From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Mon, 15 Feb 2010 13:45:54 +0000 (+0100)
Subject: sched: Fix race between ttwu() and task_rq_lock()
X-Git-Tag: v2.6.34-rc1~261^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0970d2992dfd7d5ec2c787417cf464f01eeaf42a;p=pandora-kernel.git

sched: Fix race between ttwu() and task_rq_lock()

Thomas found that due to ttwu() changing a task's cpu without holding
the rq->lock, task_rq_lock() might end up locking the wrong rq.

Avoid this by serializing against TASK_WAKING.

Reported-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1266241712.15770.420.camel@laptop>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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