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由 Huang Ying 提交于
If in llist_add()/etc. functions the first cmpxchg() call succeeds, it is not necessary to use cpu_relax() before the cmpxchg(). So cpu_relax() in a busy loop involving cmpxchg() should go after cmpxchg() instead of before that. This patch fixes this for all involved llist functions. Signed-off-by: NHuang Ying <ying.huang@intel.com> Acked-by: NMathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1315461646-1379-4-git-send-email-ying.huang@intel.comSigned-off-by: NIngo Molnar <mingo@elte.hu>
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