commit b01c746617da5e260803eb10ed64ca043e9a1241
author Frederic Weisbecker <fweisbec@gmail.com> Sat Nov 15 02:37:44 2008 +0100
committer Ingo Molnar <mingo@elte.hu> Sun Nov 16 07:57:37 2008 +0100
tree 7b835904f337778b604048169dd064a87149aa99
parent 985809608f758a8d3ddda4ce5a53ed0e57fb9e1b

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>