From: Peter Zijlstra <peterz@infradead.org>
Date: Wed, 15 Oct 2008 18:37:23 +0000 (+0200)
Subject: sched: only update rq->clock while holding rq->lock
X-Git-Tag: v2.6.28-rc1~43^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8cd162ce230b154e564a1285bb5f89fcf73f0dce;p=pandora-kernel.git

sched: only update rq->clock while holding rq->lock

Vatsa noticed rq->clock going funny and tracked it down to an update_rq_clock()
outside a rq->lock section.

This is a problem because things like double_rq_lock() update the rq->clock
value for both rqs. Therefore disabling interrupts isn't strong enough.

Reported-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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