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

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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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Frederic Weisbecker 2008-11-15 02:37:44 +01:00 • committed by Ingo Molnar

parent 985809608f

commit b01c746617

1 changed files with 1 additions and 0 deletions

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arch/x86/kernel/ftrace.c

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