linux-kernel - [PATCH] sched, __wake_up_sync_key: Fix nr_exclusive tasks which lead to WF

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Message-Id: <512421372963700@web25f.yandex.ru>
Date:	Thu, 04 Jul 2013 22:48:20 +0400
From:	Kirill Tkhai <tkhai@...dex.ru>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: [PATCH] sched, __wake_up_sync_key: Fix nr_exclusive tasks which lead to WF_SYNC clearing

The only one task can replace waker.

Signed-off-by: Kirill Tkhai <tkhai@...dex.ru>
CC: Steven Rostedt <rostedt@...dmis.org>
CC: Ingo Molnar <mingo@...hat.com>
CC: Peter Zijlstra <peterz@...radead.org>
---
 kernel/sched/core.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 9d06ad6..4ff7404 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2658,7 +2658,7 @@ 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);
--
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