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Date: Mon, 7 Mar 2016 15:52:05 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>,
linux-rt-users <linux-rt-users@...r.kernel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Carsten Emde <C.Emde@...dl.org>,
John Kacur <jkacur@...hat.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [ANNOUNCE] 4.1.15-rt18
Dear RT Folks,
I'm pleased to announce the 4.1.15-rt18 stable release.
You can get this release via the git tree at:
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git
branch: v4.1-rt
Head SHA1: 609a831b25ff68704219f035ae514e2a57647d29
Or to build 4.1.15-rt18 directly, the following patches should be applied:
http://www.kernel.org/pub/linux/kernel/v3.x/linux-4.1.tar.xz
http://www.kernel.org/pub/linux/kernel/v3.x/patch-4.1.15.xz
http://www.kernel.org/pub/linux/kernel/projects/rt/4.1/patch-4.1.15-rt18.patch.xz
You can also build from 4.1.15-rt17 by applying the incremental patch:
http://www.kernel.org/pub/linux/kernel/projects/rt/4.1/incr/patch-4.1.15-rt17-rt18.patch.xz
Enjoy,
-- Steve
Changes from v4.1.15-rt17:
---
Clark Williams (1):
rcu/torture: Comment out rcu_bh ops on PREEMPT_RT_FULL
Mike Galbraith (3):
sched,rt: __always_inline preemptible_lazy()
drm,radeon,i915: Use preempt_disable/enable_rt() where recommended
drm,i915: Use local_lock/unlock_irq() in intel_pipe_update_start/end()
Sebastian Andrzej Siewior (13):
sched: reset task's lockless wake-queues on fork()
ptrace: don't open IRQs in ptrace_freeze_traced() too early
net: move xmit_recursion to per-task variable on -RT
kernel/softirq: use cond_resched_rcu_qs() on -RT as well (run_ksoftirqd())
net/core: protect users of napi_alloc_cache against reentrance
preempt-lazy: Add the lazy-preemption check to preempt_schedule()
softirq: split timer softirqs out of ksoftirqd
net: provide a way to delegate processing a softirq to ksoftirqd
latencyhist: disable jump-labels
kernel: migrate_disable() do fastpath in atomic & irqs-off
kernel: softirq: unlock with irqs on
kernel/stop_machine: partly revert "stop_machine: Use raw spinlocks"
kernel: sched: Fix preempt_disable_ip recodring for preempt_disable()
Steven Rostedt (Red Hat) (1):
Linux 4.1.15-rt18
Thomas Gleixner (1):
tick/broadcast: Make broadcast hrtimer irqsafe
Yang Shi (3):
arm64: replace read_lock to rcu lock in call_step_hook
trace: Use rcuidle version for preemptoff_hist trace point
f2fs: Mutex can't be used by down_write_nest_lock()
----
arch/Kconfig | 1 +
arch/arm64/kernel/debug-monitors.c | 21 +++---
drivers/gpu/drm/i915/i915_irq.c | 2 +
drivers/gpu/drm/i915/intel_sprite.c | 11 +--
drivers/gpu/drm/radeon/radeon_display.c | 2 +
fs/f2fs/f2fs.h | 4 +-
include/linux/ftrace.h | 12 ++++
include/linux/interrupt.h | 8 +++
include/linux/netdevice.h | 9 +++
include/linux/sched.h | 5 +-
kernel/fork.c | 1 +
kernel/ptrace.c | 6 +-
kernel/rcu/rcutorture.c | 7 ++
kernel/sched/core.c | 54 +++++++++------
kernel/softirq.c | 116 +++++++++++++++++++++++++++-----
kernel/stop_machine.c | 40 +++--------
kernel/time/tick-broadcast-hrtimer.c | 1 +
kernel/trace/trace_irqsoff.c | 8 +--
localversion-rt | 2 +-
net/core/dev.c | 43 ++++++++++--
net/core/skbuff.c | 8 ++-
21 files changed, 261 insertions(+), 100 deletions(-)
---------------------------
diff --git a/arch/Kconfig b/arch/Kconfig
index cb27d367b24a..78d3ed24484a 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -50,6 +50,7 @@ config KPROBES
config JUMP_LABEL
bool "Optimize very unlikely/likely branches"
depends on HAVE_ARCH_JUMP_LABEL
+ depends on (!INTERRUPT_OFF_HIST && !PREEMPT_OFF_HIST && !WAKEUP_LATENCY_HIST && !MISSED_TIMER_OFFSETS_HIST)
help
This option enables a transparent branch optimization that
makes certain almost-always-true or almost-always-false branch
diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c
index 70654d843d9b..0d1d675f2cce 100644
--- a/arch/arm64/kernel/debug-monitors.c
+++ b/arch/arm64/kernel/debug-monitors.c
@@ -184,20 +184,21 @@ static void clear_regs_spsr_ss(struct pt_regs *regs)
/* EL1 Single Step Handler hooks */
static LIST_HEAD(step_hook);
-static DEFINE_RWLOCK(step_hook_lock);
+static DEFINE_SPINLOCK(step_hook_lock);
void register_step_hook(struct step_hook *hook)
{
- write_lock(&step_hook_lock);
- list_add(&hook->node, &step_hook);
- write_unlock(&step_hook_lock);
+ spin_lock(&step_hook_lock);
+ list_add_rcu(&hook->node, &step_hook);
+ spin_unlock(&step_hook_lock);
}
void unregister_step_hook(struct step_hook *hook)
{
- write_lock(&step_hook_lock);
- list_del(&hook->node);
- write_unlock(&step_hook_lock);
+ spin_lock(&step_hook_lock);
+ list_del_rcu(&hook->node);
+ spin_unlock(&step_hook_lock);
+ synchronize_rcu();
}
/*
@@ -211,15 +212,15 @@ static int call_step_hook(struct pt_regs *regs, unsigned int esr)
struct step_hook *hook;
int retval = DBG_HOOK_ERROR;
- read_lock(&step_hook_lock);
+ rcu_read_lock();
- list_for_each_entry(hook, &step_hook, node) {
+ list_for_each_entry_rcu(hook, &step_hook, node) {
retval = hook->fn(regs, esr);
if (retval == DBG_HOOK_HANDLED)
break;
}
- read_unlock(&step_hook_lock);
+ rcu_read_unlock();
return retval;
}
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index b0df8d10482a..8d34df020842 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -676,6 +676,7 @@ static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
/* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
+ preempt_disable_rt();
/* Get optional system timestamp before query. */
if (stime)
@@ -727,6 +728,7 @@ static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
*etime = ktime_get();
/* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */
+ preempt_enable_rt();
spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index a4c0a04b5044..6da459fe20b2 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -37,6 +37,7 @@
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"
+#include <linux/locallock.h>
static bool
format_is_yuv(uint32_t format)
@@ -61,6 +62,8 @@ static int usecs_to_scanlines(const struct drm_display_mode *mode, int usecs)
return DIV_ROUND_UP(usecs * mode->crtc_clock, 1000 * mode->crtc_htotal);
}
+static DEFINE_LOCAL_IRQ_LOCK(pipe_update_lock);
+
/**
* intel_pipe_update_start() - start update of a set of display registers
* @crtc: the crtc of which the registers are going to be updated
@@ -101,7 +104,7 @@ bool intel_pipe_update_start(struct intel_crtc *crtc, uint32_t *start_vbl_count)
if (WARN_ON(drm_crtc_vblank_get(&crtc->base)))
return false;
- local_irq_disable();
+ local_lock_irq(pipe_update_lock);
trace_i915_pipe_update_start(crtc, min, max);
@@ -123,11 +126,11 @@ bool intel_pipe_update_start(struct intel_crtc *crtc, uint32_t *start_vbl_count)
break;
}
- local_irq_enable();
+ local_unlock_irq(pipe_update_lock);
timeout = schedule_timeout(timeout);
- local_irq_disable();
+ local_lock_irq(pipe_update_lock);
}
finish_wait(wq, &wait);
@@ -158,7 +161,7 @@ void intel_pipe_update_end(struct intel_crtc *crtc, u32 start_vbl_count)
trace_i915_pipe_update_end(crtc, end_vbl_count);
- local_irq_enable();
+ local_unlock_irq(pipe_update_lock);
if (start_vbl_count != end_vbl_count)
DRM_ERROR("Atomic update failure on pipe %c (start=%u end=%u)\n",
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 6743174acdbc..8ad198bbc24d 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -1798,6 +1798,7 @@ int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc, unsigned int fl
struct radeon_device *rdev = dev->dev_private;
/* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
+ preempt_disable_rt();
/* Get optional system timestamp before query. */
if (stime)
@@ -1890,6 +1891,7 @@ int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc, unsigned int fl
*etime = ktime_get();
/* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */
+ preempt_enable_rt();
/* Decode into vertical and horizontal scanout position. */
*vpos = position & 0x1fff;
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 8de34ab6d5b1..4e80270703a4 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -22,7 +22,6 @@
#ifdef CONFIG_F2FS_CHECK_FS
#define f2fs_bug_on(sbi, condition) BUG_ON(condition)
-#define f2fs_down_write(x, y) down_write_nest_lock(x, y)
#else
#define f2fs_bug_on(sbi, condition) \
do { \
@@ -31,7 +30,6 @@
set_sbi_flag(sbi, SBI_NEED_FSCK); \
} \
} while (0)
-#define f2fs_down_write(x, y) down_write(x)
#endif
/*
@@ -838,7 +836,7 @@ static inline void f2fs_unlock_op(struct f2fs_sb_info *sbi)
static inline void f2fs_lock_all(struct f2fs_sb_info *sbi)
{
- f2fs_down_write(&sbi->cp_rwsem, &sbi->cp_mutex);
+ down_write(&sbi->cp_rwsem);
}
static inline void f2fs_unlock_all(struct f2fs_sb_info *sbi)
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 6cd8c0ee4b6f..1ec37fef6355 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -682,6 +682,18 @@ static inline void __ftrace_enabled_restore(int enabled)
#define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5))
#define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6))
+static inline unsigned long get_lock_parent_ip(void)
+{
+ unsigned long addr = CALLER_ADDR0;
+
+ if (!in_lock_functions(addr))
+ return addr;
+ addr = CALLER_ADDR1;
+ if (!in_lock_functions(addr))
+ return addr;
+ return CALLER_ADDR2;
+}
+
#ifdef CONFIG_IRQSOFF_TRACER
extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index fe254555cf95..d11fd0a440ff 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -463,6 +463,14 @@ extern void thread_do_softirq(void);
extern void open_softirq(int nr, void (*action)(struct softirq_action *));
extern void softirq_init(void);
extern void __raise_softirq_irqoff(unsigned int nr);
+#ifdef CONFIG_PREEMPT_RT_FULL
+extern void __raise_softirq_irqoff_ksoft(unsigned int nr);
+#else
+static inline void __raise_softirq_irqoff_ksoft(unsigned int nr)
+{
+ __raise_softirq_irqoff(nr);
+}
+#endif
extern void raise_softirq_irqoff(unsigned int nr);
extern void raise_softirq(unsigned int nr);
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7a289e802a23..d24fe5d9980d 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2192,11 +2192,20 @@ void netdev_freemem(struct net_device *dev);
void synchronize_net(void);
int init_dummy_netdev(struct net_device *dev);
+#ifdef CONFIG_PREEMPT_RT_FULL
+static inline int dev_recursion_level(void)
+{
+ return current->xmit_recursion;
+}
+
+#else
+
DECLARE_PER_CPU(int, xmit_recursion);
static inline int dev_recursion_level(void)
{
return this_cpu_read(xmit_recursion);
}
+#endif
struct net_device *dev_get_by_index(struct net *net, int ifindex);
struct net_device *__dev_get_by_index(struct net *net, int ifindex);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 1a56c0512491..0f4a133f0abd 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -176,8 +176,6 @@ extern void get_iowait_load(unsigned long *nr_waiters, unsigned long *load);
extern void calc_global_load(unsigned long ticks);
extern void update_cpu_load_nohz(void);
-extern unsigned long get_parent_ip(unsigned long addr);
-
extern void dump_cpu_task(int cpu);
struct seq_file;
@@ -1806,6 +1804,9 @@ struct task_struct {
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
unsigned long task_state_change;
#endif
+#ifdef CONFIG_PREEMPT_RT_FULL
+ int xmit_recursion;
+#endif
int pagefault_disabled;
};
diff --git a/kernel/fork.c b/kernel/fork.c
index 1b0e656f60e8..8f8a0a13d212 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -387,6 +387,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
#endif
tsk->splice_pipe = NULL;
tsk->task_frag.page = NULL;
+ tsk->wake_q.next = NULL;
account_kernel_stack(ti, 1);
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index b8d001b89047..b90be3ae3a10 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -129,12 +129,14 @@ static bool ptrace_freeze_traced(struct task_struct *task)
spin_lock_irq(&task->sighand->siglock);
if (task_is_traced(task) && !__fatal_signal_pending(task)) {
- raw_spin_lock_irq(&task->pi_lock);
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&task->pi_lock, flags);
if (task->state & __TASK_TRACED)
task->state = __TASK_TRACED;
else
task->saved_state = __TASK_TRACED;
- raw_spin_unlock_irq(&task->pi_lock);
+ raw_spin_unlock_irqrestore(&task->pi_lock, flags);
ret = true;
}
spin_unlock_irq(&task->sighand->siglock);
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 8dbe27611ec3..7b6170a46409 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -389,6 +389,7 @@ static struct rcu_torture_ops rcu_ops = {
.name = "rcu"
};
+#ifndef CONFIG_PREEMPT_RT_FULL
/*
* Definitions for rcu_bh torture testing.
*/
@@ -428,6 +429,12 @@ static struct rcu_torture_ops rcu_bh_ops = {
.name = "rcu_bh"
};
+#else
+static struct rcu_torture_ops rcu_bh_ops = {
+ .ttype = INVALID_RCU_FLAVOR,
+};
+#endif
+
/*
* Don't even think about trying any of these in real life!!!
* The names includes "busted", and they really means it!
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index d21091f2fd1f..3b5d43a884e8 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2643,16 +2643,6 @@ u64 scheduler_tick_max_deferment(void)
}
#endif
-notrace unsigned long get_parent_ip(unsigned long addr)
-{
- if (in_lock_functions(addr)) {
- addr = CALLER_ADDR2;
- if (in_lock_functions(addr))
- addr = CALLER_ADDR3;
- }
- return addr;
-}
-
#if defined(CONFIG_PREEMPT) && (defined(CONFIG_DEBUG_PREEMPT) || \
defined(CONFIG_PREEMPT_TRACER))
@@ -2674,7 +2664,7 @@ void preempt_count_add(int val)
PREEMPT_MASK - 10);
#endif
if (preempt_count() == val) {
- unsigned long ip = get_parent_ip(CALLER_ADDR1);
+ unsigned long ip = get_lock_parent_ip();
#ifdef CONFIG_DEBUG_PREEMPT
current->preempt_disable_ip = ip;
#endif
@@ -2701,7 +2691,7 @@ void preempt_count_sub(int val)
#endif
if (preempt_count() == val)
- trace_preempt_on(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
+ trace_preempt_on(CALLER_ADDR0, get_lock_parent_ip());
__preempt_count_sub(val);
}
EXPORT_SYMBOL(preempt_count_sub);
@@ -2798,7 +2788,7 @@ void migrate_disable(void)
{
struct task_struct *p = current;
- if (in_atomic()) {
+ if (in_atomic() || irqs_disabled()) {
#ifdef CONFIG_SCHED_DEBUG
p->migrate_disable_atomic++;
#endif
@@ -2832,7 +2822,7 @@ void migrate_enable(void)
unsigned long flags;
struct rq *rq;
- if (in_atomic()) {
+ if (in_atomic() || irqs_disabled()) {
#ifdef CONFIG_SCHED_DEBUG
p->migrate_disable_atomic--;
#endif
@@ -3116,6 +3106,30 @@ static void __sched notrace preempt_schedule_common(void)
} while (need_resched());
}
+#ifdef CONFIG_PREEMPT_LAZY
+/*
+ * If TIF_NEED_RESCHED is then we allow to be scheduled away since this is
+ * set by a RT task. Oterwise we try to avoid beeing scheduled out as long as
+ * preempt_lazy_count counter >0.
+ */
+static __always_inline int preemptible_lazy(void)
+{
+ if (test_thread_flag(TIF_NEED_RESCHED))
+ return 1;
+ if (current_thread_info()->preempt_lazy_count)
+ return 0;
+ return 1;
+}
+
+#else
+
+static int preemptible_lazy(void)
+{
+ return 1;
+}
+
+#endif
+
#ifdef CONFIG_PREEMPT
/*
* this is the entry point to schedule() from in-kernel preemption
@@ -3130,6 +3144,8 @@ asmlinkage __visible void __sched notrace preempt_schedule(void)
*/
if (likely(!preemptible()))
return;
+ if (!preemptible_lazy())
+ return;
preempt_schedule_common();
}
@@ -3157,15 +3173,9 @@ asmlinkage __visible void __sched notrace preempt_schedule_context(void)
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))
+ if (!preemptible_lazy())
return;
-#endif
+
do {
__preempt_count_add(PREEMPT_ACTIVE);
/*
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 0fd93311536f..cb9c1d5dee10 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -58,6 +58,10 @@ EXPORT_SYMBOL(irq_stat);
static struct softirq_action softirq_vec[NR_SOFTIRQS] __cacheline_aligned_in_smp;
DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
+#ifdef CONFIG_PREEMPT_RT_FULL
+#define TIMER_SOFTIRQS ((1 << TIMER_SOFTIRQ) | (1 << HRTIMER_SOFTIRQ))
+DEFINE_PER_CPU(struct task_struct *, ktimer_softirqd);
+#endif
const char * const softirq_to_name[NR_SOFTIRQS] = {
"HI", "TIMER", "NET_TX", "NET_RX", "BLOCK", "BLOCK_IOPOLL",
@@ -171,6 +175,17 @@ static void wakeup_softirqd(void)
wake_up_process(tsk);
}
+#ifdef CONFIG_PREEMPT_RT_FULL
+static void wakeup_timer_softirqd(void)
+{
+ /* Interrupts are disabled: no need to stop preemption */
+ struct task_struct *tsk = __this_cpu_read(ktimer_softirqd);
+
+ if (tsk && tsk->state != TASK_RUNNING)
+ wake_up_process(tsk);
+}
+#endif
+
static void handle_softirq(unsigned int vec_nr)
{
struct softirq_action *h = softirq_vec + vec_nr;
@@ -272,9 +287,9 @@ void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
if (preempt_count() == cnt) {
#ifdef CONFIG_DEBUG_PREEMPT
- current->preempt_disable_ip = get_parent_ip(CALLER_ADDR1);
+ current->preempt_disable_ip = get_lock_parent_ip();
#endif
- trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
+ trace_preempt_off(CALLER_ADDR0, get_lock_parent_ip());
}
}
EXPORT_SYMBOL(__local_bh_disable_ip);
@@ -473,7 +488,6 @@ void __raise_softirq_irqoff(unsigned int 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 */
@@ -549,8 +563,10 @@ static void do_current_softirqs(void)
do_single_softirq(i);
}
softirq_clr_runner(i);
- unlock_softirq(i);
WARN_ON(current->softirq_nestcnt != 1);
+ local_irq_enable();
+ unlock_softirq(i);
+ local_irq_disable();
}
}
@@ -599,8 +615,8 @@ static void run_ksoftirqd(unsigned int cpu)
do_current_softirqs();
current->softirq_nestcnt--;
- rcu_note_context_switch();
local_irq_enable();
+ cond_resched_rcu_qs();
}
/*
@@ -618,8 +634,12 @@ void thread_do_softirq(void)
static void do_raise_softirq_irqoff(unsigned int nr)
{
+ unsigned int mask;
+
+ mask = 1UL << nr;
+
trace_softirq_raise(nr);
- or_softirq_pending(1UL << nr);
+ or_softirq_pending(mask);
/*
* If we are not in a hard interrupt and inside a bh disabled
@@ -628,16 +648,51 @@ static void do_raise_softirq_irqoff(unsigned int nr)
* 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);
+ current->softirqs_raised |= mask;
+ else if (!__this_cpu_read(ksoftirqd) || !__this_cpu_read(ktimer_softirqd))
+ return;
+
+ if (mask & TIMER_SOFTIRQS)
+ __this_cpu_read(ktimer_softirqd)->softirqs_raised |= mask;
+ else
+ __this_cpu_read(ksoftirqd)->softirqs_raised |= mask;
}
+static void wakeup_proper_softirq(unsigned int nr)
+{
+ if ((1UL << nr) & TIMER_SOFTIRQS)
+ wakeup_timer_softirqd();
+ else
+ wakeup_softirqd();
+}
+
+
void __raise_softirq_irqoff(unsigned int nr)
{
do_raise_softirq_irqoff(nr);
if (!in_irq() && !current->softirq_nestcnt)
- wakeup_softirqd();
+ wakeup_proper_softirq(nr);
+}
+
+/*
+ * Same as __raise_softirq_irqoff() but will process them in ksoftirqd
+ */
+void __raise_softirq_irqoff_ksoft(unsigned int nr)
+{
+ unsigned int mask;
+
+ if (WARN_ON_ONCE(!__this_cpu_read(ksoftirqd) ||
+ !__this_cpu_read(ktimer_softirqd)))
+ return;
+ mask = 1UL << nr;
+
+ trace_softirq_raise(nr);
+ or_softirq_pending(mask);
+ if (mask & TIMER_SOFTIRQS)
+ __this_cpu_read(ktimer_softirqd)->softirqs_raised |= mask;
+ else
+ __this_cpu_read(ksoftirqd)->softirqs_raised |= mask;
+ wakeup_proper_softirq(nr);
}
/*
@@ -663,7 +718,7 @@ void raise_softirq_irqoff(unsigned int nr)
* raise a WARN() if the condition is met.
*/
if (!current->softirq_nestcnt)
- wakeup_softirqd();
+ wakeup_proper_softirq(nr);
}
static inline int ksoftirqd_softirq_pending(void)
@@ -676,22 +731,37 @@ static inline void _local_bh_enable_nort(void) { }
static inline void ksoftirqd_set_sched_params(unsigned int cpu)
{
+ /* Take over all but timer pending softirqs when starting */
+ local_irq_disable();
+ current->softirqs_raised = local_softirq_pending() & ~TIMER_SOFTIRQS;
+ local_irq_enable();
+}
+
+static inline void ktimer_softirqd_set_sched_params(unsigned int cpu)
+{
struct sched_param param = { .sched_priority = 1 };
sched_setscheduler(current, SCHED_FIFO, ¶m);
- /* Take over all pending softirqs when starting */
+
+ /* Take over timer pending softirqs when starting */
local_irq_disable();
- current->softirqs_raised = local_softirq_pending();
+ current->softirqs_raised = local_softirq_pending() & TIMER_SOFTIRQS;
local_irq_enable();
}
-static inline void ksoftirqd_clr_sched_params(unsigned int cpu, bool online)
+static inline void ktimer_softirqd_clr_sched_params(unsigned int cpu,
+ bool online)
{
struct sched_param param = { .sched_priority = 0 };
sched_setscheduler(current, SCHED_NORMAL, ¶m);
}
+static int ktimer_softirqd_should_run(unsigned int cpu)
+{
+ return current->softirqs_raised;
+}
+
#endif /* PREEMPT_RT_FULL */
/*
* Enter an interrupt context.
@@ -741,6 +811,9 @@ static inline void invoke_softirq(void)
if (__this_cpu_read(ksoftirqd) &&
__this_cpu_read(ksoftirqd)->softirqs_raised)
wakeup_softirqd();
+ if (__this_cpu_read(ktimer_softirqd) &&
+ __this_cpu_read(ktimer_softirqd)->softirqs_raised)
+ wakeup_timer_softirqd();
local_irq_restore(flags);
#endif
}
@@ -1173,17 +1246,30 @@ 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",
};
+#ifdef CONFIG_PREEMPT_RT_FULL
+static struct smp_hotplug_thread softirq_timer_threads = {
+ .store = &ktimer_softirqd,
+ .setup = ktimer_softirqd_set_sched_params,
+ .cleanup = ktimer_softirqd_clr_sched_params,
+ .thread_should_run = ktimer_softirqd_should_run,
+ .thread_fn = run_ksoftirqd,
+ .thread_comm = "ktimersoftd/%u",
+};
+#endif
+
static __init int spawn_ksoftirqd(void)
{
register_cpu_notifier(&cpu_nfb);
BUG_ON(smpboot_register_percpu_thread(&softirq_threads));
+#ifdef CONFIG_PREEMPT_RT_FULL
+ BUG_ON(smpboot_register_percpu_thread(&softirq_timer_threads));
+#endif
return 0;
}
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 1af29ad20970..d3ea2452e291 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -30,7 +30,7 @@ struct cpu_stop_done {
atomic_t nr_todo; /* nr left to execute */
bool executed; /* actually executed? */
int ret; /* collected return value */
- struct task_struct *waiter; /* woken when nr_todo reaches 0 */
+ struct completion completion; /* fired if nr_todo reaches 0 */
};
/* the actual stopper, one per every possible cpu, enabled on online cpus */
@@ -56,7 +56,7 @@ static void cpu_stop_init_done(struct cpu_stop_done *done, unsigned int nr_todo)
{
memset(done, 0, sizeof(*done));
atomic_set(&done->nr_todo, nr_todo);
- done->waiter = current;
+ init_completion(&done->completion);
}
/* signal completion unless @done is NULL */
@@ -65,10 +65,8 @@ static void cpu_stop_signal_done(struct cpu_stop_done *done, bool executed)
if (done) {
if (executed)
done->executed = true;
- if (atomic_dec_and_test(&done->nr_todo)) {
- wake_up_process(done->waiter);
- done->waiter = NULL;
- }
+ if (atomic_dec_and_test(&done->nr_todo))
+ complete(&done->completion);
}
}
@@ -91,22 +89,6 @@ static void cpu_stop_queue_work(unsigned int cpu, struct cpu_stop_work *work)
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);
-}
-
/**
* stop_one_cpu - stop a cpu
* @cpu: cpu to stop
@@ -138,7 +120,7 @@ int stop_one_cpu(unsigned int cpu, cpu_stop_fn_t fn, void *arg)
cpu_stop_init_done(&done, 1);
cpu_stop_queue_work(cpu, &work);
- wait_for_stop_done(&done);
+ wait_for_completion(&done.completion);
return done.executed ? done.ret : -ENOENT;
}
@@ -315,7 +297,7 @@ int stop_two_cpus(unsigned int cpu1, unsigned int cpu2, cpu_stop_fn_t fn, void *
lg_local_unlock(&stop_cpus_lock);
preempt_enable_nort();
- wait_for_stop_done(&done);
+ wait_for_completion(&done.completion);
return done.executed ? done.ret : -ENOENT;
}
@@ -380,7 +362,7 @@ static int __stop_cpus(const struct cpumask *cpumask,
cpu_stop_init_done(&done, cpumask_weight(cpumask));
queue_stop_cpus_work(cpumask, fn, arg, &done, false);
- wait_for_stop_done(&done);
+ wait_for_completion(&done.completion);
return done.executed ? done.ret : -ENOENT;
}
@@ -511,13 +493,7 @@ 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;
}
}
@@ -676,7 +652,7 @@ int stop_machine_from_inactive_cpu(int (*fn)(void *), void *data,
ret = multi_cpu_stop(&msdata);
/* Busy wait for completion. */
- while (atomic_read(&done.nr_todo))
+ while (!completion_done(&done.completion))
cpu_relax();
mutex_unlock(&stop_cpus_mutex);
diff --git a/kernel/time/tick-broadcast-hrtimer.c b/kernel/time/tick-broadcast-hrtimer.c
index 6aac4beedbbe..943c03395e46 100644
--- a/kernel/time/tick-broadcast-hrtimer.c
+++ b/kernel/time/tick-broadcast-hrtimer.c
@@ -109,5 +109,6 @@ void tick_setup_hrtimer_broadcast(void)
{
hrtimer_init(&bctimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
bctimer.function = bc_handler;
+ bctimer.irqsafe = true;
clockevents_register_device(&ce_broadcast_hrtimer);
}
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index d0e1d0e48640..0f2d3e3545e8 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -434,13 +434,13 @@ void start_critical_timings(void)
{
if (preempt_trace() || irq_trace())
start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
- trace_preemptirqsoff_hist(TRACE_START, 1);
+ trace_preemptirqsoff_hist_rcuidle(TRACE_START, 1);
}
EXPORT_SYMBOL_GPL(start_critical_timings);
void stop_critical_timings(void)
{
- trace_preemptirqsoff_hist(TRACE_STOP, 0);
+ trace_preemptirqsoff_hist_rcuidle(TRACE_STOP, 0);
if (preempt_trace() || irq_trace())
stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
}
@@ -485,7 +485,7 @@ inline void print_irqtrace_events(struct task_struct *curr)
*/
void trace_hardirqs_on(void)
{
- trace_preemptirqsoff_hist(IRQS_ON, 0);
+ trace_preemptirqsoff_hist_rcuidle(IRQS_ON, 0);
if (!preempt_trace() && irq_trace())
stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
}
@@ -495,7 +495,7 @@ void trace_hardirqs_off(void)
{
if (!preempt_trace() && irq_trace())
start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
- trace_preemptirqsoff_hist(IRQS_OFF, 1);
+ trace_preemptirqsoff_hist_rcuidle(IRQS_OFF, 1);
}
EXPORT_SYMBOL(trace_hardirqs_off);
diff --git a/localversion-rt b/localversion-rt
index 1e584b47c987..9e7cd66d9f44 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt17
+-rt18
diff --git a/net/core/dev.c b/net/core/dev.c
index 16fbef81024d..90c4c45b206c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2883,9 +2883,44 @@ static void skb_update_prio(struct sk_buff *skb)
#define skb_update_prio(skb)
#endif
+#ifdef CONFIG_PREEMPT_RT_FULL
+
+static inline int xmit_rec_read(void)
+{
+ return current->xmit_recursion;
+}
+
+static inline void xmit_rec_inc(void)
+{
+ current->xmit_recursion++;
+}
+
+static inline void xmit_rec_dec(void)
+{
+ current->xmit_recursion--;
+}
+
+#else
+
DEFINE_PER_CPU(int, xmit_recursion);
EXPORT_SYMBOL(xmit_recursion);
+static inline int xmit_rec_read(void)
+{
+ return __this_cpu_read(xmit_recursion);
+}
+
+static inline void xmit_rec_inc(void)
+{
+ __this_cpu_inc(xmit_recursion);
+}
+
+static inline int xmit_rec_dec(void)
+{
+ __this_cpu_dec(xmit_recursion);
+}
+#endif
+
#define RECURSION_LIMIT 10
/**
@@ -2987,7 +3022,7 @@ static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv)
if (txq->xmit_lock_owner != cpu) {
- if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
+ if (xmit_rec_read() > RECURSION_LIMIT)
goto recursion_alert;
skb = validate_xmit_skb(skb, dev);
@@ -2997,9 +3032,9 @@ static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv)
HARD_TX_LOCK(dev, txq, cpu);
if (!netif_xmit_stopped(txq)) {
- __this_cpu_inc(xmit_recursion);
+ xmit_rec_inc();
skb = dev_hard_start_xmit(skb, dev, txq, &rc);
- __this_cpu_dec(xmit_recursion);
+ xmit_rec_dec();
if (dev_xmit_complete(rc)) {
HARD_TX_UNLOCK(dev, txq);
goto out;
@@ -4755,7 +4790,7 @@ static void net_rx_action(struct softirq_action *h)
list_splice_tail(&repoll, &list);
list_splice(&list, &sd->poll_list);
if (!list_empty(&sd->poll_list))
- __raise_softirq_irqoff(NET_RX_SOFTIRQ);
+ __raise_softirq_irqoff_ksoft(NET_RX_SOFTIRQ);
net_rps_action_and_irq_enable(sd);
}
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 36c138197f37..df293d45e0cd 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -358,6 +358,7 @@ struct netdev_alloc_cache {
static DEFINE_PER_CPU(struct netdev_alloc_cache, netdev_alloc_cache);
static DEFINE_PER_CPU(struct netdev_alloc_cache, napi_alloc_cache);
static DEFINE_LOCAL_IRQ_LOCK(netdev_alloc_lock);
+static DEFINE_LOCAL_IRQ_LOCK(napi_alloc_cache_lock);
static struct page *__page_frag_refill(struct netdev_alloc_cache *nc,
gfp_t gfp_mask)
@@ -456,7 +457,12 @@ EXPORT_SYMBOL(netdev_alloc_frag);
static void *__napi_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
{
- return __alloc_page_frag(&napi_alloc_cache, fragsz, gfp_mask);
+ void *data;
+
+ local_lock(napi_alloc_cache_lock);
+ data = __alloc_page_frag(&napi_alloc_cache, fragsz, gfp_mask);
+ local_unlock(napi_alloc_cache_lock);
+ return data;
}
void *napi_alloc_frag(unsigned int fragsz)
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