From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Sat, 15 Nov 2008 01:37:44 +0000 (+0100)
Subject: tracing/function-return-tracer: add a barrier to ensure return stack index is increme... 
X-Git-Tag: v2.6.29-rc1~586^2~58^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b01c746617da5e260803eb10ed64ca043e9a1241;p=pandora-kernel.git

tracing/function-return-tracer: add a barrier to ensure return stack index is incremented in memory

Impact: fix possible race condition in ftrace function return tracer

This fixes a possible race condition if index incrementation
is not immediately flushed in memory.

Thanks for Andi Kleen and Steven Rostedt for pointing out this issue
and give me this solution.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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