From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Tue, 9 Nov 2010 13:36:52 +0000 (+0100)
Subject: sched: Fix runnable condition for stoptask
X-Git-Tag: v2.6.37-rc3~29^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2d46709082c062cae7cce1a15f8cd4cd81b92d88;p=pandora-kernel.git

sched: Fix runnable condition for stoptask

Heiko reported that the TASK_RUNNING check is not sufficient for
CONFIG_PREEMPT=y since we can get preempted with !TASK_RUNNING.

He suggested adding a ->se.on_rq test to the existing TASK_RUNNING
one, however TASK_RUNNING will always have ->se.on_rq, so we might as
well reduce that to a single test.

[ stop tasks should never get preempted, but its good to handle
  this case correctly should this ever happen ]

Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com>
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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