From: Andrew Morton <akpm@linux-foundation.org>
Date: Sat, 19 Sep 2009 18:55:44 +0000 (-0700)
Subject: sched: Fix raciness in runqueue_is_locked()
X-Git-Tag: v2.6.32-rc1~614^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=89f19f04dc72363d912fd007a399cb10310eff6e;p=pandora-kernel.git

sched: Fix raciness in runqueue_is_locked()

runqueue_is_locked() is unavoidably racy due to a poor interface design.
It does

	cpu = get_cpu()
	ret = some_perpcu_thing(cpu);
	put_cpu(cpu);
	return ret;

Its return value is unreliable.

Fix.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <200909191855.n8JItiko022148@imap1.linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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