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Message-ID: <20140717112636.5cbac13c@gandalf.local.home>
Date: Thu, 17 Jul 2014 11:26:36 -0400
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] 3.2.60-rt89
Dear RT Folks,
I'm pleased to announce the 3.2.60-rt89 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: v3.2-rt
Head SHA1: 28dbf3f4acae4140e2b56cfa507f3fe623052269
Or to build 3.2.60-rt89 directly, the following patches should be applied:
http://www.kernel.org/pub/linux/kernel/v3.x/linux-3.2.tar.xz
http://www.kernel.org/pub/linux/kernel/v3.x/patch-3.2.60.xz
http://www.kernel.org/pub/linux/kernel/projects/rt/3.2/patch-3.2.60-rt89.patch.xz
You can also build from 3.2.60-rt88 by applying the incremental patch:
http://www.kernel.org/pub/linux/kernel/projects/rt/3.2/incr/patch-3.2.60-rt88-rt89.patch.xz
Enjoy,
-- Steve
Changes from v3.2.60-rt88:
---
Steven Rostedt (1):
sched: Do not clear PF_NO_SETAFFINITY flag in select_fallback_rq()
Steven Rostedt (Red Hat) (1):
Linux 3.2.60-rt89
Thomas Gleixner (1):
workqueue: Prevent deadlock/stall on RT
Zhao Hongjiang (1):
hrtimer:fix the miss of hrtimer_peek_ahead_timers in nort code
----
kernel/hrtimer.c | 6 +++++-
kernel/sched.c | 16 +++++-----------
kernel/workqueue.c | 41 +++++++++++++++++++++++++++++++++++------
localversion-rt | 2 +-
4 files changed, 46 insertions(+), 19 deletions(-)
---------------------------
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 2bd88f06a6d0..928473aa0aec 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1452,7 +1452,11 @@ static int hrtimer_rt_defer(struct hrtimer *timer)
#else
-static inline void hrtimer_rt_run_pending(void) { }
+static inline void hrtimer_rt_run_pending(void)
+{
+ hrtimer_peek_ahead_timers();
+}
+
static inline int hrtimer_rt_defer(struct hrtimer *timer) { return 0; }
#endif
diff --git a/kernel/sched.c b/kernel/sched.c
index 9942f012908d..7fb61d32d771 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2572,12 +2572,6 @@ static int select_fallback_rq(int cpu, struct task_struct *p)
printk(KERN_INFO "process %d (%s) no longer affine to cpu%d\n",
task_pid_nr(p), p->comm, cpu);
}
- /*
- * Clear PF_THREAD_BOUND, otherwise we wreckage
- * migrate_disable/enable. See optimization for
- * PF_THREAD_BOUND tasks there.
- */
- p->flags &= ~PF_THREAD_BOUND;
return dest_cpu;
}
@@ -4801,9 +4795,8 @@ 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.
@@ -4813,6 +4806,10 @@ static inline void sched_submit_work(struct task_struct *tsk)
if (tsk->flags & PF_WQ_WORKER && !tsk->saved_state)
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.
@@ -4823,9 +4820,6 @@ static inline void sched_submit_work(struct task_struct *tsk)
static inline void sched_update_worker(struct task_struct *tsk)
{
- if (tsk_is_pi_blocked(tsk))
- return;
-
if (tsk->flags & PF_WQ_WORKER)
wq_worker_running(tsk);
}
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 62ebed73dfa2..505b50dff3b5 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -319,6 +319,31 @@ static inline int __next_wq_cpu(int cpu, const struct cpumask *mask,
(cpu) < WORK_CPU_NONE; \
(cpu) = __next_wq_cpu((cpu), cpu_possible_mask, (wq)))
+#ifdef CONFIG_PREEMPT_RT_BASE
+static inline void rt_lock_idle_list(struct global_cwq *gcwq)
+{
+ preempt_disable();
+}
+static inline void rt_unlock_idle_list(struct global_cwq *gcwq)
+{
+ preempt_enable();
+}
+static inline void sched_lock_idle_list(struct global_cwq *gcwq) { }
+static inline void sched_unlock_idle_list(struct global_cwq *gcwq) { }
+#else
+static inline void rt_lock_idle_list(struct global_cwq *gcwq) { }
+static inline void rt_unlock_idle_list(struct global_cwq *gcwq) { }
+static inline void sched_lock_idle_list(struct global_cwq *gcwq)
+{
+ spin_lock_irq(&gcwq->lock);
+}
+static inline void sched_unlock_idle_list(struct global_cwq *gcwq)
+{
+ spin_unlock_irq(&gcwq->lock);
+}
+#endif
+
+
#ifdef CONFIG_DEBUG_OBJECTS_WORK
static struct debug_obj_descr work_debug_descr;
@@ -655,10 +680,16 @@ static struct worker *first_worker(struct global_cwq *gcwq)
*/
static void wake_up_worker(struct global_cwq *gcwq)
{
- struct worker *worker = first_worker(gcwq);
+ struct worker *worker;
+
+ rt_lock_idle_list(gcwq);
+
+ worker = first_worker(gcwq);
if (likely(worker))
wake_up_process(worker->task);
+
+ rt_unlock_idle_list(gcwq);
}
/**
@@ -701,7 +732,6 @@ void wq_worker_sleeping(struct task_struct *task)
cpu = smp_processor_id();
gcwq = get_gcwq(cpu);
- spin_lock_irq(&gcwq->lock);
/*
* The counterpart of the following dec_and_test, implied mb,
* worklist not empty test sequence is in insert_work().
@@ -709,11 +739,10 @@ void wq_worker_sleeping(struct task_struct *task)
*/
if (atomic_dec_and_test(get_gcwq_nr_running(cpu)) &&
!list_empty(&gcwq->worklist)) {
- worker = first_worker(gcwq);
- if (worker)
- wake_up_process(worker->task);
+ sched_lock_idle_list(gcwq);
+ wake_up_worker(gcwq);
+ sched_unlock_idle_list(gcwq);
}
- spin_unlock_irq(&gcwq->lock);
}
/**
diff --git a/localversion-rt b/localversion-rt
index 666227d921a3..d2a40223e4b7 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt88
+-rt89
--
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