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    Subject[PATCH v3 08/10] perf auxtrace: Use WRITE_ONCE() for updating aux_tail
    Date
    Use WRITE_ONCE() for updating aux_tail, so can avoid unexpected memory
    behaviour.

    Signed-off-by: Leo Yan <leo.yan@linaro.org>
    Acked-by: Adrian Hunter <adrian.hunter@intel.com>
    Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    ---
    tools/perf/util/auxtrace.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
    index 1a2f42980e3f..d68a5e80b217 100644
    --- a/tools/perf/util/auxtrace.h
    +++ b/tools/perf/util/auxtrace.h
    @@ -456,7 +456,7 @@ static inline void auxtrace_mmap__write_tail(struct auxtrace_mmap *mm, u64 tail)

    /* Ensure all reads are done before we write the tail out */
    smp_mb();
    - pc->aux_tail = tail;
    + WRITE_ONCE(pc->aux_tail, tail);
    }

    int auxtrace_mmap__mmap(struct auxtrace_mmap *mm,
    --
    2.25.1
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