_depth()
-+
- #endif /* #else #ifdef CONFIG_PREEMPT_RCU */
-
- /* Internal to kernel */
-@@ -363,7 +374,14 @@ static inline int rcu_read_lock_held(voi
- * rcu_read_lock_bh_held() is defined out of line to avoid #include-file
- * hell.
- */
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+static inline int rcu_read_lock_bh_held(void)
-+{
-+ return rcu_read_lock_held();
-+}
-+#else
- int rcu_read_lock_bh_held(void);
-+#endif
-
- /**
- * rcu_read_lock_sched_held() - might we be in RCU-sched read-side critical section?
-@@ -856,10 +874,14 @@ static inline void rcu_read_unlock(void)
- static inline void rcu_read_lock_bh(void)
- {
- local_bh_disable();
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ rcu_read_lock();
-+#else
- __acquire(RCU_BH);
- rcu_lock_acquire(&rcu_bh_lock_map);
- rcu_lockdep_assert(rcu_is_watching(),
- "rcu_read_lock_bh() used illegally while idle");
-+#endif
- }
-
- /*
-@@ -869,10 +891,14 @@ static inline void rcu_read_lock_bh(void
- */
- static inline void rcu_read_unlock_bh(void)
- {
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ rcu_read_unlock();
-+#else
- rcu_lockdep_assert(rcu_is_watching(),
- "rcu_read_unlock_bh() used illegally while idle");
- rcu_lock_release(&rcu_bh_lock_map);
- __release(RCU_BH);
-+#endif
- local_bh_enable();
- }
-
-Index: linux-stable/kernel/sched/features.h
-===================================================================
---- linux-stable.orig/kernel/sched/features.h
-+++ linux-stable/kernel/sched/features.h
-@@ -50,11 +50,18 @@ SCHED_FEAT(LB_BIAS, true)
- */
- SCHED_FEAT(NONTASK_POWER, true)
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * Queue remote wakeups on the target CPU and process them
- * using the scheduler IPI. Reduces rq->lock contention/bounces.
- */
- SCHED_FEAT(TTWU_QUEUE, true)
-+#else
-+SCHED_FEAT(TTWU_QUEUE, false)
-+# ifdef CONFIG_PREEMPT_LAZY
-+SCHED_FEAT(PREEMPT_LAZY, true)
-+# endif
-+#endif
-
- SCHED_FEAT(FORCE_SD_OVERLAP, false)
- SCHED_FEAT(RT_RUNTIME_SHARE, true)
-Index: linux-stable/kernel/stop_machine.c
-===================================================================
---- linux-stable.orig/kernel/stop_machine.c
-+++ linux-stable/kernel/stop_machine.c
-@@ -30,12 +30,12 @@ struct cpu_stop_done {
- atomic_t nr_todo; /* nr left to execute */
- bool executed; /* actually executed? */
- int ret; /* collected return value */
-- struct completion completion; /* fired if nr_todo reaches 0 */
-+ struct task_struct *waiter; /* woken when nr_todo reaches 0 */
- };
-
- /* the actual stopper, one per every possible cpu, enabled on online cpus */
- struct cpu_stopper {
-- spinlock_t lock;
-+ raw_spinlock_t lock;
- bool enabled; /* is this stopper enabled? */
- struct list_head works; /* list of pending works */
- };
-@@ -56,7 +56,7 @@ static void cpu_stop_init_done(struct cp
- {
- memset(done, 0, sizeof(*done));
- atomic_set(&done->nr_todo, nr_todo);
-- init_completion(&done->completion);
-+ done->waiter = current;
- }
-
- /* signal completion unless @done is NULL */
-@@ -65,8 +65,10 @@ static void cpu_stop_signal_done(struct
- if (done) {
- if (executed)
- done->executed = true;
-- if (atomic_dec_and_test(&done->nr_todo))
-- complete(&done->completion);
-+ if (atomic_dec_and_test(&done->nr_todo)) {
-+ wake_up_process(done->waiter);
-+ done->waiter = NULL;
-+ }
- }
- }
-
-@@ -78,7 +80,7 @@ static void cpu_stop_queue_work(unsigned
-
- unsigned long flags;
-
-- spin_lock_irqsave(&stopper->lock, flags);
-+ raw_spin_lock_irqsave(&stopper->lock, flags);
-
- if (stopper->enabled) {
- list_add_tail(&work->list, &stopper->works);
-@@ -86,7 +88,23 @@ static void cpu_stop_queue_work(unsigned
- } else
- cpu_stop_signal_done(work->done, false);
-
-- spin_unlock_irqrestore(&stopper->lock, flags);
-+ raw_spin_unlock_irqrestore(&stopper->lock, flags);
-+}
-+
-+static void wait_for_stop_done(struct cpu_stop_done *done)
-+{
-+ set_current_state(TASK_UNINTERRUPTIBLE);
-+ while (atomic_read(&done->nr_todo)) {
-+ schedule();
-+ set_current_state(TASK_UNINTERRUPTIBLE);
-+ }
-+ /*
-+ * We need to wait until cpu_stop_signal_done() has cleared
-+ * done->waiter.
-+ */
-+ while (done->waiter)
-+ cpu_relax();
-+ set_current_state(TASK_RUNNING);
- }
-
- /**
-@@ -120,7 +138,7 @@ int stop_one_cpu(unsigned int cpu, cpu_s
-
- cpu_stop_init_done(&done, 1);
- cpu_stop_queue_work(cpu, &work);
-- wait_for_completion(&done.completion);
-+ wait_for_stop_done(&done);
- return done.executed ? done.ret : -ENOENT;
- }
-
-@@ -248,7 +266,7 @@ int stop_two_cpus(unsigned int cpu1, uns
- struct irq_cpu_stop_queue_work_info call_args;
- struct multi_stop_data msdata;
-
-- preempt_disable();
-+ preempt_disable_nort();
- msdata = (struct multi_stop_data){
- .fn = fn,
- .data = arg,
-@@ -281,7 +299,7 @@ int stop_two_cpus(unsigned int cpu1, uns
- * This relies on the stopper workqueues to be FIFO.
- */
- if (!cpu_active(cpu1) || !cpu_active(cpu2)) {
-- preempt_enable();
-+ preempt_enable_nort();
- return -ENOENT;
- }
-
-@@ -295,9 +313,9 @@ int stop_two_cpus(unsigned int cpu1, uns
- &irq_cpu_stop_queue_work,
- &call_args, 1);
- lg_local_unlock(&stop_cpus_lock);
-- preempt_enable();
-+ preempt_enable_nort();
-
-- wait_for_completion(&done.completion);
-+ wait_for_stop_done(&done);
-
- return done.executed ? done.ret : -ENOENT;
- }
-@@ -328,7 +346,7 @@ static DEFINE_PER_CPU(struct cpu_stop_wo
-
- static void queue_stop_cpus_work(const struct cpumask *cpumask,
- cpu_stop_fn_t fn, void *arg,
-- struct cpu_stop_done *done)
-+ struct cpu_stop_done *done, bool inactive)
- {
- struct cpu_stop_work *work;
- unsigned int cpu;
-@@ -342,11 +360,13 @@ static void queue_stop_cpus_work(const s
- }
-
- /*
-- * Disable preemption while queueing to avoid getting
-- * preempted by a stopper which might wait for other stoppers
-- * to enter @fn which can lead to deadlock.
-+ * Make sure that all work is queued on all cpus before
-+ * any of the cpus can execute it.
- */
-- lg_global_lock(&stop_cpus_lock);
-+ if (!inactive)
-+ lg_global_lock(&stop_cpus_lock);
-+ else
-+ lg_global_trylock_relax(&stop_cpus_lock);
- for_each_cpu(cpu, cpumask)
- cpu_stop_queue_work(cpu, &per_cpu(stop_cpus_work, cpu));
- lg_global_unlock(&stop_cpus_lock);
-@@ -358,8 +378,8 @@ static int __stop_cpus(const struct cpum
- struct cpu_stop_done done;
-
- cpu_stop_init_done(&done, cpumask_weight(cpumask));
-- queue_stop_cpus_work(cpumask, fn, arg, &done);
-- wait_for_completion(&done.completion);
-+ queue_stop_cpus_work(cpumask, fn, arg, &done, false);
-+ wait_for_stop_done(&done);
- return done.executed ? done.ret : -ENOENT;
- }
-
-@@ -438,9 +458,9 @@ static int cpu_stop_should_run(unsigned
- unsigned long flags;
- int run;
-
-- spin_lock_irqsave(&stopper->lock, flags);
-+ raw_spin_lock_irqsave(&stopper->lock, flags);
- run = !list_empty(&stopper->works);
-- spin_unlock_irqrestore(&stopper->lock, flags);
-+ raw_spin_unlock_irqrestore(&stopper->lock, flags);
- return run;
- }
-
-@@ -452,13 +472,13 @@ static void cpu_stopper_thread(unsigned
-
- repeat:
- work = NULL;
-- spin_lock_irq(&stopper->lock);
-+ raw_spin_lock_irq(&stopper->lock);
- if (!list_empty(&stopper->works)) {
- work = list_first_entry(&stopper->works,
- struct cpu_stop_work, list);
- list_del_init(&work->list);
- }
-- spin_unlock_irq(&stopper->lock);
-+ raw_spin_unlock_irq(&stopper->lock);
-
- if (work) {
- cpu_stop_fn_t fn = work->fn;
-@@ -466,6 +486,16 @@ repeat:
- struct cpu_stop_done *done = work->done;
- char ksym_buf[KSYM_NAME_LEN] __maybe_unused;
-
-+ /*
-+ * Wait until the stopper finished scheduling on all
-+ * cpus
-+ */
-+ lg_global_lock(&stop_cpus_lock);
-+ /*
-+ * Let other cpu threads continue as well
-+ */
-+ lg_global_unlock(&stop_cpus_lock);
-+
- /* cpu stop callbacks are not allowed to sleep */
- preempt_disable();
-
-@@ -480,7 +510,13 @@ repeat:
- kallsyms_lookup((unsigned long)fn, NULL, NULL, NULL,
- ksym_buf), arg);
-
-+ /*
-+ * Make sure that the wakeup and setting done->waiter
-+ * to NULL is atomic.
-+ */
-+ local_irq_disable();
- cpu_stop_signal_done(done, true);
-+ local_irq_enable();
- goto repeat;
- }
- }
-@@ -499,20 +535,20 @@ static void cpu_stop_park(unsigned int c
- unsigned long flags;
-
- /* drain remaining works */
-- spin_lock_irqsave(&stopper->lock, flags);
-+ raw_spin_lock_irqsave(&stopper->lock, flags);
- list_for_each_entry(work, &stopper->works, list)
- cpu_stop_signal_done(work->done, false);
- stopper->enabled = false;
-- spin_unlock_irqrestore(&stopper->lock, flags);
-+ raw_spin_unlock_irqrestore(&stopper->lock, flags);
- }
-
- static void cpu_stop_unpark(unsigned int cpu)
- {
- struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
-
-- spin_lock_irq(&stopper->lock);
-+ raw_spin_lock_irq(&stopper->lock);
- stopper->enabled = true;
-- spin_unlock_irq(&stopper->lock);
-+ raw_spin_unlock_irq(&stopper->lock);
- }
-
- static struct smp_hotplug_thread cpu_stop_threads = {
-@@ -534,10 +570,12 @@ static int __init cpu_stop_init(void)
- for_each_possible_cpu(cpu) {
- struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
-
-- spin_lock_init(&stopper->lock);
-+ raw_spin_lock_init(&stopper->lock);
- INIT_LIST_HEAD(&stopper->works);
- }
-
-+ lg_lock_init(&stop_cpus_lock, "stop_cpus_lock");
-+
- BUG_ON(smpboot_register_percpu_thread(&cpu_stop_threads));
- stop_machine_initialized = true;
- return 0;
-@@ -633,11 +671,11 @@ int stop_machine_from_inactive_cpu(int (
- set_state(&msdata, MULTI_STOP_PREPARE);
- cpu_stop_init_done(&done, num_active_cpus());
- queue_stop_cpus_work(cpu_active_mask, multi_cpu_stop, &msdata,
-- &done);
-+ &done, true);
- ret = multi_cpu_stop(&msdata);
-
- /* Busy wait for completion. */
-- while (!completion_done(&done.completion))
-+ while (atomic_read(&done.nr_todo))
- cpu_relax();
-
- mutex_unlock(&stop_cpus_mutex);
-Index: linux-stable/include/linux/cpu.h
-===================================================================
---- linux-stable.orig/include/linux/cpu.h
-+++ linux-stable/include/linux/cpu.h
-@@ -182,6 +182,8 @@ extern void get_online_cpus(void);
- extern void put_online_cpus(void);
- extern void cpu_hotplug_disable(void);
- extern void cpu_hotplug_enable(void);
-+extern void pin_current_cpu(void);
-+extern void unpin_current_cpu(void);
- #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
- #define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
- #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
-@@ -196,6 +198,8 @@ static inline void cpu_hotplug_done(void
- #define put_online_cpus() do { } while (0)
- #define cpu_hotplug_disable() do { } while (0)
- #define cpu_hotplug_enable() do { } while (0)
-+static inline void pin_current_cpu(void) { }
-+static inline void unpin_current_cpu(void) { }
- #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
- /* These aren't inline functions due to a GCC bug. */
- #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
-Index: linux-stable/kernel/cpu.c
-===================================================================
---- linux-stable.orig/kernel/cpu.c
-+++ linux-stable/kernel/cpu.c
-@@ -63,6 +63,290 @@ static struct {
- .refcount = 0,
- };
-
-+/**
-+ * hotplug_pcp - per cpu hotplug descriptor
-+ * @unplug: set when pin_current_cpu() needs to sync tasks
-+ * @sync_tsk: the task that waits for tasks to finish pinned sections
-+ * @refcount: counter of tasks in pinned sections
-+ * @grab_lock: set when the tasks entering pinned sections should wait
-+ * @synced: notifier for @sync_tsk to tell cpu_down it's finished
-+ * @mutex: the mutex to make tasks wait (used when @grab_lock is true)
-+ * @mutex_init: zero if the mutex hasn't been initialized yet.
-+ *
-+ * Although @unplug and @sync_tsk may point to the same task, the @unplug
-+ * is used as a flag and still exists after @sync_tsk has exited and
-+ * @sync_tsk set to NULL.
-+ */
-+struct hotplug_pcp {
-+ struct task_struct *unplug;
-+ struct task_struct *sync_tsk;
-+ int refcount;
-+ int grab_lock;
-+ struct completion synced;
-+ struct completion unplug_wait;
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ /*
-+ * Note, on PREEMPT_RT, the hotplug lock must save the state of
-+ * the task, otherwise the mutex will cause the task to fail
-+ * to sleep when required. (Because it's called from migrate_disable())
-+ *
-+ * The spinlock_t on PREEMPT_RT is a mutex that saves the task's
-+ * state.
-+ */
-+ spinlock_t lock;
-+#else
-+ struct mutex mutex;
-+#endif
-+ int mutex_init;
-+};
-+
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+# define hotplug_lock(hp) rt_spin_lock(&(hp)->lock)
-+# define hotplug_unlock(hp) rt_spin_unlock(&(hp)->lock)
-+#else
-+# define hotplug_lock(hp) mutex_lock(&(hp)->mutex)
-+# define hotplug_unlock(hp) mutex_unlock(&(hp)->mutex)
-+#endif
-+
-+static DEFINE_PER_CPU(struct hotplug_pcp, hotplug_pcp);
-+
-+/**
-+ * pin_current_cpu - Prevent the current cpu from being unplugged
-+ *
-+ * Lightweight version of get_online_cpus() to prevent cpu from being
-+ * unplugged when code runs in a migration disabled region.
-+ *
-+ * Must be called with preemption disabled (preempt_count = 1)!
-+ */
-+void pin_current_cpu(void)
-+{
-+ struct hotplug_pcp *hp;
-+ int force = 0;
-+
-+retry:
-+ hp = &__get_cpu_var(hotplug_pcp);
-+
-+ if (!hp->unplug || hp->refcount || force || preempt_count() > 1 ||
-+ hp->unplug == current) {
-+ hp->refcount++;
-+ return;
-+ }
-+ if (hp->grab_lock) {
-+ preempt_enable();
-+ hotplug_lock(hp);
-+ hotplug_unlock(hp);
-+ } else {
-+ preempt_enable();
-+ /*
-+ * Try to push this task off of this CPU.
-+ */
-+ if (!migrate_me()) {
-+ preempt_disable();
-+ hp = &__get_cpu_var(hotplug_pcp);
-+ if (!hp->grab_lock) {
-+ /*
-+ * Just let it continue it's already pinned
-+ * or about to sleep.
-+ */
-+ force = 1;
-+ goto retry;
-+ }
-+ preempt_enable();
-+ }
-+ }
-+ preempt_disable();
-+ goto retry;
-+}
-+
-+/**
-+ * unpin_current_cpu - Allow unplug of current cpu
-+ *
-+ * Must be called with preemption or interrupts disabled!
-+ */
-+void unpin_current_cpu(void)
-+{
-+ struct hotplug_pcp *hp = &__get_cpu_var(hotplug_pcp);
-+
-+ WARN_ON(hp->refcount <= 0);
-+
-+ /* This is safe. sync_unplug_thread is pinned to this cpu */
-+ if (!--hp->refcount && hp->unplug && hp->unplug != current)
-+ wake_up_process(hp->unplug);
-+}
-+
-+static void wait_for_pinned_cpus(struct hotplug_pcp *hp)
-+{
-+ set_current_state(TASK_UNINTERRUPTIBLE);
-+ while (hp->refcount) {
-+ schedule_preempt_disabled();
-+ set_current_state(TASK_UNINTERRUPTIBLE);
-+ }
-+}
-+
-+static int sync_unplug_thread(void *data)
-+{
-+ struct hotplug_pcp *hp = data;
-+
-+ wait_for_completion(&hp->unplug_wait);
-+ preempt_disable();
-+ hp->unplug = current;
-+ wait_for_pinned_cpus(hp);
-+
-+ /*
-+ * This thread will synchronize the cpu_down() with threads
-+ * that have pinned the CPU. When the pinned CPU count reaches
-+ * zero, we inform the cpu_down code to continue to the next step.
-+ */
-+ set_current_state(TASK_UNINTERRUPTIBLE);
-+ preempt_enable();
-+ complete(&hp->synced);
-+
-+ /*
-+ * If all succeeds, the next step will need tasks to wait till
-+ * the CPU is offline before continuing. To do this, the grab_lock
-+ * is set and tasks going into pin_current_cpu() will block on the
-+ * mutex. But we still need to wait for those that are already in
-+ * pinned CPU sections. If the cpu_down() failed, the kthread_should_stop()
-+ * will kick this thread out.
-+ */
-+ while (!hp->grab_lock && !kthread_should_stop()) {
-+ schedule();
-+ set_current_state(TASK_UNINTERRUPTIBLE);
-+ }
-+
-+ /* Make sure grab_lock is seen before we see a stale completion */
-+ smp_mb();
-+
-+ /*
-+ * Now just before cpu_down() enters stop machine, we need to make
-+ * sure all tasks that are in pinned CPU sections are out, and new
-+ * tasks will now grab the lock, keeping them from entering pinned
-+ * CPU sections.
-+ */
-+ if (!kthread_should_stop()) {
-+ preempt_disable();
-+ wait_for_pinned_cpus(hp);
-+ preempt_enable();
-+ complete(&hp->synced);
-+ }
-+
-+ set_current_state(TASK_UNINTERRUPTIBLE);
-+ while (!kthread_should_stop()) {
-+ schedule();
-+ set_current_state(TASK_UNINTERRUPTIBLE);
-+ }
-+ set_current_state(TASK_RUNNING);
-+
-+ /*
-+ * Force this thread off this CPU as it's going down and
-+ * we don't want any more work on this CPU.
-+ */
-+ current->flags &= ~PF_NO_SETAFFINITY;
-+ do_set_cpus_allowed(current, cpu_present_mask);
-+ migrate_me();
-+ return 0;
-+}
-+
-+static void __cpu_unplug_sync(struct hotplug_pcp *hp)
-+{
-+ wake_up_process(hp->sync_tsk);
-+ wait_for_completion(&hp->synced);
-+}
-+
-+static void __cpu_unplug_wait(unsigned int cpu)
-+{
-+ struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu);
-+
-+ complete(&hp->unplug_wait);
-+ wait_for_completion(&hp->synced);
-+}
-+
-+/*
-+ * Start the sync_unplug_thread on the target cpu and wait for it to
-+ * complete.
-+ */
-+static int cpu_unplug_begin(unsigned int cpu)
-+{
-+ struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu);
-+ int err;
-+
-+ /* Protected by cpu_hotplug.lock */
-+ if (!hp->mutex_init) {
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ spin_lock_init(&hp->lock);
-+#else
-+ mutex_init(&hp->mutex);
-+#endif
-+ hp->mutex_init = 1;
-+ }
-+
-+ /* Inform the scheduler to migrate tasks off this CPU */
-+ tell_sched_cpu_down_begin(cpu);
-+
-+ init_completion(&hp->synced);
-+ init_completion(&hp->unplug_wait);
-+
-+ hp->sync_tsk = kthread_create(sync_unplug_thread, hp, "sync_unplug/%d", cpu);
-+ if (IS_ERR(hp->sync_tsk)) {
-+ err = PTR_ERR(hp->sync_tsk);
-+ hp->sync_tsk = NULL;
-+ return err;
-+ }
-+ kthread_bind(hp->sync_tsk, cpu);
-+
-+ /*
-+ * Wait for tasks to get out of the pinned sections,
-+ * it's still OK if new tasks enter. Some CPU notifiers will
-+ * wait for tasks that are going to enter these sections and
-+ * we must not have them block.
-+ */
-+ wake_up_process(hp->sync_tsk);
-+ return 0;
-+}
-+
-+static void cpu_unplug_sync(unsigned int cpu)
-+{
-+ struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu);
-+
-+ init_completion(&hp->synced);
-+ /* The completion needs to be initialzied before setting grab_lock */
-+ smp_wmb();
-+
-+ /* Grab the mutex before setting grab_lock */
-+ hotplug_lock(hp);
-+ hp->grab_lock = 1;
-+
-+ /*
-+ * The CPU notifiers have been completed.
-+ * Wait for tasks to get out of pinned CPU sections and have new
-+ * tasks block until the CPU is completely down.
-+ */
-+ __cpu_unplug_sync(hp);
-+
-+ /* All done with the sync thread */
-+ kthread_stop(hp->sync_tsk);
-+ hp->sync_tsk = NULL;
-+}
-+
-+static void cpu_unplug_done(unsigned int cpu)
-+{
-+ struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu);
-+
-+ hp->unplug = NULL;
-+ /* Let all tasks know cpu unplug is finished before cleaning up */
-+ smp_wmb();
-+
-+ if (hp->sync_tsk)
-+ kthread_stop(hp->sync_tsk);
-+
-+ if (hp->grab_lock) {
-+ hotplug_unlock(hp);
-+ /* protected by cpu_hotplug.lock */
-+ hp->grab_lock = 0;
-+ }
-+ tell_sched_cpu_down_done(cpu);
-+}
-+
- void get_online_cpus(void)
- {
- might_sleep();
-@@ -79,15 +363,14 @@ void put_online_cpus(void)
- {
- if (cpu_hotplug.active_writer == current)
- return;
-- mutex_lock(&cpu_hotplug.lock);
-
-+ mutex_lock(&cpu_hotplug.lock);
- if (WARN_ON(!cpu_hotplug.refcount))
- cpu_hotplug.refcount++; /* try to fix things up */
-
- if (!--cpu_hotplug.refcount && unlikely(cpu_hotplug.active_writer))
- wake_up_process(cpu_hotplug.active_writer);
- mutex_unlock(&cpu_hotplug.lock);
--
- }
- EXPORT_SYMBOL_GPL(put_online_cpus);
-
-@@ -282,13 +565,15 @@ static int __ref take_cpu_down(void *_pa
- /* Requires cpu_add_remove_lock to be held */
- static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
- {
-- int err, nr_calls = 0;
-+ int mycpu, err, nr_calls = 0;
- void *hcpu = (void *)(long)cpu;
- unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0;
- struct take_cpu_down_param tcd_param = {
- .mod = mod,
- .hcpu = hcpu,
- };
-+ cpumask_var_t cpumask;
-+ cpumask_var_t cpumask_org;
-
- if (num_online_cpus() == 1)
- return -EBUSY;
-@@ -296,7 +581,34 @@ static int __ref _cpu_down(unsigned int
- if (!cpu_online(cpu))
- return -EINVAL;
-
-+ /* Move the downtaker off the unplug cpu */
-+ if (!alloc_cpumask_var(&cpumask, GFP_KERNEL))
-+ return -ENOMEM;
-+ if (!alloc_cpumask_var(&cpumask_org, GFP_KERNEL)) {
-+ free_cpumask_var(cpumask);
-+ return -ENOMEM;
-+ }
-+
-+ cpumask_copy(cpumask_org, tsk_cpus_allowed(current));
-+ cpumask_andnot(cpumask, cpu_online_mask, cpumask_of(cpu));
-+ set_cpus_allowed_ptr(current, cpumask);
-+ free_cpumask_var(cpumask);
-+ migrate_disable();
-+ mycpu = smp_processor_id();
-+ if (mycpu == cpu) {
-+ printk(KERN_ERR "Yuck! Still on unplug CPU\n!");
-+ migrate_enable();
-+ err = -EBUSY;
-+ goto restore_cpus;
-+ }
-+ migrate_enable();
-+
- cpu_hotplug_begin();
-+ err = cpu_unplug_begin(cpu);
-+ if (err) {
-+ printk("cpu_unplug_begin(%d) failed\n", cpu);
-+ goto out_cancel;
-+ }
-
- err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls);
- if (err) {
-@@ -322,8 +634,12 @@ static int __ref _cpu_down(unsigned int
- #endif
- synchronize_rcu();
-
-+ __cpu_unplug_wait(cpu);
- smpboot_park_threads(cpu);
-
-+ /* Notifiers are done. Don't let any more tasks pin this CPU. */
-+ cpu_unplug_sync(cpu);
-+
- /*
- * So now all preempt/rcu users must observe !cpu_active().
- */
-@@ -356,9 +672,14 @@ static int __ref _cpu_down(unsigned int
- check_for_tasks(cpu);
-
- out_release:
-+ cpu_unplug_done(cpu);
-+out_cancel:
- cpu_hotplug_done();
- if (!err)
- cpu_notify_nofail(CPU_POST_DEAD | mod, hcpu);
-+restore_cpus:
-+ set_cpus_allowed_ptr(current, cpumask_org);
-+ free_cpumask_var(cpumask_org);
- return err;
- }
-
-Index: linux-stable/lib/smp_processor_id.c
-===================================================================
---- linux-stable.orig/lib/smp_processor_id.c
-+++ linux-stable/lib/smp_processor_id.c
-@@ -38,9 +38,9 @@ notrace unsigned int debug_smp_processor
- if (!printk_ratelimit())
- goto out_enable;
-
-- printk(KERN_ERR "BUG: using smp_processor_id() in preemptible [%08x] "
-- "code: %s/%d\n",
-- preempt_count() - 1, current->comm, current->pid);
-+ printk(KERN_ERR "BUG: using smp_processor_id() in preemptible [%08x %08x] "
-+ "code: %s/%d\n", preempt_count() - 1,
-+ __migrate_disabled(current), current->comm, current->pid);
- print_symbol("caller is %s\n", (long)__builtin_return_address(0));
- dump_stack();
-
-Index: linux-stable/include/linux/ftrace_event.h
-===================================================================
---- linux-stable.orig/include/linux/ftrace_event.h
-+++ linux-stable/include/linux/ftrace_event.h
-@@ -57,6 +57,9 @@ struct trace_entry {
- unsigned char flags;
- unsigned char preempt_count;
- int pid;
-+ unsigned short migrate_disable;
-+ unsigned short padding;
-+ unsigned char preempt_lazy_count;
- };
-
- #define FTRACE_MAX_EVENT \
-Index: linux-stable/kernel/trace/trace.c
-===================================================================
---- linux-stable.orig/kernel/trace/trace.c
-+++ linux-stable/kernel/trace/trace.c
-@@ -1540,6 +1540,7 @@ tracing_generic_entry_update(struct trac
- struct task_struct *tsk = current;
-
- entry->preempt_count = pc & 0xff;
-+ entry->preempt_lazy_count = preempt_lazy_count();
- entry->pid = (tsk) ? tsk->pid : 0;
- entry->flags =
- #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
-@@ -1549,8 +1550,11 @@ tracing_generic_entry_update(struct trac
- #endif
- ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) |
- ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) |
-- (tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) |
-+ (tif_need_resched_now() ? TRACE_FLAG_NEED_RESCHED : 0) |
-+ (need_resched_lazy() ? TRACE_FLAG_NEED_RESCHED_LAZY : 0) |
- (test_preempt_need_resched() ? TRACE_FLAG_PREEMPT_RESCHED : 0);
-+
-+ entry->migrate_disable = (tsk) ? __migrate_disabled(tsk) & 0xFF : 0;
- }
- EXPORT_SYMBOL_GPL(tracing_generic_entry_update);
-
-@@ -2456,14 +2460,17 @@ get_total_entries(struct trace_buffer *b
-
- static void print_lat_help_header(struct seq_file *m)
- {
-- seq_puts(m, "# _------=> CPU# \n");
-- seq_puts(m, "# / _-----=> irqs-off \n");
-- seq_puts(m, "# | / _----=> need-resched \n");
-- seq_puts(m, "# || / _---=> hardirq/softirq \n");
-- seq_puts(m, "# ||| / _--=> preempt-depth \n");
-- seq_puts(m, "# |||| / delay \n");
-- seq_puts(m, "# cmd pid ||||| time | caller \n");
-- seq_puts(m, "# \\ / ||||| \\ | / \n");
-+ seq_puts(m, "# _--------=> CPU# \n");
-+ seq_puts(m, "# / _-------=> irqs-off \n");
-+ seq_puts(m, "# | / _------=> need-resched \n");
-+ seq_puts(m, "# || / _-----=> need-resched_lazy \n");
-+ seq_puts(m, "# ||| / _----=> hardirq/softirq \n");
-+ seq_puts(m, "# |||| / _---=> preempt-depth \n");
-+ seq_puts(m, "# ||||| / _--=> preempt-lazy-depth\n");
-+ seq_puts(m, "# |||||| / _-=> migrate-disable \n");
-+ seq_puts(m, "# ||||||| / delay \n");
-+ seq_puts(m, "# cmd pid |||||||| time | caller \n");
-+ seq_puts(m, "# \\ / |||||||| \\ | / \n");
- }
-
- static void print_event_info(struct trace_buffer *buf, struct seq_file *m)
-@@ -2487,13 +2494,16 @@ static void print_func_help_header(struc
- static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m)
- {
- print_event_info(buf, m);
-- seq_puts(m, "# _-----=> irqs-off\n");
-- seq_puts(m, "# / _----=> need-resched\n");
-- seq_puts(m, "# | / _---=> hardirq/softirq\n");
-- seq_puts(m, "# || / _--=> preempt-depth\n");
-- seq_puts(m, "# ||| / delay\n");
-- seq_puts(m, "# TASK-PID CPU# |||| TIMESTAMP FUNCTION\n");
-- seq_puts(m, "# | | | |||| | |\n");
-+ seq_puts(m, "# _-------=> irqs-off \n");
-+ seq_puts(m, "# / _------=> need-resched \n");
-+ seq_puts(m, "# |/ _-----=> need-resched_lazy \n");
-+ seq_puts(m, "# ||/ _----=> hardirq/softirq \n");
-+ seq_puts(m, "# |||/ _---=> preempt-depth \n");
-+ seq_puts(m, "# ||||/ _--=> preempt-lazy-depth\n");
-+ seq_puts(m, "# ||||| / _-=> migrate-disable \n");
-+ seq_puts(m, "# |||||| / delay\n");
-+ seq_puts(m, "# TASK-PID CPU# |||||| TIMESTAMP FUNCTION\n");
-+ seq_puts(m, "# | | | |||||| | |\n");
- }
-
- void
-Index: linux-stable/kernel/trace/trace_events.c
-===================================================================
---- linux-stable.orig/kernel/trace/trace_events.c
-+++ linux-stable/kernel/trace/trace_events.c
-@@ -160,6 +160,8 @@ static int trace_define_common_fields(vo
- __common_field(unsigned char, flags);
- __common_field(unsigned char, preempt_count);
- __common_field(int, pid);
-+ __common_field(unsigned short, migrate_disable);
-+ __common_field(unsigned short, padding);
-
- return ret;
- }
-Index: linux-stable/kernel/trace/trace_output.c
-===================================================================
---- linux-stable.orig/kernel/trace/trace_output.c
-+++ linux-stable/kernel/trace/trace_output.c
-@@ -606,6 +606,7 @@ int trace_print_lat_fmt(struct trace_seq
- {
- char hardsoft_irq;
- char need_resched;
-+ char need_resched_lazy;
- char irqs_off;
- int hardirq;
- int softirq;
-@@ -634,6 +635,8 @@ int trace_print_lat_fmt(struct trace_seq
- need_resched = '.';
- break;
- }
-+ need_resched_lazy =
-+ (entry->flags & TRACE_FLAG_NEED_RESCHED_LAZY) ? 'L' : '.';
-
- hardsoft_irq =
- (hardirq && softirq) ? 'H' :
-@@ -641,8 +644,9 @@ int trace_print_lat_fmt(struct trace_seq
- softirq ? 's' :
- '.';
-
-- if (!trace_seq_printf(s, "%c%c%c",
-- irqs_off, need_resched, hardsoft_irq))
-+ if (!trace_seq_printf(s, "%c%c%c%c",
-+ irqs_off, need_resched, need_resched_lazy,
-+ hardsoft_irq))
- return 0;
-
- if (entry->preempt_count)
-@@ -650,6 +654,16 @@ int trace_print_lat_fmt(struct trace_seq
- else
- ret = trace_seq_putc(s, '.');
-
-+ if (entry->preempt_lazy_count)
-+ ret = trace_seq_printf(s, "%x", entry->preempt_lazy_count);
-+ else
-+ ret = trace_seq_putc(s, '.');
-+
-+ if (entry->migrate_disable)
-+ ret = trace_seq_printf(s, "%x", entry->migrate_disable);
-+ else
-+ ret = trace_seq_putc(s, '.');
-+
- return ret;
- }
-
-Index: linux-stable/kernel/sched/debug.c
-===================================================================
---- linux-stable.orig/kernel/sched/debug.c
-+++ linux-stable/kernel/sched/debug.c
-@@ -260,6 +260,9 @@ void print_rt_rq(struct seq_file *m, int
- P(rt_throttled);
- PN(rt_time);
- PN(rt_runtime);
-+#ifdef CONFIG_SMP
-+ P(rt_nr_migratory);
-+#endif
-
- #undef PN
- #undef P
-@@ -639,6 +642,10 @@ void proc_sched_show_task(struct task_st
- #endif
- P(policy);
- P(prio);
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ P(migrate_disable);
-+#endif
-+ P(nr_cpus_allowed);
- #undef PN
- #undef __PN
- #undef P
-Index: linux-stable/kernel/trace/ring_buffer.c
-===================================================================
---- linux-stable.orig/kernel/trace/ring_buffer.c
-+++ linux-stable/kernel/trace/ring_buffer.c
-@@ -1682,28 +1682,22 @@ int ring_buffer_resize(struct ring_buffe
- * We can't schedule on offline CPUs, but it's not necessary
- * since we can change their buffer sizes without any race.
- */
-+ migrate_disable();
- for_each_buffer_cpu(buffer, cpu) {
- cpu_buffer = buffer->buffers[cpu];
- if (!cpu_buffer->nr_pages_to_update)
- continue;
-
- /* The update must run on the CPU that is being updated. */
-- preempt_disable();
- if (cpu == smp_processor_id() || !cpu_online(cpu)) {
- rb_update_pages(cpu_buffer);
- cpu_buffer->nr_pages_to_update = 0;
- } else {
-- /*
-- * Can not disable preemption for schedule_work_on()
-- * on PREEMPT_RT.
-- */
-- preempt_enable();
- schedule_work_on(cpu,
- &cpu_buffer->update_pages_work);
-- preempt_disable();
- }
-- preempt_enable();
- }
-+ migrate_enable();
-
- /* wait for all the updates to complete */
- for_each_buffer_cpu(buffer, cpu) {
-@@ -1740,22 +1734,16 @@ int ring_buffer_resize(struct ring_buffe
-
- get_online_cpus();
-
-- preempt_disable();
-+ migrate_disable();
- /* The update must run on the CPU that is being updated. */
- if (cpu_id == smp_processor_id() || !cpu_online(cpu_id))
- rb_update_pages(cpu_buffer);
- else {
-- /*
-- * Can not disable preemption for schedule_work_on()
-- * on PREEMPT_RT.
-- */
-- preempt_enable();
- schedule_work_on(cpu_id,
- &cpu_buffer->update_pages_work);
- wait_for_completion(&cpu_buffer->update_done);
-- preempt_disable();
- }
-- preempt_enable();
-+ migrate_enable();
-
- cpu_buffer->nr_pages_to_update = 0;
- put_online_cpus();
-Index: linux-stable/kernel/locking/lockdep.c
-===================================================================
---- linux-stable.orig/kernel/locking/lockdep.c
-+++ linux-stable/kernel/locking/lockdep.c
-@@ -3543,6 +3543,7 @@ static void check_flags(unsigned long fl
- }
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * We dont accurately track softirq state in e.g.
- * hardirq contexts (such as on 4KSTACKS), so only
-@@ -3557,6 +3558,7 @@ static void check_flags(unsigned long fl
- DEBUG_LOCKS_WARN_ON(!current->softirqs_enabled);
- }
- }
-+#endif
-
- if (!debug_locks)
- print_irqtrace_events(current);
-Index: linux-stable/kernel/Kconfig.locks
-===================================================================
---- linux-stable.orig/kernel/Kconfig.locks
-+++ linux-stable/kernel/Kconfig.locks
-@@ -222,4 +222,4 @@ endif
-
- config MUTEX_SPIN_ON_OWNER
- def_bool y
-- depends on SMP && !DEBUG_MUTEXES && ARCH_SUPPORTS_ATOMIC_RMW
-+ depends on SMP && !DEBUG_MUTEXES && ARCH_SUPPORTS_ATOMIC_RMW && !PREEMPT_RT_FULL
-Index: linux-stable/include/linux/bottom_half.h
-===================================================================
---- linux-stable.orig/include/linux/bottom_half.h
-+++ linux-stable/include/linux/bottom_half.h
-@@ -4,6 +4,17 @@
- #include <linux/preempt.h>
- #include <linux/preempt_mask.h>
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+
-+extern void local_bh_disable(void);
-+extern void _local_bh_enable(void);
-+extern void local_bh_enable(void);
-+extern void local_bh_enable_ip(unsigned long ip);
-+extern void __local_bh_disable_ip(unsigned long ip, unsigned int cnt);
-+extern void __local_bh_enable_ip(unsigned long ip, unsigned int cnt);
-+
-+#else
-+
- #ifdef CONFIG_TRACE_IRQFLAGS
- extern void __local_bh_disable_ip(unsigned long ip, unsigned int cnt);
- #else
-@@ -31,5 +42,6 @@ static inline void local_bh_enable(void)
- {
- __local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET);
- }
-+#endif
-
- #endif /* _LINUX_BH_H */
-Index: linux-stable/include/linux/preempt_mask.h
-===================================================================
---- linux-stable.orig/include/linux/preempt_mask.h
-+++ linux-stable/include/linux/preempt_mask.h
-@@ -44,16 +44,26 @@
- #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT)
- #define NMI_OFFSET (1UL << NMI_SHIFT)
-
--#define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET)
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+# define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET)
-+#else
-+# define SOFTIRQ_DISABLE_OFFSET (0)
-+#endif
-
- #define PREEMPT_ACTIVE_BITS 1
- #define PREEMPT_ACTIVE_SHIFT (NMI_SHIFT + NMI_BITS)
- #define PREEMPT_ACTIVE (__IRQ_MASK(PREEMPT_ACTIVE_BITS) << PREEMPT_ACTIVE_SHIFT)
-
- #define hardirq_count() (preempt_count() & HARDIRQ_MASK)
--#define softirq_count() (preempt_count() & SOFTIRQ_MASK)
- #define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK \
- | NMI_MASK))
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+# define softirq_count() (preempt_count() & SOFTIRQ_MASK)
-+# define in_serving_softirq() (softirq_count() & SOFTIRQ_OFFSET)
-+#else
-+# define softirq_count() (0UL)
-+extern int in_serving_softirq(void);
-+#endif
-
- /*
- * Are we doing bottom half or hardware interrupt processing?
-@@ -64,7 +74,6 @@
- #define in_irq() (hardirq_count())
- #define in_softirq() (softirq_count())
- #define in_interrupt() (irq_count())
--#define in_serving_softirq() (softirq_count() & SOFTIRQ_OFFSET)
-
- /*
- * Are we in NMI context?
-Index: linux-stable/arch/powerpc/kernel/irq.c
-===================================================================
---- linux-stable.orig/arch/powerpc/kernel/irq.c
-+++ linux-stable/arch/powerpc/kernel/irq.c
-@@ -605,6 +605,7 @@ void irq_ctx_init(void)
- }
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- void do_softirq_own_stack(void)
- {
- struct thread_info *curtp, *irqtp;
-@@ -622,6 +623,7 @@ void do_softirq_own_stack(void)
- if (irqtp->flags)
- set_bits(irqtp->flags, &curtp->flags);
- }
-+#endif
-
- irq_hw_number_t virq_to_hw(unsigned int virq)
- {
-Index: linux-stable/arch/powerpc/kernel/misc_32.S
-===================================================================
---- linux-stable.orig/arch/powerpc/kernel/misc_32.S
-+++ linux-stable/arch/powerpc/kernel/misc_32.S
-@@ -40,6 +40,7 @@
- * We store the saved ksp_limit in the unused part
- * of the STACK_FRAME_OVERHEAD
- */
-+#ifndef CONFIG_PREEMPT_RT_FULL
- _GLOBAL(call_do_softirq)
- mflr r0
- stw r0,4(r1)
-@@ -56,6 +57,7 @@ _GLOBAL(call_do_softirq)
- stw r10,THREAD+KSP_LIMIT(r2)
- mtlr r0
- blr
-+#endif
-
- /*
- * void call_do_irq(struct pt_regs *regs, struct thread_info *irqtp);
-Index: linux-stable/arch/powerpc/kernel/misc_64.S
-===================================================================
---- linux-stable.orig/arch/powerpc/kernel/misc_64.S
-+++ linux-stable/arch/powerpc/kernel/misc_64.S
-@@ -29,6 +29,7 @@
-
- .text
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- _GLOBAL(call_do_softirq)
- mflr r0
- std r0,16(r1)
-@@ -39,6 +40,7 @@ _GLOBAL(call_do_softirq)
- ld r0,16(r1)
- mtlr r0
- blr
-+#endif
-
- _GLOBAL(call_do_irq)
- mflr r0
-Index: linux-stable/arch/sh/kernel/irq.c
-===================================================================
---- linux-stable.orig/arch/sh/kernel/irq.c
-+++ linux-stable/arch/sh/kernel/irq.c
-@@ -149,6 +149,7 @@ void irq_ctx_exit(int cpu)
- hardirq_ctx[cpu] = NULL;
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- void do_softirq_own_stack(void)
- {
- struct thread_info *curctx;
-@@ -176,6 +177,7 @@ void do_softirq_own_stack(void)
- "r5", "r6", "r7", "r8", "r9", "r15", "t", "pr"
- );
- }
-+#endif
- #else
- static inline void handle_one_irq(unsigned int irq)
- {
-Index: linux-stable/arch/sparc/kernel/irq_64.c
-===================================================================
---- linux-stable.orig/arch/sparc/kernel/irq_64.c
-+++ linux-stable/arch/sparc/kernel/irq_64.c
-@@ -698,6 +698,7 @@ void __irq_entry handler_irq(int pil, st
- set_irq_regs(old_regs);
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- void do_softirq_own_stack(void)
- {
- void *orig_sp, *sp = softirq_stack[smp_processor_id()];
-@@ -712,6 +713,7 @@ void do_softirq_own_stack(void)
- __asm__ __volatile__("mov %0, %%sp"
- : : "r" (orig_sp));
- }
-+#endif
-
- #ifdef CONFIG_HOTPLUG_CPU
- void fixup_irqs(void)
-Index: linux-stable/arch/x86/kernel/entry_64.S
-===================================================================
---- linux-stable.orig/arch/x86/kernel/entry_64.S
-+++ linux-stable/arch/x86/kernel/entry_64.S
-@@ -658,8 +658,8 @@ sysret_check:
- /* Handle reschedules */
- /* edx: work, edi: workmask */
- sysret_careful:
-- bt $TIF_NEED_RESCHED,%edx
-- jnc sysret_signal
-+ testl $_TIF_NEED_RESCHED_MASK,%edx
-+ jz sysret_signal
- TRACE_IRQS_ON
- ENABLE_INTERRUPTS(CLBR_NONE)
- pushq_cfi %rdi
-@@ -771,8 +771,8 @@ GLOBAL(int_with_check)
- /* First do a reschedule test. */
- /* edx: work, edi: workmask */
- int_careful:
-- bt $TIF_NEED_RESCHED,%edx
-- jnc int_very_careful
-+ testl $_TIF_NEED_RESCHED_MASK,%edx
-+ jz int_very_careful
- TRACE_IRQS_ON
- ENABLE_INTERRUPTS(CLBR_NONE)
- pushq_cfi %rdi
-@@ -1071,8 +1071,8 @@ bad_iret:
- /* edi: workmask, edx: work */
- retint_careful:
- CFI_RESTORE_STATE
-- bt $TIF_NEED_RESCHED,%edx
-- jnc retint_signal
-+ testl $_TIF_NEED_RESCHED_MASK,%edx
-+ jz retint_signal
- TRACE_IRQS_ON
- ENABLE_INTERRUPTS(CLBR_NONE)
- pushq_cfi %rdi
-@@ -1104,7 +1104,22 @@ retint_signal:
- /* rcx: threadinfo. interrupts off. */
- ENTRY(retint_kernel)
- cmpl $0,PER_CPU_VAR(__preempt_count)
-+#ifndef CONFIG_PREEMPT_LAZY
- jnz retint_restore_args
-+#else
-+ jz check_int_off
-+
-+ # atleast preempt count == 0 ?
-+ cmpl $_PREEMPT_ENABLED,PER_CPU_VAR(__preempt_count)
-+ jnz retint_restore_args
-+
-+ cmpl $0, TI_preempt_lazy_count(%rcx)
-+ jnz retint_restore_args
-+
-+ bt $TIF_NEED_RESCHED_LAZY,TI_flags(%rcx)
-+ jnc retint_restore_args
-+check_int_off:
-+#endif
- bt $9,EFLAGS-ARGOFFSET(%rsp) /* interrupts off? */
- jnc retint_restore_args
- call preempt_schedule_irq
-@@ -1350,6 +1365,7 @@ bad_gs:
- jmp 2b
- .previous
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- /* Call softirq on interrupt stack. Interrupts are off. */
- ENTRY(do_softirq_own_stack)
- CFI_STARTPROC
-@@ -1369,6 +1385,7 @@ ENTRY(do_softirq_own_stack)
- ret
- CFI_ENDPROC
- END(do_softirq_own_stack)
-+#endif
-
- #ifdef CONFIG_XEN
- zeroentry xen_hypervisor_callback xen_do_hypervisor_callback
-@@ -1538,7 +1555,7 @@ paranoid_userspace:
- movq %rsp,%rdi /* &pt_regs */
- call sync_regs
- movq %rax,%rsp /* switch stack for scheduling */
-- testl $_TIF_NEED_RESCHED,%ebx
-+ testl $_TIF_NEED_RESCHED_MASK,%ebx
- jnz paranoid_schedule
- movl %ebx,%edx /* arg3: thread flags */
- TRACE_IRQS_ON
-Index: linux-stable/arch/x86/kernel/irq_32.c
-===================================================================
---- linux-stable.orig/arch/x86/kernel/irq_32.c
-+++ linux-stable/arch/x86/kernel/irq_32.c
-@@ -145,6 +145,7 @@ void irq_ctx_init(int cpu)
- cpu, per_cpu(hardirq_ctx, cpu), per_cpu(softirq_ctx, cpu));
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- void do_softirq_own_stack(void)
- {
- struct thread_info *curctx;
-@@ -161,6 +162,7 @@ void do_softirq_own_stack(void)
-
- call_on_stack(__do_softirq, isp);
- }
-+#endif
-
- bool handle_irq(unsigned irq, struct pt_regs *regs)
- {
-Index: linux-stable/include/linux/irq.h
-===================================================================
---- linux-stable.orig/include/linux/irq.h
-+++ linux-stable/include/linux/irq.h
-@@ -73,6 +73,7 @@ typedef void (*irq_preflow_handler_t)(st
- * IRQ_IS_POLLED - Always polled by another interrupt. Exclude
- * it from the spurious interrupt detection
- * mechanism and from core side polling.
-+ * IRQ_NO_SOFTIRQ_CALL - No softirq processing in the irq thread context (RT)
- */
- enum {
- IRQ_TYPE_NONE = 0x00000000,
-@@ -98,13 +99,14 @@ enum {
- IRQ_NOTHREAD = (1 << 16),
- IRQ_PER_CPU_DEVID = (1 << 17),
- IRQ_IS_POLLED = (1 << 18),
-+ IRQ_NO_SOFTIRQ_CALL = (1 << 19),
- };
-
- #define IRQF_MODIFY_MASK \
- (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
- IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
- IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID | \
-- IRQ_IS_POLLED)
-+ IRQ_IS_POLLED | IRQ_NO_SOFTIRQ_CALL)
-
- #define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
-
-Index: linux-stable/kernel/irq/settings.h
-===================================================================
---- linux-stable.orig/kernel/irq/settings.h
-+++ linux-stable/kernel/irq/settings.h
-@@ -15,6 +15,7 @@ enum {
- _IRQ_NESTED_THREAD = IRQ_NESTED_THREAD,
- _IRQ_PER_CPU_DEVID = IRQ_PER_CPU_DEVID,
- _IRQ_IS_POLLED = IRQ_IS_POLLED,
-+ _IRQ_NO_SOFTIRQ_CALL = IRQ_NO_SOFTIRQ_CALL,
- _IRQF_MODIFY_MASK = IRQF_MODIFY_MASK,
- };
-
-@@ -28,6 +29,7 @@ enum {
- #define IRQ_NESTED_THREAD GOT_YOU_MORON
- #define IRQ_PER_CPU_DEVID GOT_YOU_MORON
- #define IRQ_IS_POLLED GOT_YOU_MORON
-+#define IRQ_NO_SOFTIRQ_CALL GOT_YOU_MORON
- #undef IRQF_MODIFY_MASK
- #define IRQF_MODIFY_MASK GOT_YOU_MORON
-
-@@ -38,6 +40,16 @@ irq_settings_clr_and_set(struct irq_desc
- desc->status_use_accessors |= (set & _IRQF_MODIFY_MASK);
- }
-
-+static inline bool irq_settings_no_softirq_call(struct irq_desc *desc)
-+{
-+ return desc->status_use_accessors & _IRQ_NO_SOFTIRQ_CALL;
-+}
-+
-+static inline void irq_settings_set_no_softirq_call(struct irq_desc *desc)
-+{
-+ desc->status_use_accessors |= _IRQ_NO_SOFTIRQ_CALL;
-+}
-+
- static inline bool irq_settings_is_per_cpu(struct irq_desc *desc)
- {
- return desc->status_use_accessors & _IRQ_PER_CPU;
-Index: linux-stable/drivers/md/raid5.c
-===================================================================
---- linux-stable.orig/drivers/md/raid5.c
-+++ linux-stable/drivers/md/raid5.c
-@@ -1626,8 +1626,9 @@ static void raid_run_ops(struct stripe_h
- struct raid5_percpu *percpu;
- unsigned long cpu;
-
-- cpu = get_cpu();
-+ cpu = get_cpu_light();
- percpu = per_cpu_ptr(conf->percpu, cpu);
-+ spin_lock(&percpu->lock);
- if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) {
- ops_run_biofill(sh);
- overlap_clear++;
-@@ -1679,7 +1680,8 @@ static void raid_run_ops(struct stripe_h
- if (test_and_clear_bit(R5_Overlap, &dev->flags))
- wake_up(&sh->raid_conf->wait_for_overlap);
- }
-- put_cpu();
-+ spin_unlock(&percpu->lock);
-+ put_cpu_light();
- }
-
- static int grow_one_stripe(struct r5conf *conf, int hash)
-@@ -5619,6 +5621,7 @@ static int raid5_alloc_percpu(struct r5c
- __func__, cpu);
- break;
- }
-+ spin_lock_init(&per_cpu_ptr(conf->percpu, cpu)->lock);
- }
- put_online_cpus();
-
-Index: linux-stable/drivers/md/raid5.h
-===================================================================
---- linux-stable.orig/drivers/md/raid5.h
-+++ linux-stable/drivers/md/raid5.h
-@@ -456,6 +456,7 @@ struct r5conf {
- int recovery_disabled;
- /* per cpu variables */
- struct raid5_percpu {
-+ spinlock_t lock; /* Protection for -RT */
- struct page *spare_page; /* Used when checking P/Q in raid6 */
- void *scribble; /* space for constructing buffer
- * lists and performing address
-Index: linux-stable/kernel/futex.c
-===================================================================
---- linux-stable.orig/kernel/futex.c
-+++ linux-stable/kernel/futex.c
-@@ -710,7 +710,9 @@ void exit_pi_state_list(struct task_stru
- * task still owns the PI-state:
- */
- if (head->next != next) {
-+ raw_spin_unlock_irq(&curr->pi_lock);
- spin_unlock(&hb->lock);
-+ raw_spin_lock_irq(&curr->pi_lock);
- continue;
- }
-
-@@ -1710,6 +1712,16 @@ retry_private:
- requeue_pi_wake_futex(this, &key2, hb2);
- drop_count++;
- continue;
-+ } else if (ret == -EAGAIN) {
-+ /*
-+ * Waiter was woken by timeout or
-+ * signal and has set pi_blocked_on to
-+ * PI_WAKEUP_INPROGRESS before we
-+ * tried to enqueue it on the rtmutex.
-+ */
-+ this->pi_state = NULL;
-+ free_pi_state(pi_state);
-+ continue;
- } else if (ret) {
- /* -EDEADLK */
- this->pi_state = NULL;
-@@ -2563,7 +2575,7 @@ static int futex_wait_requeue_pi(u32 __u
- struct hrtimer_sleeper timeout, *to = NULL;
- struct rt_mutex_waiter rt_waiter;
- struct rt_mutex *pi_mutex = NULL;
-- struct futex_hash_bucket *hb;
-+ struct futex_hash_bucket *hb, *hb2;
- union futex_key key2 = FUTEX_KEY_INIT;
- struct futex_q q = futex_q_init;
- int res, ret;
-@@ -2588,10 +2600,7 @@ static int futex_wait_requeue_pi(u32 __u
- * The waiter is allocated on our stack, manipulated by the requeue
- * code while we sleep on uaddr.
- */
-- debug_rt_mutex_init_waiter(&rt_waiter);
-- RB_CLEAR_NODE(&rt_waiter.pi_tree_entry);
-- RB_CLEAR_NODE(&rt_waiter.tree_entry);
-- rt_waiter.task = NULL;
-+ rt_mutex_init_waiter(&rt_waiter, false);
-
- ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, VERIFY_WRITE);
- if (unlikely(ret != 0))
-@@ -2621,20 +2630,55 @@ static int futex_wait_requeue_pi(u32 __u
- /* Queue the futex_q, drop the hb lock, wait for wakeup. */
- futex_wait_queue_me(hb, &q, to);
-
-- spin_lock(&hb->lock);
-- ret = handle_early_requeue_pi_wakeup(hb, &q, &key2, to);
-- spin_unlock(&hb->lock);
-- if (ret)
-- goto out_put_keys;
-+ /*
-+ * On RT we must avoid races with requeue and trying to block
-+ * on two mutexes (hb->lock and uaddr2's rtmutex) by
-+ * serializing access to pi_blocked_on with pi_lock.
-+ */
-+ raw_spin_lock_irq(&current->pi_lock);
-+ if (current->pi_blocked_on) {
-+ /*
-+ * We have been requeued or are in the process of
-+ * being requeued.
-+ */
-+ raw_spin_unlock_irq(&current->pi_lock);
-+ } else {
-+ /*
-+ * Setting pi_blocked_on to PI_WAKEUP_INPROGRESS
-+ * prevents a concurrent requeue from moving us to the
-+ * uaddr2 rtmutex. After that we can safely acquire
-+ * (and possibly block on) hb->lock.
-+ */
-+ current->pi_blocked_on = PI_WAKEUP_INPROGRESS;
-+ raw_spin_unlock_irq(&current->pi_lock);
-+
-+ spin_lock(&hb->lock);
-+
-+ /*
-+ * Clean up pi_blocked_on. We might leak it otherwise
-+ * when we succeeded with the hb->lock in the fast
-+ * path.
-+ */
-+ raw_spin_lock_irq(&current->pi_lock);
-+ current->pi_blocked_on = NULL;
-+ raw_spin_unlock_irq(&current->pi_lock);
-+
-+ ret = handle_early_requeue_pi_wakeup(hb, &q, &key2, to);
-+ spin_unlock(&hb->lock);
-+ if (ret)
-+ goto out_put_keys;
-+ }
-
- /*
-- * In order for us to be here, we know our q.key == key2, and since
-- * we took the hb->lock above, we also know that futex_requeue() has
-- * completed and we no longer have to concern ourselves with a wakeup
-- * race with the atomic proxy lock acquisition by the requeue code. The
-- * futex_requeue dropped our key1 reference and incremented our key2
-- * reference count.
-+ * In order to be here, we have either been requeued, are in
-+ * the process of being requeued, or requeue successfully
-+ * acquired uaddr2 on our behalf. If pi_blocked_on was
-+ * non-null above, we may be racing with a requeue. Do not
-+ * rely on q->lock_ptr to be hb2->lock until after blocking on
-+ * hb->lock or hb2->lock. The futex_requeue dropped our key1
-+ * reference and incremented our key2 reference count.
- */
-+ hb2 = hash_futex(&key2);
-
- /* Check if the requeue code acquired the second futex for us. */
- if (!q.rt_waiter) {
-@@ -2643,9 +2687,10 @@ static int futex_wait_requeue_pi(u32 __u
- * did a lock-steal - fix up the PI-state in that case.
- */
- if (q.pi_state && (q.pi_state->owner != current)) {
-- spin_lock(q.lock_ptr);
-+ spin_lock(&hb2->lock);
-+ BUG_ON(&hb2->lock != q.lock_ptr);
- ret = fixup_pi_state_owner(uaddr2, &q, current);
-- spin_unlock(q.lock_ptr);
-+ spin_unlock(&hb2->lock);
- }
- } else {
- /*
-@@ -2658,7 +2703,8 @@ static int futex_wait_requeue_pi(u32 __u
- ret = rt_mutex_finish_proxy_lock(pi_mutex, to, &rt_waiter, 1);
- debug_rt_mutex_free_waiter(&rt_waiter);
-
-- spin_lock(q.lock_ptr);
-+ spin_lock(&hb2->lock);
-+ BUG_ON(&hb2->lock != q.lock_ptr);
- /*
- * Fixup the pi_state owner and possibly acquire the lock if we
- * haven't already.
-Index: linux-stable/kernel/locking/rtmutex_common.h
-===================================================================
---- linux-stable.orig/kernel/locking/rtmutex_common.h
-+++ linux-stable/kernel/locking/rtmutex_common.h
-@@ -49,6 +49,7 @@ struct rt_mutex_waiter {
- struct rb_node pi_tree_entry;
- struct task_struct *task;
- struct rt_mutex *lock;
-+ bool savestate;
- #ifdef CONFIG_DEBUG_RT_MUTEXES
- unsigned long ip;
- struct pid *deadlock_task_pid;
-@@ -104,6 +105,9 @@ static inline struct task_struct *rt_mut
- /*
- * PI-futex support (proxy locking functions, etc.):
- */
-+#define PI_WAKEUP_INPROGRESS ((struct rt_mutex_waiter *) 1)
-+#define PI_REQUEUE_INPROGRESS ((struct rt_mutex_waiter *) 2)
-+
- extern struct task_struct *rt_mutex_next_owner(struct rt_mutex *lock);
- extern void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
- struct task_struct *proxy_owner);
-@@ -124,4 +128,14 @@ extern int rt_mutex_finish_proxy_lock(st
- # include "rtmutex.h"
- #endif
-
-+static inline void
-+rt_mutex_init_waiter(struct rt_mutex_waiter *waiter, bool savestate)
-+{
-+ debug_rt_mutex_init_waiter(waiter);
-+ waiter->task = NULL;
-+ waiter->savestate = savestate;
-+ RB_CLEAR_NODE(&waiter->pi_tree_entry);
-+ RB_CLEAR_NODE(&waiter->tree_entry);
-+}
-+
- #endif
-Index: linux-stable/include/linux/rtmutex.h
-===================================================================
---- linux-stable.orig/include/linux/rtmutex.h
-+++ linux-stable/include/linux/rtmutex.h
-@@ -14,10 +14,14 @@
-
- #include <linux/linkage.h>
- #include <linux/rbtree.h>
--#include <linux/spinlock_types.h>
-+#include <linux/spinlock_types_raw.h>
-
- extern int max_lock_depth; /* for sysctl */
-
-+#ifdef CONFIG_DEBUG_MUTEXES
-+#include <linux/debug_locks.h>
-+#endif
-+
- /**
- * The rt_mutex structure
- *
-@@ -31,8 +35,8 @@ struct rt_mutex {
- struct rb_root waiters;
- struct rb_node *waiters_leftmost;
- struct task_struct *owner;
--#ifdef CONFIG_DEBUG_RT_MUTEXES
- int save_state;
-+#ifdef CONFIG_DEBUG_RT_MUTEXES
- const char *name, *file;
- int line;
- void *magic;
-@@ -55,22 +59,33 @@ struct hrtimer_sleeper;
- # define rt_mutex_debug_check_no_locks_held(task) do { } while (0)
- #endif
-
-+# define rt_mutex_init(mutex) \
-+ do { \
-+ raw_spin_lock_init(&(mutex)->wait_lock); \
-+ __rt_mutex_init(mutex, #mutex); \
-+ } while (0)
-+
- #ifdef CONFIG_DEBUG_RT_MUTEXES
- # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \
- , .name = #mutexname, .file = __FILE__, .line = __LINE__
--# define rt_mutex_init(mutex) __rt_mutex_init(mutex, __func__)
- extern void rt_mutex_debug_task_free(struct task_struct *tsk);
- #else
- # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname)
--# define rt_mutex_init(mutex) __rt_mutex_init(mutex, NULL)
- # define rt_mutex_debug_task_free(t) do { } while (0)
- #endif
-
--#define __RT_MUTEX_INITIALIZER(mutexname) \
-- { .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
-+#define __RT_MUTEX_INITIALIZER_PLAIN(mutexname) \
-+ .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
- , .waiters = RB_ROOT \
- , .owner = NULL \
-- __DEBUG_RT_MUTEX_INITIALIZER(mutexname)}
-+ __DEBUG_RT_MUTEX_INITIALIZER(mutexname)
-+
-+#define __RT_MUTEX_INITIALIZER(mutexname) \
-+ { __RT_MUTEX_INITIALIZER_PLAIN(mutexname) }
-+
-+#define __RT_MUTEX_INITIALIZER_SAVE_STATE(mutexname) \
-+ { __RT_MUTEX_INITIALIZER_PLAIN(mutexname) \
-+ , .save_state = 1 }
-
- #define DEFINE_RT_MUTEX(mutexname) \
- struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname)
-@@ -92,6 +107,7 @@ extern void rt_mutex_destroy(struct rt_m
- extern void rt_mutex_lock(struct rt_mutex *lock);
- extern int rt_mutex_lock_interruptible(struct rt_mutex *lock,
- int detect_deadlock);
-+extern int rt_mutex_lock_killable(struct rt_mutex *lock, int detect_deadlock);
- extern int rt_mutex_timed_lock(struct rt_mutex *lock,
- struct hrtimer_sleeper *timeout,
- int detect_deadlock);
-Index: linux-stable/include/linux/rwlock_types.h
-===================================================================
---- linux-stable.orig/include/linux/rwlock_types.h
-+++ linux-stable/include/linux/rwlock_types.h
-@@ -1,6 +1,10 @@
- #ifndef __LINUX_RWLOCK_TYPES_H
- #define __LINUX_RWLOCK_TYPES_H
-
-+#if !defined(__LINUX_SPINLOCK_TYPES_H)
-+# error "Do not include directly, include spinlock_types.h"
-+#endif
-+
- /*
- * include/linux/rwlock_types.h - generic rwlock type definitions
- * and initializers
-@@ -43,6 +47,7 @@ typedef struct {
- RW_DEP_MAP_INIT(lockname) }
- #endif
-
--#define DEFINE_RWLOCK(x) rwlock_t x = __RW_LOCK_UNLOCKED(x)
-+#define DEFINE_RWLOCK(name) \
-+ rwlock_t name __cacheline_aligned_in_smp = __RW_LOCK_UNLOCKED(name)
-
- #endif /* __LINUX_RWLOCK_TYPES_H */
-Index: linux-stable/include/linux/spinlock_types.h
-===================================================================
---- linux-stable.orig/include/linux/spinlock_types.h
-+++ linux-stable/include/linux/spinlock_types.h
-@@ -9,80 +9,15 @@
- * Released under the General Public License (GPL).
- */
-
--#if defined(CONFIG_SMP)
--# include <asm/spinlock_types.h>
--#else
--# include <linux/spinlock_types_up.h>
--#endif
--
--#include <linux/lockdep.h>
--
--typedef struct raw_spinlock {
-- arch_spinlock_t raw_lock;
--#ifdef CONFIG_GENERIC_LOCKBREAK
-- unsigned int break_lock;
--#endif
--#ifdef CONFIG_DEBUG_SPINLOCK
-- unsigned int magic, owner_cpu;
-- void *owner;
--#endif
--#ifdef CONFIG_DEBUG_LOCK_ALLOC
-- struct lockdep_map dep_map;
--#endif
--} raw_spinlock_t;
--
--#define SPINLOCK_MAGIC 0xdead4ead
--
--#define SPINLOCK_OWNER_INIT ((void *)-1L)
--
--#ifdef CONFIG_DEBUG_LOCK_ALLOC
--# define SPIN_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
--#else
--# define SPIN_DEP_MAP_INIT(lockname)
--#endif
-+#include <linux/spinlock_types_raw.h>
-
--#ifdef CONFIG_DEBUG_SPINLOCK
--# define SPIN_DEBUG_INIT(lockname) \
-- .magic = SPINLOCK_MAGIC, \
-- .owner_cpu = -1, \
-- .owner = SPINLOCK_OWNER_INIT,
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+# include <linux/spinlock_types_nort.h>
-+# include <linux/rwlock_types.h>
- #else
--# define SPIN_DEBUG_INIT(lockname)
-+# include <linux/rtmutex.h>
-+# include <linux/spinlock_types_rt.h>
-+# include <linux/rwlock_types_rt.h>
- #endif
-
--#define __RAW_SPIN_LOCK_INITIALIZER(lockname) \
-- { \
-- .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
-- SPIN_DEBUG_INIT(lockname) \
-- SPIN_DEP_MAP_INIT(lockname) }
--
--#define __RAW_SPIN_LOCK_UNLOCKED(lockname) \
-- (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)
--
--#define DEFINE_RAW_SPINLOCK(x) raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x)
--
--typedef struct spinlock {
-- union {
-- struct raw_spinlock rlock;
--
--#ifdef CONFIG_DEBUG_LOCK_ALLOC
--# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
-- struct {
-- u8 __padding[LOCK_PADSIZE];
-- struct lockdep_map dep_map;
-- };
--#endif
-- };
--} spinlock_t;
--
--#define __SPIN_LOCK_INITIALIZER(lockname) \
-- { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }
--
--#define __SPIN_LOCK_UNLOCKED(lockname) \
-- (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)
--
--#define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
--
--#include <linux/rwlock_types.h>
--
- #endif /* __LINUX_SPINLOCK_TYPES_H */
-Index: linux-stable/include/linux/spinlock_types_nort.h
-===================================================================
---- /dev/null
-+++ linux-stable/include/linux/spinlock_types_nort.h
-@@ -0,0 +1,33 @@
-+#ifndef __LINUX_SPINLOCK_TYPES_NORT_H
-+#define __LINUX_SPINLOCK_TYPES_NORT_H
-+
-+#ifndef __LINUX_SPINLOCK_TYPES_H
-+#error "Do not include directly. Include spinlock_types.h instead"
-+#endif
-+
-+/*
-+ * The non RT version maps spinlocks to raw_spinlocks
-+ */
-+typedef struct spinlock {
-+ union {
-+ struct raw_spinlock rlock;
-+
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
-+ struct {
-+ u8 __padding[LOCK_PADSIZE];
-+ struct lockdep_map dep_map;
-+ };
-+#endif
-+ };
-+} spinlock_t;
-+
-+#define __SPIN_LOCK_INITIALIZER(lockname) \
-+ { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }
-+
-+#define __SPIN_LOCK_UNLOCKED(lockname) \
-+ (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)
-+
-+#define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
-+
-+#endif
-Index: linux-stable/include/linux/spinlock_types_raw.h
-===================================================================
---- /dev/null
-+++ linux-stable/include/linux/spinlock_types_raw.h
-@@ -0,0 +1,56 @@
-+#ifndef __LINUX_SPINLOCK_TYPES_RAW_H
-+#define __LINUX_SPINLOCK_TYPES_RAW_H
-+
-+#if defined(CONFIG_SMP)
-+# include <asm/spinlock_types.h>
-+#else
-+# include <linux/spinlock_types_up.h>
-+#endif
-+
-+#include <linux/lockdep.h>
-+
-+typedef struct raw_spinlock {
-+ arch_spinlock_t raw_lock;
-+#ifdef CONFIG_GENERIC_LOCKBREAK
-+ unsigned int break_lock;
-+#endif
-+#ifdef CONFIG_DEBUG_SPINLOCK
-+ unsigned int magic, owner_cpu;
-+ void *owner;
-+#endif
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+ struct lockdep_map dep_map;
-+#endif
-+} raw_spinlock_t;
-+
-+#define SPINLOCK_MAGIC 0xdead4ead
-+
-+#define SPINLOCK_OWNER_INIT ((void *)-1L)
-+
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+# define SPIN_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
-+#else
-+# define SPIN_DEP_MAP_INIT(lockname)
-+#endif
-+
-+#ifdef CONFIG_DEBUG_SPINLOCK
-+# define SPIN_DEBUG_INIT(lockname) \
-+ .magic = SPINLOCK_MAGIC, \
-+ .owner_cpu = -1, \
-+ .owner = SPINLOCK_OWNER_INIT,
-+#else
-+# define SPIN_DEBUG_INIT(lockname)
-+#endif
-+
-+#define __RAW_SPIN_LOCK_INITIALIZER(lockname) \
-+ { \
-+ .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
-+ SPIN_DEBUG_INIT(lockname) \
-+ SPIN_DEP_MAP_INIT(lockname) }
-+
-+#define __RAW_SPIN_LOCK_UNLOCKED(lockname) \
-+ (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)
-+
-+#define DEFINE_RAW_SPINLOCK(x) raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x)
-+
-+#endif
-Index: linux-stable/include/linux/rwlock_types_rt.h
-===================================================================
---- /dev/null
-+++ linux-stable/include/linux/rwlock_types_rt.h
-@@ -0,0 +1,33 @@
-+#ifndef __LINUX_RWLOCK_TYPES_RT_H
-+#define __LINUX_RWLOCK_TYPES_RT_H
-+
-+#ifndef __LINUX_SPINLOCK_TYPES_H
-+#error "Do not include directly. Include spinlock_types.h instead"
-+#endif
-+
-+/*
-+ * rwlocks - rtmutex which allows single reader recursion
-+ */
-+typedef struct {
-+ struct rt_mutex lock;
-+ int read_depth;
-+ unsigned int break_lock;
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+ struct lockdep_map dep_map;
-+#endif
-+} rwlock_t;
-+
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+# define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
-+#else
-+# define RW_DEP_MAP_INIT(lockname)
-+#endif
-+
-+#define __RW_LOCK_UNLOCKED(name) \
-+ { .lock = __RT_MUTEX_INITIALIZER_SAVE_STATE(name.lock), \
-+ RW_DEP_MAP_INIT(name) }
-+
-+#define DEFINE_RWLOCK(name) \
-+ rwlock_t name __cacheline_aligned_in_smp = __RW_LOCK_UNLOCKED(name)
-+
-+#endif
-Index: linux-stable/include/linux/spinlock_types_rt.h
-===================================================================
---- /dev/null
-+++ linux-stable/include/linux/spinlock_types_rt.h
-@@ -0,0 +1,51 @@
-+#ifndef __LINUX_SPINLOCK_TYPES_RT_H
-+#define __LINUX_SPINLOCK_TYPES_RT_H
-+
-+#ifndef __LINUX_SPINLOCK_TYPES_H
-+#error "Do not include directly. Include spinlock_types.h instead"
-+#endif
-+
-+#include <linux/cache.h>
-+
-+/*
-+ * PREEMPT_RT: spinlocks - an RT mutex plus lock-break field:
-+ */
-+typedef struct spinlock {
-+ struct rt_mutex lock;
-+ unsigned int break_lock;
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+ struct lockdep_map dep_map;
-+#endif
-+} spinlock_t;
-+
-+#ifdef CONFIG_DEBUG_RT_MUTEXES
-+# define __RT_SPIN_INITIALIZER(name) \
-+ { \
-+ .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock), \
-+ .save_state = 1, \
-+ .file = __FILE__, \
-+ .line = __LINE__ , \
-+ }
-+#else
-+# define __RT_SPIN_INITIALIZER(name) \
-+ { \
-+ .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock), \
-+ .save_state = 1, \
-+ }
-+#endif
-+
-+/*
-+.wait_list = PLIST_HEAD_INIT_RAW((name).lock.wait_list, (name).lock.wait_lock)
-+*/
-+
-+#define __SPIN_LOCK_UNLOCKED(name) \
-+ { .lock = __RT_SPIN_INITIALIZER(name.lock), \
-+ SPIN_DEP_MAP_INIT(name) }
-+
-+#define __DEFINE_SPINLOCK(name) \
-+ spinlock_t name = __SPIN_LOCK_UNLOCKED(name)
-+
-+#define DEFINE_SPINLOCK(name) \
-+ spinlock_t name __cacheline_aligned_in_smp = __SPIN_LOCK_UNLOCKED(name)
-+
-+#endif
-Index: linux-stable/include/linux/mutex.h
-===================================================================
---- linux-stable.orig/include/linux/mutex.h
-+++ linux-stable/include/linux/mutex.h
-@@ -18,6 +18,17 @@
- #include <linux/atomic.h>
- #include <asm/processor.h>
-
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \
-+ , .dep_map = { .name = #lockname }
-+#else
-+# define __DEP_MAP_MUTEX_INITIALIZER(lockname)
-+#endif
-+
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+# include <linux/mutex_rt.h>
-+#else
-+
- /*
- * Simple, straightforward mutexes with strict semantics:
- *
-@@ -99,13 +110,6 @@ do { \
- static inline void mutex_destroy(struct mutex *lock) {}
- #endif
-
--#ifdef CONFIG_DEBUG_LOCK_ALLOC
--# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \
-- , .dep_map = { .name = #lockname }
--#else
--# define __DEP_MAP_MUTEX_INITIALIZER(lockname)
--#endif
--
- #define __MUTEX_INITIALIZER(lockname) \
- { .count = ATOMIC_INIT(1) \
- , .wait_lock = __SPIN_LOCK_UNLOCKED(lockname.wait_lock) \
-@@ -173,6 +177,8 @@ extern int __must_check mutex_lock_killa
- extern int mutex_trylock(struct mutex *lock);
- extern void mutex_unlock(struct mutex *lock);
-
-+#endif /* !PREEMPT_RT_FULL */
-+
- extern int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock);
-
- #ifndef arch_mutex_cpu_relax
-Index: linux-stable/include/linux/mutex_rt.h
-===================================================================
---- /dev/null
-+++ linux-stable/include/linux/mutex_rt.h
-@@ -0,0 +1,84 @@
-+#ifndef __LINUX_MUTEX_RT_H
-+#define __LINUX_MUTEX_RT_H
-+
-+#ifndef __LINUX_MUTEX_H
-+#error "Please include mutex.h"
-+#endif
-+
-+#include <linux/rtmutex.h>
-+
-+/* FIXME: Just for __lockfunc */
-+#include <linux/spinlock.h>
-+
-+struct mutex {
-+ struct rt_mutex lock;
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+ struct lockdep_map dep_map;
-+#endif
-+};
-+
-+#define __MUTEX_INITIALIZER(mutexname) \
-+ { \
-+ .lock = __RT_MUTEX_INITIALIZER(mutexname.lock) \
-+ __DEP_MAP_MUTEX_INITIALIZER(mutexname) \
-+ }
-+
-+#define DEFINE_MUTEX(mutexname) \
-+ struct mutex mutexname = __MUTEX_INITIALIZER(mutexname)
-+
-+extern void __mutex_do_init(struct mutex *lock, const char *name, struct lock_class_key *key);
-+extern void __lockfunc _mutex_lock(struct mutex *lock);
-+extern int __lockfunc _mutex_lock_interruptible(struct mutex *lock);
-+extern int __lockfunc _mutex_lock_killable(struct mutex *lock);
-+extern void __lockfunc _mutex_lock_nested(struct mutex *lock, int subclass);
-+extern void __lockfunc _mutex_lock_nest_lock(struct mutex *lock, struct lockdep_map *nest_lock);
-+extern int __lockfunc _mutex_lock_interruptible_nested(struct mutex *lock, int subclass);
-+extern int __lockfunc _mutex_lock_killable_nested(struct mutex *lock, int subclass);
-+extern int __lockfunc _mutex_trylock(struct mutex *lock);
-+extern void __lockfunc _mutex_unlock(struct mutex *lock);
-+
-+#define mutex_is_locked(l) rt_mutex_is_locked(&(l)->lock)
-+#define mutex_lock(l) _mutex_lock(l)
-+#define mutex_lock_interruptible(l) _mutex_lock_interruptible(l)
-+#define mutex_lock_killable(l) _mutex_lock_killable(l)
-+#define mutex_trylock(l) _mutex_trylock(l)
-+#define mutex_unlock(l) _mutex_unlock(l)
-+#define mutex_destroy(l) rt_mutex_destroy(&(l)->lock)
-+
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+# define mutex_lock_nested(l, s) _mutex_lock_nested(l, s)
-+# define mutex_lock_interruptible_nested(l, s) \
-+ _mutex_lock_interruptible_nested(l, s)
-+# define mutex_lock_killable_nested(l, s) \
-+ _mutex_lock_killable_nested(l, s)
-+
-+# define mutex_lock_nest_lock(lock, nest_lock) \
-+do { \
-+ typecheck(struct lockdep_map *, &(nest_lock)->dep_map); \
-+ _mutex_lock_nest_lock(lock, &(nest_lock)->dep_map); \
-+} while (0)
-+
-+#else
-+# define mutex_lock_nested(l, s) _mutex_lock(l)
-+# define mutex_lock_interruptible_nested(l, s) \
-+ _mutex_lock_interruptible(l)
-+# define mutex_lock_killable_nested(l, s) \
-+ _mutex_lock_killable(l)
-+# define mutex_lock_nest_lock(lock, nest_lock) mutex_lock(lock)
-+#endif
-+
-+# define mutex_init(mutex) \
-+do { \
-+ static struct lock_class_key __key; \
-+ \
-+ rt_mutex_init(&(mutex)->lock); \
-+ __mutex_do_init((mutex), #mutex, &__key); \
-+} while (0)
-+
-+# define __mutex_init(mutex, name, key) \
-+do { \
-+ rt_mutex_init(&(mutex)->lock); \
-+ __mutex_do_init((mutex), name, key); \
-+} while (0)
-+
-+#endif
-Index: linux-stable/include/linux/rwsem.h
-===================================================================
---- linux-stable.orig/include/linux/rwsem.h
-+++ linux-stable/include/linux/rwsem.h
-@@ -16,6 +16,10 @@
-
- #include <linux/atomic.h>
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+#include <linux/rwsem_rt.h>
-+#else /* PREEMPT_RT_FULL */
-+
- struct rw_semaphore;
-
- #ifdef CONFIG_RWSEM_GENERIC_SPINLOCK
-@@ -160,4 +164,6 @@ extern void up_read_non_owner(struct rw_
- # define up_read_non_owner(sem) up_read(sem)
- #endif
-
-+#endif /* !PREEMPT_RT_FULL */
-+
- #endif /* _LINUX_RWSEM_H */
-Index: linux-stable/include/linux/rwsem_rt.h
-===================================================================
---- /dev/null
-+++ linux-stable/include/linux/rwsem_rt.h
-@@ -0,0 +1,133 @@
-+#ifndef _LINUX_RWSEM_RT_H
-+#define _LINUX_RWSEM_RT_H
-+
-+#ifndef _LINUX_RWSEM_H
-+#error "Include rwsem.h"
-+#endif
-+
-+/*
-+ * RW-semaphores are a spinlock plus a reader-depth count.
-+ *
-+ * Note that the semantics are different from the usual
-+ * Linux rw-sems, in PREEMPT_RT mode we do not allow
-+ * multiple readers to hold the lock at once, we only allow
-+ * a read-lock owner to read-lock recursively. This is
-+ * better for latency, makes the implementation inherently
-+ * fair and makes it simpler as well.
-+ */
-+
-+#include <linux/rtmutex.h>
-+
-+struct rw_semaphore {
-+ struct rt_mutex lock;
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+ struct lockdep_map dep_map;
-+#endif
-+};
-+
-+#define __RWSEM_INITIALIZER(name) \
-+ { .lock = __RT_MUTEX_INITIALIZER(name.lock), \
-+ RW_DEP_MAP_INIT(name) }
-+
-+#define DECLARE_RWSEM(lockname) \
-+ struct rw_semaphore lockname = __RWSEM_INITIALIZER(lockname)
-+
-+extern void __rt_rwsem_init(struct rw_semaphore *rwsem, const char *name,
-+ struct lock_class_key *key);
-+
-+#define __rt_init_rwsem(sem, name, key) \
-+ do { \
-+ rt_mutex_init(&(sem)->lock); \
-+ __rt_rwsem_init((sem), (name), (key));\
-+ } while (0)
-+
-+#define __init_rwsem(sem, name, key) __rt_init_rwsem(sem, name, key)
-+
-+# define rt_init_rwsem(sem) \
-+do { \
-+ static struct lock_class_key __key; \
-+ \
-+ __rt_init_rwsem((sem), #sem, &__key); \
-+} while (0)
-+
-+extern void rt_down_write(struct rw_semaphore *rwsem);
-+extern void rt_down_read_nested(struct rw_semaphore *rwsem, int subclass);
-+extern void rt_down_write_nested(struct rw_semaphore *rwsem, int subclass);
-+extern void rt_down_write_nested_lock(struct rw_semaphore *rwsem,
-+ struct lockdep_map *nest);
-+extern void rt_down_read(struct rw_semaphore *rwsem);
-+extern int rt_down_write_trylock(struct rw_semaphore *rwsem);
-+extern int rt_down_read_trylock(struct rw_semaphore *rwsem);
-+extern void rt_up_read(struct rw_semaphore *rwsem);
-+extern void rt_up_write(struct rw_semaphore *rwsem);
-+extern void rt_downgrade_write(struct rw_semaphore *rwsem);
-+
-+#define init_rwsem(sem) rt_init_rwsem(sem)
-+#define rwsem_is_locked(s) rt_mutex_is_locked(&(s)->lock)
-+
-+static inline int rwsem_is_contended(struct rw_semaphore *sem)
-+{
-+ /* rt_mutex_has_waiters() */
-+ return !RB_EMPTY_ROOT(&sem->lock.waiters);
-+}
-+
-+static inline void down_read(struct rw_semaphore *sem)
-+{
-+ rt_down_read(sem);
-+}
-+
-+static inline int down_read_trylock(struct rw_semaphore *sem)
-+{
-+ return rt_down_read_trylock(sem);
-+}
-+
-+static inline void down_write(struct rw_semaphore *sem)
-+{
-+ rt_down_write(sem);
-+}
-+
-+static inline int down_write_trylock(struct rw_semaphore *sem)
-+{
-+ return rt_down_write_trylock(sem);
-+}
-+
-+static inline void up_read(struct rw_semaphore *sem)
-+{
-+ rt_up_read(sem);
-+}
-+
-+static inline void up_write(struct rw_semaphore *sem)
-+{
-+ rt_up_write(sem);
-+}
-+
-+static inline void downgrade_write(struct rw_semaphore *sem)
-+{
-+ rt_downgrade_write(sem);
-+}
-+
-+static inline void down_read_nested(struct rw_semaphore *sem, int subclass)
-+{
-+ return rt_down_read_nested(sem, subclass);
-+}
-+
-+static inline void down_write_nested(struct rw_semaphore *sem, int subclass)
-+{
-+ rt_down_write_nested(sem, subclass);
-+}
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+static inline void down_write_nest_lock(struct rw_semaphore *sem,
-+ struct rw_semaphore *nest_lock)
-+{
-+ rt_down_write_nested_lock(sem, &nest_lock->dep_map);
-+}
-+
-+#else
-+
-+static inline void down_write_nest_lock(struct rw_semaphore *sem,
-+ struct rw_semaphore *nest_lock)
-+{
-+ rt_down_write_nested_lock(sem, NULL);
-+}
-+#endif
-+#endif
-Index: linux-stable/kernel/locking/Makefile
-===================================================================
---- linux-stable.orig/kernel/locking/Makefile
-+++ linux-stable/kernel/locking/Makefile
-@@ -1,5 +1,5 @@
-
--obj-y += mutex.o semaphore.o rwsem.o lglock.o
-+obj-y += semaphore.o lglock.o
-
- ifdef CONFIG_FUNCTION_TRACER
- CFLAGS_REMOVE_lockdep.o = -pg
-@@ -8,7 +8,11 @@ CFLAGS_REMOVE_mutex-debug.o = -pg
- CFLAGS_REMOVE_rtmutex-debug.o = -pg
- endif
-
-+ifneq ($(CONFIG_PREEMPT_RT_FULL),y)
-+obj-y += mutex.o
- obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o
-+obj-y += rwsem.o
-+endif
- obj-$(CONFIG_LOCKDEP) += lockdep.o
- ifeq ($(CONFIG_PROC_FS),y)
- obj-$(CONFIG_LOCKDEP) += lockdep_proc.o
-@@ -20,6 +24,9 @@ obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmute
- obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.o
- obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o
- obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o
-+ifneq ($(CONFIG_PREEMPT_RT_FULL),y)
- obj-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
- obj-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem-xadd.o
-+endif
- obj-$(CONFIG_PERCPU_RWSEM) += percpu-rwsem.o
-+obj-$(CONFIG_PREEMPT_RT_FULL) += rt.o
-Index: linux-stable/include/linux/rwlock_rt.h
-===================================================================
---- /dev/null
-+++ linux-stable/include/linux/rwlock_rt.h
-@@ -0,0 +1,99 @@
-+#ifndef __LINUX_RWLOCK_RT_H
-+#define __LINUX_RWLOCK_RT_H
-+
-+#ifndef __LINUX_SPINLOCK_H
-+#error Do not include directly. Use spinlock.h
-+#endif
-+
-+#define rwlock_init(rwl) \
-+do { \
-+ static struct lock_class_key __key; \
-+ \
-+ rt_mutex_init(&(rwl)->lock); \
-+ __rt_rwlock_init(rwl, #rwl, &__key); \
-+} while (0)
-+
-+extern void __lockfunc rt_write_lock(rwlock_t *rwlock);
-+extern void __lockfunc rt_read_lock(rwlock_t *rwlock);
-+extern int __lockfunc rt_write_trylock(rwlock_t *rwlock);
-+extern int __lockfunc rt_write_trylock_irqsave(rwlock_t *trylock, unsigned long *flags);
-+extern int __lockfunc rt_read_trylock(rwlock_t *rwlock);
-+extern void __lockfunc rt_write_unlock(rwlock_t *rwlock);
-+extern void __lockfunc rt_read_unlock(rwlock_t *rwlock);
-+extern unsigned long __lockfunc rt_write_lock_irqsave(rwlock_t *rwlock);
-+extern unsigned long __lockfunc rt_read_lock_irqsave(rwlock_t *rwlock);
-+extern void __rt_rwlock_init(rwlock_t *rwlock, char *name, struct lock_class_key *key);
-+
-+#define read_trylock(lock) __cond_lock(lock, rt_read_trylock(lock))
-+#define write_trylock(lock) __cond_lock(lock, rt_write_trylock(lock))
-+
-+#define write_trylock_irqsave(lock, flags) \
-+ __cond_lock(lock, rt_write_trylock_irqsave(lock, &flags))
-+
-+#define read_lock_irqsave(lock, flags) \
-+ do { \
-+ typecheck(unsigned long, flags); \
-+ flags = rt_read_lock_irqsave(lock); \
-+ } while (0)
-+
-+#define write_lock_irqsave(lock, flags) \
-+ do { \
-+ typecheck(unsigned long, flags); \
-+ flags = rt_write_lock_irqsave(lock); \
-+ } while (0)
-+
-+#define read_lock(lock) rt_read_lock(lock)
-+
-+#define read_lock_bh(lock) \
-+ do { \
-+ local_bh_disable(); \
-+ rt_read_lock(lock); \
-+ } while (0)
-+
-+#define read_lock_irq(lock) read_lock(lock)
-+
-+#define write_lock(lock) rt_write_lock(lock)
-+
-+#define write_lock_bh(lock) \
-+ do { \
-+ local_bh_disable(); \
-+ rt_write_lock(lock); \
-+ } while (0)
-+
-+#define write_lock_irq(lock) write_lock(lock)
-+
-+#define read_unlock(lock) rt_read_unlock(lock)
-+
-+#define read_unlock_bh(lock) \
-+ do { \
-+ rt_read_unlock(lock); \
-+ local_bh_enable(); \
-+ } while (0)
-+
-+#define read_unlock_irq(lock) read_unlock(lock)
-+
-+#define write_unlock(lock) rt_write_unlock(lock)
-+
-+#define write_unlock_bh(lock) \
-+ do { \
-+ rt_write_unlock(lock); \
-+ local_bh_enable(); \
-+ } while (0)
-+
-+#define write_unlock_irq(lock) write_unlock(lock)
-+
-+#define read_unlock_irqrestore(lock, flags) \
-+ do { \
-+ typecheck(unsigned long, flags); \
-+ (void) flags; \
-+ rt_read_unlock(lock); \
-+ } while (0)
-+
-+#define write_unlock_irqrestore(lock, flags) \
-+ do { \
-+ typecheck(unsigned long, flags); \
-+ (void) flags; \
-+ rt_write_unlock(lock); \
-+ } while (0)
-+
-+#endif
-Index: linux-stable/include/linux/spinlock.h
-===================================================================
---- linux-stable.orig/include/linux/spinlock.h
-+++ linux-stable/include/linux/spinlock.h
-@@ -272,7 +272,11 @@ static inline void do_raw_spin_unlock(ra
- #define raw_spin_can_lock(lock) (!raw_spin_is_locked(lock))
-
- /* Include rwlock functions */
--#include <linux/rwlock.h>
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+# include <linux/rwlock_rt.h>
-+#else
-+# include <linux/rwlock.h>
-+#endif
-
- /*
- * Pull the _spin_*()/_read_*()/_write_*() functions/declarations:
-@@ -283,6 +287,10 @@ static inline void do_raw_spin_unlock(ra
- # include <linux/spinlock_api_up.h>
- #endif
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+# include <linux/spinlock_rt.h>
-+#else /* PREEMPT_RT_FULL */
-+
- /*
- * Map the spin_lock functions to the raw variants for PREEMPT_RT=n
- */
-@@ -412,4 +420,6 @@ extern int _atomic_dec_and_lock(atomic_t
- #define atomic_dec_and_lock(atomic, lock) \
- __cond_lock(lock, _atomic_dec_and_lock(atomic, lock))
-
-+#endif /* !PREEMPT_RT_FULL */
-+
- #endif /* __LINUX_SPINLOCK_H */
-Index: linux-stable/include/linux/spinlock_api_smp.h
-===================================================================
---- linux-stable.orig/include/linux/spinlock_api_smp.h
-+++ linux-stable/include/linux/spinlock_api_smp.h
-@@ -187,6 +187,8 @@ static inline int __raw_spin_trylock_bh(
- return 0;
- }
-
--#include <linux/rwlock_api_smp.h>
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+# include <linux/rwlock_api_smp.h>
-+#endif
-
- #endif /* __LINUX_SPINLOCK_API_SMP_H */
-Index: linux-stable/include/linux/spinlock_rt.h
-===================================================================
---- /dev/null
-+++ linux-stable/include/linux/spinlock_rt.h
-@@ -0,0 +1,167 @@
-+#ifndef __LINUX_SPINLOCK_RT_H
-+#define __LINUX_SPINLOCK_RT_H
-+
-+#ifndef __LINUX_SPINLOCK_H
-+#error Do not include directly. Use spinlock.h
-+#endif
-+
-+#include <linux/bug.h>
-+
-+extern void
-+__rt_spin_lock_init(spinlock_t *lock, char *name, struct lock_class_key *key);
-+
-+#define spin_lock_init(slock) \
-+do { \
-+ static struct lock_class_key __key; \
-+ \
-+ rt_mutex_init(&(slock)->lock); \
-+ __rt_spin_lock_init(slock, #slock, &__key); \
-+} while (0)
-+
-+extern void __lockfunc rt_spin_lock(spinlock_t *lock);
-+extern unsigned long __lockfunc rt_spin_lock_trace_flags(spinlock_t *lock);
-+extern void __lockfunc rt_spin_lock_nested(spinlock_t *lock, int subclass);
-+extern void __lockfunc rt_spin_unlock(spinlock_t *lock);
-+extern void __lockfunc rt_spin_unlock_after_trylock_in_irq(spinlock_t *lock);
-+extern void __lockfunc rt_spin_unlock_wait(spinlock_t *lock);
-+extern int __lockfunc rt_spin_trylock_irqsave(spinlock_t *lock, unsigned long *flags);
-+extern int __lockfunc rt_spin_trylock_bh(spinlock_t *lock);
-+extern int __lockfunc rt_spin_trylock(spinlock_t *lock);
-+extern int atomic_dec_and_spin_lock(atomic_t *atomic, spinlock_t *lock);
-+
-+/*
-+ * lockdep-less calls, for derived types like rwlock:
-+ * (for trylock they can use rt_mutex_trylock() directly.
-+ */
-+extern void __lockfunc __rt_spin_lock(struct rt_mutex *lock);
-+extern void __lockfunc __rt_spin_unlock(struct rt_mutex *lock);
-+extern int __lockfunc __rt_spin_trylock(struct rt_mutex *lock);
-+
-+#define spin_lock(lock) \
-+ do { \
-+ migrate_disable(); \
-+ rt_spin_lock(lock); \
-+ } while (0)
-+
-+#define spin_lock_bh(lock) \
-+ do { \
-+ local_bh_disable(); \
-+ migrate_disable(); \
-+ rt_spin_lock(lock); \
-+ } while (0)
-+
-+#define spin_lock_irq(lock) spin_lock(lock)
-+
-+#define spin_do_trylock(lock) __cond_lock(lock, rt_spin_trylock(lock))
-+
-+#define spin_trylock(lock) \
-+({ \
-+ int __locked; \
-+ migrate_disable(); \
-+ __locked = spin_do_trylock(lock); \
-+ if (!__locked) \
-+ migrate_enable(); \
-+ __locked; \
-+})
-+
-+#ifdef CONFIG_LOCKDEP
-+# define spin_lock_nested(lock, subclass) \
-+ do { \
-+ migrate_disable(); \
-+ rt_spin_lock_nested(lock, subclass); \
-+ } while (0)
-+
-+# define spin_lock_irqsave_nested(lock, flags, subclass) \
-+ do { \
-+ typecheck(unsigned long, flags); \
-+ flags = 0; \
-+ migrate_disable(); \
-+ rt_spin_lock_nested(lock, subclass); \
-+ } while (0)
-+#else
-+# define spin_lock_nested(lock, subclass) spin_lock(lock)
-+
-+# define spin_lock_irqsave_nested(lock, flags, subclass) \
-+ do { \
-+ typecheck(unsigned long, flags); \
-+ flags = 0; \
-+ spin_lock(lock); \
-+ } while (0)
-+#endif
-+
-+#define spin_lock_irqsave(lock, flags) \
-+ do { \
-+ typecheck(unsigned long, flags); \
-+ flags = 0; \
-+ spin_lock(lock); \
-+ } while (0)
-+
-+static inline unsigned long spin_lock_trace_flags(spinlock_t *lock)
-+{
-+ unsigned long flags = 0;
-+#ifdef CONFIG_TRACE_IRQFLAGS
-+ flags = rt_spin_lock_trace_flags(lock);
-+#else
-+ spin_lock(lock); /* lock_local */
-+#endif
-+ return flags;
-+}
-+
-+/* FIXME: we need rt_spin_lock_nest_lock */
-+#define spin_lock_nest_lock(lock, nest_lock) spin_lock_nested(lock, 0)
-+
-+#define spin_unlock(lock) \
-+ do { \
-+ rt_spin_unlock(lock); \
-+ migrate_enable(); \
-+ } while (0)
-+
-+#define spin_unlock_bh(lock) \
-+ do { \
-+ rt_spin_unlock(lock); \
-+ migrate_enable(); \
-+ local_bh_enable(); \
-+ } while (0)
-+
-+#define spin_unlock_irq(lock) spin_unlock(lock)
-+
-+#define spin_unlock_irqrestore(lock, flags) \
-+ do { \
-+ typecheck(unsigned long, flags); \
-+ (void) flags; \
-+ spin_unlock(lock); \
-+ } while (0)
-+
-+#define spin_trylock_bh(lock) __cond_lock(lock, rt_spin_trylock_bh(lock))
-+#define spin_trylock_irq(lock) spin_trylock(lock)
-+
-+#define spin_trylock_irqsave(lock, flags) \
-+ rt_spin_trylock_irqsave(lock, &(flags))
-+
-+#define spin_unlock_wait(lock) rt_spin_unlock_wait(lock)
-+
-+#ifdef CONFIG_GENERIC_LOCKBREAK
-+# define spin_is_contended(lock) ((lock)->break_lock)
-+#else
-+# define spin_is_contended(lock) (((void)(lock), 0))
-+#endif
-+
-+static inline int spin_can_lock(spinlock_t *lock)
-+{
-+ return !rt_mutex_is_locked(&lock->lock);
-+}
-+
-+static inline int spin_is_locked(spinlock_t *lock)
-+{
-+ return rt_mutex_is_locked(&lock->lock);
-+}
-+
-+static inline void assert_spin_locked(spinlock_t *lock)
-+{
-+ BUG_ON(!spin_is_locked(lock));
-+}
-+
-+#define atomic_dec_and_lock(atomic, lock) \
-+ atomic_dec_and_spin_lock(atomic, lock)
-+
-+#endif
-Index: linux-stable/kernel/locking/rt.c
-===================================================================
---- /dev/null
-+++ linux-stable/kernel/locking/rt.c
-@@ -0,0 +1,437 @@
-+/*
-+ * kernel/rt.c
-+ *
-+ * Real-Time Preemption Support
-+ *
-+ * started by Ingo Molnar:
-+ *
-+ * Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
-+ * Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
-+ *
-+ * historic credit for proving that Linux spinlocks can be implemented via
-+ * RT-aware mutexes goes to many people: The Pmutex project (Dirk Grambow
-+ * and others) who prototyped it on 2.4 and did lots of comparative
-+ * research and analysis; TimeSys, for proving that you can implement a
-+ * fully preemptible kernel via the use of IRQ threading and mutexes;
-+ * Bill Huey for persuasively arguing on lkml that the mutex model is the
-+ * right one; and to MontaVista, who ported pmutexes to 2.6.
-+ *
-+ * This code is a from-scratch implementation and is not based on pmutexes,
-+ * but the idea of converting spinlocks to mutexes is used here too.
-+ *
-+ * lock debugging, locking tree, deadlock detection:
-+ *
-+ * Copyright (C) 2004, LynuxWorks, Inc., Igor Manyilov, Bill Huey
-+ * Released under the General Public License (GPL).
-+ *
-+ * Includes portions of the generic R/W semaphore implementation from:
-+ *
-+ * Copyright (c) 2001 David Howells (dhowells@redhat.com).
-+ * - Derived partially from idea by Andrea Arcangeli <andrea@suse.de>
-+ * - Derived also from comments by Linus
-+ *
-+ * Pending ownership of locks and ownership stealing:
-+ *
-+ * Copyright (C) 2005, Kihon Technologies Inc., Steven Rostedt
-+ *
-+ * (also by Steven Rostedt)
-+ * - Converted single pi_lock to individual task locks.
-+ *
-+ * By Esben Nielsen:
-+ * Doing priority inheritance with help of the scheduler.
-+ *
-+ * Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
-+ * - major rework based on Esben Nielsens initial patch
-+ * - replaced thread_info references by task_struct refs
-+ * - removed task->pending_owner dependency
-+ * - BKL drop/reacquire for semaphore style locks to avoid deadlocks
-+ * in the scheduler return path as discussed with Steven Rostedt
-+ *
-+ * Copyright (C) 2006, Kihon Technologies Inc.
-+ * Steven Rostedt <rostedt@goodmis.org>
-+ * - debugged and patched Thomas Gleixner's rework.
-+ * - added back the cmpxchg to the rework.
-+ * - turned atomic require back on for SMP.
-+ */
-+
-+#include <linux/spinlock.h>
-+#include <linux/rtmutex.h>
-+#include <linux/sched.h>
-+#include <linux/delay.h>
-+#include <linux/module.h>
-+#include <linux/kallsyms.h>
-+#include <linux/syscalls.h>
-+#include <linux/interrupt.h>
-+#include <linux/plist.h>
-+#include <linux/fs.h>
-+#include <linux/futex.h>
-+#include <linux/hrtimer.h>
-+
-+#include "rtmutex_common.h"
-+
-+/*
-+ * struct mutex functions
-+ */
-+void __mutex_do_init(struct mutex *mutex, const char *name,
-+ struct lock_class_key *key)
-+{
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+ /*
-+ * Make sure we are not reinitializing a held lock:
-+ */
-+ debug_check_no_locks_freed((void *)mutex, sizeof(*mutex));
-+ lockdep_init_map(&mutex->dep_map, name, key, 0);
-+#endif
-+ mutex->lock.save_state = 0;
-+}
-+EXPORT_SYMBOL(__mutex_do_init);
-+
-+void __lockfunc _mutex_lock(struct mutex *lock)
-+{
-+ mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_);
-+ rt_mutex_lock(&lock->lock);
-+}
-+EXPORT_SYMBOL(_mutex_lock);
-+
-+int __lockfunc _mutex_lock_interruptible(struct mutex *lock)
-+{
-+ int ret;
-+
-+ mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_);
-+ ret = rt_mutex_lock_interruptible(&lock->lock, 0);
-+ if (ret)
-+ mutex_release(&lock->dep_map, 1, _RET_IP_);
-+ return ret;
-+}
-+EXPORT_SYMBOL(_mutex_lock_interruptible);
-+
-+int __lockfunc _mutex_lock_killable(struct mutex *lock)
-+{
-+ int ret;
-+
-+ mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_);
-+ ret = rt_mutex_lock_killable(&lock->lock, 0);
-+ if (ret)
-+ mutex_release(&lock->dep_map, 1, _RET_IP_);
-+ return ret;
-+}
-+EXPORT_SYMBOL(_mutex_lock_killable);
-+
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+void __lockfunc _mutex_lock_nested(struct mutex *lock, int subclass)
-+{
-+ mutex_acquire_nest(&lock->dep_map, subclass, 0, NULL, _RET_IP_);
-+ rt_mutex_lock(&lock->lock);
-+}
-+EXPORT_SYMBOL(_mutex_lock_nested);
-+
-+void __lockfunc _mutex_lock_nest_lock(struct mutex *lock, struct lockdep_map *nest)
-+{
-+ mutex_acquire_nest(&lock->dep_map, 0, 0, nest, _RET_IP_);
-+ rt_mutex_lock(&lock->lock);
-+}
-+EXPORT_SYMBOL(_mutex_lock_nest_lock);
-+
-+int __lockfunc _mutex_lock_interruptible_nested(struct mutex *lock, int subclass)
-+{
-+ int ret;
-+
-+ mutex_acquire_nest(&lock->dep_map, subclass, 0, NULL, _RET_IP_);
-+ ret = rt_mutex_lock_interruptible(&lock->lock, 0);
-+ if (ret)
-+ mutex_release(&lock->dep_map, 1, _RET_IP_);
-+ return ret;
-+}
-+EXPORT_SYMBOL(_mutex_lock_interruptible_nested);
-+
-+int __lockfunc _mutex_lock_killable_nested(struct mutex *lock, int subclass)
-+{
-+ int ret;
-+
-+ mutex_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
-+ ret = rt_mutex_lock_killable(&lock->lock, 0);
-+ if (ret)
-+ mutex_release(&lock->dep_map, 1, _RET_IP_);
-+ return ret;
-+}
-+EXPORT_SYMBOL(_mutex_lock_killable_nested);
-+#endif
-+
-+int __lockfunc _mutex_trylock(struct mutex *lock)
-+{
-+ int ret = rt_mutex_trylock(&lock->lock);
-+
-+ if (ret)
-+ mutex_acquire(&lock->dep_map, 0, 1, _RET_IP_);
-+
-+ return ret;
-+}
-+EXPORT_SYMBOL(_mutex_trylock);
-+
-+void __lockfunc _mutex_unlock(struct mutex *lock)
-+{
-+ mutex_release(&lock->dep_map, 1, _RET_IP_);
-+ rt_mutex_unlock(&lock->lock);
-+}
-+EXPORT_SYMBOL(_mutex_unlock);
-+
-+/*
-+ * rwlock_t functions
-+ */
-+int __lockfunc rt_write_trylock(rwlock_t *rwlock)
-+{
-+ int ret;
-+
-+ migrate_disable();
-+ ret = rt_mutex_trylock(&rwlock->lock);
-+ if (ret)
-+ rwlock_acquire(&rwlock->dep_map, 0, 1, _RET_IP_);
-+ else
-+ migrate_enable();
-+
-+ return ret;
-+}
-+EXPORT_SYMBOL(rt_write_trylock);
-+
-+int __lockfunc rt_write_trylock_irqsave(rwlock_t *rwlock, unsigned long *flags)
-+{
-+ int ret;
-+
-+ *flags = 0;
-+ ret = rt_write_trylock(rwlock);
-+ return ret;
-+}
-+EXPORT_SYMBOL(rt_write_trylock_irqsave);
-+
-+int __lockfunc rt_read_trylock(rwlock_t *rwlock)
-+{
-+ struct rt_mutex *lock = &rwlock->lock;
-+ int ret = 1;
-+
-+ /*
-+ * recursive read locks succeed when current owns the lock,
-+ * but not when read_depth == 0 which means that the lock is
-+ * write locked.
-+ */
-+ if (rt_mutex_owner(lock) != current) {
-+ migrate_disable();
-+ ret = rt_mutex_trylock(lock);
-+ if (ret)
-+ rwlock_acquire(&rwlock->dep_map, 0, 1, _RET_IP_);
-+ else
-+ migrate_enable();
-+
-+ } else if (!rwlock->read_depth) {
-+ ret = 0;
-+ }
-+
-+ if (ret)
-+ rwlock->read_depth++;
-+
-+ return ret;
-+}
-+EXPORT_SYMBOL(rt_read_trylock);
-+
-+void __lockfunc rt_write_lock(rwlock_t *rwlock)
-+{
-+ rwlock_acquire(&rwlock->dep_map, 0, 0, _RET_IP_);
-+ migrate_disable();
-+ __rt_spin_lock(&rwlock->lock);
-+}
-+EXPORT_SYMBOL(rt_write_lock);
-+
-+void __lockfunc rt_read_lock(rwlock_t *rwlock)
-+{
-+ struct rt_mutex *lock = &rwlock->lock;
-+
-+
-+ /*
-+ * recursive read locks succeed when current owns the lock
-+ */
-+ if (rt_mutex_owner(lock) != current) {
-+ migrate_disable();
-+ rwlock_acquire(&rwlock->dep_map, 0, 0, _RET_IP_);
-+ __rt_spin_lock(lock);
-+ }
-+ rwlock->read_depth++;
-+}
-+
-+EXPORT_SYMBOL(rt_read_lock);
-+
-+void __lockfunc rt_write_unlock(rwlock_t *rwlock)
-+{
-+ /* NOTE: we always pass in '1' for nested, for simplicity */
-+ rwlock_release(&rwlock->dep_map, 1, _RET_IP_);
-+ __rt_spin_unlock(&rwlock->lock);
-+ migrate_enable();
-+}
-+EXPORT_SYMBOL(rt_write_unlock);
-+
-+void __lockfunc rt_read_unlock(rwlock_t *rwlock)
-+{
-+ /* Release the lock only when read_depth is down to 0 */
-+ if (--rwlock->read_depth == 0) {
-+ rwlock_release(&rwlock->dep_map, 1, _RET_IP_);
-+ __rt_spin_unlock(&rwlock->lock);
-+ migrate_enable();
-+ }
-+}
-+EXPORT_SYMBOL(rt_read_unlock);
-+
-+unsigned long __lockfunc rt_write_lock_irqsave(rwlock_t *rwlock)
-+{
-+ rt_write_lock(rwlock);
-+
-+ return 0;
-+}
-+EXPORT_SYMBOL(rt_write_lock_irqsave);
-+
-+unsigned long __lockfunc rt_read_lock_irqsave(rwlock_t *rwlock)
-+{
-+ rt_read_lock(rwlock);
-+
-+ return 0;
-+}
-+EXPORT_SYMBOL(rt_read_lock_irqsave);
-+
-+void __rt_rwlock_init(rwlock_t *rwlock, char *name, struct lock_class_key *key)
-+{
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+ /*
-+ * Make sure we are not reinitializing a held lock:
-+ */
-+ debug_check_no_locks_freed((void *)rwlock, sizeof(*rwlock));
-+ lockdep_init_map(&rwlock->dep_map, name, key, 0);
-+#endif
-+ rwlock->lock.save_state = 1;
-+ rwlock->read_depth = 0;
-+}
-+EXPORT_SYMBOL(__rt_rwlock_init);
-+
-+/*
-+ * rw_semaphores
-+ */
-+
-+void rt_up_write(struct rw_semaphore *rwsem)
-+{
-+ rwsem_release(&rwsem->dep_map, 1, _RET_IP_);
-+ rt_mutex_unlock(&rwsem->lock);
-+}
-+EXPORT_SYMBOL(rt_up_write);
-+
-+void rt_up_read(struct rw_semaphore *rwsem)
-+{
-+ rwsem_release(&rwsem->dep_map, 1, _RET_IP_);
-+ rt_mutex_unlock(&rwsem->lock);
-+}
-+EXPORT_SYMBOL(rt_up_read);
-+
-+/*
-+ * downgrade a write lock into a read lock
-+ * - just wake up any readers at the front of the queue
-+ */
-+void rt_downgrade_write(struct rw_semaphore *rwsem)
-+{
-+ BUG_ON(rt_mutex_owner(&rwsem->lock) != current);
-+}
-+EXPORT_SYMBOL(rt_downgrade_write);
-+
-+int rt_down_write_trylock(struct rw_semaphore *rwsem)
-+{
-+ int ret = rt_mutex_trylock(&rwsem->lock);
-+
-+ if (ret)
-+ rwsem_acquire(&rwsem->dep_map, 0, 1, _RET_IP_);
-+ return ret;
-+}
-+EXPORT_SYMBOL(rt_down_write_trylock);
-+
-+void rt_down_write(struct rw_semaphore *rwsem)
-+{
-+ rwsem_acquire(&rwsem->dep_map, 0, 0, _RET_IP_);
-+ rt_mutex_lock(&rwsem->lock);
-+}
-+EXPORT_SYMBOL(rt_down_write);
-+
-+void rt_down_write_nested(struct rw_semaphore *rwsem, int subclass)
-+{
-+ rwsem_acquire(&rwsem->dep_map, subclass, 0, _RET_IP_);
-+ rt_mutex_lock(&rwsem->lock);
-+}
-+EXPORT_SYMBOL(rt_down_write_nested);
-+
-+void rt_down_write_nested_lock(struct rw_semaphore *rwsem,
-+ struct lockdep_map *nest)
-+{
-+ rwsem_acquire_nest(&rwsem->dep_map, 0, 0, nest, _RET_IP_);
-+ rt_mutex_lock(&rwsem->lock);
-+}
-+EXPORT_SYMBOL(rt_down_write_nested_lock);
-+
-+int rt_down_read_trylock(struct rw_semaphore *rwsem)
-+{
-+ int ret;
-+
-+ ret = rt_mutex_trylock(&rwsem->lock);
-+ if (ret)
-+ rwsem_acquire(&rwsem->dep_map, 0, 1, _RET_IP_);
-+
-+ return ret;
-+}
-+EXPORT_SYMBOL(rt_down_read_trylock);
-+
-+static void __rt_down_read(struct rw_semaphore *rwsem, int subclass)
-+{
-+ rwsem_acquire(&rwsem->dep_map, subclass, 0, _RET_IP_);
-+ rt_mutex_lock(&rwsem->lock);
-+}
-+
-+void rt_down_read(struct rw_semaphore *rwsem)
-+{
-+ __rt_down_read(rwsem, 0);
-+}
-+EXPORT_SYMBOL(rt_down_read);
-+
-+void rt_down_read_nested(struct rw_semaphore *rwsem, int subclass)
-+{
-+ __rt_down_read(rwsem, subclass);
-+}
-+EXPORT_SYMBOL(rt_down_read_nested);
-+
-+void __rt_rwsem_init(struct rw_semaphore *rwsem, const char *name,
-+ struct lock_class_key *key)
-+{
-+#ifdef CONFIG_DEBUG_LOCK_ALLOC
-+ /*
-+ * Make sure we are not reinitializing a held lock:
-+ */
-+ debug_check_no_locks_freed((void *)rwsem, sizeof(*rwsem));
-+ lockdep_init_map(&rwsem->dep_map, name, key, 0);
-+#endif
-+ rwsem->lock.save_state = 0;
-+}
-+EXPORT_SYMBOL(__rt_rwsem_init);
-+
-+/**
-+ * atomic_dec_and_mutex_lock - return holding mutex if we dec to 0
-+ * @cnt: the atomic which we are to dec
-+ * @lock: the mutex to return holding if we dec to 0
-+ *
-+ * return true and hold lock if we dec to 0, return false otherwise
-+ */
-+int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock)
-+{
-+ /* dec if we can't possibly hit 0 */
-+ if (atomic_add_unless(cnt, -1, 1))
-+ return 0;
-+ /* we might hit 0, so take the lock */
-+ mutex_lock(lock);
-+ if (!atomic_dec_and_test(cnt)) {
-+ /* when we actually did the dec, we didn't hit 0 */
-+ mutex_unlock(lock);
-+ return 0;
-+ }
-+ /* we hit 0, and we hold the lock */
-+ return 1;
-+}
-+EXPORT_SYMBOL(atomic_dec_and_mutex_lock);
-Index: linux-stable/kernel/locking/spinlock.c
-===================================================================
---- linux-stable.orig/kernel/locking/spinlock.c
-+++ linux-stable/kernel/locking/spinlock.c
-@@ -124,8 +124,11 @@ void __lockfunc __raw_##op##_lock_bh(loc
- * __[spin|read|write]_lock_bh()
- */
- BUILD_LOCK_OPS(spin, raw_spinlock);
-+
-+#ifndef CONFIG_PREEMPT_RT_FULL
- BUILD_LOCK_OPS(read, rwlock);
- BUILD_LOCK_OPS(write, rwlock);
-+#endif
-
- #endif
-
-@@ -209,6 +212,8 @@ void __lockfunc _raw_spin_unlock_bh(raw_
- EXPORT_SYMBOL(_raw_spin_unlock_bh);
- #endif
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+
- #ifndef CONFIG_INLINE_READ_TRYLOCK
- int __lockfunc _raw_read_trylock(rwlock_t *lock)
- {
-@@ -353,6 +358,8 @@ void __lockfunc _raw_write_unlock_bh(rwl
- EXPORT_SYMBOL(_raw_write_unlock_bh);
- #endif
-
-+#endif /* !PREEMPT_RT_FULL */
-+
- #ifdef CONFIG_DEBUG_LOCK_ALLOC
-
- void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
-Index: linux-stable/kernel/locking/spinlock_debug.c
-===================================================================
---- linux-stable.orig/kernel/locking/spinlock_debug.c
-+++ linux-stable/kernel/locking/spinlock_debug.c
-@@ -31,6 +31,7 @@ void __raw_spin_lock_init(raw_spinlock_t
-
- EXPORT_SYMBOL(__raw_spin_lock_init);
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- void __rwlock_init(rwlock_t *lock, const char *name,
- struct lock_class_key *key)
- {
-@@ -48,6 +49,7 @@ void __rwlock_init(rwlock_t *lock, const
- }
-
- EXPORT_SYMBOL(__rwlock_init);
-+#endif
-
- static void spin_dump(raw_spinlock_t *lock, const char *msg)
- {
-@@ -159,6 +161,7 @@ void do_raw_spin_unlock(raw_spinlock_t *
- arch_spin_unlock(&lock->raw_lock);
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- static void rwlock_bug(rwlock_t *lock, const char *msg)
- {
- if (!debug_locks_off())
-@@ -300,3 +303,5 @@ void do_raw_write_unlock(rwlock_t *lock)
- debug_write_unlock(lock);
- arch_write_unlock(&lock->raw_lock);
- }
-+
-+#endif
-Index: linux-stable/kernel/locking/percpu-rwsem.c
-===================================================================
---- linux-stable.orig/kernel/locking/percpu-rwsem.c
-+++ linux-stable/kernel/locking/percpu-rwsem.c
-@@ -84,8 +84,12 @@ void percpu_down_read(struct percpu_rw_s
-
- down_read(&brw->rw_sem);
- atomic_inc(&brw->slow_read_ctr);
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ up_read(&brw->rw_sem);
-+#else
- /* avoid up_read()->rwsem_release() */
- __up_read(&brw->rw_sem);
-+#endif
- }
-
- void percpu_up_read(struct percpu_rw_semaphore *brw)
-Index: linux-stable/kernel/rcu/tree_plugin.h
-===================================================================
---- linux-stable.orig/kernel/rcu/tree_plugin.h
-+++ linux-stable/kernel/rcu/tree_plugin.h
-@@ -24,12 +24,6 @@
- * Paul E. McKenney <paulmck@linux.vnet.ibm.com>
- */
-
--#include <linux/delay.h>
--#include <linux/gfp.h>
--#include <linux/oom.h>
--#include <linux/smpboot.h>
--#include "../time/tick-internal.h"
--
- #define RCU_KTHREAD_PRIO 1
-
- #ifdef CONFIG_RCU_BOOST
-@@ -370,7 +364,7 @@ void rcu_read_unlock_special(struct task
- }
-
- /* Hardware IRQ handlers cannot block, complain if they get here. */
-- if (WARN_ON_ONCE(in_irq() || in_serving_softirq())) {
-+ if (WARN_ON_ONCE(preempt_count() & (HARDIRQ_MASK | SOFTIRQ_OFFSET))) {
- local_irq_restore(flags);
- return;
- }
-@@ -670,15 +664,6 @@ static void rcu_preempt_check_callbacks(
- t->rcu_read_unlock_special |= RCU_READ_UNLOCK_NEED_QS;
- }
-
--#ifdef CONFIG_RCU_BOOST
--
--static void rcu_preempt_do_callbacks(void)
--{
-- rcu_do_batch(&rcu_preempt_state, this_cpu_ptr(&rcu_preempt_data));
--}
--
--#endif /* #ifdef CONFIG_RCU_BOOST */
--
- /*
- * Queue a preemptible-RCU callback for invocation after a grace period.
- */
-@@ -1146,6 +1131,19 @@ void exit_rcu(void)
-
- #endif /* #else #ifdef CONFIG_TREE_PREEMPT_RCU */
-
-+/*
-+ * If boosting, set rcuc kthreads to realtime priority.
-+ */
-+static void rcu_cpu_kthread_setup(unsigned int cpu)
-+{
-+#ifdef CONFIG_RCU_BOOST
-+ struct sched_param sp;
-+
-+ sp.sched_priority = RCU_KTHREAD_PRIO;
-+ sched_setscheduler_nocheck(current, SCHED_FIFO, &sp);
-+#endif /* #ifdef CONFIG_RCU_BOOST */
-+}
-+
- #ifdef CONFIG_RCU_BOOST
-
- #include "../locking/rtmutex_common.h"
-@@ -1177,16 +1175,6 @@ static void rcu_initiate_boost_trace(str
-
- #endif /* #else #ifdef CONFIG_RCU_TRACE */
-
--static void rcu_wake_cond(struct task_struct *t, int status)
--{
-- /*
-- * If the thread is yielding, only wake it when this
-- * is invoked from idle
-- */
-- if (status != RCU_KTHREAD_YIELDING || is_idle_task(current))
-- wake_up_process(t);
--}
--
- /*
- * Carry out RCU priority boosting on the task indicated by ->exp_tasks
- * or ->boost_tasks, advancing the pointer to the next task in the
-@@ -1331,23 +1319,6 @@ static void rcu_initiate_boost(struct rc
- }
-
- /*
-- * Wake up the per-CPU kthread to invoke RCU callbacks.
-- */
--static void invoke_rcu_callbacks_kthread(void)
--{
-- unsigned long flags;
--
-- local_irq_save(flags);
-- __this_cpu_write(rcu_cpu_has_work, 1);
-- if (__this_cpu_read(rcu_cpu_kthread_task) != NULL &&
-- current != __this_cpu_read(rcu_cpu_kthread_task)) {
-- rcu_wake_cond(__this_cpu_read(rcu_cpu_kthread_task),
-- __this_cpu_read(rcu_cpu_kthread_status));
-- }
-- local_irq_restore(flags);
--}
--
--/*
- * Is the current CPU running the RCU-callbacks kthread?
- * Caller must have preemption disabled.
- */
-@@ -1402,67 +1373,6 @@ static int rcu_spawn_one_boost_kthread(s
- return 0;
- }
-
--static void rcu_kthread_do_work(void)
--{
-- rcu_do_batch(&rcu_sched_state, this_cpu_ptr(&rcu_sched_data));
-- rcu_do_batch(&rcu_bh_state, this_cpu_ptr(&rcu_bh_data));
-- rcu_preempt_do_callbacks();
--}
--
--static void rcu_cpu_kthread_setup(unsigned int cpu)
--{
-- struct sched_param sp;
--
-- sp.sched_priority = RCU_KTHREAD_PRIO;
-- sched_setscheduler_nocheck(current, SCHED_FIFO, &sp);
--}
--
--static void rcu_cpu_kthread_park(unsigned int cpu)
--{
-- per_cpu(rcu_cpu_kthread_status, cpu) = RCU_KTHREAD_OFFCPU;
--}
--
--static int rcu_cpu_kthread_should_run(unsigned int cpu)
--{
-- return __this_cpu_read(rcu_cpu_has_work);
--}
--
--/*
-- * Per-CPU kernel thread that invokes RCU callbacks. This replaces the
-- * RCU softirq used in flavors and configurations of RCU that do not
-- * support RCU priority boosting.
-- */
--static void rcu_cpu_kthread(unsigned int cpu)
--{
-- unsigned int *statusp = this_cpu_ptr(&rcu_cpu_kthread_status);
-- char work, *workp = this_cpu_ptr(&rcu_cpu_has_work);
-- int spincnt;
--
-- for (spincnt = 0; spincnt < 10; spincnt++) {
-- trace_rcu_utilization(TPS("Start CPU kthread@rcu_wait"));
-- local_bh_disable();
-- *statusp = RCU_KTHREAD_RUNNING;
-- this_cpu_inc(rcu_cpu_kthread_loops);
-- local_irq_disable();
-- work = *workp;
-- *workp = 0;
-- local_irq_enable();
-- if (work)
-- rcu_kthread_do_work();
-- local_bh_enable();
-- if (*workp == 0) {
-- trace_rcu_utilization(TPS("End CPU kthread@rcu_wait"));
-- *statusp = RCU_KTHREAD_WAITING;
-- return;
-- }
-- }
-- *statusp = RCU_KTHREAD_YIELDING;
-- trace_rcu_utilization(TPS("Start CPU kthread@rcu_yield"));
-- schedule_timeout_interruptible(2);
-- trace_rcu_utilization(TPS("End CPU kthread@rcu_yield"));
-- *statusp = RCU_KTHREAD_WAITING;
--}
--
- /*
- * Set the per-rcu_node kthread's affinity to cover all CPUs that are
- * served by the rcu_node in question. The CPU hotplug lock is still
-@@ -1496,27 +1406,14 @@ static void rcu_boost_kthread_setaffinit
- free_cpumask_var(cm);
- }
-
--static struct smp_hotplug_thread rcu_cpu_thread_spec = {
-- .store = &rcu_cpu_kthread_task,
-- .thread_should_run = rcu_cpu_kthread_should_run,
-- .thread_fn = rcu_cpu_kthread,
-- .thread_comm = "rcuc/%u",
-- .setup = rcu_cpu_kthread_setup,
-- .park = rcu_cpu_kthread_park,
--};
--
- /*
- * Spawn all kthreads -- called as soon as the scheduler is running.
- */
- static int __init rcu_spawn_kthreads(void)
- {
- struct rcu_node *rnp;
-- int cpu;
-
- rcu_scheduler_fully_active = 1;
-- for_each_possible_cpu(cpu)
-- per_cpu(rcu_cpu_has_work, cpu) = 0;
-- BUG_ON(smpboot_register_percpu_thread(&rcu_cpu_thread_spec));
- rnp = rcu_get_root(rcu_state);
- (void)rcu_spawn_one_boost_kthread(rcu_state, rnp);
- if (NUM_RCU_NODES > 1) {
-@@ -1544,11 +1441,6 @@ static void rcu_initiate_boost(struct rc
- raw_spin_unlock_irqrestore(&rnp->lock, flags);
- }
-
--static void invoke_rcu_callbacks_kthread(void)
--{
-- WARN_ON_ONCE(1);
--}
--
- static bool rcu_is_callbacks_kthread(void)
- {
- return false;
-@@ -1575,7 +1467,7 @@ static void rcu_prepare_kthreads(int cpu
-
- #endif /* #else #ifdef CONFIG_RCU_BOOST */
-
--#if !defined(CONFIG_RCU_FAST_NO_HZ)
-+#if !defined(CONFIG_RCU_FAST_NO_HZ) || defined(CONFIG_PREEMPT_RT_FULL)
-
- /*
- * Check to see if any future RCU-related work will need to be done
-@@ -1591,6 +1483,9 @@ int rcu_needs_cpu(int cpu, unsigned long
- *delta_jiffies = ULONG_MAX;
- return rcu_cpu_has_callbacks(cpu, NULL);
- }
-+#endif /* !defined(CONFIG_RCU_FAST_NO_HZ) || defined(CONFIG_PREEMPT_RT_FULL) */
-+
-+#if !defined(CONFIG_RCU_FAST_NO_HZ)
-
- /*
- * Because we do not have RCU_FAST_NO_HZ, don't bother cleaning up
-@@ -1688,6 +1583,8 @@ static bool rcu_try_advance_all_cbs(void
- return cbs_ready;
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+
- /*
- * Allow the CPU to enter dyntick-idle mode unless it has callbacks ready
- * to invoke. If the CPU has callbacks, try to advance them. Tell the
-@@ -1726,6 +1623,7 @@ int rcu_needs_cpu(int cpu, unsigned long
- }
- return 0;
- }
-+#endif /* #ifndef CONFIG_PREEMPT_RT_FULL */
-
- /*
- * Prepare a CPU for idle from an RCU perspective. The first major task
-@@ -2079,7 +1977,7 @@ static int rcu_nocb_needs_gp(struct rcu_
- */
- static void rcu_nocb_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp)
- {
-- wake_up_all(&rnp->nocb_gp_wq[rnp->completed & 0x1]);
-+ swait_wake_all(&rnp->nocb_gp_wq[rnp->completed & 0x1]);
- }
-
- /*
-@@ -2097,8 +1995,8 @@ static void rcu_nocb_gp_set(struct rcu_n
-
- static void rcu_init_one_nocb(struct rcu_node *rnp)
- {
-- init_waitqueue_head(&rnp->nocb_gp_wq[0]);
-- init_waitqueue_head(&rnp->nocb_gp_wq[1]);
-+ init_swait_head(&rnp->nocb_gp_wq[0]);
-+ init_swait_head(&rnp->nocb_gp_wq[1]);
- }
-
- /* Is the specified CPU a no-CPUs CPU? */
-@@ -2143,7 +2041,7 @@ static void __call_rcu_nocb_enqueue(stru
- len = atomic_long_read(&rdp->nocb_q_count);
- if (old_rhpp == &rdp->nocb_head) {
- if (!irqs_disabled_flags(flags)) {
-- wake_up(&rdp->nocb_wq); /* ... if queue was empty ... */
-+ swait_wake(&rdp->nocb_wq); /* ... if queue was empty ... */
- trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
- TPS("WakeEmpty"));
- } else {
-@@ -2247,7 +2145,7 @@ static void rcu_nocb_wait_gp(struct rcu_
- */
- trace_rcu_future_gp(rnp, rdp, c, TPS("StartWait"));
- for (;;) {
-- wait_event_interruptible(
-+ swait_event_interruptible(
- rnp->nocb_gp_wq[c & 0x1],
- (d = ULONG_CMP_GE(ACCESS_ONCE(rnp->completed), c)));
- if (likely(d))
-@@ -2278,7 +2176,7 @@ static int rcu_nocb_kthread(void *arg)
- if (!rcu_nocb_poll) {
- trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
- TPS("Sleep"));
-- wait_event_interruptible(rdp->nocb_wq, rdp->nocb_head);
-+ swait_event_interruptible(rdp->nocb_wq, rdp->nocb_head);
- /* Memory barrier provide by xchg() below. */
- } else if (firsttime) {
- firsttime = 0;
-@@ -2352,7 +2250,7 @@ static void do_nocb_deferred_wakeup(stru
- if (!rcu_nocb_need_deferred_wakeup(rdp))
- return;
- ACCESS_ONCE(rdp->nocb_defer_wakeup) = false;
-- wake_up(&rdp->nocb_wq);
-+ swait_wake(&rdp->nocb_wq);
- trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu, TPS("DeferredWakeEmpty"));
- }
-
-@@ -2360,7 +2258,7 @@ static void do_nocb_deferred_wakeup(stru
- static void __init rcu_boot_init_nocb_percpu_data(struct rcu_data *rdp)
- {
- rdp->nocb_tail = &rdp->nocb_head;
-- init_waitqueue_head(&rdp->nocb_wq);
-+ init_swait_head(&rdp->nocb_wq);
- }
-
- /* Create a kthread for each RCU flavor for each no-CBs CPU. */
-Index: linux-stable/include/linux/rcutree.h
-===================================================================
---- linux-stable.orig/include/linux/rcutree.h
-+++ linux-stable/include/linux/rcutree.h
-@@ -44,7 +44,11 @@ static inline void rcu_virt_note_context
- rcu_note_context_switch(cpu);
- }
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+# define synchronize_rcu_bh synchronize_rcu
-+#else
- void synchronize_rcu_bh(void);
-+#endif
- void synchronize_sched_expedited(void);
- void synchronize_rcu_expedited(void);
-
-@@ -72,17 +76,19 @@ static inline void synchronize_rcu_bh_ex
- }
-
- void rcu_barrier(void);
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+# define rcu_barrier_bh rcu_barrier
-+#else
- void rcu_barrier_bh(void);
-+#endif
- void rcu_barrier_sched(void);
-
- extern unsigned long rcutorture_testseq;
- extern unsigned long rcutorture_vernum;
- long rcu_batches_completed(void);
--long rcu_batches_completed_bh(void);
- long rcu_batches_completed_sched(void);
-
- void rcu_force_quiescent_state(void);
--void rcu_bh_force_quiescent_state(void);
- void rcu_sched_force_quiescent_state(void);
-
- void exit_rcu(void);
-@@ -92,4 +98,12 @@ extern int rcu_scheduler_active __read_m
-
- bool rcu_is_watching(void);
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+void rcu_bh_force_quiescent_state(void);
-+long rcu_batches_completed_bh(void);
-+#else
-+# define rcu_bh_force_quiescent_state rcu_force_quiescent_state
-+# define rcu_batches_completed_bh rcu_batches_completed
-+#endif
-+
- #endif /* __LINUX_RCUTREE_H */
-Index: linux-stable/kernel/rcu/tree.c
-===================================================================
---- linux-stable.orig/kernel/rcu/tree.c
-+++ linux-stable/kernel/rcu/tree.c
-@@ -56,6 +56,11 @@
- #include <linux/random.h>
- #include <linux/ftrace_event.h>
- #include <linux/suspend.h>
-+#include <linux/delay.h>
-+#include <linux/gfp.h>
-+#include <linux/oom.h>
-+#include <linux/smpboot.h>
-+#include "../time/tick-internal.h"
-
- #include "tree.h"
- #include <trace/events/rcu.h>
-@@ -145,8 +150,6 @@ EXPORT_SYMBOL_GPL(rcu_scheduler_active);
- */
- static int rcu_scheduler_fully_active __read_mostly;
-
--#ifdef CONFIG_RCU_BOOST
--
- /*
- * Control variables for per-CPU and per-rcu_node kthreads. These
- * handle all flavors of RCU.
-@@ -156,8 +159,6 @@ DEFINE_PER_CPU(unsigned int, rcu_cpu_kth
- DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_loops);
- DEFINE_PER_CPU(char, rcu_cpu_has_work);
-
--#endif /* #ifdef CONFIG_RCU_BOOST */
--
- static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu);
- static void invoke_rcu_core(void);
- static void invoke_rcu_callbacks(struct rcu_state *rsp, struct rcu_data *rdp);
-@@ -199,6 +200,19 @@ void rcu_sched_qs(int cpu)
- rdp->passed_quiesce = 1;
- }
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+static void rcu_preempt_qs(int cpu);
-+
-+void rcu_bh_qs(int cpu)
-+{
-+ unsigned long flags;
-+
-+ /* Callers to this function, rcu_preempt_qs(), must disable irqs. */
-+ local_irq_save(flags);
-+ rcu_preempt_qs(cpu);
-+ local_irq_restore(flags);
-+}
-+#else
- void rcu_bh_qs(int cpu)
- {
- struct rcu_data *rdp = &per_cpu(rcu_bh_data, cpu);
-@@ -207,6 +221,7 @@ void rcu_bh_qs(int cpu)
- trace_rcu_grace_period(TPS("rcu_bh"), rdp->gpnum, TPS("cpuqs"));
- rdp->passed_quiesce = 1;
- }
-+#endif
-
- /*
- * Note a context switch. This is a quiescent state for RCU-sched,
-@@ -263,6 +278,7 @@ long rcu_batches_completed_sched(void)
- }
- EXPORT_SYMBOL_GPL(rcu_batches_completed_sched);
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * Return the number of RCU BH batches processed thus far for debug & stats.
- */
-@@ -280,6 +296,7 @@ void rcu_bh_force_quiescent_state(void)
- force_quiescent_state(&rcu_bh_state);
- }
- EXPORT_SYMBOL_GPL(rcu_bh_force_quiescent_state);
-+#endif
-
- /*
- * Record the number of times rcutorture tests have been initiated and
-@@ -1593,7 +1610,7 @@ static int __noreturn rcu_gp_kthread(voi
- trace_rcu_grace_period(rsp->name,
- ACCESS_ONCE(rsp->gpnum),
- TPS("reqwait"));
-- wait_event_interruptible(rsp->gp_wq,
-+ swait_event_interruptible(rsp->gp_wq,
- ACCESS_ONCE(rsp->gp_flags) &
- RCU_GP_FLAG_INIT);
- /* Locking provides needed memory barrier. */
-@@ -1620,7 +1637,7 @@ static int __noreturn rcu_gp_kthread(voi
- trace_rcu_grace_period(rsp->name,
- ACCESS_ONCE(rsp->gpnum),
- TPS("fqswait"));
-- ret = wait_event_interruptible_timeout(rsp->gp_wq,
-+ ret = swait_event_interruptible_timeout(rsp->gp_wq,
- ((gf = ACCESS_ONCE(rsp->gp_flags)) &
- RCU_GP_FLAG_FQS) ||
- (!ACCESS_ONCE(rnp->qsmask) &&
-@@ -1670,7 +1687,7 @@ static void rsp_wakeup(struct irq_work *
- struct rcu_state *rsp = container_of(work, struct rcu_state, wakeup_work);
-
- /* Wake up rcu_gp_kthread() to start the grace period. */
-- wake_up(&rsp->gp_wq);
-+ swait_wake(&rsp->gp_wq);
- }
-
- /*
-@@ -1746,7 +1763,7 @@ static void rcu_report_qs_rsp(struct rcu
- {
- WARN_ON_ONCE(!rcu_gp_in_progress(rsp));
- raw_spin_unlock_irqrestore(&rcu_get_root(rsp)->lock, flags);
-- wake_up(&rsp->gp_wq); /* Memory barrier implied by wake_up() path. */
-+ swait_wake(&rsp->gp_wq); /* Memory barrier implied by wake_up() path. */
- }
-
- /*
-@@ -2322,7 +2339,8 @@ static void force_quiescent_state(struct
- }
- rsp->gp_flags |= RCU_GP_FLAG_FQS;
- raw_spin_unlock_irqrestore(&rnp_old->lock, flags);
-- wake_up(&rsp->gp_wq); /* Memory barrier implied by wake_up() path. */
-+ /* Memory barrier implied by wake_up() path. */
-+ swait_wake(&rsp->gp_wq);
- }
-
- /*
-@@ -2362,16 +2380,14 @@ __rcu_process_callbacks(struct rcu_state
- /*
- * Do RCU core processing for the current CPU.
- */
--static void rcu_process_callbacks(struct softirq_action *unused)
-+static void rcu_process_callbacks(void)
- {
- struct rcu_state *rsp;
-
- if (cpu_is_offline(smp_processor_id()))
- return;
-- trace_rcu_utilization(TPS("Start RCU core"));
- for_each_rcu_flavor(rsp)
- __rcu_process_callbacks(rsp);
-- trace_rcu_utilization(TPS("End RCU core"));
- }
-
- /*
-@@ -2385,18 +2401,105 @@ static void invoke_rcu_callbacks(struct
- {
- if (unlikely(!ACCESS_ONCE(rcu_scheduler_fully_active)))
- return;
-- if (likely(!rsp->boost)) {
-- rcu_do_batch(rsp, rdp);
-+ rcu_do_batch(rsp, rdp);
-+}
-+
-+static void rcu_wake_cond(struct task_struct *t, int status)
-+{
-+ /*
-+ * If the thread is yielding, only wake it when this
-+ * is invoked from idle
-+ */
-+ if (t && (status != RCU_KTHREAD_YIELDING || is_idle_task(current)))
-+ wake_up_process(t);
-+}
-+
-+/*
-+ * Wake up this CPU's rcuc kthread to do RCU core processing.
-+ */
-+static void invoke_rcu_core(void)
-+{
-+ unsigned long flags;
-+ struct task_struct *t;
-+
-+ if (!cpu_online(smp_processor_id()))
- return;
-+ local_irq_save(flags);
-+ __this_cpu_write(rcu_cpu_has_work, 1);
-+ t = __this_cpu_read(rcu_cpu_kthread_task);
-+ if (t != NULL && current != t)
-+ rcu_wake_cond(t, __this_cpu_read(rcu_cpu_kthread_status));
-+ local_irq_restore(flags);
-+}
-+
-+static void rcu_cpu_kthread_park(unsigned int cpu)
-+{
-+ per_cpu(rcu_cpu_kthread_status, cpu) = RCU_KTHREAD_OFFCPU;
-+}
-+
-+static int rcu_cpu_kthread_should_run(unsigned int cpu)
-+{
-+ return __this_cpu_read(rcu_cpu_has_work);
-+}
-+
-+/*
-+ * Per-CPU kernel thread that invokes RCU callbacks. This replaces the
-+ * RCU softirq used in flavors and configurations of RCU that do not
-+ * support RCU priority boosting.
-+ */
-+static void rcu_cpu_kthread(unsigned int cpu)
-+{
-+ unsigned int *statusp = &__get_cpu_var(rcu_cpu_kthread_status);
-+ char work, *workp = &__get_cpu_var(rcu_cpu_has_work);
-+ int spincnt;
-+
-+ for (spincnt = 0; spincnt < 10; spincnt++) {
-+ trace_rcu_utilization(TPS("Start CPU kthread@rcu_wait"));
-+ local_bh_disable();
-+ *statusp = RCU_KTHREAD_RUNNING;
-+ this_cpu_inc(rcu_cpu_kthread_loops);
-+ local_irq_disable();
-+ work = *workp;
-+ *workp = 0;
-+ local_irq_enable();
-+ if (work)
-+ rcu_process_callbacks();
-+ local_bh_enable();
-+ if (*workp == 0) {
-+ trace_rcu_utilization(TPS("End CPU kthread@rcu_wait"));
-+ *statusp = RCU_KTHREAD_WAITING;
-+ return;
-+ }
- }
-- invoke_rcu_callbacks_kthread();
-+ *statusp = RCU_KTHREAD_YIELDING;
-+ trace_rcu_utilization(TPS("Start CPU kthread@rcu_yield"));
-+ schedule_timeout_interruptible(2);
-+ trace_rcu_utilization(TPS("End CPU kthread@rcu_yield"));
-+ *statusp = RCU_KTHREAD_WAITING;
- }
-
--static void invoke_rcu_core(void)
-+static struct smp_hotplug_thread rcu_cpu_thread_spec = {
-+ .store = &rcu_cpu_kthread_task,
-+ .thread_should_run = rcu_cpu_kthread_should_run,
-+ .thread_fn = rcu_cpu_kthread,
-+ .thread_comm = "rcuc/%u",
-+ .setup = rcu_cpu_kthread_setup,
-+ .park = rcu_cpu_kthread_park,
-+};
-+
-+/*
-+ * Spawn per-CPU RCU core processing kthreads.
-+ */
-+static int __init rcu_spawn_core_kthreads(void)
- {
-- if (cpu_online(smp_processor_id()))
-- raise_softirq(RCU_SOFTIRQ);
-+ int cpu;
-+
-+ for_each_possible_cpu(cpu)
-+ per_cpu(rcu_cpu_has_work, cpu) = 0;
-+ BUG_ON(smpboot_register_percpu_thread(&rcu_cpu_thread_spec));
-+ return 0;
- }
-+early_initcall(rcu_spawn_core_kthreads);
-
- /*
- * Handle any core-RCU processing required by a call_rcu() invocation.
-@@ -2527,6 +2630,7 @@ void call_rcu_sched(struct rcu_head *hea
- }
- EXPORT_SYMBOL_GPL(call_rcu_sched);
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * Queue an RCU callback for invocation after a quicker grace period.
- */
-@@ -2535,6 +2639,7 @@ void call_rcu_bh(struct rcu_head *head,
- __call_rcu(head, func, &rcu_bh_state, -1, 0);
- }
- EXPORT_SYMBOL_GPL(call_rcu_bh);
-+#endif
-
- /*
- * Because a context switch is a grace period for RCU-sched and RCU-bh,
-@@ -2612,6 +2717,7 @@ void synchronize_sched(void)
- }
- EXPORT_SYMBOL_GPL(synchronize_sched);
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- /**
- * synchronize_rcu_bh - wait until an rcu_bh grace period has elapsed.
- *
-@@ -2638,6 +2744,7 @@ void synchronize_rcu_bh(void)
- wait_rcu_gp(call_rcu_bh);
- }
- EXPORT_SYMBOL_GPL(synchronize_rcu_bh);
-+#endif
-
- static int synchronize_sched_expedited_cpu_stop(void *data)
- {
-@@ -3058,6 +3165,7 @@ static void _rcu_barrier(struct rcu_stat
- mutex_unlock(&rsp->barrier_mutex);
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- /**
- * rcu_barrier_bh - Wait until all in-flight call_rcu_bh() callbacks complete.
- */
-@@ -3066,6 +3174,7 @@ void rcu_barrier_bh(void)
- _rcu_barrier(&rcu_bh_state);
- }
- EXPORT_SYMBOL_GPL(rcu_barrier_bh);
-+#endif
-
- /**
- * rcu_barrier_sched - Wait for in-flight call_rcu_sched() callbacks.
-@@ -3369,7 +3478,7 @@ static void __init rcu_init_one(struct r
- }
-
- rsp->rda = rda;
-- init_waitqueue_head(&rsp->gp_wq);
-+ init_swait_head(&rsp->gp_wq);
- init_irq_work(&rsp->wakeup_work, rsp_wakeup);
- rnp = rsp->level[rcu_num_lvls - 1];
- for_each_possible_cpu(i) {
-@@ -3467,7 +3576,6 @@ void __init rcu_init(void)
- rcu_init_one(&rcu_bh_state, &rcu_bh_data);
- rcu_init_one(&rcu_sched_state, &rcu_sched_data);
- __rcu_init_preempt();
-- open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
-
- /*
- * We don't need protection against CPU-hotplug here because
-Index: linux-stable/kernel/rcu/update.c
-===================================================================
---- linux-stable.orig/kernel/rcu/update.c
-+++ linux-stable/kernel/rcu/update.c
-@@ -140,6 +140,7 @@ int notrace debug_lockdep_rcu_enabled(vo
- }
- EXPORT_SYMBOL_GPL(debug_lockdep_rcu_enabled);
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- /**
- * rcu_read_lock_bh_held() - might we be in RCU-bh read-side critical section?
- *
-@@ -166,6 +167,7 @@ int rcu_read_lock_bh_held(void)
- return in_softirq() || irqs_disabled();
- }
- EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held);
-+#endif
-
- #endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
-
-Index: linux-stable/kernel/rcu/tiny.c
-===================================================================
---- linux-stable.orig/kernel/rcu/tiny.c
-+++ linux-stable/kernel/rcu/tiny.c
-@@ -372,6 +372,7 @@ void call_rcu_sched(struct rcu_head *hea
- }
- EXPORT_SYMBOL_GPL(call_rcu_sched);
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * Post an RCU bottom-half callback to be invoked after any subsequent
- * quiescent state.
-@@ -381,6 +382,7 @@ void call_rcu_bh(struct rcu_head *head,
- __call_rcu(head, func, &rcu_bh_ctrlblk);
- }
- EXPORT_SYMBOL_GPL(call_rcu_bh);
-+#endif
-
- void rcu_init(void)
- {
-Index: linux-stable/include/linux/lglock.h
-===================================================================
---- linux-stable.orig/include/linux/lglock.h
-+++ linux-stable/include/linux/lglock.h
-@@ -32,22 +32,39 @@
- #endif
-
- struct lglock {
-+#ifndef CONFIG_PREEMPT_RT_FULL
- arch_spinlock_t __percpu *lock;
-+#else
-+ struct rt_mutex __percpu *lock;
-+#endif
- #ifdef CONFIG_DEBUG_LOCK_ALLOC
- struct lock_class_key lock_key;
- struct lockdep_map lock_dep_map;
- #endif
- };
-
--#define DEFINE_LGLOCK(name) \
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+# define DEFINE_LGLOCK(name) \
- static DEFINE_PER_CPU(arch_spinlock_t, name ## _lock) \
- = __ARCH_SPIN_LOCK_UNLOCKED; \
- struct lglock name = { .lock = &name ## _lock }
-
--#define DEFINE_STATIC_LGLOCK(name) \
-+# define DEFINE_STATIC_LGLOCK(name) \
- static DEFINE_PER_CPU(arch_spinlock_t, name ## _lock) \
- = __ARCH_SPIN_LOCK_UNLOCKED; \
- static struct lglock name = { .lock = &name ## _lock }
-+#else
-+
-+# define DEFINE_LGLOCK(name) \
-+ static DEFINE_PER_CPU(struct rt_mutex, name ## _lock) \
-+ = __RT_MUTEX_INITIALIZER( name ## _lock); \
-+ struct lglock name = { .lock = &name ## _lock }
-+
-+# define DEFINE_STATIC_LGLOCK(name) \
-+ static DEFINE_PER_CPU(struct rt_mutex, name ## _lock) \
-+ = __RT_MUTEX_INITIALIZER( name ## _lock); \
-+ static struct lglock name = { .lock = &name ## _lock }
-+#endif
-
- void lg_lock_init(struct lglock *lg, char *name);
- void lg_local_lock(struct lglock *lg);
-@@ -57,4 +74,10 @@ void lg_local_unlock_cpu(struct lglock *
- void lg_global_lock(struct lglock *lg);
- void lg_global_unlock(struct lglock *lg);
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+#define lg_global_trylock_relax(name) lg_global_lock(name)
-+#else
-+void lg_global_trylock_relax(struct lglock *lg);
-+#endif
-+
- #endif
-Index: linux-stable/kernel/locking/lglock.c
-===================================================================
---- linux-stable.orig/kernel/locking/lglock.c
-+++ linux-stable/kernel/locking/lglock.c
-@@ -4,6 +4,15 @@
- #include <linux/cpu.h>
- #include <linux/string.h>
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+# define lg_lock_ptr arch_spinlock_t
-+# define lg_do_lock(l) arch_spin_lock(l)
-+# define lg_do_unlock(l) arch_spin_unlock(l)
-+#else
-+# define lg_lock_ptr struct rt_mutex
-+# define lg_do_lock(l) __rt_spin_lock(l)
-+# define lg_do_unlock(l) __rt_spin_unlock(l)
-+#endif
- /*
- * Note there is no uninit, so lglocks cannot be defined in
- * modules (but it's fine to use them from there)
-@@ -12,51 +21,60 @@
-
- void lg_lock_init(struct lglock *lg, char *name)
- {
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ int i;
-+
-+ for_each_possible_cpu(i) {
-+ struct rt_mutex *lock = per_cpu_ptr(lg->lock, i);
-+
-+ rt_mutex_init(lock);
-+ }
-+#endif
- LOCKDEP_INIT_MAP(&lg->lock_dep_map, name, &lg->lock_key, 0);
- }
- EXPORT_SYMBOL(lg_lock_init);
-
- void lg_local_lock(struct lglock *lg)
- {
-- arch_spinlock_t *lock;
-+ lg_lock_ptr *lock;
-
-- preempt_disable();
-+ migrate_disable();
- lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
- lock = this_cpu_ptr(lg->lock);
-- arch_spin_lock(lock);
-+ lg_do_lock(lock);
- }
- EXPORT_SYMBOL(lg_local_lock);
-
- void lg_local_unlock(struct lglock *lg)
- {
-- arch_spinlock_t *lock;
-+ lg_lock_ptr *lock;
-
- lock_release(&lg->lock_dep_map, 1, _RET_IP_);
- lock = this_cpu_ptr(lg->lock);
-- arch_spin_unlock(lock);
-- preempt_enable();
-+ lg_do_unlock(lock);
-+ migrate_enable();
- }
- EXPORT_SYMBOL(lg_local_unlock);
-
- void lg_local_lock_cpu(struct lglock *lg, int cpu)
- {
-- arch_spinlock_t *lock;
-+ lg_lock_ptr *lock;
-
-- preempt_disable();
-+ preempt_disable_nort();
- lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
- lock = per_cpu_ptr(lg->lock, cpu);
-- arch_spin_lock(lock);
-+ lg_do_lock(lock);
- }
- EXPORT_SYMBOL(lg_local_lock_cpu);
-
- void lg_local_unlock_cpu(struct lglock *lg, int cpu)
- {
-- arch_spinlock_t *lock;
-+ lg_lock_ptr *lock;
-
- lock_release(&lg->lock_dep_map, 1, _RET_IP_);
- lock = per_cpu_ptr(lg->lock, cpu);
-- arch_spin_unlock(lock);
-- preempt_enable();
-+ lg_do_unlock(lock);
-+ preempt_enable_nort();
- }
- EXPORT_SYMBOL(lg_local_unlock_cpu);
-
-@@ -64,12 +82,12 @@ void lg_global_lock(struct lglock *lg)
- {
- int i;
-
-- preempt_disable();
-+ preempt_disable_nort();
- lock_acquire_exclusive(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
- for_each_possible_cpu(i) {
-- arch_spinlock_t *lock;
-+ lg_lock_ptr *lock;
- lock = per_cpu_ptr(lg->lock, i);
-- arch_spin_lock(lock);
-+ lg_do_lock(lock);
- }
- }
- EXPORT_SYMBOL(lg_global_lock);
-@@ -80,10 +98,35 @@ void lg_global_unlock(struct lglock *lg)
-
- lock_release(&lg->lock_dep_map, 1, _RET_IP_);
- for_each_possible_cpu(i) {
-- arch_spinlock_t *lock;
-+ lg_lock_ptr *lock;
- lock = per_cpu_ptr(lg->lock, i);
-- arch_spin_unlock(lock);
-+ lg_do_unlock(lock);
- }
-- preempt_enable();
-+ preempt_enable_nort();
- }
- EXPORT_SYMBOL(lg_global_unlock);
-+
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+/*
-+ * HACK: If you use this, you get to keep the pieces.
-+ * Used in queue_stop_cpus_work() when stop machinery
-+ * is called from inactive CPU, so we can't schedule.
-+ */
-+# define lg_do_trylock_relax(l) \
-+ do { \
-+ while (!__rt_spin_trylock(l)) \
-+ cpu_relax(); \
-+ } while (0)
-+
-+void lg_global_trylock_relax(struct lglock *lg)
-+{
-+ int i;
-+
-+ lock_acquire_exclusive(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
-+ for_each_possible_cpu(i) {
-+ lg_lock_ptr *lock;
-+ lock = per_cpu_ptr(lg->lock, i);
-+ lg_do_trylock_relax(lock);
-+ }
-+}
-+#endif
-Index: linux-stable/drivers/tty/serial/8250/8250_core.c
-===================================================================
---- linux-stable.orig/drivers/tty/serial/8250/8250_core.c
-+++ linux-stable/drivers/tty/serial/8250/8250_core.c
-@@ -38,6 +38,7 @@
- #include <linux/nmi.h>
- #include <linux/mutex.h>
- #include <linux/slab.h>
-+#include <linux/kdb.h>
- #ifdef CONFIG_SPARC
- #include <linux/sunserialcore.h>
- #endif
-@@ -80,7 +81,16 @@ static unsigned int skip_txen_test; /* f
- #define DEBUG_INTR(fmt...) do { } while (0)
- #endif
-
--#define PASS_LIMIT 512
-+/*
-+ * On -rt we can have a more delays, and legitimately
-+ * so - so don't drop work spuriously and spam the
-+ * syslog:
-+ */
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+# define PASS_LIMIT 1000000
-+#else
-+# define PASS_LIMIT 512
-+#endif
-
- #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
-
-@@ -2882,14 +2892,10 @@ serial8250_console_write(struct console
-
- touch_nmi_watchdog();
-
-- local_irq_save(flags);
-- if (port->sysrq) {
-- /* serial8250_handle_irq() already took the lock */
-- locked = 0;
-- } else if (oops_in_progress) {
-- locked = spin_trylock(&port->lock);
-- } else
-- spin_lock(&port->lock);
-+ if (port->sysrq || oops_in_progress || in_kdb_printk())
-+ locked = spin_trylock_irqsave(&port->lock, flags);
-+ else
-+ spin_lock_irqsave(&port->lock, flags);
-
- /*
- * First save the IER then disable the interrupts
-@@ -2921,8 +2927,7 @@ serial8250_console_write(struct console
- serial8250_modem_status(up);
-
- if (locked)
-- spin_unlock(&port->lock);
-- local_irq_restore(flags);
-+ spin_unlock_irqrestore(&port->lock, flags);
- }
-
- static int __init serial8250_console_setup(struct console *co, char *options)
-Index: linux-stable/drivers/tty/serial/omap-serial.c
-===================================================================
---- linux-stable.orig/drivers/tty/serial/omap-serial.c
-+++ linux-stable/drivers/tty/serial/omap-serial.c
-@@ -1271,13 +1271,10 @@ serial_omap_console_write(struct console
-
- pm_runtime_get_sync(up->dev);
-
-- local_irq_save(flags);
-- if (up->port.sysrq)
-- locked = 0;
-- else if (oops_in_progress)
-- locked = spin_trylock(&up->port.lock);
-+ if (up->port.sysrq || oops_in_progress)
-+ locked = spin_trylock_irqsave(&up->port.lock, flags);
- else
-- spin_lock(&up->port.lock);
-+ spin_lock_irqsave(&up->port.lock, flags);
-
- /*
- * First save the IER then disable the interrupts
-@@ -1306,8 +1303,7 @@ serial_omap_console_write(struct console
- pm_runtime_mark_last_busy(up->dev);
- pm_runtime_put_autosuspend(up->dev);
- if (locked)
-- spin_unlock(&up->port.lock);
-- local_irq_restore(flags);
-+ spin_unlock_irqrestore(&up->port.lock, flags);
- }
-
- static int __init
-Index: linux-stable/drivers/tty/serial/amba-pl011.c
-===================================================================
---- linux-stable.orig/drivers/tty/serial/amba-pl011.c
-+++ linux-stable/drivers/tty/serial/amba-pl011.c
-@@ -1919,13 +1919,19 @@ pl011_console_write(struct console *co,
-
- clk_enable(uap->clk);
-
-- local_irq_save(flags);
-+ /*
-+ * local_irq_save(flags);
-+ *
-+ * This local_irq_save() is nonsense. If we come in via sysrq
-+ * handling then interrupts are already disabled. Aside of
-+ * that the port.sysrq check is racy on SMP regardless.
-+ */
- if (uap->port.sysrq)
- locked = 0;
- else if (oops_in_progress)
-- locked = spin_trylock(&uap->port.lock);
-+ locked = spin_trylock_irqsave(&uap->port.lock, flags);
- else
-- spin_lock(&uap->port.lock);
-+ spin_lock_irqsave(&uap->port.lock, flags);
-
- /*
- * First save the CR then disable the interrupts
-@@ -1947,8 +1953,7 @@ pl011_console_write(struct console *co,
- writew(old_cr, uap->port.membase + UART011_CR);
-
- if (locked)
-- spin_unlock(&uap->port.lock);
-- local_irq_restore(flags);
-+ spin_unlock_irqrestore(&uap->port.lock, flags);
-
- clk_disable(uap->clk);
- }
-Index: linux-stable/fs/namespace.c
-===================================================================
---- linux-stable.orig/fs/namespace.c
-+++ linux-stable/fs/namespace.c
-@@ -14,6 +14,7 @@
- #include <linux/mnt_namespace.h>
- #include <linux/user_namespace.h>
- #include <linux/namei.h>
-+#include <linux/delay.h>
- #include <linux/security.h>
- #include <linux/idr.h>
- #include <linux/acct.h> /* acct_auto_close_mnt */
-@@ -343,8 +344,11 @@ int __mnt_want_write(struct vfsmount *m)
- * incremented count after it has set MNT_WRITE_HOLD.
- */
- smp_mb();
-- while (ACCESS_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD)
-- cpu_relax();
-+ while (ACCESS_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD) {
-+ preempt_enable();
-+ cpu_chill();
-+ preempt_disable();
-+ }
- /*
- * After the slowpath clears MNT_WRITE_HOLD, mnt_is_readonly will
- * be set to match its requirements. So we must not load that until
-Index: linux-stable/fs/exec.c
-===================================================================
---- linux-stable.orig/fs/exec.c
-+++ linux-stable/fs/exec.c
-@@ -842,10 +842,12 @@ static int exec_mmap(struct mm_struct *m
- }
- }
- task_lock(tsk);
-+ preempt_disable_rt();
- active_mm = tsk->active_mm;
- tsk->mm = mm;
- tsk->active_mm = mm;
- activate_mm(active_mm, mm);
-+ preempt_enable_rt();
- task_unlock(tsk);
- if (old_mm) {
- up_read(&old_mm->mmap_sem);
-Index: linux-stable/mm/mmu_context.c
-===================================================================
---- linux-stable.orig/mm/mmu_context.c
-+++ linux-stable/mm/mmu_context.c
-@@ -23,6 +23,7 @@ void use_mm(struct mm_struct *mm)
- struct task_struct *tsk = current;
-
- task_lock(tsk);
-+ preempt_disable_rt();
- active_mm = tsk->active_mm;
- if (active_mm != mm) {
- atomic_inc(&mm->mm_count);
-@@ -30,6 +31,7 @@ void use_mm(struct mm_struct *mm)
- }
- tsk->mm = mm;
- switch_mm(active_mm, mm, tsk);
-+ preempt_enable_rt();
- task_unlock(tsk);
-
- if (active_mm != mm)
-Index: linux-stable/fs/jbd/checkpoint.c
-===================================================================
---- linux-stable.orig/fs/jbd/checkpoint.c
-+++ linux-stable/fs/jbd/checkpoint.c
-@@ -129,6 +129,8 @@ void __log_wait_for_space(journal_t *jou
- if (journal->j_flags & JFS_ABORT)
- return;
- spin_unlock(&journal->j_state_lock);
-+ if (current->plug)
-+ io_schedule();
- mutex_lock(&journal->j_checkpoint_mutex);
-
- /*
-Index: linux-stable/fs/jbd2/checkpoint.c
-===================================================================
---- linux-stable.orig/fs/jbd2/checkpoint.c
-+++ linux-stable/fs/jbd2/checkpoint.c
-@@ -125,6 +125,8 @@ void __jbd2_log_wait_for_space(journal_t
- if (journal->j_flags & JBD2_ABORT)
- return;
- write_unlock(&journal->j_state_lock);
-+ if (current->plug)
-+ io_schedule();
- mutex_lock(&journal->j_checkpoint_mutex);
-
- /*
-Index: linux-stable/arch/x86/kernel/cpu/mcheck/mce.c
-===================================================================
---- linux-stable.orig/arch/x86/kernel/cpu/mcheck/mce.c
-+++ linux-stable/arch/x86/kernel/cpu/mcheck/mce.c
-@@ -18,6 +18,7 @@
- #include <linux/rcupdate.h>
- #include <linux/kobject.h>
- #include <linux/uaccess.h>
-+#include <linux/kthread.h>
- #include <linux/kdebug.h>
- #include <linux/kernel.h>
- #include <linux/percpu.h>
-@@ -41,6 +42,7 @@
- #include <linux/debugfs.h>
- #include <linux/irq_work.h>
- #include <linux/export.h>
-+#include <linux/jiffies.h>
-
- #include <asm/processor.h>
- #include <asm/mce.h>
-@@ -1268,7 +1270,7 @@ void mce_log_therm_throt_event(__u64 sta
- static unsigned long check_interval = 5 * 60; /* 5 minutes */
-
- static DEFINE_PER_CPU(unsigned long, mce_next_interval); /* in jiffies */
--static DEFINE_PER_CPU(struct timer_list, mce_timer);
-+static DEFINE_PER_CPU(struct hrtimer, mce_timer);
-
- static unsigned long mce_adjust_timer_default(unsigned long interval)
- {
-@@ -1278,13 +1280,10 @@ static unsigned long mce_adjust_timer_de
- static unsigned long (*mce_adjust_timer)(unsigned long interval) =
- mce_adjust_timer_default;
-
--static void mce_timer_fn(unsigned long data)
-+static enum hrtimer_restart mce_timer_fn(struct hrtimer *timer)
- {
-- struct timer_list *t = &__get_cpu_var(mce_timer);
- unsigned long iv;
-
-- WARN_ON(smp_processor_id() != data);
--
- if (mce_available(__this_cpu_ptr(&cpu_info))) {
- machine_check_poll(MCP_TIMESTAMP,
- &__get_cpu_var(mce_poll_banks));
-@@ -1305,9 +1304,11 @@ static void mce_timer_fn(unsigned long d
- __this_cpu_write(mce_next_interval, iv);
- /* Might have become 0 after CMCI storm subsided */
- if (iv) {
-- t->expires = jiffies + iv;
-- add_timer_on(t, smp_processor_id());
-+ hrtimer_forward_now(timer, ns_to_ktime(
-+ jiffies_to_usecs(iv) * 1000ULL));
-+ return HRTIMER_RESTART;
- }
-+ return HRTIMER_NORESTART;
- }
-
- /*
-@@ -1315,28 +1316,37 @@ static void mce_timer_fn(unsigned long d
- */
- void mce_timer_kick(unsigned long interval)
- {
-- struct timer_list *t = &__get_cpu_var(mce_timer);
-- unsigned long when = jiffies + interval;
-+ struct hrtimer *t = &__get_cpu_var(mce_timer);
- unsigned long iv = __this_cpu_read(mce_next_interval);
-
-- if (timer_pending(t)) {
-- if (time_before(when, t->expires))
-- mod_timer_pinned(t, when);
-+ if (hrtimer_active(t)) {
-+ s64 exp;
-+ s64 intv_us;
-+
-+ intv_us = jiffies_to_usecs(interval);
-+ exp = ktime_to_us(hrtimer_expires_remaining(t));
-+ if (intv_us < exp) {
-+ hrtimer_cancel(t);
-+ hrtimer_start_range_ns(t,
-+ ns_to_ktime(intv_us * 1000),
-+ 0, HRTIMER_MODE_REL_PINNED);
-+ }
- } else {
-- t->expires = round_jiffies(when);
-- add_timer_on(t, smp_processor_id());
-+ hrtimer_start_range_ns(t,
-+ ns_to_ktime(jiffies_to_usecs(interval) * 1000ULL),
-+ 0, HRTIMER_MODE_REL_PINNED);
- }
- if (interval < iv)
- __this_cpu_write(mce_next_interval, interval);
- }
-
--/* Must not be called in IRQ context where del_timer_sync() can deadlock */
-+/* Must not be called in IRQ context where hrtimer_cancel() can deadlock */
- static void mce_timer_delete_all(void)
- {
- int cpu;
-
- for_each_online_cpu(cpu)
-- del_timer_sync(&per_cpu(mce_timer, cpu));
-+ hrtimer_cancel(&per_cpu(mce_timer, cpu));
- }
-
- static void mce_do_trigger(struct work_struct *work)
-@@ -1346,6 +1356,63 @@ static void mce_do_trigger(struct work_s
-
- static DECLARE_WORK(mce_trigger_work, mce_do_trigger);
-
-+static void __mce_notify_work(void)
-+{
-+ /* Not more than two messages every minute */
-+ static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2);
-+
-+ /* wake processes polling /dev/mcelog */
-+ wake_up_interruptible(&mce_chrdev_wait);
-+
-+ /*
-+ * There is no risk of missing notifications because
-+ * work_pending is always cleared before the function is
-+ * executed.
-+ */
-+ if (mce_helper[0] && !work_pending(&mce_trigger_work))
-+ schedule_work(&mce_trigger_work);
-+
-+ if (__ratelimit(&ratelimit))
-+ pr_info(HW_ERR "Machine check events logged\n");
-+}
-+
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+struct task_struct *mce_notify_helper;
-+
-+static int mce_notify_helper_thread(void *unused)
-+{
-+ while (1) {
-+ set_current_state(TASK_INTERRUPTIBLE);
-+ schedule();
-+ if (kthread_should_stop())
-+ break;
-+ __mce_notify_work();
-+ }
-+ return 0;
-+}
-+
-+static int mce_notify_work_init(void)
-+{
-+ mce_notify_helper = kthread_run(mce_notify_helper_thread, NULL,
-+ "mce-notify");
-+ if (!mce_notify_helper)
-+ return -ENOMEM;
-+
-+ return 0;
-+}
-+
-+static void mce_notify_work(void)
-+{
-+ wake_up_process(mce_notify_helper);
-+}
-+#else
-+static void mce_notify_work(void)
-+{
-+ __mce_notify_work();
-+}
-+static inline int mce_notify_work_init(void) { return 0; }
-+#endif
-+
- /*
- * Notify the user(s) about new machine check events.
- * Can be called from interrupt context, but not from machine check/NMI
-@@ -1353,19 +1420,8 @@ static DECLARE_WORK(mce_trigger_work, mc
- */
- int mce_notify_irq(void)
- {
-- /* Not more than two messages every minute */
-- static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2);
--
- if (test_and_clear_bit(0, &mce_need_notify)) {
-- /* wake processes polling /dev/mcelog */
-- wake_up_interruptible(&mce_chrdev_wait);
--
-- if (mce_helper[0])
-- schedule_work(&mce_trigger_work);
--
-- if (__ratelimit(&ratelimit))
-- pr_info(HW_ERR "Machine check events logged\n");
--
-+ mce_notify_work();
- return 1;
- }
- return 0;
-@@ -1636,7 +1692,7 @@ static void __mcheck_cpu_init_vendor(str
- }
- }
-
--static void mce_start_timer(unsigned int cpu, struct timer_list *t)
-+static void mce_start_timer(unsigned int cpu, struct hrtimer *t)
- {
- unsigned long iv = check_interval * HZ;
-
-@@ -1645,16 +1701,17 @@ static void mce_start_timer(unsigned int
-
- per_cpu(mce_next_interval, cpu) = iv;
-
-- t->expires = round_jiffies(jiffies + iv);
-- add_timer_on(t, cpu);
-+ hrtimer_start_range_ns(t, ns_to_ktime(jiffies_to_usecs(iv) * 1000ULL),
-+ 0, HRTIMER_MODE_REL_PINNED);
- }
-
- static void __mcheck_cpu_init_timer(void)
- {
-- struct timer_list *t = &__get_cpu_var(mce_timer);
-+ struct hrtimer *t = &__get_cpu_var(mce_timer);
- unsigned int cpu = smp_processor_id();
-
-- setup_timer(t, mce_timer_fn, cpu);
-+ hrtimer_init(t, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
-+ t->function = mce_timer_fn;
- mce_start_timer(cpu, t);
- }
-
-@@ -2331,6 +2388,8 @@ static void mce_disable_cpu(void *h)
- if (!mce_available(__this_cpu_ptr(&cpu_info)))
- return;
-
-+ hrtimer_cancel(&__get_cpu_var(mce_timer));
-+
- if (!(action & CPU_TASKS_FROZEN))
- cmci_clear();
- for (i = 0; i < mca_cfg.banks; i++) {
-@@ -2357,6 +2416,7 @@ static void mce_reenable_cpu(void *h)
- if (b->init)
- wrmsrl(MSR_IA32_MCx_CTL(i), b->ctl);
- }
-+ __mcheck_cpu_init_timer();
- }
-
- /* Get notified when a cpu comes on/off. Be hotplug friendly. */
-@@ -2364,7 +2424,6 @@ static int
- mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
- {
- unsigned int cpu = (unsigned long)hcpu;
-- struct timer_list *t = &per_cpu(mce_timer, cpu);
-
- switch (action & ~CPU_TASKS_FROZEN) {
- case CPU_ONLINE:
-@@ -2380,11 +2439,9 @@ mce_cpu_callback(struct notifier_block *
- break;
- case CPU_DOWN_PREPARE:
- smp_call_function_single(cpu, mce_disable_cpu, &action, 1);
-- del_timer_sync(t);
- break;
- case CPU_DOWN_FAILED:
- smp_call_function_single(cpu, mce_reenable_cpu, &action, 1);
-- mce_start_timer(cpu, t);
- break;
- }
-
-@@ -2446,6 +2503,8 @@ static __init int mcheck_init_device(voi
- /* register character device /dev/mcelog */
- misc_register(&mce_chrdev_device);
-
-+ err = mce_notify_work_init();
-+
- return err;
- }
- device_initcall_sync(mcheck_init_device);
-Index: linux-stable/arch/x86/include/asm/stackprotector.h
-===================================================================
---- linux-stable.orig/arch/x86/include/asm/stackprotector.h
-+++ linux-stable/arch/x86/include/asm/stackprotector.h
-@@ -57,7 +57,7 @@
- */
- static __always_inline void boot_init_stack_canary(void)
- {
-- u64 canary;
-+ u64 uninitialized_var(canary);
- u64 tsc;
-
- #ifdef CONFIG_X86_64
-@@ -68,8 +68,16 @@ static __always_inline void boot_init_st
- * of randomness. The TSC only matters for very early init,
- * there it already has some randomness on most systems. Later
- * on during the bootup the random pool has true entropy too.
-+ *
-+ * For preempt-rt we need to weaken the randomness a bit, as
-+ * we can't call into the random generator from atomic context
-+ * due to locking constraints. We just leave canary
-+ * uninitialized and use the TSC based randomness on top of
-+ * it.
- */
-+#ifndef CONFIG_PREEMPT_RT_FULL
- get_random_bytes(&canary, sizeof(canary));
-+#endif
- tsc = __native_read_tsc();
- canary += tsc + (tsc << 32UL);
-
-Index: linux-stable/arch/x86/Kconfig
-===================================================================
---- linux-stable.orig/arch/x86/Kconfig
-+++ linux-stable/arch/x86/Kconfig
-@@ -21,6 +21,7 @@ config X86_64
- ### Arch settings
- config X86
- def_bool y
-+ select HAVE_PREEMPT_LAZY if X86_32
- select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
- select ARCH_MIGHT_HAVE_PC_PARPORT
- select ARCH_MIGHT_HAVE_PC_SERIO
-@@ -183,8 +184,11 @@ config ARCH_MAY_HAVE_PC_FDC
- def_bool y
- depends on ISA_DMA_API
-
-+config RWSEM_GENERIC_SPINLOCK
-+ def_bool PREEMPT_RT_FULL
-+
- config RWSEM_XCHGADD_ALGORITHM
-- def_bool y
-+ def_bool !RWSEM_GENERIC_SPINLOCK && !PREEMPT_RT_FULL
-
- config GENERIC_CALIBRATE_DELAY
- def_bool y
-@@ -808,7 +812,7 @@ config IOMMU_HELPER
- config MAXSMP
- bool "Enable Maximum number of SMP Processors and NUMA Nodes"
- depends on X86_64 && SMP && DEBUG_KERNEL
-- select CPUMASK_OFFSTACK
-+ select CPUMASK_OFFSTACK if !PREEMPT_RT_FULL
- ---help---
- Enable maximum number of CPUS and NUMA Nodes for this architecture.
- If unsure, say N.
-Index: linux-stable/fs/eventpoll.c
-===================================================================
---- linux-stable.orig/fs/eventpoll.c
-+++ linux-stable/fs/eventpoll.c
-@@ -505,12 +505,12 @@ static int ep_poll_wakeup_proc(void *pri
- */
- static void ep_poll_safewake(wait_queue_head_t *wq)
- {
-- int this_cpu = get_cpu();
-+ int this_cpu = get_cpu_light();
-
- ep_call_nested(&poll_safewake_ncalls, EP_MAX_NESTS,
- ep_poll_wakeup_proc, NULL, wq, (void *) (long) this_cpu);
-
-- put_cpu();
-+ put_cpu_light();
- }
-
- static void ep_remove_wait_queue(struct eppoll_entry *pwq)
-Index: linux-stable/mm/vmalloc.c
-===================================================================
---- linux-stable.orig/mm/vmalloc.c
-+++ linux-stable/mm/vmalloc.c
-@@ -796,7 +796,7 @@ static struct vmap_block *new_vmap_block
- struct vmap_block *vb;
- struct vmap_area *va;
- unsigned long vb_idx;
-- int node, err;
-+ int node, err, cpu;
-
- node = numa_node_id();
-
-@@ -834,11 +834,12 @@ static struct vmap_block *new_vmap_block
- BUG_ON(err);
- radix_tree_preload_end();
-
-- vbq = &get_cpu_var(vmap_block_queue);
-+ cpu = get_cpu_light();
-+ vbq = &__get_cpu_var(vmap_block_queue);
- spin_lock(&vbq->lock);
- list_add_rcu(&vb->free_list, &vbq->free);
- spin_unlock(&vbq->lock);
-- put_cpu_var(vmap_block_queue);
-+ put_cpu_light();
-
- return vb;
- }
-@@ -906,6 +907,7 @@ static void *vb_alloc(unsigned long size
- struct vmap_block *vb;
- unsigned long addr = 0;
- unsigned int order;
-+ int cpu = 0;
-
- BUG_ON(size & ~PAGE_MASK);
- BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);
-@@ -921,7 +923,8 @@ static void *vb_alloc(unsigned long size
-
- again:
- rcu_read_lock();
-- vbq = &get_cpu_var(vmap_block_queue);
-+ cpu = get_cpu_light();
-+ vbq = &__get_cpu_var(vmap_block_queue);
- list_for_each_entry_rcu(vb, &vbq->free, free_list) {
- int i;
-
-@@ -945,7 +948,7 @@ next:
- spin_unlock(&vb->lock);
- }
-
-- put_cpu_var(vmap_block_queue);
-+ put_cpu_light();
- rcu_read_unlock();
-
- if (!addr) {
-Index: linux-stable/block/blk-mq.c
-===================================================================
---- linux-stable.orig/block/blk-mq.c
-+++ linux-stable/block/blk-mq.c
-@@ -30,7 +30,11 @@ static void __blk_mq_run_hw_queue(struct
- static struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
- unsigned int cpu)
- {
-- return per_cpu_ptr(q->queue_ctx, cpu);
-+ struct blk_mq_ctx *ctx;
-+
-+ ctx = per_cpu_ptr(q->queue_ctx, cpu);
-+ spin_lock(&ctx->cpu_lock);
-+ return ctx;
- }
-
- /*
-@@ -41,12 +45,18 @@ static struct blk_mq_ctx *__blk_mq_get_c
- */
- static struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
- {
-- return __blk_mq_get_ctx(q, get_cpu());
-+ return __blk_mq_get_ctx(q, get_cpu_light());
-+}
-+
-+static void __blk_mq_put_ctx(struct blk_mq_ctx *ctx)
-+{
-+ spin_unlock(&ctx->cpu_lock);
- }
-
- static void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
- {
-- put_cpu();
-+ __blk_mq_put_ctx(ctx);
-+ put_cpu_light();
- }
-
- /*
-@@ -897,7 +907,9 @@ static void blk_mq_make_request(struct r
- if (list_empty(&plug->mq_list))
- trace_block_plug(q);
- else if (request_count >= BLK_MAX_REQUEST_COUNT) {
-+ spin_unlock(&ctx->cpu_lock);
- blk_flush_plug_list(plug, false);
-+ spin_lock(&ctx->cpu_lock);
- trace_block_plug(q);
- }
- list_add_tail(&rq->queuelist, &plug->mq_list);
-@@ -959,7 +971,7 @@ static void blk_mq_hctx_notify(void *dat
- struct blk_mq_ctx *ctx;
- LIST_HEAD(tmp);
-
-- if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
-+ if (action != CPU_POST_DEAD && action != CPU_POST_DEAD)
- return;
-
- /*
-@@ -973,6 +985,7 @@ static void blk_mq_hctx_notify(void *dat
- clear_bit(ctx->index_hw, hctx->ctx_map);
- }
- spin_unlock(&ctx->lock);
-+ __blk_mq_put_ctx(ctx);
-
- if (list_empty(&tmp))
- return;
-@@ -1212,6 +1225,7 @@ static void blk_mq_init_cpu_queues(struc
- memset(__ctx, 0, sizeof(*__ctx));
- __ctx->cpu = i;
- spin_lock_init(&__ctx->lock);
-+ spin_lock_init(&__ctx->cpu_lock);
- INIT_LIST_HEAD(&__ctx->rq_list);
- __ctx->queue = q;
-
-Index: linux-stable/block/blk-mq.h
-===================================================================
---- linux-stable.orig/block/blk-mq.h
-+++ linux-stable/block/blk-mq.h
-@@ -7,6 +7,7 @@ struct blk_mq_ctx {
- struct list_head rq_list;
- } ____cacheline_aligned_in_smp;
-
-+ spinlock_t cpu_lock;
- unsigned int cpu;
- unsigned int index_hw;
- unsigned int ipi_redirect;
-Index: linux-stable/include/linux/delay.h
-===================================================================
---- linux-stable.orig/include/linux/delay.h
-+++ linux-stable/include/linux/delay.h
-@@ -52,4 +52,10 @@ static inline void ssleep(unsigned int s
- msleep(seconds * 1000);
- }
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+extern void cpu_chill(void);
-+#else
-+# define cpu_chill() cpu_relax()
-+#endif
-+
- #endif /* defined(_LINUX_DELAY_H) */
-Index: linux-stable/block/blk-mq-cpu.c
-===================================================================
---- linux-stable.orig/block/blk-mq-cpu.c
-+++ linux-stable/block/blk-mq-cpu.c
-@@ -11,7 +11,7 @@
- #include "blk-mq.h"
-
- static LIST_HEAD(blk_mq_cpu_notify_list);
--static DEFINE_RAW_SPINLOCK(blk_mq_cpu_notify_lock);
-+static DEFINE_SPINLOCK(blk_mq_cpu_notify_lock);
-
- static int blk_mq_main_cpu_notify(struct notifier_block *self,
- unsigned long action, void *hcpu)
-@@ -19,12 +19,15 @@ static int blk_mq_main_cpu_notify(struct
- unsigned int cpu = (unsigned long) hcpu;
- struct blk_mq_cpu_notifier *notify;
-
-- raw_spin_lock(&blk_mq_cpu_notify_lock);
-+ if (action != CPU_POST_DEAD && action != CPU_POST_DEAD)
-+ return NOTIFY_OK;
-+
-+ spin_lock(&blk_mq_cpu_notify_lock);
-
- list_for_each_entry(notify, &blk_mq_cpu_notify_list, list)
- notify->notify(notify->data, action, cpu);
-
-- raw_spin_unlock(&blk_mq_cpu_notify_lock);
-+ spin_unlock(&blk_mq_cpu_notify_lock);
- return NOTIFY_OK;
- }
-
-@@ -32,16 +35,16 @@ void blk_mq_register_cpu_notifier(struct
- {
- BUG_ON(!notifier->notify);
-
-- raw_spin_lock(&blk_mq_cpu_notify_lock);
-+ spin_lock(&blk_mq_cpu_notify_lock);
- list_add_tail(&notifier->list, &blk_mq_cpu_notify_list);
-- raw_spin_unlock(&blk_mq_cpu_notify_lock);
-+ spin_unlock(&blk_mq_cpu_notify_lock);
- }
-
- void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
- {
-- raw_spin_lock(&blk_mq_cpu_notify_lock);
-+ spin_lock(&blk_mq_cpu_notify_lock);
- list_del(&notifier->list);
-- raw_spin_unlock(&blk_mq_cpu_notify_lock);
-+ spin_unlock(&blk_mq_cpu_notify_lock);
- }
-
- void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
-Index: linux-stable/block/blk-ioc.c
-===================================================================
---- linux-stable.orig/block/blk-ioc.c
-+++ linux-stable/block/blk-ioc.c
-@@ -7,6 +7,7 @@
- #include <linux/bio.h>
- #include <linux/blkdev.h>
- #include <linux/slab.h>
-+#include <linux/delay.h>
-
- #include "blk.h"
-
-@@ -109,7 +110,7 @@ static void ioc_release_fn(struct work_s
- spin_unlock(q->queue_lock);
- } else {
- spin_unlock_irqrestore(&ioc->lock, flags);
-- cpu_relax();
-+ cpu_chill();
- spin_lock_irqsave_nested(&ioc->lock, flags, 1);
- }
- }
-@@ -187,7 +188,7 @@ retry:
- spin_unlock(icq->q->queue_lock);
- } else {
- spin_unlock_irqrestore(&ioc->lock, flags);
-- cpu_relax();
-+ cpu_chill();
- goto retry;
- }
- }
-Index: linux-stable/fs/autofs4/autofs_i.h
-===================================================================
---- linux-stable.orig/fs/autofs4/autofs_i.h
-+++ linux-stable/fs/autofs4/autofs_i.h
-@@ -34,6 +34,7 @@
- #include <linux/sched.h>
- #include <linux/mount.h>
- #include <linux/namei.h>
-+#include <linux/delay.h>
- #include <asm/current.h>
- #include <asm/uaccess.h>
-
-Index: linux-stable/fs/autofs4/expire.c
-===================================================================
---- linux-stable.orig/fs/autofs4/expire.c
-+++ linux-stable/fs/autofs4/expire.c
-@@ -157,7 +157,7 @@ again:
- parent = p->d_parent;
- if (!spin_trylock(&parent->d_lock)) {
- spin_unlock(&p->d_lock);
-- cpu_relax();
-+ cpu_chill();
- goto relock;
- }
- spin_unlock(&p->d_lock);
-Index: linux-stable/fs/dcache.c
-===================================================================
---- linux-stable.orig/fs/dcache.c
-+++ linux-stable/fs/dcache.c
-@@ -19,6 +19,7 @@
- #include <linux/mm.h>
- #include <linux/fs.h>
- #include <linux/fsnotify.h>
-+#include <linux/delay.h>
- #include <linux/slab.h>
- #include <linux/init.h>
- #include <linux/hash.h>
-@@ -517,7 +518,7 @@ dentry_kill(struct dentry *dentry, int u
- relock:
- if (unlock_on_failure) {
- spin_unlock(&dentry->d_lock);
-- cpu_relax();
-+ cpu_chill();
- }
- return dentry; /* try again with same dentry */
- }
-@@ -2378,7 +2379,7 @@ again:
- if (dentry->d_lockref.count == 1) {
- if (!spin_trylock(&inode->i_lock)) {
- spin_unlock(&dentry->d_lock);
-- cpu_relax();
-+ cpu_chill();
- goto again;
- }
- dentry->d_flags &= ~DCACHE_CANT_MOUNT;
-Index: linux-stable/net/packet/af_packet.c
-===================================================================
---- linux-stable.orig/net/packet/af_packet.c
-+++ linux-stable/net/packet/af_packet.c
-@@ -63,6 +63,7 @@
- #include <linux/if_packet.h>
- #include <linux/wireless.h>
- #include <linux/kernel.h>
-+#include <linux/delay.h>
- #include <linux/kmod.h>
- #include <linux/slab.h>
- #include <linux/vmalloc.h>
-@@ -700,7 +701,7 @@ static void prb_retire_rx_blk_timer_expi
- if (BLOCK_NUM_PKTS(pbd)) {
- while (atomic_read(&pkc->blk_fill_in_prog)) {
- /* Waiting for skb_copy_bits to finish... */
-- cpu_relax();
-+ cpu_chill();
- }
- }
-
-@@ -951,7 +952,7 @@ static void prb_retire_current_block(str
- if (!(status & TP_STATUS_BLK_TMO)) {
- while (atomic_read(&pkc->blk_fill_in_prog)) {
- /* Waiting for skb_copy_bits to finish... */
-- cpu_relax();
-+ cpu_chill();
- }
- }
- prb_close_block(pkc, pbd, po, status);
-Index: linux-stable/net/rds/ib_rdma.c
-===================================================================
---- linux-stable.orig/net/rds/ib_rdma.c
-+++ linux-stable/net/rds/ib_rdma.c
-@@ -34,6 +34,7 @@
- #include <linux/slab.h>
- #include <linux/rculist.h>
- #include <linux/llist.h>
-+#include <linux/delay.h>
-
- #include "rds.h"
- #include "ib.h"
-@@ -286,7 +287,7 @@ static inline void wait_clean_list_grace
- for_each_online_cpu(cpu) {
- flag = &per_cpu(clean_list_grace, cpu);
- while (test_bit(CLEAN_LIST_BUSY_BIT, flag))
-- cpu_relax();
-+ cpu_chill();
- }
- }
-
-Index: linux-stable/kernel/workqueue.c
-===================================================================
---- linux-stable.orig/kernel/workqueue.c
-+++ linux-stable/kernel/workqueue.c
-@@ -48,6 +48,8 @@
- #include <linux/nodemask.h>
- #include <linux/moduleparam.h>
- #include <linux/uaccess.h>
-+#include <linux/locallock.h>
-+#include <linux/delay.h>
-
- #include "workqueue_internal.h"
-
-@@ -124,16 +126,21 @@ enum {
- * cpu or grabbing pool->lock is enough for read access. If
- * POOL_DISASSOCIATED is set, it's identical to L.
- *
-+ * On RT we need the extra protection via rt_lock_idle_list() for
-+ * the list manipulations against read access from
-+ * wq_worker_sleeping(). All other places are nicely serialized via
-+ * pool->lock.
-+ *
- * MG: pool->manager_mutex and pool->lock protected. Writes require both
- * locks. Reads can happen under either lock.
- *
- * PL: wq_pool_mutex protected.
- *
-- * PR: wq_pool_mutex protected for writes. Sched-RCU protected for reads.
-+ * PR: wq_pool_mutex protected for writes. RCU protected for reads.
- *
- * WQ: wq->mutex protected.
- *
-- * WR: wq->mutex protected for writes. Sched-RCU protected for reads.
-+ * WR: wq->mutex protected for writes. RCU protected for reads.
- *
- * MD: wq_mayday_lock protected.
- */
-@@ -178,7 +185,7 @@ struct worker_pool {
- atomic_t nr_running ____cacheline_aligned_in_smp;
-
- /*
-- * Destruction of pool is sched-RCU protected to allow dereferences
-+ * Destruction of pool is RCU protected to allow dereferences
- * from get_work_pool().
- */
- struct rcu_head rcu;
-@@ -207,7 +214,7 @@ struct pool_workqueue {
- /*
- * Release of unbound pwq is punted to system_wq. See put_pwq()
- * and pwq_unbound_release_workfn() for details. pool_workqueue
-- * itself is also sched-RCU protected so that the first pwq can be
-+ * itself is also RCU protected so that the first pwq can be
- * determined without grabbing wq->mutex.
- */
- struct work_struct unbound_release_work;
-@@ -323,6 +330,8 @@ EXPORT_SYMBOL_GPL(system_power_efficient
- struct workqueue_struct *system_freezable_power_efficient_wq __read_mostly;
- EXPORT_SYMBOL_GPL(system_freezable_power_efficient_wq);
-
-+static DEFINE_LOCAL_IRQ_LOCK(pendingb_lock);
-+
- static int worker_thread(void *__worker);
- static void copy_workqueue_attrs(struct workqueue_attrs *to,
- const struct workqueue_attrs *from);
-@@ -331,14 +340,14 @@ static void copy_workqueue_attrs(struct
- #include <trace/events/workqueue.h>
-
- #define assert_rcu_or_pool_mutex() \
-- rcu_lockdep_assert(rcu_read_lock_sched_held() || \
-+ rcu_lockdep_assert(rcu_read_lock_held() || \
- lockdep_is_held(&wq_pool_mutex), \
-- "sched RCU or wq_pool_mutex should be held")
-+ "RCU or wq_pool_mutex should be held")
-
- #define assert_rcu_or_wq_mutex(wq) \
-- rcu_lockdep_assert(rcu_read_lock_sched_held() || \
-+ rcu_lockdep_assert(rcu_read_lock_held() || \
- lockdep_is_held(&wq->mutex), \
-- "sched RCU or wq->mutex should be held")
-+ "RCU or wq->mutex should be held")
-
- #ifdef CONFIG_LOCKDEP
- #define assert_manager_or_pool_lock(pool) \
-@@ -360,7 +369,7 @@ static void copy_workqueue_attrs(struct
- * @pool: iteration cursor
- * @pi: integer used for iteration
- *
-- * This must be called either with wq_pool_mutex held or sched RCU read
-+ * This must be called either with wq_pool_mutex held or RCU read
- * locked. If the pool needs to be used beyond the locking in effect, the
- * caller is responsible for guaranteeing that the pool stays online.
- *
-@@ -393,7 +402,7 @@ static void copy_workqueue_attrs(struct
- * @pwq: iteration cursor
- * @wq: the target workqueue
- *
-- * This must be called either with wq->mutex held or sched RCU read locked.
-+ * This must be called either with wq->mutex held or RCU read locked.
- * If the pwq needs to be used beyond the locking in effect, the caller is
- * responsible for guaranteeing that the pwq stays online.
- *
-@@ -405,6 +414,31 @@ static void copy_workqueue_attrs(struct
- if (({ assert_rcu_or_wq_mutex(wq); false; })) { } \
- else
-
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+static inline void rt_lock_idle_list(struct worker_pool *pool)
-+{
-+ preempt_disable();
-+}
-+static inline void rt_unlock_idle_list(struct worker_pool *pool)
-+{
-+ preempt_enable();
-+}
-+static inline void sched_lock_idle_list(struct worker_pool *pool) { }
-+static inline void sched_unlock_idle_list(struct worker_pool *pool) { }
-+#else
-+static inline void rt_lock_idle_list(struct worker_pool *pool) { }
-+static inline void rt_unlock_idle_list(struct worker_pool *pool) { }
-+static inline void sched_lock_idle_list(struct worker_pool *pool)
-+{
-+ spin_lock_irq(&pool->lock);
-+}
-+static inline void sched_unlock_idle_list(struct worker_pool *pool)
-+{
-+ spin_unlock_irq(&pool->lock);
-+}
-+#endif
-+
-+
- #ifdef CONFIG_DEBUG_OBJECTS_WORK
-
- static struct debug_obj_descr work_debug_descr;
-@@ -548,7 +582,7 @@ static int worker_pool_assign_id(struct
- * @wq: the target workqueue
- * @node: the node ID
- *
-- * This must be called either with pwq_lock held or sched RCU read locked.
-+ * This must be called either with pwq_lock held or RCU read locked.
- * If the pwq needs to be used beyond the locking in effect, the caller is
- * responsible for guaranteeing that the pwq stays online.
- *
-@@ -652,8 +686,8 @@ static struct pool_workqueue *get_work_p
- * @work: the work item of interest
- *
- * Pools are created and destroyed under wq_pool_mutex, and allows read
-- * access under sched-RCU read lock. As such, this function should be
-- * called under wq_pool_mutex or with preemption disabled.
-+ * access under RCU read lock. As such, this function should be
-+ * called under wq_pool_mutex or inside of a rcu_read_lock() region.
- *
- * All fields of the returned pool are accessible as long as the above
- * mentioned locking is in effect. If the returned pool needs to be used
-@@ -804,51 +838,44 @@ static struct worker *first_worker(struc
- */
- static void wake_up_worker(struct worker_pool *pool)
- {
-- struct worker *worker = first_worker(pool);
-+ struct worker *worker;
-+
-+ rt_lock_idle_list(pool);
-+
-+ worker = first_worker(pool);
-
- if (likely(worker))
- wake_up_process(worker->task);
-+
-+ rt_unlock_idle_list(pool);
- }
-
- /**
-- * wq_worker_waking_up - a worker is waking up
-- * @task: task waking up
-- * @cpu: CPU @task is waking up to
-- *
-- * This function is called during try_to_wake_up() when a worker is
-- * being awoken.
-+ * wq_worker_running - a worker is running again
-+ * @task: task returning from sleep
- *
-- * CONTEXT:
-- * spin_lock_irq(rq->lock)
-+ * This function is called when a worker returns from schedule()
- */
--void wq_worker_waking_up(struct task_struct *task, int cpu)
-+void wq_worker_running(struct task_struct *task)
- {
- struct worker *worker = kthread_data(task);
-
-- if (!(worker->flags & WORKER_NOT_RUNNING)) {
-- WARN_ON_ONCE(worker->pool->cpu != cpu);
-+ if (!worker->sleeping)
-+ return;
-+ if (!(worker->flags & WORKER_NOT_RUNNING))
- atomic_inc(&worker->pool->nr_running);
-- }
-+ worker->sleeping = 0;
- }
-
- /**
- * wq_worker_sleeping - a worker is going to sleep
- * @task: task going to sleep
-- * @cpu: CPU in question, must be the current CPU number
-- *
-- * This function is called during schedule() when a busy worker is
-- * going to sleep. Worker on the same cpu can be woken up by
-- * returning pointer to its task.
-- *
-- * CONTEXT:
-- * spin_lock_irq(rq->lock)
-- *
-- * Return:
-- * Worker task on @cpu to wake up, %NULL if none.
-+ * This function is called from schedule() when a busy worker is
-+ * going to sleep.
- */
--struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu)
-+void wq_worker_sleeping(struct task_struct *task)
- {
-- struct worker *worker = kthread_data(task), *to_wakeup = NULL;
-+ struct worker *worker = kthread_data(task);
- struct worker_pool *pool;
-
- /*
-@@ -857,29 +884,26 @@ struct task_struct *wq_worker_sleeping(s
- * checking NOT_RUNNING.
- */
- if (worker->flags & WORKER_NOT_RUNNING)
-- return NULL;
-+ return;
-
- pool = worker->pool;
-
-- /* this can only happen on the local cpu */
-- if (WARN_ON_ONCE(cpu != raw_smp_processor_id()))
-- return NULL;
-+ if (WARN_ON_ONCE(worker->sleeping))
-+ return;
-+
-+ worker->sleeping = 1;
-
- /*
- * The counterpart of the following dec_and_test, implied mb,
- * worklist not empty test sequence is in insert_work().
- * Please read comment there.
-- *
-- * NOT_RUNNING is clear. This means that we're bound to and
-- * running on the local cpu w/ rq lock held and preemption
-- * disabled, which in turn means that none else could be
-- * manipulating idle_list, so dereferencing idle_list without pool
-- * lock is safe.
- */
- if (atomic_dec_and_test(&pool->nr_running) &&
-- !list_empty(&pool->worklist))
-- to_wakeup = first_worker(pool);
-- return to_wakeup ? to_wakeup->task : NULL;
-+ !list_empty(&pool->worklist)) {
-+ sched_lock_idle_list(pool);
-+ wake_up_worker(pool);
-+ sched_unlock_idle_list(pool);
-+ }
- }
-
- /**
-@@ -1086,12 +1110,12 @@ static void put_pwq_unlocked(struct pool
- {
- if (pwq) {
- /*
-- * As both pwqs and pools are sched-RCU protected, the
-+ * As both pwqs and pools are RCU protected, the
- * following lock operations are safe.
- */
-- spin_lock_irq(&pwq->pool->lock);
-+ local_spin_lock_irq(pendingb_lock, &pwq->pool->lock);
- put_pwq(pwq);
-- spin_unlock_irq(&pwq->pool->lock);
-+ local_spin_unlock_irq(pendingb_lock, &pwq->pool->lock);
- }
- }
-
-@@ -1193,7 +1217,7 @@ static int try_to_grab_pending(struct wo
- struct worker_pool *pool;
- struct pool_workqueue *pwq;
-
-- local_irq_save(*flags);
-+ local_lock_irqsave(pendingb_lock, *flags);
-
- /* try to steal the timer if it exists */
- if (is_dwork) {
-@@ -1212,6 +1236,7 @@ static int try_to_grab_pending(struct wo
- if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work)))
- return 0;
-
-+ rcu_read_lock();
- /*
- * The queueing is in progress, or it is already queued. Try to
- * steal it from ->worklist without clearing WORK_STRUCT_PENDING.
-@@ -1250,14 +1275,16 @@ static int try_to_grab_pending(struct wo
- set_work_pool_and_keep_pending(work, pool->id);
-
- spin_unlock(&pool->lock);
-+ rcu_read_unlock();
- return 1;
- }
- spin_unlock(&pool->lock);
- fail:
-- local_irq_restore(*flags);
-+ rcu_read_unlock();
-+ local_unlock_irqrestore(pendingb_lock, *flags);
- if (work_is_canceling(work))
- return -ENOENT;
-- cpu_relax();
-+ cpu_chill();
- return -EAGAIN;
- }
-
-@@ -1326,7 +1353,7 @@ static void __queue_work(int cpu, struct
- * queued or lose PENDING. Grabbing PENDING and queueing should
- * happen with IRQ disabled.
- */
-- WARN_ON_ONCE(!irqs_disabled());
-+ WARN_ON_ONCE_NONRT(!irqs_disabled());
-
- debug_work_activate(work);
-
-@@ -1334,6 +1361,8 @@ static void __queue_work(int cpu, struct
- if (unlikely(wq->flags & __WQ_DRAINING) &&
- WARN_ON_ONCE(!is_chained_work(wq)))
- return;
-+
-+ rcu_read_lock();
- retry:
- if (req_cpu == WORK_CPU_UNBOUND)
- cpu = raw_smp_processor_id();
-@@ -1390,10 +1419,8 @@ retry:
- /* pwq determined, queue */
- trace_workqueue_queue_work(req_cpu, pwq, work);
-
-- if (WARN_ON(!list_empty(&work->entry))) {
-- spin_unlock(&pwq->pool->lock);
-- return;
-- }
-+ if (WARN_ON(!list_empty(&work->entry)))
-+ goto out;
-
- pwq->nr_in_flight[pwq->work_color]++;
- work_flags = work_color_to_flags(pwq->work_color);
-@@ -1409,7 +1436,9 @@ retry:
-
- insert_work(pwq, work, worklist, work_flags);
-
-+out:
- spin_unlock(&pwq->pool->lock);
-+ rcu_read_unlock();
- }
-
- /**
-@@ -1429,14 +1458,14 @@ bool queue_work_on(int cpu, struct workq
- bool ret = false;
- unsigned long flags;
-
-- local_irq_save(flags);
-+ local_lock_irqsave(pendingb_lock,flags);
-
- if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
- __queue_work(cpu, wq, work);
- ret = true;
- }
-
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(pendingb_lock, flags);
- return ret;
- }
- EXPORT_SYMBOL(queue_work_on);
-@@ -1503,14 +1532,14 @@ bool queue_delayed_work_on(int cpu, stru
- unsigned long flags;
-
- /* read the comment in __queue_work() */
-- local_irq_save(flags);
-+ local_lock_irqsave(pendingb_lock, flags);
-
- if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
- __queue_delayed_work(cpu, wq, dwork, delay);
- ret = true;
- }
-
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(pendingb_lock, flags);
- return ret;
- }
- EXPORT_SYMBOL(queue_delayed_work_on);
-@@ -1545,7 +1574,7 @@ bool mod_delayed_work_on(int cpu, struct
-
- if (likely(ret >= 0)) {
- __queue_delayed_work(cpu, wq, dwork, delay);
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(pendingb_lock, flags);
- }
-
- /* -ENOENT from try_to_grab_pending() becomes %true */
-@@ -1578,7 +1607,9 @@ static void worker_enter_idle(struct wor
- worker->last_active = jiffies;
-
- /* idle_list is LIFO */
-+ rt_lock_idle_list(pool);
- list_add(&worker->entry, &pool->idle_list);
-+ rt_unlock_idle_list(pool);
-
- if (too_many_workers(pool) && !timer_pending(&pool->idle_timer))
- mod_timer(&pool->idle_timer, jiffies + IDLE_WORKER_TIMEOUT);
-@@ -1611,7 +1642,9 @@ static void worker_leave_idle(struct wor
- return;
- worker_clr_flags(worker, WORKER_IDLE);
- pool->nr_idle--;
-+ rt_lock_idle_list(pool);
- list_del_init(&worker->entry);
-+ rt_unlock_idle_list(pool);
- }
-
- /**
-@@ -1857,7 +1890,9 @@ static void destroy_worker(struct worker
- */
- get_task_struct(worker->task);
-
-+ rt_lock_idle_list(pool);
- list_del_init(&worker->entry);
-+ rt_unlock_idle_list(pool);
- worker->flags |= WORKER_DIE;
-
- idr_remove(&pool->worker_idr, worker->id);
-@@ -2840,14 +2875,14 @@ static bool start_flush_work(struct work
-
- might_sleep();
-
-- local_irq_disable();
-+ rcu_read_lock();
- pool = get_work_pool(work);
- if (!pool) {
-- local_irq_enable();
-+ rcu_read_unlock();
- return false;
- }
-
-- spin_lock(&pool->lock);
-+ spin_lock_irq(&pool->lock);
- /* see the comment in try_to_grab_pending() with the same code */
- pwq = get_work_pwq(work);
- if (pwq) {
-@@ -2874,10 +2909,11 @@ static bool start_flush_work(struct work
- else
- lock_map_acquire_read(&pwq->wq->lockdep_map);
- lock_map_release(&pwq->wq->lockdep_map);
--
-+ rcu_read_unlock();
- return true;
- already_gone:
- spin_unlock_irq(&pool->lock);
-+ rcu_read_unlock();
- return false;
- }
-
-@@ -2926,7 +2962,7 @@ static bool __cancel_work_timer(struct w
-
- /* tell other tasks trying to grab @work to back off */
- mark_work_canceling(work);
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(pendingb_lock, flags);
-
- flush_work(work);
- clear_work_data(work);
-@@ -2971,10 +3007,10 @@ EXPORT_SYMBOL_GPL(cancel_work_sync);
- */
- bool flush_delayed_work(struct delayed_work *dwork)
- {
-- local_irq_disable();
-+ local_lock_irq(pendingb_lock);
- if (del_timer_sync(&dwork->timer))
- __queue_work(dwork->cpu, dwork->wq, &dwork->work);
-- local_irq_enable();
-+ local_unlock_irq(pendingb_lock);
- return flush_work(&dwork->work);
- }
- EXPORT_SYMBOL(flush_delayed_work);
-@@ -3009,7 +3045,7 @@ bool cancel_delayed_work(struct delayed_
-
- set_work_pool_and_clear_pending(&dwork->work,
- get_work_pool_id(&dwork->work));
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(pendingb_lock, flags);
- return ret;
- }
- EXPORT_SYMBOL(cancel_delayed_work);
-@@ -3195,7 +3231,8 @@ static ssize_t wq_pool_ids_show(struct d
- const char *delim = "";
- int node, written = 0;
-
-- rcu_read_lock_sched();
-+ get_online_cpus();
-+ rcu_read_lock();
- for_each_node(node) {
- written += scnprintf(buf + written, PAGE_SIZE - written,
- "%s%d:%d", delim, node,
-@@ -3203,7 +3240,8 @@ static ssize_t wq_pool_ids_show(struct d
- delim = " ";
- }
- written += scnprintf(buf + written, PAGE_SIZE - written, "\n");
-- rcu_read_unlock_sched();
-+ rcu_read_unlock();
-+ put_online_cpus();
-
- return written;
- }
-@@ -3569,7 +3607,7 @@ static void rcu_free_pool(struct rcu_hea
- * put_unbound_pool - put a worker_pool
- * @pool: worker_pool to put
- *
-- * Put @pool. If its refcnt reaches zero, it gets destroyed in sched-RCU
-+ * Put @pool. If its refcnt reaches zero, it gets destroyed in RCU
- * safe manner. get_unbound_pool() calls this function on its failure path
- * and this function should be able to release pools which went through,
- * successfully or not, init_worker_pool().
-@@ -3616,8 +3654,8 @@ static void put_unbound_pool(struct work
- del_timer_sync(&pool->idle_timer);
- del_timer_sync(&pool->mayday_timer);
-
-- /* sched-RCU protected to allow dereferences from get_work_pool() */
-- call_rcu_sched(&pool->rcu, rcu_free_pool);
-+ /* RCU protected to allow dereferences from get_work_pool() */
-+ call_rcu(&pool->rcu, rcu_free_pool);
- }
-
- /**
-@@ -3730,7 +3768,7 @@ static void pwq_unbound_release_workfn(s
- put_unbound_pool(pool);
- mutex_unlock(&wq_pool_mutex);
-
-- call_rcu_sched(&pwq->rcu, rcu_free_pwq);
-+ call_rcu(&pwq->rcu, rcu_free_pwq);
-
- /*
- * If we're the last pwq going away, @wq is already dead and no one
-@@ -4444,7 +4482,8 @@ bool workqueue_congested(int cpu, struct
- struct pool_workqueue *pwq;
- bool ret;
-
-- rcu_read_lock_sched();
-+ rcu_read_lock();
-+ preempt_disable();
-
- if (cpu == WORK_CPU_UNBOUND)
- cpu = smp_processor_id();
-@@ -4455,7 +4494,8 @@ bool workqueue_congested(int cpu, struct
- pwq = unbound_pwq_by_node(wq, cpu_to_node(cpu));
-
- ret = !list_empty(&pwq->delayed_works);
-- rcu_read_unlock_sched();
-+ preempt_enable();
-+ rcu_read_unlock();
-
- return ret;
- }
-@@ -4481,16 +4521,15 @@ unsigned int work_busy(struct work_struc
- if (work_pending(work))
- ret |= WORK_BUSY_PENDING;
-
-- local_irq_save(flags);
-+ rcu_read_lock();
- pool = get_work_pool(work);
- if (pool) {
-- spin_lock(&pool->lock);
-+ spin_lock_irqsave(&pool->lock, flags);
- if (find_worker_executing_work(pool, work))
- ret |= WORK_BUSY_RUNNING;
-- spin_unlock(&pool->lock);
-+ spin_unlock_irqrestore(&pool->lock, flags);
- }
-- local_irq_restore(flags);
--
-+ rcu_read_unlock();
- return ret;
- }
- EXPORT_SYMBOL_GPL(work_busy);
-@@ -4938,16 +4977,16 @@ bool freeze_workqueues_busy(void)
- * nr_active is monotonically decreasing. It's safe
- * to peek without lock.
- */
-- rcu_read_lock_sched();
-+ rcu_read_lock();
- for_each_pwq(pwq, wq) {
- WARN_ON_ONCE(pwq->nr_active < 0);
- if (pwq->nr_active) {
- busy = true;
-- rcu_read_unlock_sched();
-+ rcu_read_unlock();
- goto out_unlock;
- }
- }
-- rcu_read_unlock_sched();
-+ rcu_read_unlock();
- }
- out_unlock:
- mutex_unlock(&wq_pool_mutex);
-Index: linux-stable/kernel/workqueue_internal.h
-===================================================================
---- linux-stable.orig/kernel/workqueue_internal.h
-+++ linux-stable/kernel/workqueue_internal.h
-@@ -41,6 +41,7 @@ struct worker {
- unsigned long last_active; /* L: last active timestamp */
- unsigned int flags; /* X: flags */
- int id; /* I: worker id */
-+ int sleeping; /* None */
-
- /*
- * Opaque string set with work_set_desc(). Printed out with task
-@@ -66,7 +67,7 @@ static inline struct worker *current_wq_
- * Scheduler hooks for concurrency managed workqueue. Only to be used from
- * sched/core.c and workqueue.c.
- */
--void wq_worker_waking_up(struct task_struct *task, int cpu);
--struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu);
-+void wq_worker_running(struct task_struct *task);
-+void wq_worker_sleeping(struct task_struct *task);
-
- #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */
-Index: linux-stable/include/linux/idr.h
-===================================================================
---- linux-stable.orig/include/linux/idr.h
-+++ linux-stable/include/linux/idr.h
-@@ -92,10 +92,14 @@ void idr_init(struct idr *idp);
- * Each idr_preload() should be matched with an invocation of this
- * function. See idr_preload() for details.
- */
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+void idr_preload_end(void);
-+#else
- static inline void idr_preload_end(void)
- {
- preempt_enable();
- }
-+#endif
-
- /**
- * idr_find - return pointer for given id
-Index: linux-stable/lib/idr.c
-===================================================================
---- linux-stable.orig/lib/idr.c
-+++ linux-stable/lib/idr.c
-@@ -37,6 +37,7 @@
- #include <linux/spinlock.h>
- #include <linux/percpu.h>
- #include <linux/hardirq.h>
-+#include <linux/locallock.h>
-
- #define MAX_IDR_SHIFT (sizeof(int) * 8 - 1)
- #define MAX_IDR_BIT (1U << MAX_IDR_SHIFT)
-@@ -389,6 +390,36 @@ int __idr_get_new_above(struct idr *idp,
- }
- EXPORT_SYMBOL(__idr_get_new_above);
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+static DEFINE_LOCAL_IRQ_LOCK(idr_lock);
-+
-+static inline void idr_preload_lock(void)
-+{
-+ local_lock(idr_lock);
-+}
-+
-+static inline void idr_preload_unlock(void)
-+{
-+ local_unlock(idr_lock);
-+}
-+
-+void idr_preload_end(void)
-+{
-+ idr_preload_unlock();
-+}
-+EXPORT_SYMBOL(idr_preload_end);
-+#else
-+static inline void idr_preload_lock(void)
-+{
-+ preempt_disable();
-+}
-+
-+static inline void idr_preload_unlock(void)
-+{
-+ preempt_enable();
-+}
-+#endif
-+
- /**
- * idr_preload - preload for idr_alloc()
- * @gfp_mask: allocation mask to use for preloading
-@@ -423,7 +454,7 @@ void idr_preload(gfp_t gfp_mask)
- WARN_ON_ONCE(in_interrupt());
- might_sleep_if(gfp_mask & __GFP_WAIT);
-
-- preempt_disable();
-+ idr_preload_lock();
-
- /*
- * idr_alloc() is likely to succeed w/o full idr_layer buffer and
-@@ -435,9 +466,9 @@ void idr_preload(gfp_t gfp_mask)
- while (__this_cpu_read(idr_preload_cnt) < MAX_IDR_FREE) {
- struct idr_layer *new;
-
-- preempt_enable();
-+ idr_preload_unlock();
- new = kmem_cache_zalloc(idr_layer_cache, gfp_mask);
-- preempt_disable();
-+ idr_preload_lock();
- if (!new)
- break;
-
-Index: linux-stable/lib/percpu_ida.c
-===================================================================
---- linux-stable.orig/lib/percpu_ida.c
-+++ linux-stable/lib/percpu_ida.c
-@@ -29,6 +29,9 @@
- #include <linux/string.h>
- #include <linux/spinlock.h>
- #include <linux/percpu_ida.h>
-+#include <linux/locallock.h>
-+
-+static DEFINE_LOCAL_IRQ_LOCK(irq_off_lock);
-
- struct percpu_ida_cpu {
- /*
-@@ -151,13 +154,13 @@ int percpu_ida_alloc(struct percpu_ida *
- unsigned long flags;
- int tag;
-
-- local_irq_save(flags);
-+ local_lock_irqsave(irq_off_lock, flags);
- tags = this_cpu_ptr(pool->tag_cpu);
-
- /* Fastpath */
- tag = alloc_local_tag(tags);
- if (likely(tag >= 0)) {
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(irq_off_lock, flags);
- return tag;
- }
-
-@@ -176,6 +179,7 @@ int percpu_ida_alloc(struct percpu_ida *
-
- if (!tags->nr_free)
- alloc_global_tags(pool, tags);
-+
- if (!tags->nr_free)
- steal_tags(pool, tags);
-
-@@ -187,7 +191,7 @@ int percpu_ida_alloc(struct percpu_ida *
- }
-
- spin_unlock(&pool->lock);
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(irq_off_lock, flags);
-
- if (tag >= 0 || state == TASK_RUNNING)
- break;
-@@ -199,7 +203,7 @@ int percpu_ida_alloc(struct percpu_ida *
-
- schedule();
-
-- local_irq_save(flags);
-+ local_lock_irqsave(irq_off_lock, flags);
- tags = this_cpu_ptr(pool->tag_cpu);
- }
- if (state != TASK_RUNNING)
-@@ -224,7 +228,7 @@ void percpu_ida_free(struct percpu_ida *
-
- BUG_ON(tag >= pool->nr_tags);
-
-- local_irq_save(flags);
-+ local_lock_irqsave(irq_off_lock, flags);
- tags = this_cpu_ptr(pool->tag_cpu);
-
- spin_lock(&tags->lock);
-@@ -256,7 +260,7 @@ void percpu_ida_free(struct percpu_ida *
- spin_unlock(&pool->lock);
- }
-
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(irq_off_lock, flags);
- }
- EXPORT_SYMBOL_GPL(percpu_ida_free);
-
-@@ -348,7 +352,7 @@ int percpu_ida_for_each_free(struct perc
- struct percpu_ida_cpu *remote;
- unsigned cpu, i, err = 0;
-
-- local_irq_save(flags);
-+ local_lock_irqsave(irq_off_lock, flags);
- for_each_possible_cpu(cpu) {
- remote = per_cpu_ptr(pool->tag_cpu, cpu);
- spin_lock(&remote->lock);
-@@ -370,7 +374,7 @@ int percpu_ida_for_each_free(struct perc
- }
- spin_unlock(&pool->lock);
- out:
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(irq_off_lock, flags);
- return err;
- }
- EXPORT_SYMBOL_GPL(percpu_ida_for_each_free);
-Index: linux-stable/lib/debugobjects.c
-===================================================================
---- linux-stable.orig/lib/debugobjects.c
-+++ linux-stable/lib/debugobjects.c
-@@ -308,7 +308,10 @@ __debug_object_init(void *addr, struct d
- struct debug_obj *obj;
- unsigned long flags;
-
-- fill_pool();
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ if (preempt_count() == 0 && !irqs_disabled())
-+#endif
-+ fill_pool();
-
- db = get_bucket((unsigned long) addr);
-
-Index: linux-stable/include/linux/jump_label.h
-===================================================================
---- linux-stable.orig/include/linux/jump_label.h
-+++ linux-stable/include/linux/jump_label.h
-@@ -56,7 +56,8 @@ extern bool static_key_initialized;
- "%s used before call to jump_label_init", \
- __func__)
-
--#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
-+#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL) && \
-+ !defined(CONFIG_PREEMPT_BASE)
-
- struct static_key {
- atomic_t enabled;
-Index: linux-stable/include/linux/netdevice.h
-===================================================================
---- linux-stable.orig/include/linux/netdevice.h
-+++ linux-stable/include/linux/netdevice.h
-@@ -2025,6 +2025,7 @@ struct softnet_data {
- unsigned int dropped;
- struct sk_buff_head input_pkt_queue;
- struct napi_struct backlog;
-+ struct sk_buff_head tofree_queue;
-
- #ifdef CONFIG_NET_FLOW_LIMIT
- struct sd_flow_limit __rcu *flow_limit;
-Index: linux-stable/include/linux/skbuff.h
-===================================================================
---- linux-stable.orig/include/linux/skbuff.h
-+++ linux-stable/include/linux/skbuff.h
-@@ -152,6 +152,7 @@ struct sk_buff_head {
-
- __u32 qlen;
- spinlock_t lock;
-+ raw_spinlock_t raw_lock;
- };
-
- struct sk_buff;
-@@ -1150,6 +1151,12 @@ static inline void skb_queue_head_init(s
- __skb_queue_head_init(list);
- }
-
-+static inline void skb_queue_head_init_raw(struct sk_buff_head *list)
-+{
-+ raw_spin_lock_init(&list->raw_lock);
-+ __skb_queue_head_init(list);
-+}
-+
- static inline void skb_queue_head_init_class(struct sk_buff_head *list,
- struct lock_class_key *class)
- {
-Index: linux-stable/arch/x86/kernel/irq_work.c
-===================================================================
---- linux-stable.orig/arch/x86/kernel/irq_work.c
-+++ linux-stable/arch/x86/kernel/irq_work.c
-@@ -38,6 +38,7 @@ __visible void smp_trace_irq_work_interr
- exiting_irq();
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- void arch_irq_work_raise(void)
- {
- #ifdef CONFIG_X86_LOCAL_APIC
-@@ -48,3 +49,4 @@ void arch_irq_work_raise(void)
- apic_wait_icr_idle();
- #endif
- }
-+#endif
-Index: linux-stable/kernel/irq_work.c
-===================================================================
---- linux-stable.orig/kernel/irq_work.c
-+++ linux-stable/kernel/irq_work.c
-@@ -20,6 +20,9 @@
-
-
- static DEFINE_PER_CPU(struct llist_head, irq_work_list);
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+static DEFINE_PER_CPU(struct llist_head, hirq_work_list);
-+#endif
- static DEFINE_PER_CPU(int, irq_work_raised);
-
- /*
-@@ -48,7 +51,11 @@ static bool irq_work_claim(struct irq_wo
- return true;
- }
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+void arch_irq_work_raise(void)
-+#else
- void __weak arch_irq_work_raise(void)
-+#endif
- {
- /*
- * Lame architectures will get the timer tick callback
-@@ -70,8 +77,12 @@ void irq_work_queue(struct irq_work *wor
- /* Queue the entry and raise the IPI if needed. */
- preempt_disable();
-
-- llist_add(&work->llnode, &__get_cpu_var(irq_work_list));
--
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ if (work->flags & IRQ_WORK_HARD_IRQ)
-+ llist_add(&work->llnode, &__get_cpu_var(hirq_work_list));
-+ else
-+#endif
-+ llist_add(&work->llnode, &__get_cpu_var(irq_work_list));
- /*
- * If the work is not "lazy" or the tick is stopped, raise the irq
- * work interrupt (if supported by the arch), otherwise, just wait
-@@ -115,12 +126,18 @@ static void __irq_work_run(void)
- __this_cpu_write(irq_work_raised, 0);
- barrier();
-
-- this_list = &__get_cpu_var(irq_work_list);
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ if (in_irq())
-+ this_list = &__get_cpu_var(hirq_work_list);
-+ else
-+#endif
-+ this_list = &__get_cpu_var(irq_work_list);
- if (llist_empty(this_list))
- return;
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- BUG_ON(!irqs_disabled());
--
-+#endif
- llnode = llist_del_all(this_list);
- while (llnode != NULL) {
- work = llist_entry(llnode, struct irq_work, llnode);
-@@ -152,7 +169,9 @@ static void __irq_work_run(void)
- */
- void irq_work_run(void)
- {
-+#ifndef CONFIG_PREEMPT_RT_FULL
- BUG_ON(!in_irq());
-+#endif
- __irq_work_run();
- }
- EXPORT_SYMBOL_GPL(irq_work_run);
-Index: linux-stable/arch/arm/kernel/smp.c
-===================================================================
---- linux-stable.orig/arch/arm/kernel/smp.c
-+++ linux-stable/arch/arm/kernel/smp.c
-@@ -454,12 +454,14 @@ void arch_send_call_function_single_ipi(
- }
-
- #ifdef CONFIG_IRQ_WORK
-+#ifndef CONFIG_PREEMPT_RT_FULL
- void arch_irq_work_raise(void)
- {
- if (is_smp())
- smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
- }
- #endif
-+#endif
-
- static const char *ipi_types[NR_IPI] = {
- #define S(x,s) [x] = s
-Index: linux-stable/arch/powerpc/kernel/time.c
-===================================================================
---- linux-stable.orig/arch/powerpc/kernel/time.c
-+++ linux-stable/arch/powerpc/kernel/time.c
-@@ -423,7 +423,7 @@ unsigned long profile_pc(struct pt_regs
- EXPORT_SYMBOL(profile_pc);
- #endif
-
--#ifdef CONFIG_IRQ_WORK
-+#if defined(CONFIG_IRQ_WORK) && !defined(CONFIG_PREEMPT_RT_FULL)
-
- /*
- * 64-bit uses a byte in the PACA, 32-bit uses a per-cpu variable...
-Index: linux-stable/arch/sparc/kernel/pcr.c
-===================================================================
---- linux-stable.orig/arch/sparc/kernel/pcr.c
-+++ linux-stable/arch/sparc/kernel/pcr.c
-@@ -43,10 +43,12 @@ void __irq_entry deferred_pcr_work_irq(i
- set_irq_regs(old_regs);
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- void arch_irq_work_raise(void)
- {
- set_softint(1 << PIL_DEFERRED_PCR_WORK);
- }
-+#endif
-
- const struct pcr_ops *pcr_ops;
- EXPORT_SYMBOL_GPL(pcr_ops);
-Index: linux-stable/include/linux/irq_work.h
-===================================================================
---- linux-stable.orig/include/linux/irq_work.h
-+++ linux-stable/include/linux/irq_work.h
-@@ -16,6 +16,7 @@
- #define IRQ_WORK_BUSY 2UL
- #define IRQ_WORK_FLAGS 3UL
- #define IRQ_WORK_LAZY 4UL /* Doesn't want IPI, wait for tick */
-+#define IRQ_WORK_HARD_IRQ 8UL /* Run hard IRQ context, even on RT */
-
- struct irq_work {
- unsigned long flags;
-Index: linux-stable/arch/powerpc/Kconfig
-===================================================================
---- linux-stable.orig/arch/powerpc/Kconfig
-+++ linux-stable/arch/powerpc/Kconfig
-@@ -60,10 +60,11 @@ config LOCKDEP_SUPPORT
-
- config RWSEM_GENERIC_SPINLOCK
- bool
-+ default y if PREEMPT_RT_FULL
-
- config RWSEM_XCHGADD_ALGORITHM
- bool
-- default y
-+ default y if !PREEMPT_RT_FULL
-
- config GENERIC_LOCKBREAK
- bool
-@@ -132,6 +133,7 @@ config PPC
- select GENERIC_CLOCKEVENTS
- select GENERIC_STRNCPY_FROM_USER
- select GENERIC_STRNLEN_USER
-+ select HAVE_PREEMPT_LAZY
- select HAVE_MOD_ARCH_SPECIFIC
- select MODULES_USE_ELF_RELA
- select CLONE_BACKWARDS
-@@ -292,7 +294,7 @@ menu "Kernel options"
-
- config HIGHMEM
- bool "High memory support"
-- depends on PPC32
-+ depends on PPC32 && !PREEMPT_RT_FULL
-
- source kernel/Kconfig.hz
- source kernel/Kconfig.preempt
-Index: linux-stable/arch/arm/Kconfig
-===================================================================
---- linux-stable.orig/arch/arm/Kconfig
-+++ linux-stable/arch/arm/Kconfig
-@@ -58,6 +58,7 @@ config ARM
- select HAVE_PERF_EVENTS
- select HAVE_PERF_REGS
- select HAVE_PERF_USER_STACK_DUMP
-+ select HAVE_PREEMPT_LAZY
- select HAVE_REGS_AND_STACK_ACCESS_API
- select HAVE_SYSCALL_TRACEPOINTS
- select HAVE_UID16
-Index: linux-stable/arch/arm/kernel/unwind.c
-===================================================================
---- linux-stable.orig/arch/arm/kernel/unwind.c
-+++ linux-stable/arch/arm/kernel/unwind.c
-@@ -87,7 +87,7 @@ extern const struct unwind_idx __start_u
- static const struct unwind_idx *__origin_unwind_idx;
- extern const struct unwind_idx __stop_unwind_idx[];
-
--static DEFINE_SPINLOCK(unwind_lock);
-+static DEFINE_RAW_SPINLOCK(unwind_lock);
- static LIST_HEAD(unwind_tables);
-
- /* Convert a prel31 symbol to an absolute address */
-@@ -195,7 +195,7 @@ static const struct unwind_idx *unwind_f
- /* module unwind tables */
- struct unwind_table *table;
-
-- spin_lock_irqsave(&unwind_lock, flags);
-+ raw_spin_lock_irqsave(&unwind_lock, flags);
- list_for_each_entry(table, &unwind_tables, list) {
- if (addr >= table->begin_addr &&
- addr < table->end_addr) {
-@@ -207,7 +207,7 @@ static const struct unwind_idx *unwind_f
- break;
- }
- }
-- spin_unlock_irqrestore(&unwind_lock, flags);
-+ raw_spin_unlock_irqrestore(&unwind_lock, flags);
- }
-
- pr_debug("%s: idx = %p\n", __func__, idx);
-@@ -469,9 +469,9 @@ struct unwind_table *unwind_table_add(un
- tab->begin_addr = text_addr;
- tab->end_addr = text_addr + text_size;
-
-- spin_lock_irqsave(&unwind_lock, flags);
-+ raw_spin_lock_irqsave(&unwind_lock, flags);
- list_add_tail(&tab->list, &unwind_tables);
-- spin_unlock_irqrestore(&unwind_lock, flags);
-+ raw_spin_unlock_irqrestore(&unwind_lock, flags);
-
- return tab;
- }
-@@ -483,9 +483,9 @@ void unwind_table_del(struct unwind_tabl
- if (!tab)
- return;
-
-- spin_lock_irqsave(&unwind_lock, flags);
-+ raw_spin_lock_irqsave(&unwind_lock, flags);
- list_del(&tab->list);
-- spin_unlock_irqrestore(&unwind_lock, flags);
-+ raw_spin_unlock_irqrestore(&unwind_lock, flags);
-
- kfree(tab);
- }
-Index: linux-stable/arch/mips/Kconfig
-===================================================================
---- linux-stable.orig/arch/mips/Kconfig
-+++ linux-stable/arch/mips/Kconfig
-@@ -2094,7 +2094,7 @@ config CPU_R4400_WORKAROUNDS
- #
- config HIGHMEM
- bool "High Memory Support"
-- depends on 32BIT && CPU_SUPPORTS_HIGHMEM && SYS_SUPPORTS_HIGHMEM
-+ depends on 32BIT && CPU_SUPPORTS_HIGHMEM && SYS_SUPPORTS_HIGHMEM && !PREEMPT_RT_FULL
-
- config CPU_SUPPORTS_HIGHMEM
- bool
-Index: linux-stable/Documentation/sysrq.txt
-===================================================================
---- linux-stable.orig/Documentation/sysrq.txt
-+++ linux-stable/Documentation/sysrq.txt
-@@ -59,10 +59,17 @@ On PowerPC - Press 'ALT - Print Screen (
- On other - If you know of the key combos for other architectures, please
- let me know so I can add them to this section.
-
--On all - write a character to /proc/sysrq-trigger. e.g.:
--
-+On all - write a character to /proc/sysrq-trigger, e.g.:
- echo t > /proc/sysrq-trigger
-
-+On all - Enable network SysRq by writing a cookie to icmp_echo_sysrq, e.g.
-+ echo 0x01020304 >/proc/sys/net/ipv4/icmp_echo_sysrq
-+ Send an ICMP echo request with this pattern plus the particular
-+ SysRq command key. Example:
-+ # ping -c1 -s57 -p0102030468
-+ will trigger the SysRq-H (help) command.
-+
-+
- * What are the 'command' keys?
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- 'b' - Will immediately reboot the system without syncing or unmounting
-Index: linux-stable/include/net/netns/ipv4.h
-===================================================================
---- linux-stable.orig/include/net/netns/ipv4.h
-+++ linux-stable/include/net/netns/ipv4.h
-@@ -61,6 +61,7 @@ struct netns_ipv4 {
-
- int sysctl_icmp_echo_ignore_all;
- int sysctl_icmp_echo_ignore_broadcasts;
-+ int sysctl_icmp_echo_sysrq;
- int sysctl_icmp_ignore_bogus_error_responses;
- int sysctl_icmp_ratelimit;
- int sysctl_icmp_ratemask;
-Index: linux-stable/net/ipv4/icmp.c
-===================================================================
---- linux-stable.orig/net/ipv4/icmp.c
-+++ linux-stable/net/ipv4/icmp.c
-@@ -69,6 +69,7 @@
- #include <linux/jiffies.h>
- #include <linux/kernel.h>
- #include <linux/fcntl.h>
-+#include <linux/sysrq.h>
- #include <linux/socket.h>
- #include <linux/in.h>
- #include <linux/inet.h>
-@@ -803,6 +804,30 @@ static void icmp_redirect(struct sk_buff
- }
-
- /*
-+ * 32bit and 64bit have different timestamp length, so we check for
-+ * the cookie at offset 20 and verify it is repeated at offset 50
-+ */
-+#define CO_POS0 20
-+#define CO_POS1 50
-+#define CO_SIZE sizeof(int)
-+#define ICMP_SYSRQ_SIZE 57
-+
-+/*
-+ * We got a ICMP_SYSRQ_SIZE sized ping request. Check for the cookie
-+ * pattern and if it matches send the next byte as a trigger to sysrq.
-+ */
-+static void icmp_check_sysrq(struct net *net, struct sk_buff *skb)
-+{
-+ int cookie = htonl(net->ipv4.sysctl_icmp_echo_sysrq);
-+ char *p = skb->data;
-+
-+ if (!memcmp(&cookie, p + CO_POS0, CO_SIZE) &&
-+ !memcmp(&cookie, p + CO_POS1, CO_SIZE) &&
-+ p[CO_POS0 + CO_SIZE] == p[CO_POS1 + CO_SIZE])
-+ handle_sysrq(p[CO_POS0 + CO_SIZE]);
-+}
-+
-+/*
- * Handle ICMP_ECHO ("ping") requests.
- *
- * RFC 1122: 3.2.2.6 MUST have an echo server that answers ICMP echo
-@@ -829,6 +854,11 @@ static void icmp_echo(struct sk_buff *sk
- icmp_param.data_len = skb->len;
- icmp_param.head_len = sizeof(struct icmphdr);
- icmp_reply(&icmp_param, skb);
-+
-+ if (skb->len == ICMP_SYSRQ_SIZE &&
-+ net->ipv4.sysctl_icmp_echo_sysrq) {
-+ icmp_check_sysrq(net, skb);
-+ }
- }
- }
-
-Index: linux-stable/net/ipv4/sysctl_net_ipv4.c
-===================================================================
---- linux-stable.orig/net/ipv4/sysctl_net_ipv4.c
-+++ linux-stable/net/ipv4/sysctl_net_ipv4.c
-@@ -776,6 +776,13 @@ static struct ctl_table ipv4_net_table[]
- .proc_handler = proc_dointvec
- },
- {
-+ .procname = "icmp_echo_sysrq",
-+ .data = &init_net.ipv4.sysctl_icmp_echo_sysrq,
-+ .maxlen = sizeof(int),
-+ .mode = 0644,
-+ .proc_handler = proc_dointvec
-+ },
-+ {
- .procname = "icmp_ignore_bogus_error_responses",
- .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
- .maxlen = sizeof(int),
-Index: linux-stable/include/linux/kdb.h
-===================================================================
---- linux-stable.orig/include/linux/kdb.h
-+++ linux-stable/include/linux/kdb.h
-@@ -116,7 +116,7 @@ extern int kdb_trap_printk;
- extern __printf(1, 0) int vkdb_printf(const char *fmt, va_list args);
- extern __printf(1, 2) int kdb_printf(const char *, ...);
- typedef __printf(1, 2) int (*kdb_printf_t)(const char *, ...);
--
-+#define in_kdb_printk() (kdb_trap_printk)
- extern void kdb_init(int level);
-
- /* Access to kdb specific polling devices */
-@@ -151,6 +151,7 @@ extern int kdb_register_repeat(char *, k
- extern int kdb_unregister(char *);
- #else /* ! CONFIG_KGDB_KDB */
- static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; }
-+#define in_kdb_printk() (0)
- static inline void kdb_init(int level) {}
- static inline int kdb_register(char *cmd, kdb_func_t func, char *usage,
- char *help, short minlen) { return 0; }
-Index: linux-stable/kernel/debug/kdb/kdb_io.c
-===================================================================
---- linux-stable.orig/kernel/debug/kdb/kdb_io.c
-+++ linux-stable/kernel/debug/kdb/kdb_io.c
-@@ -554,7 +554,6 @@ int vkdb_printf(const char *fmt, va_list
- int linecount;
- int colcount;
- int logging, saved_loglevel = 0;
-- int saved_trap_printk;
- int got_printf_lock = 0;
- int retlen = 0;
- int fnd, len;
-@@ -565,8 +564,6 @@ int vkdb_printf(const char *fmt, va_list
- unsigned long uninitialized_var(flags);
-
- preempt_disable();
-- saved_trap_printk = kdb_trap_printk;
-- kdb_trap_printk = 0;
-
- /* Serialize kdb_printf if multiple cpus try to write at once.
- * But if any cpu goes recursive in kdb, just print the output,
-@@ -833,7 +830,6 @@ kdb_print_out:
- } else {
- __release(kdb_printf_lock);
- }
-- kdb_trap_printk = saved_trap_printk;
- preempt_enable();
- return retlen;
- }
-@@ -843,9 +839,11 @@ int kdb_printf(const char *fmt, ...)
- va_list ap;
- int r;
-
-+ kdb_trap_printk++;
- va_start(ap, fmt);
- r = vkdb_printf(fmt, ap);
- va_end(ap);
-+ kdb_trap_printk--;
-
- return r;
- }
-Index: linux-stable/kernel/ksysfs.c
-===================================================================
---- linux-stable.orig/kernel/ksysfs.c
-+++ linux-stable/kernel/ksysfs.c
-@@ -132,6 +132,15 @@ KERNEL_ATTR_RO(vmcoreinfo);
-
- #endif /* CONFIG_KEXEC */
-
-+#if defined(CONFIG_PREEMPT_RT_FULL)
-+static ssize_t realtime_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ return sprintf(buf, "%d\n", 1);
-+}
-+KERNEL_ATTR_RO(realtime);
-+#endif
-+
- /* whether file capabilities are enabled */
- static ssize_t fscaps_show(struct kobject *kobj,
- struct kobj_attribute *attr, char *buf)
-@@ -197,6 +206,9 @@ static struct attribute * kernel_attrs[]
- &vmcoreinfo_attr.attr,
- #endif
- &rcu_expedited_attr.attr,
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ &realtime_attr.attr,
-+#endif
- NULL
- };
-
-Index: linux-stable/arch/x86/kernel/process_32.c
-===================================================================
---- linux-stable.orig/arch/x86/kernel/process_32.c
-+++ linux-stable/arch/x86/kernel/process_32.c
-@@ -35,6 +35,7 @@
- #include <linux/uaccess.h>
- #include <linux/io.h>
- #include <linux/kdebug.h>
-+#include <linux/highmem.h>
-
- #include <asm/pgtable.h>
- #include <asm/ldt.h>
-@@ -218,6 +219,35 @@ start_thread(struct pt_regs *regs, unsig
- }
- EXPORT_SYMBOL_GPL(start_thread);
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+static void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p)
-+{
-+ int i;
-+
-+ /*
-+ * Clear @prev's kmap_atomic mappings
-+ */
-+ for (i = 0; i < prev_p->kmap_idx; i++) {
-+ int idx = i + KM_TYPE_NR * smp_processor_id();
-+ pte_t *ptep = kmap_pte - idx;
-+
-+ kpte_clear_flush(ptep, __fix_to_virt(FIX_KMAP_BEGIN + idx));
-+ }
-+ /*
-+ * Restore @next_p's kmap_atomic mappings
-+ */
-+ for (i = 0; i < next_p->kmap_idx; i++) {
-+ int idx = i + KM_TYPE_NR * smp_processor_id();
-+
-+ if (!pte_none(next_p->kmap_pte[i]))
-+ set_pte(kmap_pte - idx, next_p->kmap_pte[i]);
-+ }
-+}
-+#else
-+static inline void
-+switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p) { }
-+#endif
-+
-
- /*
- * switch_to(x,y) should switch tasks from x to y.
-@@ -305,6 +335,8 @@ __switch_to(struct task_struct *prev_p,
- task_thread_info(next_p)->flags & _TIF_WORK_CTXSW_NEXT))
- __switch_to_xtra(prev_p, next_p, tss);
-
-+ switch_kmaps(prev_p, next_p);
-+
- /*
- * Leave lazy mode, flushing any hypercalls made here.
- * This must be done before restoring TLS segments so
-Index: linux-stable/arch/x86/mm/highmem_32.c
-===================================================================
---- linux-stable.orig/arch/x86/mm/highmem_32.c
-+++ linux-stable/arch/x86/mm/highmem_32.c
-@@ -32,6 +32,7 @@ EXPORT_SYMBOL(kunmap);
- */
- void *kmap_atomic_prot(struct page *page, pgprot_t prot)
- {
-+ pte_t pte = mk_pte(page, prot);
- unsigned long vaddr;
- int idx, type;
-
-@@ -45,7 +46,10 @@ void *kmap_atomic_prot(struct page *page
- idx = type + KM_TYPE_NR*smp_processor_id();
- vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
- BUG_ON(!pte_none(*(kmap_pte-idx)));
-- set_pte(kmap_pte-idx, mk_pte(page, prot));
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ current->kmap_pte[type] = pte;
-+#endif
-+ set_pte(kmap_pte-idx, pte);
- arch_flush_lazy_mmu_mode();
-
- return (void *)vaddr;
-@@ -88,6 +92,9 @@ void __kunmap_atomic(void *kvaddr)
- * is a bad idea also, in case the page changes cacheability
- * attributes or becomes a protected page in a hypervisor.
- */
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ current->kmap_pte[type] = __pte(0);
-+#endif
- kpte_clear_flush(kmap_pte-idx, vaddr);
- kmap_atomic_idx_pop();
- arch_flush_lazy_mmu_mode();
-Index: linux-stable/arch/x86/mm/iomap_32.c
-===================================================================
---- linux-stable.orig/arch/x86/mm/iomap_32.c
-+++ linux-stable/arch/x86/mm/iomap_32.c
-@@ -56,6 +56,7 @@ EXPORT_SYMBOL_GPL(iomap_free);
-
- void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot)
- {
-+ pte_t pte = pfn_pte(pfn, prot);
- unsigned long vaddr;
- int idx, type;
-
-@@ -64,7 +65,12 @@ void *kmap_atomic_prot_pfn(unsigned long
- type = kmap_atomic_idx_push();
- idx = type + KM_TYPE_NR * smp_processor_id();
- vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
-- set_pte(kmap_pte - idx, pfn_pte(pfn, prot));
-+ WARN_ON(!pte_none(*(kmap_pte - idx)));
-+
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ current->kmap_pte[type] = pte;
-+#endif
-+ set_pte(kmap_pte - idx, pte);
- arch_flush_lazy_mmu_mode();
-
- return (void *)vaddr;
-@@ -110,6 +116,9 @@ iounmap_atomic(void __iomem *kvaddr)
- * is a bad idea also, in case the page changes cacheability
- * attributes or becomes a protected page in a hypervisor.
- */
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ current->kmap_pte[type] = __pte(0);
-+#endif
- kpte_clear_flush(kmap_pte-idx, vaddr);
- kmap_atomic_idx_pop();
- }
-Index: linux-stable/include/linux/highmem.h
-===================================================================
---- linux-stable.orig/include/linux/highmem.h
-+++ linux-stable/include/linux/highmem.h
-@@ -7,6 +7,7 @@
- #include <linux/mm.h>
- #include <linux/uaccess.h>
- #include <linux/hardirq.h>
-+#include <linux/sched.h>
-
- #include <asm/cacheflush.h>
-
-@@ -85,32 +86,51 @@ static inline void __kunmap_atomic(void
-
- #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32)
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- DECLARE_PER_CPU(int, __kmap_atomic_idx);
-+#endif
-
- static inline int kmap_atomic_idx_push(void)
- {
-+#ifndef CONFIG_PREEMPT_RT_FULL
- int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1;
-
--#ifdef CONFIG_DEBUG_HIGHMEM
-+# ifdef CONFIG_DEBUG_HIGHMEM
- WARN_ON_ONCE(in_irq() && !irqs_disabled());
- BUG_ON(idx > KM_TYPE_NR);
--#endif
-+# endif
- return idx;
-+#else
-+ current->kmap_idx++;
-+ BUG_ON(current->kmap_idx > KM_TYPE_NR);
-+ return current->kmap_idx - 1;
-+#endif
- }
-
- static inline int kmap_atomic_idx(void)
- {
-+#ifndef CONFIG_PREEMPT_RT_FULL
- return __this_cpu_read(__kmap_atomic_idx) - 1;
-+#else
-+ return current->kmap_idx - 1;
-+#endif
- }
-
- static inline void kmap_atomic_idx_pop(void)
- {
--#ifdef CONFIG_DEBUG_HIGHMEM
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+# ifdef CONFIG_DEBUG_HIGHMEM
- int idx = __this_cpu_dec_return(__kmap_atomic_idx);
-
- BUG_ON(idx < 0);
--#else
-+# else
- __this_cpu_dec(__kmap_atomic_idx);
-+# endif
-+#else
-+ current->kmap_idx--;
-+# ifdef CONFIG_DEBUG_HIGHMEM
-+ BUG_ON(current->kmap_idx < 0);
-+# endif
- #endif
- }
-
-Index: linux-stable/mm/highmem.c
-===================================================================
---- linux-stable.orig/mm/highmem.c
-+++ linux-stable/mm/highmem.c
-@@ -29,10 +29,11 @@
- #include <linux/kgdb.h>
- #include <asm/tlbflush.h>
-
--
-+#ifndef CONFIG_PREEMPT_RT_FULL
- #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32)
- DEFINE_PER_CPU(int, __kmap_atomic_idx);
- #endif
-+#endif
-
- /*
- * Virtual_count is not a pure "count".
-@@ -47,8 +48,9 @@ DEFINE_PER_CPU(int, __kmap_atomic_idx);
- unsigned long totalhigh_pages __read_mostly;
- EXPORT_SYMBOL(totalhigh_pages);
-
--
-+#ifndef CONFIG_PREEMPT_RT_FULL
- EXPORT_PER_CPU_SYMBOL(__kmap_atomic_idx);
-+#endif
-
- unsigned int nr_free_highpages (void)
- {
-Index: linux-stable/arch/arm/mm/highmem.c
-===================================================================
---- linux-stable.orig/arch/arm/mm/highmem.c
-+++ linux-stable/arch/arm/mm/highmem.c
-@@ -38,6 +38,7 @@ EXPORT_SYMBOL(kunmap);
-
- void *kmap_atomic(struct page *page)
- {
-+ pte_t pte = mk_pte(page, kmap_prot);
- unsigned int idx;
- unsigned long vaddr;
- void *kmap;
-@@ -76,7 +77,10 @@ void *kmap_atomic(struct page *page)
- * in place, so the contained TLB flush ensures the TLB is updated
- * with the new mapping.
- */
-- set_top_pte(vaddr, mk_pte(page, kmap_prot));
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ current->kmap_pte[type] = pte;
-+#endif
-+ set_top_pte(vaddr, pte);
-
- return (void *)vaddr;
- }
-@@ -93,12 +97,15 @@ void __kunmap_atomic(void *kvaddr)
-
- if (cache_is_vivt())
- __cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ current->kmap_pte[type] = __pte(0);
-+#endif
- #ifdef CONFIG_DEBUG_HIGHMEM
- BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
-- set_top_pte(vaddr, __pte(0));
- #else
- (void) idx; /* to kill a warning */
- #endif
-+ set_top_pte(vaddr, __pte(0));
- kmap_atomic_idx_pop();
- } else if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) {
- /* this address was obtained through kmap_high_get() */
-@@ -110,6 +117,7 @@ EXPORT_SYMBOL(__kunmap_atomic);
-
- void *kmap_atomic_pfn(unsigned long pfn)
- {
-+ pte_t pte = pfn_pte(pfn, kmap_prot);
- unsigned long vaddr;
- int idx, type;
-
-@@ -121,7 +129,10 @@ void *kmap_atomic_pfn(unsigned long pfn)
- #ifdef CONFIG_DEBUG_HIGHMEM
- BUG_ON(!pte_none(get_top_pte(vaddr)));
- #endif
-- set_top_pte(vaddr, pfn_pte(pfn, kmap_prot));
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ current->kmap_pte[type] = pte;
-+#endif
-+ set_top_pte(vaddr, pte);
-
- return (void *)vaddr;
- }
-@@ -135,3 +146,29 @@ struct page *kmap_atomic_to_page(const v
-
- return pte_page(get_top_pte(vaddr));
- }
-+
-+#if defined CONFIG_PREEMPT_RT_FULL
-+void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p)
-+{
-+ int i;
-+
-+ /*
-+ * Clear @prev's kmap_atomic mappings
-+ */
-+ for (i = 0; i < prev_p->kmap_idx; i++) {
-+ int idx = i + KM_TYPE_NR * smp_processor_id();
-+
-+ set_top_pte(__fix_to_virt(FIX_KMAP_BEGIN + idx), __pte(0));
-+ }
-+ /*
-+ * Restore @next_p's kmap_atomic mappings
-+ */
-+ for (i = 0; i < next_p->kmap_idx; i++) {
-+ int idx = i + KM_TYPE_NR * smp_processor_id();
-+
-+ if (!pte_none(next_p->kmap_pte[i]))
-+ set_top_pte(__fix_to_virt(FIX_KMAP_BEGIN + idx),
-+ next_p->kmap_pte[i]);
-+ }
-+}
-+#endif
-Index: linux-stable/arch/arm/include/asm/switch_to.h
-===================================================================
---- linux-stable.orig/arch/arm/include/asm/switch_to.h
-+++ linux-stable/arch/arm/include/asm/switch_to.h
-@@ -3,6 +3,13 @@
-
- #include <linux/thread_info.h>
-
-+#if defined CONFIG_PREEMPT_RT_FULL && defined CONFIG_HIGHMEM
-+void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p);
-+#else
-+static inline void
-+switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p) { }
-+#endif
-+
- /*
- * For v7 SMP cores running a preemptible kernel we may be pre-empted
- * during a TLB maintenance operation, so execute an inner-shareable dsb
-@@ -22,6 +29,7 @@ extern struct task_struct *__switch_to(s
-
- #define switch_to(prev,next,last) \
- do { \
-+ switch_kmaps(prev, next); \
- last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \
- } while (0)
-
-Index: linux-stable/ipc/sem.c
-===================================================================
---- linux-stable.orig/ipc/sem.c
-+++ linux-stable/ipc/sem.c
-@@ -667,6 +667,13 @@ undo:
- static void wake_up_sem_queue_prepare(struct list_head *pt,
- struct sem_queue *q, int error)
- {
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+ struct task_struct *p = q->sleeper;
-+ get_task_struct(p);
-+ q->status = error;
-+ wake_up_process(p);
-+ put_task_struct(p);
-+#else
- if (list_empty(pt)) {
- /*
- * Hold preempt off so that we don't get preempted and have the
-@@ -678,6 +685,7 @@ static void wake_up_sem_queue_prepare(st
- q->pid = error;
-
- list_add_tail(&q->list, pt);
-+#endif
- }
-
- /**
-@@ -691,6 +699,7 @@ static void wake_up_sem_queue_prepare(st
- */
- static void wake_up_sem_queue_do(struct list_head *pt)
- {
-+#ifndef CONFIG_PREEMPT_RT_BASE
- struct sem_queue *q, *t;
- int did_something;
-
-@@ -703,6 +712,7 @@ static void wake_up_sem_queue_do(struct
- }
- if (did_something)
- preempt_enable();
-+#endif
- }
-
- static void unlink_queue(struct sem_array *sma, struct sem_queue *q)
-Index: linux-stable/arch/x86/kvm/x86.c
-===================================================================
---- linux-stable.orig/arch/x86/kvm/x86.c
-+++ linux-stable/arch/x86/kvm/x86.c
-@@ -5531,6 +5531,13 @@ int kvm_arch_init(void *opaque)
- goto out;
- }
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
-+ printk(KERN_ERR "RT requires X86_FEATURE_CONSTANT_TSC\n");
-+ return -EOPNOTSUPP;
-+ }
-+#endif
-+
- r = kvm_mmu_module_init();
- if (r)
- goto out_free_percpu;
-Index: linux-stable/drivers/scsi/fcoe/fcoe.c
-===================================================================
---- linux-stable.orig/drivers/scsi/fcoe/fcoe.c
-+++ linux-stable/drivers/scsi/fcoe/fcoe.c
-@@ -1286,7 +1286,7 @@ static void fcoe_percpu_thread_destroy(u
- struct sk_buff *skb;
- #ifdef CONFIG_SMP
- struct fcoe_percpu_s *p0;
-- unsigned targ_cpu = get_cpu();
-+ unsigned targ_cpu = get_cpu_light();
- #endif /* CONFIG_SMP */
-
- FCOE_DBG("Destroying receive thread for CPU %d\n", cpu);
-@@ -1342,7 +1342,7 @@ static void fcoe_percpu_thread_destroy(u
- kfree_skb(skb);
- spin_unlock_bh(&p->fcoe_rx_list.lock);
- }
-- put_cpu();
-+ put_cpu_light();
- #else
- /*
- * This a non-SMP scenario where the singular Rx thread is
-@@ -1566,11 +1566,11 @@ err2:
- static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen)
- {
- struct fcoe_percpu_s *fps;
-- int rc;
-+ int rc, cpu = get_cpu_light();
-
-- fps = &get_cpu_var(fcoe_percpu);
-+ fps = &per_cpu(fcoe_percpu, cpu);
- rc = fcoe_get_paged_crc_eof(skb, tlen, fps);
-- put_cpu_var(fcoe_percpu);
-+ put_cpu_light();
-
- return rc;
- }
-@@ -1768,11 +1768,11 @@ static inline int fcoe_filter_frames(str
- return 0;
- }
-
-- stats = per_cpu_ptr(lport->stats, get_cpu());
-+ stats = per_cpu_ptr(lport->stats, get_cpu_light());
- stats->InvalidCRCCount++;
- if (stats->InvalidCRCCount < 5)
- printk(KERN_WARNING "fcoe: dropping frame with CRC error\n");
-- put_cpu();
-+ put_cpu_light();
- return -EINVAL;
- }
-
-@@ -1848,13 +1848,13 @@ static void fcoe_recv_frame(struct sk_bu
- goto drop;
-
- if (!fcoe_filter_frames(lport, fp)) {
-- put_cpu();
-+ put_cpu_light();
- fc_exch_recv(lport, fp);
- return;
- }
- drop:
- stats->ErrorFrames++;
-- put_cpu();
-+ put_cpu_light();
- kfree_skb(skb);
- }
-
-Index: linux-stable/drivers/scsi/fcoe/fcoe_ctlr.c
-===================================================================
---- linux-stable.orig/drivers/scsi/fcoe/fcoe_ctlr.c
-+++ linux-stable/drivers/scsi/fcoe/fcoe_ctlr.c
-@@ -831,7 +831,7 @@ static unsigned long fcoe_ctlr_age_fcfs(
-
- INIT_LIST_HEAD(&del_list);
-
-- stats = per_cpu_ptr(fip->lp->stats, get_cpu());
-+ stats = per_cpu_ptr(fip->lp->stats, get_cpu_light());
-
- list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
- deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2;
-@@ -867,7 +867,7 @@ static unsigned long fcoe_ctlr_age_fcfs(
- sel_time = fcf->time;
- }
- }
-- put_cpu();
-+ put_cpu_light();
-
- list_for_each_entry_safe(fcf, next, &del_list, list) {
- /* Removes fcf from current list */
-Index: linux-stable/drivers/scsi/libfc/fc_exch.c
-===================================================================
---- linux-stable.orig/drivers/scsi/libfc/fc_exch.c
-+++ linux-stable/drivers/scsi/libfc/fc_exch.c
-@@ -816,10 +816,10 @@ static struct fc_exch *fc_exch_em_alloc(
- }
- memset(ep, 0, sizeof(*ep));
-
-- cpu = get_cpu();
-+ cpu = get_cpu_light();
- pool = per_cpu_ptr(mp->pool, cpu);
- spin_lock_bh(&pool->lock);
-- put_cpu();
-+ put_cpu_light();
-
- /* peek cache of free slot */
- if (pool->left != FC_XID_UNKNOWN) {
-Index: linux-stable/arch/x86/crypto/aesni-intel_glue.c
-===================================================================
---- linux-stable.orig/arch/x86/crypto/aesni-intel_glue.c
-+++ linux-stable/arch/x86/crypto/aesni-intel_glue.c
-@@ -372,14 +372,14 @@ static int ecb_encrypt(struct blkcipher_
- err = blkcipher_walk_virt(desc, &walk);
- desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
-- kernel_fpu_begin();
- while ((nbytes = walk.nbytes)) {
-+ kernel_fpu_begin();
- aesni_ecb_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
-- nbytes & AES_BLOCK_MASK);
-+ nbytes & AES_BLOCK_MASK);
-+ kernel_fpu_end();
- nbytes &= AES_BLOCK_SIZE - 1;
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
-- kernel_fpu_end();
-
- return err;
- }
-@@ -396,14 +396,14 @@ static int ecb_decrypt(struct blkcipher_
- err = blkcipher_walk_virt(desc, &walk);
- desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
-- kernel_fpu_begin();
- while ((nbytes = walk.nbytes)) {
-+ kernel_fpu_begin();
- aesni_ecb_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr,
- nbytes & AES_BLOCK_MASK);
-+ kernel_fpu_end();
- nbytes &= AES_BLOCK_SIZE - 1;
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
-- kernel_fpu_end();
-
- return err;
- }
-@@ -420,14 +420,14 @@ static int cbc_encrypt(struct blkcipher_
- err = blkcipher_walk_virt(desc, &walk);
- desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
-- kernel_fpu_begin();
- while ((nbytes = walk.nbytes)) {
-+ kernel_fpu_begin();
- aesni_cbc_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
- nbytes & AES_BLOCK_MASK, walk.iv);
-+ kernel_fpu_end();
- nbytes &= AES_BLOCK_SIZE - 1;
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
-- kernel_fpu_end();
-
- return err;
- }
-@@ -444,14 +444,14 @@ static int cbc_decrypt(struct blkcipher_
- err = blkcipher_walk_virt(desc, &walk);
- desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
-- kernel_fpu_begin();
- while ((nbytes = walk.nbytes)) {
-+ kernel_fpu_begin();
- aesni_cbc_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr,
- nbytes & AES_BLOCK_MASK, walk.iv);
-+ kernel_fpu_end();
- nbytes &= AES_BLOCK_SIZE - 1;
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
-- kernel_fpu_end();
-
- return err;
- }
-@@ -484,18 +484,20 @@ static int ctr_crypt(struct blkcipher_de
- err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
- desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
-- kernel_fpu_begin();
- while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
-+ kernel_fpu_begin();
- aesni_ctr_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
- nbytes & AES_BLOCK_MASK, walk.iv);
-+ kernel_fpu_end();
- nbytes &= AES_BLOCK_SIZE - 1;
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
- if (walk.nbytes) {
-+ kernel_fpu_begin();
- ctr_crypt_final(ctx, &walk);
-+ kernel_fpu_end();
- err = blkcipher_walk_done(desc, &walk, 0);
- }
-- kernel_fpu_end();
-
- return err;
- }
-Index: linux-stable/arch/x86/crypto/cast5_avx_glue.c
-===================================================================
---- linux-stable.orig/arch/x86/crypto/cast5_avx_glue.c
-+++ linux-stable/arch/x86/crypto/cast5_avx_glue.c
-@@ -60,7 +60,7 @@ static inline void cast5_fpu_end(bool fp
- static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
- bool enc)
- {
-- bool fpu_enabled = false;
-+ bool fpu_enabled;
- struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
- const unsigned int bsize = CAST5_BLOCK_SIZE;
- unsigned int nbytes;
-@@ -76,7 +76,7 @@ static int ecb_crypt(struct blkcipher_de
- u8 *wsrc = walk->src.virt.addr;
- u8 *wdst = walk->dst.virt.addr;
-
-- fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
-+ fpu_enabled = cast5_fpu_begin(false, nbytes);
-
- /* Process multi-block batch */
- if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
-@@ -104,10 +104,9 @@ static int ecb_crypt(struct blkcipher_de
- } while (nbytes >= bsize);
-
- done:
-+ cast5_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, walk, nbytes);
- }
--
-- cast5_fpu_end(fpu_enabled);
- return err;
- }
-
-@@ -231,7 +230,7 @@ done:
- static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
- struct scatterlist *src, unsigned int nbytes)
- {
-- bool fpu_enabled = false;
-+ bool fpu_enabled;
- struct blkcipher_walk walk;
- int err;
-
-@@ -240,12 +239,11 @@ static int cbc_decrypt(struct blkcipher_
- desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
- while ((nbytes = walk.nbytes)) {
-- fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
-+ fpu_enabled = cast5_fpu_begin(false, nbytes);
- nbytes = __cbc_decrypt(desc, &walk);
-+ cast5_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
--
-- cast5_fpu_end(fpu_enabled);
- return err;
- }
-
-@@ -315,7 +313,7 @@ done:
- static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
- struct scatterlist *src, unsigned int nbytes)
- {
-- bool fpu_enabled = false;
-+ bool fpu_enabled;
- struct blkcipher_walk walk;
- int err;
-
-@@ -324,13 +322,12 @@ static int ctr_crypt(struct blkcipher_de
- desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
- while ((nbytes = walk.nbytes) >= CAST5_BLOCK_SIZE) {
-- fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
-+ fpu_enabled = cast5_fpu_begin(false, nbytes);
- nbytes = __ctr_crypt(desc, &walk);
-+ cast5_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
-
-- cast5_fpu_end(fpu_enabled);
--
- if (walk.nbytes) {
- ctr_crypt_final(desc, &walk);
- err = blkcipher_walk_done(desc, &walk, 0);
-Index: linux-stable/arch/x86/crypto/glue_helper.c
-===================================================================
---- linux-stable.orig/arch/x86/crypto/glue_helper.c
-+++ linux-stable/arch/x86/crypto/glue_helper.c
-@@ -39,7 +39,7 @@ static int __glue_ecb_crypt_128bit(const
- void *ctx = crypto_blkcipher_ctx(desc->tfm);
- const unsigned int bsize = 128 / 8;
- unsigned int nbytes, i, func_bytes;
-- bool fpu_enabled = false;
-+ bool fpu_enabled;
- int err;
-
- err = blkcipher_walk_virt(desc, walk);
-@@ -49,7 +49,7 @@ static int __glue_ecb_crypt_128bit(const
- u8 *wdst = walk->dst.virt.addr;
-
- fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
-- desc, fpu_enabled, nbytes);
-+ desc, false, nbytes);
-
- for (i = 0; i < gctx->num_funcs; i++) {
- func_bytes = bsize * gctx->funcs[i].num_blocks;
-@@ -71,10 +71,10 @@ static int __glue_ecb_crypt_128bit(const
- }
-
- done:
-+ glue_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, walk, nbytes);
- }
-
-- glue_fpu_end(fpu_enabled);
- return err;
- }
-
-@@ -194,7 +194,7 @@ int glue_cbc_decrypt_128bit(const struct
- struct scatterlist *src, unsigned int nbytes)
- {
- const unsigned int bsize = 128 / 8;
-- bool fpu_enabled = false;
-+ bool fpu_enabled;
- struct blkcipher_walk walk;
- int err;
-
-@@ -203,12 +203,12 @@ int glue_cbc_decrypt_128bit(const struct
-
- while ((nbytes = walk.nbytes)) {
- fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
-- desc, fpu_enabled, nbytes);
-+ desc, false, nbytes);
- nbytes = __glue_cbc_decrypt_128bit(gctx, desc, &walk);
-+ glue_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
-
-- glue_fpu_end(fpu_enabled);
- return err;
- }
- EXPORT_SYMBOL_GPL(glue_cbc_decrypt_128bit);
-@@ -278,7 +278,7 @@ int glue_ctr_crypt_128bit(const struct c
- struct scatterlist *src, unsigned int nbytes)
- {
- const unsigned int bsize = 128 / 8;
-- bool fpu_enabled = false;
-+ bool fpu_enabled;
- struct blkcipher_walk walk;
- int err;
-
-@@ -287,13 +287,12 @@ int glue_ctr_crypt_128bit(const struct c
-
- while ((nbytes = walk.nbytes) >= bsize) {
- fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
-- desc, fpu_enabled, nbytes);
-+ desc, false, nbytes);
- nbytes = __glue_ctr_crypt_128bit(gctx, desc, &walk);
-+ glue_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, &walk, nbytes);
- }
-
-- glue_fpu_end(fpu_enabled);
--
- if (walk.nbytes) {
- glue_ctr_crypt_final_128bit(
- gctx->funcs[gctx->num_funcs - 1].fn_u.ctr, desc, &walk);
-@@ -348,7 +347,7 @@ int glue_xts_crypt_128bit(const struct c
- void *tweak_ctx, void *crypt_ctx)
- {
- const unsigned int bsize = 128 / 8;
-- bool fpu_enabled = false;
-+ bool fpu_enabled;
- struct blkcipher_walk walk;
- int err;
-
-@@ -361,21 +360,21 @@ int glue_xts_crypt_128bit(const struct c
-
- /* set minimum length to bsize, for tweak_fn */
- fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
-- desc, fpu_enabled,
-+ desc, false,
- nbytes < bsize ? bsize : nbytes);
--
- /* calculate first value of T */
- tweak_fn(tweak_ctx, walk.iv, walk.iv);
-+ glue_fpu_end(fpu_enabled);
-
- while (nbytes) {
-+ fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
-+ desc, false, nbytes);
- nbytes = __glue_xts_crypt_128bit(gctx, crypt_ctx, desc, &walk);
-
-+ glue_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, &walk, nbytes);
- nbytes = walk.nbytes;
- }
--
-- glue_fpu_end(fpu_enabled);
--
- return err;
- }
- EXPORT_SYMBOL_GPL(glue_xts_crypt_128bit);
-Index: linux-stable/drivers/md/dm.c
-===================================================================
---- linux-stable.orig/drivers/md/dm.c
-+++ linux-stable/drivers/md/dm.c
-@@ -1716,14 +1716,14 @@ static void dm_request_fn(struct request
- if (map_request(ti, clone, md))
- goto requeued;
-
-- BUG_ON(!irqs_disabled());
-+ BUG_ON_NONRT(!irqs_disabled());
- spin_lock(q->queue_lock);
- }
-
- goto out;
-
- requeued:
-- BUG_ON(!irqs_disabled());
-+ BUG_ON_NONRT(!irqs_disabled());
- spin_lock(q->queue_lock);
-
- delay_and_out:
-Index: linux-stable/drivers/acpi/acpica/acglobal.h
-===================================================================
---- linux-stable.orig/drivers/acpi/acpica/acglobal.h
-+++ linux-stable/drivers/acpi/acpica/acglobal.h
-@@ -253,7 +253,7 @@ ACPI_EXTERN u8 acpi_gbl_global_lock_pend
- * interrupt level
- */
- ACPI_EXTERN acpi_spinlock acpi_gbl_gpe_lock; /* For GPE data structs and registers */
--ACPI_EXTERN acpi_spinlock acpi_gbl_hardware_lock; /* For ACPI H/W except GPE registers */
-+ACPI_EXTERN acpi_raw_spinlock acpi_gbl_hardware_lock; /* For ACPI H/W except GPE registers */
- ACPI_EXTERN acpi_spinlock acpi_gbl_reference_count_lock;
-
- /* Mutex for _OSI support */
-Index: linux-stable/drivers/acpi/acpica/hwregs.c
-===================================================================
---- linux-stable.orig/drivers/acpi/acpica/hwregs.c
-+++ linux-stable/drivers/acpi/acpica/hwregs.c
-@@ -269,14 +269,14 @@ acpi_status acpi_hw_clear_acpi_status(vo
- ACPI_BITMASK_ALL_FIXED_STATUS,
- ACPI_FORMAT_UINT64(acpi_gbl_xpm1a_status.address)));
-
-- lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
-+ raw_spin_lock_irqsave(acpi_gbl_hardware_lock, lock_flags);
-
- /* Clear the fixed events in PM1 A/B */
-
- status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
- ACPI_BITMASK_ALL_FIXED_STATUS);
-
-- acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
-+ raw_spin_unlock_irqrestore(acpi_gbl_hardware_lock, lock_flags);
-
- if (ACPI_FAILURE(status))
- goto exit;
-Index: linux-stable/drivers/acpi/acpica/hwxface.c
-===================================================================
---- linux-stable.orig/drivers/acpi/acpica/hwxface.c
-+++ linux-stable/drivers/acpi/acpica/hwxface.c
-@@ -374,7 +374,7 @@ acpi_status acpi_write_bit_register(u32
- return_ACPI_STATUS(AE_BAD_PARAMETER);
- }
-
-- lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
-+ raw_spin_lock_irqsave(acpi_gbl_hardware_lock, lock_flags);
-
- /*
- * At this point, we know that the parent register is one of the
-@@ -435,7 +435,7 @@ acpi_status acpi_write_bit_register(u32
-
- unlock_and_exit:
-
-- acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
-+ raw_spin_unlock_irqrestore(acpi_gbl_hardware_lock, lock_flags);
- return_ACPI_STATUS(status);
- }
-
-Index: linux-stable/drivers/acpi/acpica/utmutex.c
-===================================================================
---- linux-stable.orig/drivers/acpi/acpica/utmutex.c
-+++ linux-stable/drivers/acpi/acpica/utmutex.c
-@@ -88,7 +88,7 @@ acpi_status acpi_ut_mutex_initialize(voi
- return_ACPI_STATUS (status);
- }
-
-- status = acpi_os_create_lock (&acpi_gbl_hardware_lock);
-+ status = acpi_os_create_raw_lock (&acpi_gbl_hardware_lock);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
-@@ -141,7 +141,7 @@ void acpi_ut_mutex_terminate(void)
- /* Delete the spinlocks */
-
- acpi_os_delete_lock(acpi_gbl_gpe_lock);
-- acpi_os_delete_lock(acpi_gbl_hardware_lock);
-+ acpi_os_delete_raw_lock(acpi_gbl_hardware_lock);
- acpi_os_delete_lock(acpi_gbl_reference_count_lock);
-
- /* Delete the reader/writer lock */
-Index: linux-stable/include/acpi/platform/aclinux.h
-===================================================================
---- linux-stable.orig/include/acpi/platform/aclinux.h
-+++ linux-stable/include/acpi/platform/aclinux.h
-@@ -73,6 +73,7 @@
-
- #define acpi_cache_t struct kmem_cache
- #define acpi_spinlock spinlock_t *
-+#define acpi_raw_spinlock raw_spinlock_t *
- #define acpi_cpu_flags unsigned long
-
- #else /* !__KERNEL__ */
-@@ -210,6 +211,19 @@ static inline acpi_thread_id acpi_os_get
- })
- #define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_create_lock
-
-+#define acpi_os_create_raw_lock(__handle) \
-+({ \
-+ raw_spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock)); \
-+ \
-+ if (lock) { \
-+ *(__handle) = lock; \
-+ raw_spin_lock_init(*(__handle)); \
-+ } \
-+ lock ? AE_OK : AE_NO_MEMORY; \
-+})
-+
-+#define acpi_os_delete_raw_lock(__handle) kfree(__handle)
-+
- void __iomem *acpi_os_map_memory(acpi_physical_address where, acpi_size length);
- #define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_map_memory
-
-Index: linux-stable/lib/Kconfig
-===================================================================
---- linux-stable.orig/lib/Kconfig
-+++ linux-stable/lib/Kconfig
-@@ -357,6 +357,7 @@ config CHECK_SIGNATURE
-
- config CPUMASK_OFFSTACK
- bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
-+ depends on !PREEMPT_RT_FULL
- help
- Use dynamic allocation for cpumask_var_t, instead of putting
- them on the stack. This is a bit more expensive, but avoids
-Index: linux-stable/include/linux/irqdesc.h
-===================================================================
---- linux-stable.orig/include/linux/irqdesc.h
-+++ linux-stable/include/linux/irqdesc.h
-@@ -56,6 +56,7 @@ struct irq_desc {
- unsigned int irqs_unhandled;
- atomic_t threads_handled;
- int threads_handled_last;
-+ u64 random_ip;
- raw_spinlock_t lock;
- struct cpumask *percpu_enabled;
- #ifdef CONFIG_SMP
-Index: linux-stable/include/linux/random.h
-===================================================================
---- linux-stable.orig/include/linux/random.h
-+++ linux-stable/include/linux/random.h
-@@ -11,7 +11,7 @@
- extern void add_device_randomness(const void *, unsigned int);
- extern void add_input_randomness(unsigned int type, unsigned int code,
- unsigned int value);
--extern void add_interrupt_randomness(int irq, int irq_flags);
-+extern void add_interrupt_randomness(int irq, int irq_flags, __u64 ip);
-
- extern void get_random_bytes(void *buf, int nbytes);
- extern void get_random_bytes_arch(void *buf, int nbytes);
-Index: linux-stable/kernel/irq/handle.c
-===================================================================
---- linux-stable.orig/kernel/irq/handle.c
-+++ linux-stable/kernel/irq/handle.c
-@@ -132,6 +132,8 @@ static void irq_wake_thread(struct irq_d
- irqreturn_t
- handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action)
- {
-+ struct pt_regs *regs = get_irq_regs();
-+ u64 ip = regs ? instruction_pointer(regs) : 0;
- irqreturn_t retval = IRQ_NONE;
- unsigned int flags = 0, irq = desc->irq_data.irq;
-
-@@ -172,7 +174,11 @@ handle_irq_event_percpu(struct irq_desc
- action = action->next;
- } while (action);
-
-- add_interrupt_randomness(irq, flags);
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+ add_interrupt_randomness(irq, flags, ip);
-+#else
-+ desc->random_ip = ip;
-+#endif
-
- if (!noirqdebug)
- note_interrupt(irq, desc, retval);
-Index: linux-stable/include/linux/seqlock.h
-===================================================================
---- linux-stable.orig/include/linux/seqlock.h
-+++ linux-stable/include/linux/seqlock.h
-@@ -205,20 +205,30 @@ static inline int read_seqcount_retry(co
- return __read_seqcount_retry(s, start);
- }
-
--
--
--static inline void raw_write_seqcount_begin(seqcount_t *s)
-+static inline void __raw_write_seqcount_begin(seqcount_t *s)
- {
- s->sequence++;
- smp_wmb();
- }
-
--static inline void raw_write_seqcount_end(seqcount_t *s)
-+static inline void raw_write_seqcount_begin(seqcount_t *s)
-+{
-+ preempt_disable_rt();
-+ __raw_write_seqcount_begin(s);
-+}
-+
-+static inline void __raw_write_seqcount_end(seqcount_t *s)
- {
- smp_wmb();
- s->sequence++;
- }
-
-+static inline void raw_write_seqcount_end(seqcount_t *s)
-+{
-+ __raw_write_seqcount_end(s);
-+ preempt_enable_rt();
-+}
-+
- /*
- * Sequence counter only version assumes that callers are using their
- * own mutexing.
-@@ -280,10 +290,32 @@ typedef struct {
- /*
- * Read side functions for starting and finalizing a read side section.
- */
-+#ifndef CONFIG_PREEMPT_RT_FULL
- static inline unsigned read_seqbegin(const seqlock_t *sl)
- {
- return read_seqcount_begin(&sl->seqcount);
- }
-+#else
-+/*
-+ * Starvation safe read side for RT
-+ */
-+static inline unsigned read_seqbegin(seqlock_t *sl)
-+{
-+ unsigned ret;
-+
-+repeat:
-+ ret = ACCESS_ONCE(sl->seqcount.sequence);
-+ if (unlikely(ret & 1)) {
-+ /*
-+ * Take the lock and let the writer proceed (i.e. evtl
-+ * boost it), otherwise we could loop here forever.
-+ */
-+ spin_unlock_wait(&sl->lock);
-+ goto repeat;
-+ }
-+ return ret;
-+}
-+#endif
-
- static inline unsigned read_seqretry(const seqlock_t *sl, unsigned start)
- {
-@@ -298,36 +330,36 @@ static inline unsigned read_seqretry(con
- static inline void write_seqlock(seqlock_t *sl)
- {
- spin_lock(&sl->lock);
-- write_seqcount_begin(&sl->seqcount);
-+ __raw_write_seqcount_begin(&sl->seqcount);
- }
-
- static inline void write_sequnlock(seqlock_t *sl)
- {
-- write_seqcount_end(&sl->seqcount);
-+ __raw_write_seqcount_end(&sl->seqcount);
- spin_unlock(&sl->lock);
- }
-
- static inline void write_seqlock_bh(seqlock_t *sl)
- {
- spin_lock_bh(&sl->lock);
-- write_seqcount_begin(&sl->seqcount);
-+ __raw_write_seqcount_begin(&sl->seqcount);
- }
-
- static inline void write_sequnlock_bh(seqlock_t *sl)
- {
-- write_seqcount_end(&sl->seqcount);
-+ __raw_write_seqcount_end(&sl->seqcount);
- spin_unlock_bh(&sl->lock);
- }
-
- static inline void write_seqlock_irq(seqlock_t *sl)
- {
- spin_lock_irq(&sl->lock);
-- write_seqcount_begin(&sl->seqcount);
-+ __raw_write_seqcount_begin(&sl->seqcount);
- }
-
- static inline void write_sequnlock_irq(seqlock_t *sl)
- {
-- write_seqcount_end(&sl->seqcount);
-+ __raw_write_seqcount_end(&sl->seqcount);
- spin_unlock_irq(&sl->lock);
- }
-
-@@ -336,7 +368,7 @@ static inline unsigned long __write_seql
- unsigned long flags;
-
- spin_lock_irqsave(&sl->lock, flags);
-- write_seqcount_begin(&sl->seqcount);
-+ __raw_write_seqcount_begin(&sl->seqcount);
- return flags;
- }
-
-@@ -346,7 +378,7 @@ static inline unsigned long __write_seql
- static inline void
- write_sequnlock_irqrestore(seqlock_t *sl, unsigned long flags)
- {
-- write_seqcount_end(&sl->seqcount);
-+ __raw_write_seqcount_end(&sl->seqcount);
- spin_unlock_irqrestore(&sl->lock, flags);
- }
-
-Index: linux-stable/include/net/dst.h
-===================================================================
---- linux-stable.orig/include/net/dst.h
-+++ linux-stable/include/net/dst.h
-@@ -393,7 +393,7 @@ static inline void dst_confirm(struct ds
- static inline int dst_neigh_output(struct dst_entry *dst, struct neighbour *n,
- struct sk_buff *skb)
- {
-- const struct hh_cache *hh;
-+ struct hh_cache *hh;
-
- if (dst->pending_confirm) {
- unsigned long now = jiffies;
-Index: linux-stable/include/net/neighbour.h
-===================================================================
---- linux-stable.orig/include/net/neighbour.h
-+++ linux-stable/include/net/neighbour.h
-@@ -388,7 +388,7 @@ static inline int neigh_hh_bridge(struct
- }
- #endif
-
--static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff *skb)
-+static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb)
- {
- unsigned int seq;
- int hh_len;
-@@ -443,7 +443,7 @@ struct neighbour_cb {
-
- #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)
-
--static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n,
-+static inline void neigh_ha_snapshot(char *dst, struct neighbour *n,
- const struct net_device *dev)
- {
- unsigned int seq;
-Index: linux-stable/drivers/scsi/qla2xxx/qla_inline.h
-===================================================================
---- linux-stable.orig/drivers/scsi/qla2xxx/qla_inline.h
-+++ linux-stable/drivers/scsi/qla2xxx/qla_inline.h
-@@ -58,12 +58,12 @@ qla2x00_poll(struct rsp_que *rsp)
- {
- unsigned long flags;
- struct qla_hw_data *ha = rsp->hw;
-- local_irq_save(flags);
-+ local_irq_save_nort(flags);
- if (IS_P3P_TYPE(ha))
- qla82xx_poll(0, rsp);
- else
- ha->isp_ops->intr_handler(0, rsp);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- }
-
- static inline uint8_t *
-Index: linux-stable/net/core/skbuff.c
-===================================================================
---- linux-stable.orig/net/core/skbuff.c
-+++ linux-stable/net/core/skbuff.c
-@@ -62,6 +62,7 @@
- #include <linux/scatterlist.h>
- #include <linux/errqueue.h>
- #include <linux/prefetch.h>
-+#include <linux/locallock.h>
-
- #include <net/protocol.h>
- #include <net/dst.h>
-@@ -335,6 +336,7 @@ struct netdev_alloc_cache {
- unsigned int pagecnt_bias;
- };
- static DEFINE_PER_CPU(struct netdev_alloc_cache, netdev_alloc_cache);
-+static DEFINE_LOCAL_IRQ_LOCK(netdev_alloc_lock);
-
- static void *__netdev_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
- {
-@@ -343,7 +345,7 @@ static void *__netdev_alloc_frag(unsigne
- int order;
- unsigned long flags;
-
-- local_irq_save(flags);
-+ local_lock_irqsave(netdev_alloc_lock, flags);
- nc = &__get_cpu_var(netdev_alloc_cache);
- if (unlikely(!nc->frag.page)) {
- refill:
-@@ -377,7 +379,7 @@ recycle:
- nc->frag.offset += fragsz;
- nc->pagecnt_bias--;
- end:
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(netdev_alloc_lock, flags);
- return data;
- }
-
-Index: linux-stable/net/ipv4/ip_output.c
-===================================================================
---- linux-stable.orig/net/ipv4/ip_output.c
-+++ linux-stable/net/ipv4/ip_output.c
-@@ -79,6 +79,7 @@
- #include <linux/mroute.h>
- #include <linux/netlink.h>
- #include <linux/tcp.h>
-+#include <linux/locallock.h>
-
- int sysctl_ip_default_ttl __read_mostly = IPDEFTTL;
- EXPORT_SYMBOL(sysctl_ip_default_ttl);
-@@ -1477,6 +1478,9 @@ static DEFINE_PER_CPU(struct inet_sock,
- .uc_ttl = -1,
- };
-
-+/* serialize concurrent calls on the same CPU to ip_send_unicast_reply */
-+static DEFINE_LOCAL_IRQ_LOCK(unicast_lock);
-+
- void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr,
- __be32 saddr, const struct ip_reply_arg *arg,
- unsigned int len)
-@@ -1516,7 +1520,7 @@ void ip_send_unicast_reply(struct net *n
- if (IS_ERR(rt))
- return;
-
-- inet = &get_cpu_var(unicast_sock);
-+ inet = &get_locked_var(unicast_lock, unicast_sock);
-
- inet->tos = arg->tos;
- sk = &inet->sk;
-@@ -1540,7 +1544,7 @@ void ip_send_unicast_reply(struct net *n
- ip_push_pending_frames(sk, &fl4);
- }
-
-- put_cpu_var(unicast_sock);
-+ put_locked_var(unicast_lock, unicast_sock);
-
- ip_rt_put(rt);
- }
-Index: linux-stable/include/linux/netfilter/x_tables.h
-===================================================================
---- linux-stable.orig/include/linux/netfilter/x_tables.h
-+++ linux-stable/include/linux/netfilter/x_tables.h
-@@ -3,6 +3,7 @@
-
-
- #include <linux/netdevice.h>
-+#include <linux/locallock.h>
- #include <uapi/linux/netfilter/x_tables.h>
-
- /**
-@@ -282,6 +283,8 @@ void xt_free_table_info(struct xt_table_
- */
- DECLARE_PER_CPU(seqcount_t, xt_recseq);
-
-+DECLARE_LOCAL_IRQ_LOCK(xt_write_lock);
-+
- /**
- * xt_write_recseq_begin - start of a write section
- *
-@@ -296,6 +299,9 @@ static inline unsigned int xt_write_recs
- {
- unsigned int addend;
-
-+ /* RT protection */
-+ local_lock(xt_write_lock);
-+
- /*
- * Low order bit of sequence is set if we already
- * called xt_write_recseq_begin().
-@@ -326,6 +332,7 @@ static inline void xt_write_recseq_end(u
- /* this is kind of a write_seqcount_end(), but addend is 0 or 1 */
- smp_wmb();
- __this_cpu_add(xt_recseq.sequence, addend);
-+ local_unlock(xt_write_lock);
- }
-
- /*
-Index: linux-stable/net/netfilter/core.c
-===================================================================
---- linux-stable.orig/net/netfilter/core.c
-+++ linux-stable/net/netfilter/core.c
-@@ -21,11 +21,17 @@
- #include <linux/proc_fs.h>
- #include <linux/mutex.h>
- #include <linux/slab.h>
-+#include <linux/locallock.h>
- #include <net/net_namespace.h>
- #include <net/sock.h>
-
- #include "nf_internals.h"
-
-+#ifdef CONFIG_PREEMPT_RT_BASE
-+DEFINE_LOCAL_IRQ_LOCK(xt_write_lock);
-+EXPORT_PER_CPU_SYMBOL(xt_write_lock);
-+#endif
-+
- static DEFINE_MUTEX(afinfo_mutex);
-
- const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO] __read_mostly;
-Index: linux-stable/crypto/algapi.c
-===================================================================
---- linux-stable.orig/crypto/algapi.c
-+++ linux-stable/crypto/algapi.c
-@@ -684,13 +684,13 @@ EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
-
- int crypto_register_notifier(struct notifier_block *nb)
- {
-- return blocking_notifier_chain_register(&crypto_chain, nb);
-+ return srcu_notifier_chain_register(&crypto_chain, nb);
- }
- EXPORT_SYMBOL_GPL(crypto_register_notifier);
-
- int crypto_unregister_notifier(struct notifier_block *nb)
- {
-- return blocking_notifier_chain_unregister(&crypto_chain, nb);
-+ return srcu_notifier_chain_unregister(&crypto_chain, nb);
- }
- EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
-
-Index: linux-stable/crypto/api.c
-===================================================================
---- linux-stable.orig/crypto/api.c
-+++ linux-stable/crypto/api.c
-@@ -31,7 +31,7 @@ EXPORT_SYMBOL_GPL(crypto_alg_list);
- DECLARE_RWSEM(crypto_alg_sem);
- EXPORT_SYMBOL_GPL(crypto_alg_sem);
-
--BLOCKING_NOTIFIER_HEAD(crypto_chain);
-+SRCU_NOTIFIER_HEAD(crypto_chain);
- EXPORT_SYMBOL_GPL(crypto_chain);
-
- static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg);
-@@ -236,10 +236,10 @@ int crypto_probing_notify(unsigned long
- {
- int ok;
-
-- ok = blocking_notifier_call_chain(&crypto_chain, val, v);
-+ ok = srcu_notifier_call_chain(&crypto_chain, val, v);
- if (ok == NOTIFY_DONE) {
- request_module("cryptomgr");
-- ok = blocking_notifier_call_chain(&crypto_chain, val, v);
-+ ok = srcu_notifier_call_chain(&crypto_chain, val, v);
- }
-
- return ok;
-Index: linux-stable/crypto/internal.h
-===================================================================
---- linux-stable.orig/crypto/internal.h
-+++ linux-stable/crypto/internal.h
-@@ -48,7 +48,7 @@ struct crypto_larval {
-
- extern struct list_head crypto_alg_list;
- extern struct rw_semaphore crypto_alg_sem;
--extern struct blocking_notifier_head crypto_chain;
-+extern struct srcu_notifier_head crypto_chain;
-
- #ifdef CONFIG_PROC_FS
- void __init crypto_init_proc(void);
-@@ -142,7 +142,7 @@ static inline int crypto_is_moribund(str
-
- static inline void crypto_notify(unsigned long val, void *v)
- {
-- blocking_notifier_call_chain(&crypto_chain, val, v);
-+ srcu_notifier_call_chain(&crypto_chain, val, v);
- }
-
- #endif /* _CRYPTO_INTERNAL_H */
-Index: linux-stable/lib/locking-selftest.c
-===================================================================
---- linux-stable.orig/lib/locking-selftest.c
-+++ linux-stable/lib/locking-selftest.c
-@@ -1858,6 +1858,7 @@ void locking_selftest(void)
-
- printk(" --------------------------------------------------------------------------\n");
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * irq-context testcases:
- */
-@@ -1870,6 +1871,28 @@ void locking_selftest(void)
-
- DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion);
- // DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2);
-+#else
-+ /* On -rt, we only do hardirq context test for raw spinlock */
-+ DO_TESTCASE_1B("hard-irqs-on + irq-safe-A", irqsafe1_hard_spin, 12);
-+ DO_TESTCASE_1B("hard-irqs-on + irq-safe-A", irqsafe1_hard_spin, 21);
-+
-+ DO_TESTCASE_1B("hard-safe-A + irqs-on", irqsafe2B_hard_spin, 12);
-+ DO_TESTCASE_1B("hard-safe-A + irqs-on", irqsafe2B_hard_spin, 21);
-+
-+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 123);
-+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 132);
-+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 213);
-+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 231);
-+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 312);
-+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 321);
-+
-+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 123);
-+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 132);
-+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 213);
-+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 231);
-+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 312);
-+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 321);
-+#endif
-
- ww_tests();
-
-Index: linux-stable/kernel/events/core.c
-===================================================================
---- linux-stable.orig/kernel/events/core.c
-+++ linux-stable/kernel/events/core.c
-@@ -6108,6 +6108,7 @@ static void perf_swevent_init_hrtimer(st
-
- hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- hwc->hrtimer.function = perf_swevent_hrtimer;
-+ hwc->hrtimer.irqsafe = 1;
-
- /*
- * Since hrtimers have a fixed rate, we can do a static freq->period
-Index: linux-stable/block/blk-iopoll.c
-===================================================================
---- linux-stable.orig/block/blk-iopoll.c
-+++ linux-stable/block/blk-iopoll.c
-@@ -38,6 +38,7 @@ void blk_iopoll_sched(struct blk_iopoll
- list_add_tail(&iop->list, this_cpu_ptr(&blk_cpu_iopoll));
- __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);
- local_irq_restore(flags);
-+ preempt_check_resched_rt();
- }
- EXPORT_SYMBOL(blk_iopoll_sched);
-
-@@ -135,6 +136,7 @@ static void blk_iopoll_softirq(struct so
- __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);
-
- local_irq_enable();
-+ preempt_check_resched_rt();
- }
-
- /**
-@@ -204,6 +206,7 @@ static int blk_iopoll_cpu_notify(struct
- this_cpu_ptr(&blk_cpu_iopoll));
- __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);
- local_irq_enable();
-+ preempt_check_resched_rt();
- }
-
- return NOTIFY_OK;
-Index: linux-stable/block/blk-softirq.c
-===================================================================
---- linux-stable.orig/block/blk-softirq.c
-+++ linux-stable/block/blk-softirq.c
-@@ -51,6 +51,7 @@ static void trigger_softirq(void *data)
- raise_softirq_irqoff(BLOCK_SOFTIRQ);
-
- local_irq_restore(flags);
-+ preempt_check_resched_rt();
- }
-
- /*
-@@ -93,6 +94,7 @@ static int blk_cpu_notify(struct notifie
- this_cpu_ptr(&blk_cpu_done));
- raise_softirq_irqoff(BLOCK_SOFTIRQ);
- local_irq_enable();
-+ preempt_check_resched_rt();
- }
-
- return NOTIFY_OK;
-@@ -150,6 +152,7 @@ do_local:
- goto do_local;
-
- local_irq_restore(flags);
-+ preempt_check_resched_rt();
- }
-
- /**
-Index: linux-stable/kernel/rcu/tree.h
-===================================================================
---- linux-stable.orig/kernel/rcu/tree.h
-+++ linux-stable/kernel/rcu/tree.h
-@@ -28,6 +28,7 @@
- #include <linux/cpumask.h>
- #include <linux/seqlock.h>
- #include <linux/irq_work.h>
-+#include <linux/wait-simple.h>
-
- /*
- * Define shape of hierarchy based on NR_CPUS, CONFIG_RCU_FANOUT, and
-@@ -200,7 +201,7 @@ struct rcu_node {
- /* This can happen due to race conditions. */
- #endif /* #ifdef CONFIG_RCU_BOOST */
- #ifdef CONFIG_RCU_NOCB_CPU
-- wait_queue_head_t nocb_gp_wq[2];
-+ struct swait_head nocb_gp_wq[2];
- /* Place for rcu_nocb_kthread() to wait GP. */
- #endif /* #ifdef CONFIG_RCU_NOCB_CPU */
- int need_future_gp[2];
-@@ -334,7 +335,7 @@ struct rcu_data {
- atomic_long_t nocb_q_count_lazy; /* (approximate). */
- int nocb_p_count; /* # CBs being invoked by kthread */
- int nocb_p_count_lazy; /* (approximate). */
-- wait_queue_head_t nocb_wq; /* For nocb kthreads to sleep on. */
-+ struct swait_head nocb_wq; /* For nocb kthreads to sleep on. */
- struct task_struct *nocb_kthread;
- bool nocb_defer_wakeup; /* Defer wakeup of nocb_kthread. */
- #endif /* #ifdef CONFIG_RCU_NOCB_CPU */
-@@ -405,7 +406,7 @@ struct rcu_state {
- unsigned long gpnum; /* Current gp number. */
- unsigned long completed; /* # of last completed gp. */
- struct task_struct *gp_kthread; /* Task for grace periods. */
-- wait_queue_head_t gp_wq; /* Where GP task waits. */
-+ struct swait_head gp_wq; /* Where GP task waits. */
- int gp_flags; /* Commands for GP task. */
-
- /* End of fields guarded by root rcu_node's lock. */
-@@ -531,10 +532,9 @@ static void rcu_report_exp_rnp(struct rc
- static void __init __rcu_init_preempt(void);
- static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags);
- static void rcu_preempt_boost_start_gp(struct rcu_node *rnp);
--static void invoke_rcu_callbacks_kthread(void);
- static bool rcu_is_callbacks_kthread(void);
-+static void rcu_cpu_kthread_setup(unsigned int cpu);
- #ifdef CONFIG_RCU_BOOST
--static void rcu_preempt_do_callbacks(void);
- static int rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
- struct rcu_node *rnp);
- #endif /* #ifdef CONFIG_RCU_BOOST */
-Index: linux-stable/arch/x86/include/asm/preempt.h
-===================================================================
---- linux-stable.orig/arch/x86/include/asm/preempt.h
-+++ linux-stable/arch/x86/include/asm/preempt.h
-@@ -97,17 +97,33 @@ static __always_inline void __preempt_co
- * a decrement which hits zero means we have no preempt_count and should
- * reschedule.
- */
--static __always_inline bool __preempt_count_dec_and_test(void)
-+static __always_inline bool ____preempt_count_dec_and_test(void)
- {
- GEN_UNARY_RMWcc("decl", __preempt_count, __percpu_arg(0), "e");
- }
-
-+static __always_inline bool __preempt_count_dec_and_test(void)
-+{
-+ if (____preempt_count_dec_and_test())
-+ return true;
-+#ifdef CONFIG_PREEMPT_LAZY
-+ return test_thread_flag(TIF_NEED_RESCHED_LAZY);
-+#else
-+ return false;
-+#endif
-+}
-+
- /*
- * Returns true when we need to resched and can (barring IRQ state).
- */
- static __always_inline bool should_resched(void)
- {
-+#ifdef CONFIG_PREEMPT_LAZY
-+ return unlikely(!__this_cpu_read_4(__preempt_count) || \
-+ test_thread_flag(TIF_NEED_RESCHED_LAZY));
-+#else
- return unlikely(!__this_cpu_read_4(__preempt_count));
-+#endif
- }
-
- #ifdef CONFIG_PREEMPT
-Index: linux-stable/kernel/sched/fair.c
-===================================================================
---- linux-stable.orig/kernel/sched/fair.c
-+++ linux-stable/kernel/sched/fair.c
-@@ -2679,7 +2679,7 @@ check_preempt_tick(struct cfs_rq *cfs_rq
- ideal_runtime = sched_slice(cfs_rq, curr);
- delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime;
- if (delta_exec > ideal_runtime) {
-- resched_task(rq_of(cfs_rq)->curr);
-+ resched_task_lazy(rq_of(cfs_rq)->curr);
- /*
- * The current task ran long enough, ensure it doesn't get
- * re-elected due to buddy favours.
-@@ -2703,7 +2703,7 @@ check_preempt_tick(struct cfs_rq *cfs_rq
- return;
-
- if (delta > ideal_runtime)
-- resched_task(rq_of(cfs_rq)->curr);
-+ resched_task_lazy(rq_of(cfs_rq)->curr);
- }
-
- static void
-@@ -2824,7 +2824,7 @@ entity_tick(struct cfs_rq *cfs_rq, struc
- * validating it and just reschedule.
- */
- if (queued) {
-- resched_task(rq_of(cfs_rq)->curr);
-+ resched_task_lazy(rq_of(cfs_rq)->curr);
- return;
- }
- /*
-@@ -3013,7 +3013,7 @@ static void __account_cfs_rq_runtime(str
- * hierarchy can be throttled
- */
- if (!assign_cfs_rq_runtime(cfs_rq) && likely(cfs_rq->curr))
-- resched_task(rq_of(cfs_rq)->curr);
-+ resched_task_lazy(rq_of(cfs_rq)->curr);
- }
-
- static __always_inline
-@@ -3612,7 +3612,7 @@ static void hrtick_start_fair(struct rq
-
- if (delta < 0) {
- if (rq->curr == p)
-- resched_task(p);
-+ resched_task_lazy(p);
- return;
- }
-
-@@ -4477,7 +4477,7 @@ static void check_preempt_wakeup(struct
- return;
-
- preempt:
-- resched_task(curr);
-+ resched_task_lazy(curr);
- /*
- * Only set the backward buddy when the current task is still
- * on the rq. This can happen when a wakeup gets interleaved
-@@ -6965,7 +6965,7 @@ static void task_fork_fair(struct task_s
- * 'current' within the tree based on its new key value.
- */
- swap(curr->vruntime, se->vruntime);
-- resched_task(rq->curr);
-+ resched_task_lazy(rq->curr);
- }
-
- se->vruntime -= cfs_rq->min_vruntime;
-@@ -6990,7 +6990,7 @@ prio_changed_fair(struct rq *rq, struct
- */
- if (rq->curr == p) {
- if (p->prio > oldprio)
-- resched_task(rq->curr);
-+ resched_task_lazy(rq->curr);
- } else
- check_preempt_curr(rq, p, 0);
- }
-Index: linux-stable/kernel/trace/trace.h
-===================================================================
---- linux-stable.orig/kernel/trace/trace.h
-+++ linux-stable/kernel/trace/trace.h
-@@ -118,6 +118,7 @@ struct kretprobe_trace_entry_head {
- * NEED_RESCHED - reschedule is requested
- * HARDIRQ - inside an interrupt handler
- * SOFTIRQ - inside a softirq handler
-+ * NEED_RESCHED_LAZY - lazy reschedule is requested
- */
- enum trace_flag_type {
- TRACE_FLAG_IRQS_OFF = 0x01,
-@@ -126,6 +127,7 @@ enum trace_flag_type {
- TRACE_FLAG_HARDIRQ = 0x08,
- TRACE_FLAG_SOFTIRQ = 0x10,
- TRACE_FLAG_PREEMPT_RESCHED = 0x20,
-+ TRACE_FLAG_NEED_RESCHED_LAZY = 0x40,
- };
-
- #define TRACE_BUF_SIZE 1024
-Index: linux-stable/arch/x86/include/asm/thread_info.h
-===================================================================
---- linux-stable.orig/arch/x86/include/asm/thread_info.h
-+++ linux-stable/arch/x86/include/asm/thread_info.h
-@@ -29,6 +29,8 @@ struct thread_info {
- __u32 status; /* thread synchronous flags */
- __u32 cpu; /* current CPU */
- int saved_preempt_count;
-+ int preempt_lazy_count; /* 0 => lazy preemptable
-+ <0 => BUG */
- mm_segment_t addr_limit;
- struct restart_block restart_block;
- void __user *sysenter_return;
-@@ -80,6 +82,7 @@ struct thread_info {
- #define TIF_SYSCALL_EMU 6 /* syscall emulation active */
- #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
- #define TIF_SECCOMP 8 /* secure computing */
-+#define TIF_NEED_RESCHED_LAZY 9 /* lazy rescheduling necessary */
- #define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */
- #define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */
- #define TIF_UPROBE 12 /* breakpointed or singlestepping */
-@@ -104,6 +107,7 @@ struct thread_info {
- #define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU)
- #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
- #define _TIF_SECCOMP (1 << TIF_SECCOMP)
-+#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY)
- #define _TIF_MCE_NOTIFY (1 << TIF_MCE_NOTIFY)
- #define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY)
- #define _TIF_UPROBE (1 << TIF_UPROBE)
-@@ -153,6 +157,8 @@ struct thread_info {
- #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY)
- #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW)
-
-+#define _TIF_NEED_RESCHED_MASK (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)
-+
- #ifdef CONFIG_X86_32
-
- #define STACK_WARN (THREAD_SIZE/8)
-Index: linux-stable/arch/x86/kernel/asm-offsets.c
-===================================================================
---- linux-stable.orig/arch/x86/kernel/asm-offsets.c
-+++ linux-stable/arch/x86/kernel/asm-offsets.c
-@@ -32,6 +32,7 @@ void common(void) {
- OFFSET(TI_flags, thread_info, flags);
- OFFSET(TI_status, thread_info, status);
- OFFSET(TI_addr_limit, thread_info, addr_limit);
-+ OFFSET(TI_preempt_lazy_count, thread_info, preempt_lazy_count);
-
- BLANK();
- OFFSET(crypto_tfm_ctx_offset, crypto_tfm, __crt_ctx);
-@@ -71,4 +72,5 @@ void common(void) {
-
- BLANK();
- DEFINE(PTREGS_SIZE, sizeof(struct pt_regs));
-+ DEFINE(_PREEMPT_ENABLED, PREEMPT_ENABLED);
- }
-Index: linux-stable/arch/x86/kernel/entry_32.S
-===================================================================
---- linux-stable.orig/arch/x86/kernel/entry_32.S
-+++ linux-stable/arch/x86/kernel/entry_32.S
-@@ -363,8 +363,24 @@ END(ret_from_exception)
- ENTRY(resume_kernel)
- DISABLE_INTERRUPTS(CLBR_ANY)
- need_resched:
-+ # preempt count == 0 + NEED_RS set?
- cmpl $0,PER_CPU_VAR(__preempt_count)
-+#ifndef CONFIG_PREEMPT_LAZY
- jnz restore_all
-+#else
-+ jz test_int_off
-+
-+ # atleast preempt count == 0 ?
-+ cmpl $_PREEMPT_ENABLED,PER_CPU_VAR(__preempt_count)
-+ jne restore_all
-+
-+ cmpl $0,TI_preempt_lazy_count(%ebp) # non-zero preempt_lazy_count ?
-+ jnz restore_all
-+
-+ testl $_TIF_NEED_RESCHED_LAZY, TI_flags(%ebp)
-+ jz restore_all
-+test_int_off:
-+#endif
- testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off (exception path) ?
- jz restore_all
- call preempt_schedule_irq
-@@ -600,7 +616,7 @@ ENDPROC(system_call)
- ALIGN
- RING0_PTREGS_FRAME # can't unwind into user space anyway
- work_pending:
-- testb $_TIF_NEED_RESCHED, %cl
-+ testl $_TIF_NEED_RESCHED_MASK, %ecx
- jz work_notifysig
- work_resched:
- call schedule
-@@ -613,7 +629,7 @@ work_resched:
- andl $_TIF_WORK_MASK, %ecx # is there any work to be done other
- # than syscall tracing?
- jz restore_all
-- testb $_TIF_NEED_RESCHED, %cl
-+ testl $_TIF_NEED_RESCHED_MASK, %ecx
- jnz work_resched
-
- work_notifysig: # deal with pending signals and
-Index: linux-stable/arch/arm/include/asm/thread_info.h
-===================================================================
---- linux-stable.orig/arch/arm/include/asm/thread_info.h
-+++ linux-stable/arch/arm/include/asm/thread_info.h
-@@ -60,6 +60,7 @@ struct arm_restart_block {
- struct thread_info {
- unsigned long flags; /* low level flags */
- int preempt_count; /* 0 => preemptable, <0 => bug */
-+ int preempt_lazy_count; /* 0 => preemptable, <0 => bug */
- mm_segment_t addr_limit; /* address limit */
- struct task_struct *task; /* main task structure */
- struct exec_domain *exec_domain; /* execution domain */
-@@ -153,6 +154,7 @@ extern int vfp_restore_user_hwstate(stru
- #define TIF_SIGPENDING 0
- #define TIF_NEED_RESCHED 1
- #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
-+#define TIF_NEED_RESCHED_LAZY 3
- #define TIF_SYSCALL_TRACE 8
- #define TIF_SYSCALL_AUDIT 9
- #define TIF_SYSCALL_TRACEPOINT 10
-@@ -165,6 +167,7 @@ extern int vfp_restore_user_hwstate(stru
- #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
- #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
- #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
-+#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY)
- #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
- #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
- #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
-Index: linux-stable/arch/arm/kernel/asm-offsets.c
-===================================================================
---- linux-stable.orig/arch/arm/kernel/asm-offsets.c
-+++ linux-stable/arch/arm/kernel/asm-offsets.c
-@@ -54,6 +54,7 @@ int main(void)
- BLANK();
- DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
- DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
-+ DEFINE(TI_PREEMPT_LAZY, offsetof(struct thread_info, preempt_lazy_count));
- DEFINE(TI_ADDR_LIMIT, offsetof(struct thread_info, addr_limit));
- DEFINE(TI_TASK, offsetof(struct thread_info, task));
- DEFINE(TI_EXEC_DOMAIN, offsetof(struct thread_info, exec_domain));
-Index: linux-stable/arch/arm/kernel/entry-armv.S
-===================================================================
---- linux-stable.orig/arch/arm/kernel/entry-armv.S
-+++ linux-stable/arch/arm/kernel/entry-armv.S
-@@ -205,11 +205,18 @@ __irq_svc:
- #ifdef CONFIG_PREEMPT
- get_thread_info tsk
- ldr r8, [tsk, #TI_PREEMPT] @ get preempt count
-- ldr r0, [tsk, #TI_FLAGS] @ get flags
- teq r8, #0 @ if preempt count != 0
-+ bne 1f @ return from exeption
-+ ldr r0, [tsk, #TI_FLAGS] @ get flags
-+ tst r0, #_TIF_NEED_RESCHED @ if NEED_RESCHED is set
-+ blne svc_preempt @ preempt!
-+
-+ ldr r8, [tsk, #TI_PREEMPT_LAZY] @ get preempt lazy count
-+ teq r8, #0 @ if preempt lazy count != 0
- movne r0, #0 @ force flags to 0
-- tst r0, #_TIF_NEED_RESCHED
-+ tst r0, #_TIF_NEED_RESCHED_LAZY
- blne svc_preempt
-+1:
- #endif
-
- svc_exit r5, irq = 1 @ return from exception
-@@ -224,6 +231,8 @@ svc_preempt:
- 1: bl preempt_schedule_irq @ irq en/disable is done inside
- ldr r0, [tsk, #TI_FLAGS] @ get new tasks TI_FLAGS
- tst r0, #_TIF_NEED_RESCHED
-+ bne 1b
-+ tst r0, #_TIF_NEED_RESCHED_LAZY
- moveq pc, r8 @ go again
- b 1b
- #endif
-Index: linux-stable/arch/arm/kernel/signal.c
-===================================================================
---- linux-stable.orig/arch/arm/kernel/signal.c
-+++ linux-stable/arch/arm/kernel/signal.c
-@@ -573,7 +573,8 @@ asmlinkage int
- do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
- {
- do {
-- if (likely(thread_flags & _TIF_NEED_RESCHED)) {
-+ if (likely(thread_flags & (_TIF_NEED_RESCHED |
-+ _TIF_NEED_RESCHED_LAZY))) {
- schedule();
- } else {
- if (unlikely(!user_mode(regs)))
-Index: linux-stable/arch/powerpc/include/asm/thread_info.h
-===================================================================
---- linux-stable.orig/arch/powerpc/include/asm/thread_info.h
-+++ linux-stable/arch/powerpc/include/asm/thread_info.h
-@@ -43,6 +43,8 @@ struct thread_info {
- int cpu; /* cpu we're on */
- int preempt_count; /* 0 => preemptable,
- <0 => BUG */
-+ int preempt_lazy_count; /* 0 => preemptable,
-+ <0 => BUG */
- struct restart_block restart_block;
- unsigned long local_flags; /* private flags for thread */
-
-@@ -88,8 +90,7 @@ static inline struct thread_info *curren
- #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
- #define TIF_SIGPENDING 1 /* signal pending */
- #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
--#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
-- TIF_NEED_RESCHED */
-+#define TIF_NEED_RESCHED_LAZY 3 /* lazy rescheduling necessary */
- #define TIF_32BIT 4 /* 32 bit binary */
- #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */
- #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
-@@ -107,6 +108,8 @@ static inline struct thread_info *curren
- #if defined(CONFIG_PPC64)
- #define TIF_ELF2ABI 18 /* function descriptors must die! */
- #endif
-+#define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling
-+ TIF_NEED_RESCHED */
-
- /* as above, but as bit values */
- #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
-@@ -125,14 +128,16 @@ static inline struct thread_info *curren
- #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
- #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
- #define _TIF_NOHZ (1<<TIF_NOHZ)
-+#define _TIF_NEED_RESCHED_LAZY (1<<TIF_NEED_RESCHED_LAZY)
- #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
- _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
- _TIF_NOHZ)
-
- #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
- _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
-- _TIF_RESTORE_TM)
-+ _TIF_RESTORE_TM | _TIF_NEED_RESCHED_LAZY)
- #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
-+#define _TIF_NEED_RESCHED_MASK (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)
-
- /* Bits in local_flags */
- /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
-Index: linux-stable/arch/powerpc/kernel/asm-offsets.c
-===================================================================
---- linux-stable.orig/arch/powerpc/kernel/asm-offsets.c
-+++ linux-stable/arch/powerpc/kernel/asm-offsets.c
-@@ -158,6 +158,7 @@ int main(void)
- DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
- DEFINE(TI_LOCAL_FLAGS, offsetof(struct thread_info, local_flags));
- DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
-+ DEFINE(TI_PREEMPT_LAZY, offsetof(struct thread_info, preempt_lazy_count));
- DEFINE(TI_TASK, offsetof(struct thread_info, task));
- DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
-
-Index: linux-stable/arch/powerpc/kernel/entry_32.S
-===================================================================
---- linux-stable.orig/arch/powerpc/kernel/entry_32.S
-+++ linux-stable/arch/powerpc/kernel/entry_32.S
-@@ -890,7 +890,14 @@ resume_kernel:
- cmpwi 0,r0,0 /* if non-zero, just restore regs and return */
- bne restore
- andi. r8,r8,_TIF_NEED_RESCHED
-+ bne+ 1f
-+ lwz r0,TI_PREEMPT_LAZY(r9)
-+ cmpwi 0,r0,0 /* if non-zero, just restore regs and return */
-+ bne restore
-+ lwz r0,TI_FLAGS(r9)
-+ andi. r0,r0,_TIF_NEED_RESCHED_LAZY
- beq+ restore
-+1:
- lwz r3,_MSR(r1)
- andi. r0,r3,MSR_EE /* interrupts off? */
- beq restore /* don't schedule if so */
-@@ -901,11 +908,11 @@ resume_kernel:
- */
- bl trace_hardirqs_off
- #endif
--1: bl preempt_schedule_irq
-+2: bl preempt_schedule_irq
- CURRENT_THREAD_INFO(r9, r1)
- lwz r3,TI_FLAGS(r9)
-- andi. r0,r3,_TIF_NEED_RESCHED
-- bne- 1b
-+ andi. r0,r3,_TIF_NEED_RESCHED_MASK
-+ bne- 2b
- #ifdef CONFIG_TRACE_IRQFLAGS
- /* And now, to properly rebalance the above, we tell lockdep they
- * are being turned back on, which will happen when we return
-@@ -1226,7 +1233,7 @@ global_dbcr0:
- #endif /* !(CONFIG_4xx || CONFIG_BOOKE) */
-
- do_work: /* r10 contains MSR_KERNEL here */
-- andi. r0,r9,_TIF_NEED_RESCHED
-+ andi. r0,r9,_TIF_NEED_RESCHED_MASK
- beq do_user_signal
-
- do_resched: /* r10 contains MSR_KERNEL here */
-@@ -1247,7 +1254,7 @@ recheck:
- MTMSRD(r10) /* disable interrupts */
- CURRENT_THREAD_INFO(r9, r1)
- lwz r9,TI_FLAGS(r9)
-- andi. r0,r9,_TIF_NEED_RESCHED
-+ andi. r0,r9,_TIF_NEED_RESCHED_MASK
- bne- do_resched
- andi. r0,r9,_TIF_USER_WORK_MASK
- beq restore_user
-Index: linux-stable/arch/powerpc/kernel/entry_64.S
-===================================================================
---- linux-stable.orig/arch/powerpc/kernel/entry_64.S
-+++ linux-stable/arch/powerpc/kernel/entry_64.S
-@@ -659,7 +659,7 @@ _GLOBAL(ret_from_except_lite)
- #else
- beq restore
- #endif
--1: andi. r0,r4,_TIF_NEED_RESCHED
-+1: andi. r0,r4,_TIF_NEED_RESCHED_MASK
- beq 2f
- bl .restore_interrupts
- SCHEDULE_USER
-@@ -715,10 +715,18 @@ resume_kernel:
-
- #ifdef CONFIG_PREEMPT
- /* Check if we need to preempt */
-+ lwz r8,TI_PREEMPT(r9)
-+ cmpwi 0,r8,0 /* if non-zero, just restore regs and return */
-+ bne restore
- andi. r0,r4,_TIF_NEED_RESCHED
-+ bne+ check_count
-+
-+ andi. r0,r4,_TIF_NEED_RESCHED_LAZY
- beq+ restore
-+ lwz r8,TI_PREEMPT_LAZY(r9)
-+
- /* Check that preempt_count() == 0 and interrupts are enabled */
-- lwz r8,TI_PREEMPT(r9)
-+check_count:
- cmpwi cr1,r8,0
- ld r0,SOFTE(r1)
- cmpdi r0,0
-@@ -735,7 +743,7 @@ resume_kernel:
- /* Re-test flags and eventually loop */
- CURRENT_THREAD_INFO(r9, r1)
- ld r4,TI_FLAGS(r9)
-- andi. r0,r4,_TIF_NEED_RESCHED
-+ andi. r0,r4,_TIF_NEED_RESCHED_MASK
- bne 1b
-
- /*
-Index: linux-stable/drivers/leds/trigger/Kconfig
-===================================================================
---- linux-stable.orig/drivers/leds/trigger/Kconfig
-+++ linux-stable/drivers/leds/trigger/Kconfig
-@@ -61,7 +61,7 @@ config LEDS_TRIGGER_BACKLIGHT
-
- config LEDS_TRIGGER_CPU
- bool "LED CPU Trigger"
-- depends on LEDS_TRIGGERS
-+ depends on LEDS_TRIGGERS && !PREEMPT_RT_BASE
- help
- This allows LEDs to be controlled by active CPUs. This shows
- the active CPUs across an array of LEDs so you can see which
-Index: linux-stable/drivers/i2c/busses/i2c-omap.c
-===================================================================
---- linux-stable.orig/drivers/i2c/busses/i2c-omap.c
-+++ linux-stable/drivers/i2c/busses/i2c-omap.c
-@@ -879,15 +879,12 @@ omap_i2c_isr(int irq, void *dev_id)
- u16 mask;
- u16 stat;
-
-- spin_lock(&dev->lock);
-- mask = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
- stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
-+ mask = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
-
- if (stat & mask)
- ret = IRQ_WAKE_THREAD;
-
-- spin_unlock(&dev->lock);
--
- return ret;
- }
-
-Index: linux-stable/drivers/mmc/host/mmci.c
-===================================================================
---- linux-stable.orig/drivers/mmc/host/mmci.c
-+++ linux-stable/drivers/mmc/host/mmci.c
-@@ -1044,15 +1044,12 @@ static irqreturn_t mmci_pio_irq(int irq,
- struct sg_mapping_iter *sg_miter = &host->sg_miter;
- struct variant_data *variant = host->variant;
- void __iomem *base = host->base;
-- unsigned long flags;
- u32 status;
-
- status = readl(base + MMCISTATUS);
-
- dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status);
-
-- local_irq_save(flags);
--
- do {
- unsigned int remain, len;
- char *buffer;
-@@ -1092,8 +1089,6 @@ static irqreturn_t mmci_pio_irq(int irq,
-
- sg_miter_stop(sg_miter);
-
-- local_irq_restore(flags);
--
- /*
- * If we have less than the fifo 'half-full' threshold to transfer,
- * trigger a PIO interrupt as soon as any data is available.
-Index: linux-stable/drivers/gpu/drm/i915/i915_gem.c
-===================================================================
---- linux-stable.orig/drivers/gpu/drm/i915/i915_gem.c
-+++ linux-stable/drivers/gpu/drm/i915/i915_gem.c
-@@ -4975,7 +4975,7 @@ static bool mutex_is_locked_by(struct mu
- if (!mutex_is_locked(mutex))
- return false;
-
--#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_MUTEXES)
-+#if (defined(CONFIG_SMP) || defined(CONFIG_DEBUG_MUTEXES)) && !defined(CONFIG_PREEMPT_RT_BASE)
- return mutex->owner == task;
- #else
- /* Since UP may be pre-empted, we cannot assume that we own the lock */
-Index: linux-stable/drivers/gpu/drm/i915/i915_gem_execbuffer.c
-===================================================================
---- linux-stable.orig/drivers/gpu/drm/i915/i915_gem_execbuffer.c
-+++ linux-stable/drivers/gpu/drm/i915/i915_gem_execbuffer.c
-@@ -1243,7 +1243,9 @@ i915_gem_do_execbuffer(struct drm_device
- goto err;
- }
-
-+#ifndef CONFIG_PREEMPT_RT_BASE
- trace_i915_gem_ring_dispatch(ring, intel_ring_get_seqno(ring), flags);
-+#endif
-
- i915_gem_execbuffer_move_to_active(&eb->vmas, ring);
- i915_gem_execbuffer_retire_commands(dev, file, ring, batch_obj);
-Index: linux-stable/include/linux/wait.h
-===================================================================
---- linux-stable.orig/include/linux/wait.h
-+++ linux-stable/include/linux/wait.h
-@@ -8,6 +8,7 @@
- #include <linux/spinlock.h>
- #include <asm/current.h>
- #include <uapi/linux/wait.h>
-+#include <linux/atomic.h>
-
- typedef struct __wait_queue wait_queue_t;
- typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int flags, void *key);
-Index: linux-stable/include/linux/wait-simple.h
-===================================================================
---- /dev/null
-+++ linux-stable/include/linux/wait-simple.h
-@@ -0,0 +1,207 @@
-+#ifndef _LINUX_WAIT_SIMPLE_H
-+#define _LINUX_WAIT_SIMPLE_H
-+
-+#include <linux/spinlock.h>
-+#include <linux/list.h>
-+
-+#include <asm/current.h>
-+
-+struct swaiter {
-+ struct task_struct *task;
-+ struct list_head node;
-+};
-+
-+#define DEFINE_SWAITER(name) \
-+ struct swaiter name = { \
-+ .task = current, \
-+ .node = LIST_HEAD_INIT((name).node), \
-+ }
-+
-+struct swait_head {
-+ raw_spinlock_t lock;
-+ struct list_head list;
-+};
-+
-+#define SWAIT_HEAD_INITIALIZER(name) { \
-+ .lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \
-+ .list = LIST_HEAD_INIT((name).list), \
-+ }
-+
-+#define DEFINE_SWAIT_HEAD(name) \
-+ struct swait_head name = SWAIT_HEAD_INITIALIZER(name)
-+
-+extern void __init_swait_head(struct swait_head *h, struct lock_class_key *key);
-+
-+#define init_swait_head(swh) \
-+ do { \
-+ static struct lock_class_key __key; \
-+ \
-+ __init_swait_head((swh), &__key); \
-+ } while (0)
-+
-+/*
-+ * Waiter functions
-+ */
-+extern void swait_prepare_locked(struct swait_head *head, struct swaiter *w);
-+extern void swait_prepare(struct swait_head *head, struct swaiter *w, int state);
-+extern void swait_finish_locked(struct swait_head *head, struct swaiter *w);
-+extern void swait_finish(struct swait_head *head, struct swaiter *w);
-+
-+/* Check whether a head has waiters enqueued */
-+static inline bool swaitqueue_active(struct swait_head *h)
-+{
-+ /* Make sure the condition is visible before checking list_empty() */
-+ smp_mb();
-+ return !list_empty(&h->list);
-+}
-+
-+/*
-+ * Wakeup functions
-+ */
-+extern unsigned int __swait_wake(struct swait_head *head, unsigned int state, unsigned int num);
-+extern unsigned int __swait_wake_locked(struct swait_head *head, unsigned int state, unsigned int num);
-+
-+#define swait_wake(head) __swait_wake(head, TASK_NORMAL, 1)
-+#define swait_wake_interruptible(head) __swait_wake(head, TASK_INTERRUPTIBLE, 1)
-+#define swait_wake_all(head) __swait_wake(head, TASK_NORMAL, 0)
-+#define swait_wake_all_interruptible(head) __swait_wake(head, TASK_INTERRUPTIBLE, 0)
-+
-+/*
-+ * Event API
-+ */
-+#define __swait_event(wq, condition) \
-+do { \
-+ DEFINE_SWAITER(__wait); \
-+ \
-+ for (;;) { \
-+ swait_prepare(&wq, &__wait, TASK_UNINTERRUPTIBLE); \
-+ if (condition) \
-+ break; \
-+ schedule(); \
-+ } \
-+ swait_finish(&wq, &__wait); \
-+} while (0)
-+
-+/**
-+ * swait_event - sleep until a condition gets true
-+ * @wq: the waitqueue to wait on
-+ * @condition: a C expression for the event to wait for
-+ *
-+ * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
-+ * @condition evaluates to true. The @condition is checked each time
-+ * the waitqueue @wq is woken up.
-+ *
-+ * wake_up() has to be called after changing any variable that could
-+ * change the result of the wait condition.
-+ */
-+#define swait_event(wq, condition) \
-+do { \
-+ if (condition) \
-+ break; \
-+ __swait_event(wq, condition); \
-+} while (0)
-+
-+#define __swait_event_interruptible(wq, condition, ret) \
-+do { \
-+ DEFINE_SWAITER(__wait); \
-+ \
-+ for (;;) { \
-+ swait_prepare(&wq, &__wait, TASK_INTERRUPTIBLE); \
-+ if (condition) \
-+ break; \
-+ if (signal_pending(current)) { \
-+ ret = -ERESTARTSYS; \
-+ break; \
-+ } \
-+ schedule(); \
-+ } \
-+ swait_finish(&wq, &__wait); \
-+} while (0)
-+
-+#define __swait_event_interruptible_timeout(wq, condition, ret) \
-+do { \
-+ DEFINE_SWAITER(__wait); \
-+ \
-+ for (;;) { \
-+ swait_prepare(&wq, &__wait, TASK_INTERRUPTIBLE); \
-+ if (condition) \
-+ break; \
-+ if (signal_pending(current)) { \
-+ ret = -ERESTARTSYS; \
-+ break; \
-+ } \
-+ ret = schedule_timeout(ret); \
-+ if (!ret) \
-+ break; \
-+ } \
-+ swait_finish(&wq, &__wait); \
-+} while (0)
-+
-+/**
-+ * swait_event_interruptible - sleep until a condition gets true
-+ * @wq: the waitqueue to wait on
-+ * @condition: a C expression for the event to wait for
-+ *
-+ * The process is put to sleep (TASK_INTERRUPTIBLE) until the
-+ * @condition evaluates to true. The @condition is checked each time
-+ * the waitqueue @wq is woken up.
-+ *
-+ * wake_up() has to be called after changing any variable that could
-+ * change the result of the wait condition.
-+ */
-+#define swait_event_interruptible(wq, condition) \
-+({ \
-+ int __ret = 0; \
-+ if (!(condition)) \
-+ __swait_event_interruptible(wq, condition, __ret); \
-+ __ret; \
-+})
-+
-+#define swait_event_interruptible_timeout(wq, condition, timeout) \
-+({ \
-+ int __ret = timeout; \
-+ if (!(condition)) \
-+ __swait_event_interruptible_timeout(wq, condition, __ret); \
-+ __ret; \
-+})
-+
-+#define __swait_event_timeout(wq, condition, ret) \
-+do { \
-+ DEFINE_SWAITER(__wait); \
-+ \
-+ for (;;) { \
-+ swait_prepare(&wq, &__wait, TASK_UNINTERRUPTIBLE); \
-+ if (condition) \
-+ break; \
-+ ret = schedule_timeout(ret); \
-+ if (!ret) \
-+ break; \
-+ } \
-+ swait_finish(&wq, &__wait); \
-+} while (0)
-+
-+/**
-+ * swait_event_timeout - sleep until a condition gets true or a timeout elapses
-+ * @wq: the waitqueue to wait on
-+ * @condition: a C expression for the event to wait for
-+ * @timeout: timeout, in jiffies
-+ *
-+ * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
-+ * @condition evaluates to true. The @condition is checked each time
-+ * the waitqueue @wq is woken up.
-+ *
-+ * wake_up() has to be called after changing any variable that could
-+ * change the result of the wait condition.
-+ *
-+ * The function returns 0 if the @timeout elapsed, and the remaining
-+ * jiffies if the condition evaluated to true before the timeout elapsed.
-+ */
-+#define swait_event_timeout(wq, condition, timeout) \
-+({ \
-+ long __ret = timeout; \
-+ if (!(condition)) \
-+ __swait_event_timeout(wq, condition, __ret); \
-+ __ret; \
-+})
-+
-+#endif
-Index: linux-stable/kernel/sched/Makefile
-===================================================================
---- linux-stable.orig/kernel/sched/Makefile
-+++ linux-stable/kernel/sched/Makefile
-@@ -13,7 +13,7 @@ endif
-
- obj-y += core.o proc.o clock.o cputime.o
- obj-y += idle_task.o fair.o rt.o deadline.o stop_task.o
--obj-y += wait.o completion.o
-+obj-y += wait.o wait-simple.o completion.o
- obj-$(CONFIG_SMP) += cpupri.o cpudeadline.o
- obj-$(CONFIG_SCHED_AUTOGROUP) += auto_group.o
- obj-$(CONFIG_SCHEDSTATS) += stats.o
-Index: linux-stable/kernel/sched/wait-simple.c
-===================================================================
---- /dev/null
-+++ linux-stable/kernel/sched/wait-simple.c
-@@ -0,0 +1,115 @@
-+/*
-+ * Simple waitqueues without fancy flags and callbacks
-+ *
-+ * (C) 2011 Thomas Gleixner <tglx@linutronix.de>
-+ *
-+ * Based on kernel/wait.c
-+ *
-+ * For licencing details see kernel-base/COPYING
-+ */
-+#include <linux/init.h>
-+#include <linux/export.h>
-+#include <linux/sched.h>
-+#include <linux/wait-simple.h>
-+
-+/* Adds w to head->list. Must be called with head->lock locked. */
-+static inline void __swait_enqueue(struct swait_head *head, struct swaiter *w)
-+{
-+ list_add(&w->node, &head->list);
-+ /* We can't let the condition leak before the setting of head */
-+ smp_mb();
-+}
-+
-+/* Removes w from head->list. Must be called with head->lock locked. */
-+static inline void __swait_dequeue(struct swaiter *w)
-+{
-+ list_del_init(&w->node);
-+}
-+
-+void __init_swait_head(struct swait_head *head, struct lock_class_key *key)
-+{
-+ raw_spin_lock_init(&head->lock);
-+ lockdep_set_class(&head->lock, key);
-+ INIT_LIST_HEAD(&head->list);
-+}
-+EXPORT_SYMBOL(__init_swait_head);
-+
-+void swait_prepare_locked(struct swait_head *head, struct swaiter *w)
-+{
-+ w->task = current;
-+ if (list_empty(&w->node))
-+ __swait_enqueue(head, w);
-+}
-+
-+void swait_prepare(struct swait_head *head, struct swaiter *w, int state)
-+{
-+ unsigned long flags;
-+
-+ raw_spin_lock_irqsave(&head->lock, flags);
-+ swait_prepare_locked(head, w);
-+ __set_current_state(state);
-+ raw_spin_unlock_irqrestore(&head->lock, flags);
-+}
-+EXPORT_SYMBOL(swait_prepare);
-+
-+void swait_finish_locked(struct swait_head *head, struct swaiter *w)
-+{
-+ __set_current_state(TASK_RUNNING);
-+ if (w->task)
-+ __swait_dequeue(w);
-+}
-+
-+void swait_finish(struct swait_head *head, struct swaiter *w)
-+{
-+ unsigned long flags;
-+
-+ __set_current_state(TASK_RUNNING);
-+ if (w->task) {
-+ raw_spin_lock_irqsave(&head->lock, flags);
-+ __swait_dequeue(w);
-+ raw_spin_unlock_irqrestore(&head->lock, flags);
-+ }
-+}
-+EXPORT_SYMBOL(swait_finish);
-+
-+unsigned int
-+__swait_wake_locked(struct swait_head *head, unsigned int state, unsigned int num)
-+{
-+ struct swaiter *curr, *next;
-+ int woken = 0;
-+
-+ list_for_each_entry_safe(curr, next, &head->list, node) {
-+ if (wake_up_state(curr->task, state)) {
-+ __swait_dequeue(curr);
-+ /*
-+ * The waiting task can free the waiter as
-+ * soon as curr->task = NULL is written,
-+ * without taking any locks. A memory barrier
-+ * is required here to prevent the following
-+ * store to curr->task from getting ahead of
-+ * the dequeue operation.
-+ */
-+ smp_wmb();
-+ curr->task = NULL;
-+ if (++woken == num)
-+ break;
-+ }
-+ }
-+ return woken;
-+}
-+
-+unsigned int
-+__swait_wake(struct swait_head *head, unsigned int state, unsigned int num)
-+{
-+ unsigned long flags;
-+ int woken;
-+
-+ if (!swaitqueue_active(head))
-+ return 0;
-+
-+ raw_spin_lock_irqsave(&head->lock, flags);
-+ woken = __swait_wake_locked(head, state, num);
-+ raw_spin_unlock_irqrestore(&head->lock, flags);
-+ return woken;
-+}
-+EXPORT_SYMBOL(__swait_wake);
-Index: linux-stable/include/linux/completion.h
-===================================================================
---- linux-stable.orig/include/linux/completion.h
-+++ linux-stable/include/linux/completion.h
-@@ -7,8 +7,7 @@
- * Atomic wait-for-completion handler data structures.
- * See kernel/sched/completion.c for details.
- */
--
--#include <linux/wait.h>
-+#include <linux/wait-simple.h>
-
- /*
- * struct completion - structure used to maintain state for a "completion"
-@@ -24,11 +23,11 @@
- */
- struct completion {
- unsigned int done;
-- wait_queue_head_t wait;
-+ struct swait_head wait;
- };
-
- #define COMPLETION_INITIALIZER(work) \
-- { 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait) }
-+ { 0, SWAIT_HEAD_INITIALIZER((work).wait) }
-
- #define COMPLETION_INITIALIZER_ONSTACK(work) \
- ({ init_completion(&work); work; })
-@@ -73,7 +72,7 @@ struct completion {
- static inline void init_completion(struct completion *x)
- {
- x->done = 0;
-- init_waitqueue_head(&x->wait);
-+ init_swait_head(&x->wait);
- }
-
- /**
-Index: linux-stable/include/linux/uprobes.h
-===================================================================
---- linux-stable.orig/include/linux/uprobes.h
-+++ linux-stable/include/linux/uprobes.h
-@@ -27,6 +27,7 @@
- #include <linux/errno.h>
- #include <linux/rbtree.h>
- #include <linux/types.h>
-+#include <linux/wait.h>
-
- struct vm_area_struct;
- struct mm_struct;
-Index: linux-stable/kernel/sched/completion.c
-===================================================================
---- linux-stable.orig/kernel/sched/completion.c
-+++ linux-stable/kernel/sched/completion.c
-@@ -30,10 +30,10 @@ void complete(struct completion *x)
- {
- unsigned long flags;
-
-- spin_lock_irqsave(&x->wait.lock, flags);
-+ raw_spin_lock_irqsave(&x->wait.lock, flags);
- x->done++;
-- __wake_up_locked(&x->wait, TASK_NORMAL, 1);
-- spin_unlock_irqrestore(&x->wait.lock, flags);
-+ __swait_wake_locked(&x->wait, TASK_NORMAL, 1);
-+ raw_spin_unlock_irqrestore(&x->wait.lock, flags);
- }
- EXPORT_SYMBOL(complete);
-
-@@ -50,10 +50,10 @@ void complete_all(struct completion *x)
- {
- unsigned long flags;
-
-- spin_lock_irqsave(&x->wait.lock, flags);
-+ raw_spin_lock_irqsave(&x->wait.lock, flags);
- x->done += UINT_MAX/2;
-- __wake_up_locked(&x->wait, TASK_NORMAL, 0);
-- spin_unlock_irqrestore(&x->wait.lock, flags);
-+ __swait_wake_locked(&x->wait, TASK_NORMAL, 0);
-+ raw_spin_unlock_irqrestore(&x->wait.lock, flags);
- }
- EXPORT_SYMBOL(complete_all);
-
-@@ -62,20 +62,20 @@ do_wait_for_common(struct completion *x,
- long (*action)(long), long timeout, int state)
- {
- if (!x->done) {
-- DECLARE_WAITQUEUE(wait, current);
-+ DEFINE_SWAITER(wait);
-
-- __add_wait_queue_tail_exclusive(&x->wait, &wait);
-+ swait_prepare_locked(&x->wait, &wait);
- do {
- if (signal_pending_state(state, current)) {
- timeout = -ERESTARTSYS;
- break;
- }
- __set_current_state(state);
-- spin_unlock_irq(&x->wait.lock);
-+ raw_spin_unlock_irq(&x->wait.lock);
- timeout = action(timeout);
-- spin_lock_irq(&x->wait.lock);
-+ raw_spin_lock_irq(&x->wait.lock);
- } while (!x->done && timeout);
-- __remove_wait_queue(&x->wait, &wait);
-+ swait_finish_locked(&x->wait, &wait);
- if (!x->done)
- return timeout;
- }
-@@ -89,9 +89,9 @@ __wait_for_common(struct completion *x,
- {
- might_sleep();
-
-- spin_lock_irq(&x->wait.lock);
-+ raw_spin_lock_irq(&x->wait.lock);
- timeout = do_wait_for_common(x, action, timeout, state);
-- spin_unlock_irq(&x->wait.lock);
-+ raw_spin_unlock_irq(&x->wait.lock);
- return timeout;
- }
-
-@@ -267,12 +267,12 @@ bool try_wait_for_completion(struct comp
- unsigned long flags;
- int ret = 1;
-
-- spin_lock_irqsave(&x->wait.lock, flags);
-+ raw_spin_lock_irqsave(&x->wait.lock, flags);
- if (!x->done)
- ret = 0;
- else
- x->done--;
-- spin_unlock_irqrestore(&x->wait.lock, flags);
-+ raw_spin_unlock_irqrestore(&x->wait.lock, flags);
- return ret;
- }
- EXPORT_SYMBOL(try_wait_for_completion);
-@@ -290,10 +290,10 @@ bool completion_done(struct completion *
- unsigned long flags;
- int ret = 1;
-
-- spin_lock_irqsave(&x->wait.lock, flags);
-+ raw_spin_lock_irqsave(&x->wait.lock, flags);
- if (!x->done)
- ret = 0;
-- spin_unlock_irqrestore(&x->wait.lock, flags);
-+ raw_spin_unlock_irqrestore(&x->wait.lock, flags);
- return ret;
- }
- EXPORT_SYMBOL(completion_done);
-Index: linux-stable/drivers/net/wireless/orinoco/orinoco_usb.c
-===================================================================
---- linux-stable.orig/drivers/net/wireless/orinoco/orinoco_usb.c
-+++ linux-stable/drivers/net/wireless/orinoco/orinoco_usb.c
-@@ -713,7 +713,7 @@ static void ezusb_req_ctx_wait(struct ez
- while (!ctx->done.done && msecs--)
- udelay(1000);
- } else {
-- wait_event_interruptible(ctx->done.wait,
-+ swait_event_interruptible(ctx->done.wait,
- ctx->done.done);
- }
- break;
-Index: linux-stable/drivers/usb/gadget/f_fs.c
-===================================================================
---- linux-stable.orig/drivers/usb/gadget/f_fs.c
-+++ linux-stable/drivers/usb/gadget/f_fs.c
-@@ -1120,7 +1120,7 @@ static void ffs_data_put(struct ffs_data
- pr_info("%s(): freeing\n", __func__);
- ffs_data_clear(ffs);
- BUG_ON(waitqueue_active(&ffs->ev.waitq) ||
-- waitqueue_active(&ffs->ep0req_completion.wait));
-+ swaitqueue_active(&ffs->ep0req_completion.wait));
- kfree(ffs->dev_name);
- kfree(ffs);
- }
-Index: linux-stable/drivers/usb/gadget/inode.c
-===================================================================
---- linux-stable.orig/drivers/usb/gadget/inode.c
-+++ linux-stable/drivers/usb/gadget/inode.c
-@@ -340,7 +340,7 @@ ep_io (struct ep_data *epdata, void *buf
- spin_unlock_irq (&epdata->dev->lock);
-
- if (likely (value == 0)) {
-- value = wait_event_interruptible (done.wait, done.done);
-+ value = swait_event_interruptible (done.wait, done.done);
- if (value != 0) {
- spin_lock_irq (&epdata->dev->lock);
- if (likely (epdata->ep != NULL)) {
-@@ -349,7 +349,7 @@ ep_io (struct ep_data *epdata, void *buf
- usb_ep_dequeue (epdata->ep, epdata->req);
- spin_unlock_irq (&epdata->dev->lock);
-
-- wait_event (done.wait, done.done);
-+ swait_event (done.wait, done.done);
- if (epdata->status == -ECONNRESET)
- epdata->status = -EINTR;
- } else {
-Index: linux-stable/kernel/time/ntp.c
-===================================================================
---- linux-stable.orig/kernel/time/ntp.c
-+++ linux-stable/kernel/time/ntp.c
-@@ -10,6 +10,7 @@
- #include <linux/workqueue.h>
- #include <linux/hrtimer.h>
- #include <linux/jiffies.h>
-+#include <linux/kthread.h>
- #include <linux/math64.h>
- #include <linux/timex.h>
- #include <linux/time.h>
-@@ -517,10 +518,49 @@ static void sync_cmos_clock(struct work_
- schedule_delayed_work(&sync_cmos_work, timespec_to_jiffies(&next));
- }
-
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+/*
-+ * RT can not call schedule_delayed_work from real interrupt context.
-+ * Need to make a thread to do the real work.
-+ */
-+static struct task_struct *cmos_delay_thread;
-+static bool do_cmos_delay;
-+
-+static int run_cmos_delay(void *ignore)
-+{
-+ while (!kthread_should_stop()) {
-+ set_current_state(TASK_INTERRUPTIBLE);
-+ if (do_cmos_delay) {
-+ do_cmos_delay = false;
-+ schedule_delayed_work(&sync_cmos_work, 0);
-+ }
-+ schedule();
-+ }
-+ __set_current_state(TASK_RUNNING);
-+ return 0;
-+}
-+
-+void ntp_notify_cmos_timer(void)
-+{
-+ do_cmos_delay = true;
-+ /* Make visible before waking up process */
-+ smp_wmb();
-+ wake_up_process(cmos_delay_thread);
-+}
-+
-+static __init int create_cmos_delay_thread(void)
-+{
-+ cmos_delay_thread = kthread_run(run_cmos_delay, NULL, "kcmosdelayd");
-+ BUG_ON(!cmos_delay_thread);
-+ return 0;
-+}
-+early_initcall(create_cmos_delay_thread);
-+#else
- void ntp_notify_cmos_timer(void)
- {
- schedule_delayed_work(&sync_cmos_work, 0);
- }
-+#endif /* CONFIG_PREEMPT_RT_FULL */
-
- #else
- void ntp_notify_cmos_timer(void) { }
-Index: linux-stable/drivers/md/bcache/Kconfig
-===================================================================
---- linux-stable.orig/drivers/md/bcache/Kconfig
-+++ linux-stable/drivers/md/bcache/Kconfig
-@@ -1,6 +1,7 @@
-
- config BCACHE
- tristate "Block device as cache"
-+ depends on !PREEMPT_RT_FULL
- ---help---
- Allows a block device to be used as cache for other devices; uses
- a btree for indexing and the layout is optimized for SSDs.
-Index: linux-stable/localversion-rt
-===================================================================
---- /dev/null
-+++ linux-stable/localversion-rt
-@@ -0,0 +1 @@
-+-rt9
diff --git a/kernels/linux-libre-rt/revert_timers-dont_raise_softirq_unconditionally_and_fixes.patch b/kernels/linux-libre-rt/revert_timers-dont_raise_softirq_unconditionally_and_fixes.patch
deleted file mode 100644
index ffd42376a..000000000
--- a/kernels/linux-libre-rt/revert_timers-dont_raise_softirq_unconditionally_and_fixes.patch
+++ /dev/null
@@ -1,130 +0,0 @@
-diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
-index bdbf77db..79a7a35 100644
---- a/include/linux/hrtimer.h
-+++ b/include/linux/hrtimer.h
-@@ -461,8 +461,9 @@ extern int schedule_hrtimeout_range_clock(ktime_t *expires,
- unsigned long delta, const enum hrtimer_mode mode, int clock);
- extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode);
-
--/* Called from the periodic timer tick */
-+/* Soft interrupt function to run the hrtimer queues: */
- extern void hrtimer_run_queues(void);
-+extern void hrtimer_run_pending(void);
-
- /* Bootup initialization: */
- extern void __init hrtimers_init(void);
-diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
-index c19183d..c6d8232 100644
---- a/kernel/hrtimer.c
-+++ b/kernel/hrtimer.c
-@@ -1694,6 +1694,30 @@ static void run_hrtimer_softirq(struct softirq_action *h)
- }
-
- /*
-+ * Called from timer softirq every jiffy, expire hrtimers:
-+ *
-+ * For HRT its the fall back code to run the softirq in the timer
-+ * softirq context in case the hrtimer initialization failed or has
-+ * not been done yet.
-+ */
-+void hrtimer_run_pending(void)
-+{
-+ if (hrtimer_hres_active())
-+ return;
-+
-+ /*
-+ * This _is_ ugly: We have to check in the softirq context,
-+ * whether we can switch to highres and / or nohz mode. The
-+ * clocksource switch happens in the timer interrupt with
-+ * xtime_lock held. Notification from there only sets the
-+ * check bit in the tick_oneshot code, otherwise we might
-+ * deadlock vs. xtime_lock.
-+ */
-+ if (tick_check_oneshot_change(!hrtimer_is_hres_enabled()))
-+ hrtimer_switch_to_hres();
-+}
-+
-+/*
- * Called from hardirq context every jiffy
- */
- void hrtimer_run_queues(void)
-@@ -1706,13 +1730,6 @@ void hrtimer_run_queues(void)
- if (hrtimer_hres_active())
- return;
-
-- /*
-- * Check whether we can switch to highres mode.
-- */
-- if (tick_check_oneshot_change(!hrtimer_is_hres_enabled())
-- && hrtimer_switch_to_hres())
-- return;
--
- for (index = 0; index < HRTIMER_MAX_CLOCK_BASES; index++) {
- base = &cpu_base->clock_base[index];
- if (!timerqueue_getnext(&base->active))
-diff --git a/kernel/timer.c b/kernel/timer.c
-index cc34e42..7c523a4 100644
---- a/kernel/timer.c
-+++ b/kernel/timer.c
-@@ -1443,6 +1443,8 @@
- irq_work_run();
- #endif
-
-+ hrtimer_run_pending();
-+
- if (time_after_eq(jiffies, base->timer_jiffies))
- __run_timers(base);
- }
-@@ -1452,52 +1454,8 @@
- */
- void run_local_timers(void)
- {
-- struct tvec_base *base = __this_cpu_read(tvec_bases);
--
- hrtimer_run_queues();
-- /*
-- * We can access this lockless as we are in the timer
-- * interrupt. If there are no timers queued, nothing to do in
-- * the timer softirq.
-- */
--#ifdef CONFIG_PREEMPT_RT_FULL
--
--#ifndef CONFIG_SMP
-- /*
-- * The spin_do_trylock() later may fail as the lock may be hold before
-- * the interrupt arrived. The spin-lock debugging code will raise a
-- * warning if the try_lock fails on UP. Since this is only an
-- * optimization for the FULL_NO_HZ case (not to run the timer softirq on
-- * an nohz_full CPU) we don't really care and shedule the softirq.
-- */
- raise_softirq(TIMER_SOFTIRQ);
-- return;
--#endif
--
-- /* On RT, irq work runs from softirq */
-- if (irq_work_needs_cpu()) {
-- raise_softirq(TIMER_SOFTIRQ);
-- return;
-- }
--
-- if (!spin_do_trylock(&base->lock)) {
-- raise_softirq(TIMER_SOFTIRQ);
-- return;
-- }
--#endif
--
-- if (!base->active_timers)
-- goto out;
--
-- /* Check whether the next pending timer has expired */
-- if (time_before_eq(base->next_timer, jiffies))
-- raise_softirq(TIMER_SOFTIRQ);
--out:
--#ifdef CONFIG_PREEMPT_RT_FULL
-- rt_spin_unlock_after_trylock_in_irq(&base->lock);
--#endif
-- /* The ; ensures that gcc won't complain in the !RT case */
-- ;
- }
-
- #ifdef __ARCH_WANT_SYS_ALARM