From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Tue, 24 Apr 2012 22:30:36 +0000 (+0200)
Subject: sched/fair: Add some serialization to the sched_domain load-balance walk
X-Git-Tag: v3.5-rc1~140^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0ce90475dcdbe90affc218e9688c8401e468e84d;p=pandora-kernel.git

sched/fair: Add some serialization to the sched_domain load-balance walk

Since the sched_domain walk is completely unserialized (!SD_SERIALIZE)
it is possible that multiple cpus in the group get elected to do the
next level. Avoid this by adding some serialization.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-vqh9ai6s0ewmeakjz80w4qz6@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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