[ANNOUNCE] 3.4.97-rt121

[Steven Rostedt]

Dear RT Folks,

I'm pleased to announce the 3.4.97-rt121 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: v3.4-rt
  Head SHA1: 819dd8a63540f5e696a4b5c2d7aba657d9e86dce


Or to build 3.4.97-rt121 directly, the following patches should be applied:

  http://www.kernel.org/pub/linux/kernel/v3.x/linux-3.4.tar.xz

  http://www.kernel.org/pub/linux/kernel/v3.x/patch-3.4.97.xz

  http://www.kernel.org/pub/linux/kernel/projects/rt/3.4/patch-3.4.97-rt121.patch.xz



You can also build from 3.4.97-rt120 by applying the incremental patch:

  http://www.kernel.org/pub/linux/kernel/projects/rt/3.4/incr/patch-3.4.97-rt120-rt121.patch.xz



Enjoy,

-- Steve


Changes from v3.4.97-rt120:

---

Steven Rostedt (1):
      sched: Do not clear PF_NO_SETAFFINITY flag in select_fallback_rq()

Steven Rostedt (Red Hat) (1):
      Linux 3.4.97-rt121

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/core.c | 13 +++++--------
 kernel/workqueue.c  | 41 +++++++++++++++++++++++++++++++++++------
 localversion-rt     |  2 +-
 4 files changed, 46 insertions(+), 16 deletions(-)
---------------------------
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 3f7d3b5b0717..afb62c7cc494 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1457,7 +1457,11 @@ 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/core.c b/kernel/sched/core.c
index 1199054adb2e..5ba55a8b26e0 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1325,12 +1325,6 @@ out:
 		}
 	}
 
-	/*
-	 * 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;
 }
 
@@ -3580,9 +3574,8 @@ 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.
@@ -3592,6 +3585,10 @@ 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.
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 4d21bfdc1637..653d7fccb762 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;
@@ -650,10 +675,16 @@ 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);
 }
 
 /**
@@ -696,7 +727,6 @@ 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().
@@ -704,11 +734,10 @@ 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 fff72aad59ab..8188d85cffe0 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt120
+-rt121
--
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