Commit cedce3e7 authored Jul 04, 2013 by Kirill Tkhai Committed by Ingo Molnar Jul 12, 2013

sched/__wake_up_sync_key(): Fix nr_exclusive tasks which lead to WF_SYNC clearing



Only one task can replace the waker.

Signed-off-by: Kirill Tkhai <tkhai@yandex.ru>
CC: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/512421372963700@web25f.yandex.ru


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 971ee28c

kernel/sched/core.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2660,7 +2660,7 @@ void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode,
		if (unlikely(!q))
		return;

		if (unlikely(!nr_exclusive))
		if (unlikely(nr_exclusive != 1))
		wake_flags = 0;

		spin_lock_irqsave(&q->lock, flags);