From: Huang Ying <ying.huang@intel.com>
Date: Thu, 8 Sep 2011 06:00:44 +0000 (+0800)
Subject: llist: Move cpu_relax() to after the cmpxchg()
X-Git-Tag: v3.2-rc1~161^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a3127336b71f6833d1483c856dce91fe558dc3a9;p=pandora-kernel.git

llist: Move cpu_relax() to after the cmpxchg()

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: Huang Ying <ying.huang@intel.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1315461646-1379-4-git-send-email-ying.huang@intel.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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