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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>