Messages in this thread Patch in this message | | | From | Leo Yan <> | Subject | [PATCH v3 08/10] perf auxtrace: Use WRITE_ONCE() for updating aux_tail | Date | Sun, 4 Jul 2021 15:16:42 +0800 |
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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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