sched/__wake_up_sync_key(): Fix nr_exclusive tasks which lead to WF_SYNC clearing · cedce3e730 - Gogs

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>

Kirill Tkhai 12 years ago

parent

971ee28cbd

commit

cedce3e730

1 changed files with 1 additions and 1 deletions

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							+ 1
							
							- 1
						
kernel/sched/core.c
							 
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				@@ -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);