From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Tue, 15 Sep 2009 12:43:03 +0000 (+0200)
Subject: sched: Add TASK_WAKING
X-Git-Tag: v2.6.32-rc1~652^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e9c8431185d6c406887190519f6dbdd112641686;p=pandora-kernel.git

sched: Add TASK_WAKING

We're going to want to drop rq->lock in try_to_wake_up() for a
longer period of time, however we also want to deal with concurrent
waking of the same task, which is currently handled by holding
rq->lock.

So introduce a new TASK state, namely TASK_WAKING, which indicates
someone is already waking the task (other wakers will fail p->state
& state).

We also keep preemption disabled over the whole ttwu().

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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