From: Yinghai Lu <yinghai@kernel.org>
Date: Sat, 27 Dec 2008 05:05:06 +0000 (-0800)
Subject: perf_counter: more barrier in blank weak function
X-Git-Tag: v2.6.31-rc1~383^2~536
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=01ea1ccaa24dea3552e103be13b7897211607a8b;p=pandora-kernel.git

perf_counter: more barrier in blank weak function

Impact: fix panic possible panic

Some versions of GCC inline the weak global function if it's empty.
Add a barrier() to work it around.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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