From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 27 Nov 2009 13:12:25 +0000 (+0100)
Subject: sched: Remove rq->clock coupling from set_task_cpu()
X-Git-Tag: v2.6.33-rc1~298^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5afcdab706d6002cb02b567ba46e650215e694e8;p=pandora-kernel.git

sched: Remove rq->clock coupling from set_task_cpu()

set_task_cpu() should be rq invariant and only touch task state, it
currently fails to do so, which opens up a few races, since not all
callers hold both rq->locks.

Remove the relyance on rq->clock, as any site calling set_task_cpu()
should also do a remote clock update, which should ensure the observed
time between these two cpus is monotonic, as per
kernel/sched_clock.c:sched_clock_remote().

Therefore we can simply remove the clock_offset bits and be happy.

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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