[ANNOUNCE] 3.10.97-rt106
From: Steven Rostedt
Date: Mon Feb 29 2016 - 12:06:47 EST
Dear RT Folks,
I'm pleased to announce the 3.10.97-rt106 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: v3.10-rt
Head SHA1: 141a4ed5a87365316b29491b6b982d102d79d754
Or to build 3.10.97-rt106 directly, the following patches should be applied:
http://www.kernel.org/pub/linux/kernel/v3.x/linux-3.10.tar.xz
http://www.kernel.org/pub/linux/kernel/v3.x/patch-3.10.97.xz
http://www.kernel.org/pub/linux/kernel/projects/rt/3.10/patch-3.10.97-rt106.patch.xz
You can also build from 3.10.97-rt105 by applying the incremental patch:
http://www.kernel.org/pub/linux/kernel/projects/rt/3.10/incr/patch-3.10.97-rt105-rt106.patch.xz
Enjoy,
-- Steve
Changes from v3.10.97-rt105:
---
Grygorii Strashko (2):
ARM: smp: Move clear_tasks_mm_cpumask() call to __cpu_die()
net/core/cpuhotplug: Drain input_pkt_queue lockless
Josh Cartwright (1):
net: Make synchronize_rcu_expedited() conditional on !RT_FULL
Peter Zijlstra (1):
sched: Introduce the trace_sched_waking tracepoint
Sebastian Andrzej Siewior (1):
dump stack: don't disable preemption during trace
Steven Rostedt (Red Hat) (2):
rtmutex: Have slowfn of rt_mutex_timed_fastlock() use enum
Linux 3.10.97-rt106
Thomas Gleixner (2):
rtmutex: Handle non enqueued waiters gracefully
irqwork: Move irq safe work to irq context
bmouring@xxxxxx (1):
rtmutex: Use chainwalking control enum
----
arch/arm/kernel/smp.c | 5 +++--
arch/x86/kernel/dumpstack_64.c | 8 ++++----
include/linux/irq_work.h | 6 ++++++
include/trace/events/sched.h | 30 +++++++++++++++++++++---------
kernel/irq_work.c | 9 +++++++++
kernel/rtmutex.c | 6 +++---
kernel/sched/core.c | 8 +++++---
kernel/timer.c | 6 ++----
kernel/trace/trace_sched_switch.c | 2 +-
kernel/trace/trace_sched_wakeup.c | 2 +-
localversion-rt | 2 +-
net/core/dev.c | 4 ++--
12 files changed, 58 insertions(+), 30 deletions(-)
---------------------------
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 5919eb451bb9..7ad24aa57040 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -192,8 +192,6 @@ int __cpuinit __cpu_disable(void)
flush_cache_louis();
local_flush_tlb_all();
- clear_tasks_mm_cpumask(cpu);
-
return 0;
}
@@ -209,6 +207,9 @@ void __cpuinit __cpu_die(unsigned int cpu)
pr_err("CPU%u: cpu didn't die\n", cpu);
return;
}
+
+ clear_tasks_mm_cpumask(cpu);
+
printk(KERN_NOTICE "CPU%u: shutdown\n", cpu);
/*
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index 66e274a3d968..37aee503a7ba 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -114,7 +114,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack, unsigned long bp,
const struct stacktrace_ops *ops, void *data)
{
- const unsigned cpu = get_cpu();
+ const unsigned cpu = get_cpu_light();
unsigned long *irq_stack_end =
(unsigned long *)per_cpu(irq_stack_ptr, cpu);
unsigned used = 0;
@@ -191,7 +191,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
* This handles the process stack:
*/
bp = ops->walk_stack(tinfo, stack, bp, ops, data, NULL, &graph);
- put_cpu();
+ put_cpu_light();
}
EXPORT_SYMBOL(dump_trace);
@@ -205,7 +205,7 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
int cpu;
int i;
- preempt_disable();
+ migrate_disable();
cpu = smp_processor_id();
irq_stack_end = (unsigned long *)(per_cpu(irq_stack_ptr, cpu));
@@ -238,7 +238,7 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
pr_cont(" %016lx", *stack++);
touch_nmi_watchdog();
}
- preempt_enable();
+ migrate_enable();
pr_cont("\n");
show_trace_log_lvl(task, regs, sp, bp, log_lvl);
diff --git a/include/linux/irq_work.h b/include/linux/irq_work.h
index 4a8c7a2df480..ccd736ebee9e 100644
--- a/include/linux/irq_work.h
+++ b/include/linux/irq_work.h
@@ -44,4 +44,10 @@ bool irq_work_needs_cpu(void);
static inline bool irq_work_needs_cpu(void) { return false; }
#endif
+#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_PREEMPT_RT_FULL)
+void irq_work_tick_soft(void);
+#else
+static inline void irq_work_tick_soft(void) { }
+#endif
+
#endif /* _LINUX_IRQ_WORK_H */
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index e5586caff67a..1ff7042e572d 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -55,9 +55,9 @@ TRACE_EVENT(sched_kthread_stop_ret,
*/
DECLARE_EVENT_CLASS(sched_wakeup_template,
- TP_PROTO(struct task_struct *p, int success),
+ TP_PROTO(struct task_struct *p),
- TP_ARGS(p, success),
+ TP_ARGS(p),
TP_STRUCT__entry(
__array( char, comm, TASK_COMM_LEN )
@@ -71,28 +71,40 @@ DECLARE_EVENT_CLASS(sched_wakeup_template,
memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
__entry->pid = p->pid;
__entry->prio = p->prio;
- __entry->success = success;
+ __entry->success = 1; /* rudiment, kill when possible */
__entry->target_cpu = task_cpu(p);
)
TP_perf_assign(
__perf_task(p);
),
- TP_printk("comm=%s pid=%d prio=%d success=%d target_cpu=%03d",
+ TP_printk("comm=%s pid=%d prio=%d target_cpu=%03d",
__entry->comm, __entry->pid, __entry->prio,
- __entry->success, __entry->target_cpu)
+ __entry->target_cpu)
);
+/*
+ * Tracepoint called when waking a task; this tracepoint is guaranteed to be
+ * called from the waking context.
+ */
+DEFINE_EVENT(sched_wakeup_template, sched_waking,
+ TP_PROTO(struct task_struct *p),
+ TP_ARGS(p));
+
+/*
+ * Tracepoint called when the task is actually woken; p->state == TASK_RUNNNG.
+ * It it not always called from the waking context.
+ */
DEFINE_EVENT(sched_wakeup_template, sched_wakeup,
- TP_PROTO(struct task_struct *p, int success),
- TP_ARGS(p, success));
+ TP_PROTO(struct task_struct *p),
+ TP_ARGS(p));
/*
* Tracepoint for waking up a new task:
*/
DEFINE_EVENT(sched_wakeup_template, sched_wakeup_new,
- TP_PROTO(struct task_struct *p, int success),
- TP_ARGS(p, success));
+ TP_PROTO(struct task_struct *p),
+ TP_ARGS(p));
#ifdef CREATE_TRACE_POINTS
static inline long __trace_sched_switch_state(struct task_struct *p)
diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index af8ceafc94e4..883bb73698b9 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -163,8 +163,17 @@ void irq_work_tick(void)
if (!llist_empty(raised) && !arch_irq_work_has_interrupt())
irq_work_run_list(raised);
+
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT_FULL))
+ irq_work_run_list(this_cpu_ptr(&lazy_list));
+}
+
+#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_PREEMPT_RT_FULL)
+void irq_work_tick_soft(void)
+{
irq_work_run_list(this_cpu_ptr(&lazy_list));
}
+#endif
/*
* Synchronize against the irq_work @entry, ensures the entry is not
diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index 5388ba98acaf..a809539f443c 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -1166,7 +1166,7 @@ static void noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
__set_current_state(TASK_UNINTERRUPTIBLE);
pi_unlock(&self->pi_lock);
- ret = task_blocks_on_rt_mutex(lock, &waiter, self, 0);
+ ret = task_blocks_on_rt_mutex(lock, &waiter, self, RT_MUTEX_MIN_CHAINWALK);
BUG_ON(ret);
for (;;) {
@@ -1636,7 +1636,7 @@ rt_mutex_timed_fastlock(struct rt_mutex *lock, int state,
enum rtmutex_chainwalk chwalk,
int (*slowfn)(struct rt_mutex *lock, int state,
struct hrtimer_sleeper *timeout,
- int detect_deadlock))
+ enum rtmutex_chainwalk chwalk))
{
if (chwalk == RT_MUTEX_MIN_CHAINWALK &&
likely(rt_mutex_cmpxchg(lock, NULL, current))) {
@@ -1914,7 +1914,7 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
ret = 0;
}
- if (unlikely(ret))
+ if (ret && rt_mutex_has_waiters(lock))
remove_waiter(lock, waiter);
raw_spin_unlock(&lock->wait_lock);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 23e289ae4270..6c21a28689b9 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1394,9 +1394,9 @@ static void
ttwu_do_wakeup(struct rq *rq, struct task_struct *p, int wake_flags)
{
check_preempt_curr(rq, p, wake_flags);
- trace_sched_wakeup(p, true);
-
p->state = TASK_RUNNING;
+ trace_sched_wakeup(p);
+
#ifdef CONFIG_SMP
if (p->sched_class->task_woken)
p->sched_class->task_woken(rq, p);
@@ -1579,6 +1579,8 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
if (!(wake_flags & WF_LOCK_SLEEPER))
p->saved_state = TASK_RUNNING;
+ trace_sched_waking(p);
+
success = 1; /* we're going to change ->state */
cpu = task_cpu(p);
@@ -1830,7 +1832,7 @@ void wake_up_new_task(struct task_struct *p)
rq = __task_rq_lock(p);
activate_task(rq, p, 0);
p->on_rq = 1;
- trace_sched_wakeup_new(p, true);
+ trace_sched_wakeup_new(p);
check_preempt_curr(rq, p, WF_FORK);
#ifdef CONFIG_SMP
if (p->sched_class->task_woken)
diff --git a/kernel/timer.c b/kernel/timer.c
index ff272e20ee0c..2fd6ea5c6519 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1450,7 +1450,7 @@ void update_process_times(int user_tick)
scheduler_tick();
run_local_timers();
rcu_check_callbacks(cpu, user_tick);
-#if defined(CONFIG_IRQ_WORK) && !defined(CONFIG_PREEMPT_RT_FULL)
+#if defined(CONFIG_IRQ_WORK)
if (in_irq())
irq_work_run();
#endif
@@ -1466,9 +1466,7 @@ static void run_timer_softirq(struct softirq_action *h)
hrtimer_run_pending();
-#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_PREEMPT_RT_FULL)
- irq_work_tick();
-#endif
+ irq_work_tick_soft();
if (time_after_eq(jiffies, base->timer_jiffies))
__run_timers(base);
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index 4e98e3b257a3..82fe794af532 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -106,7 +106,7 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
}
static void
-probe_sched_wakeup(void *ignore, struct task_struct *wakee, int success)
+probe_sched_wakeup(void *ignore, struct task_struct *wakee)
{
struct trace_array_cpu *data;
unsigned long flags;
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index fee77e15d815..8e967ca56006 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -458,7 +458,7 @@ static void wakeup_reset(struct trace_array *tr)
}
static void
-probe_wakeup(void *ignore, struct task_struct *p, int success)
+probe_wakeup(void *ignore, struct task_struct *p)
{
struct trace_array_cpu *data;
int cpu = smp_processor_id();
diff --git a/localversion-rt b/localversion-rt
index b4e5b00e24e1..8111d0b4d38d 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt105
+-rt106
diff --git a/net/core/dev.c b/net/core/dev.c
index a478f77e4322..864f7ae42c08 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5838,7 +5838,7 @@ EXPORT_SYMBOL(free_netdev);
void synchronize_net(void)
{
might_sleep();
- if (rtnl_is_locked())
+ if (rtnl_is_locked() && !IS_ENABLED(CONFIG_PREEMPT_RT_FULL))
synchronize_rcu_expedited();
else
synchronize_rcu();
@@ -6088,7 +6088,7 @@ static int dev_cpu_callback(struct notifier_block *nfb,
netif_rx(skb);
input_queue_head_incr(oldsd);
}
- while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) {
+ while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
netif_rx(skb);
input_queue_head_incr(oldsd);
}