tree 5f0077dcafda733ef3f1e41d218a473978ce6a9f
parent 9000f05c6d1607f79c0deacf42b09693be673f4c
author Peter Zijlstra <a.p.zijlstra@chello.nl> 1266241554 +0100
committer Thomas Gleixner <tglx@linutronix.de> 1266329639 +0100

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>