[PATCH v4 05/11] perf auxtrace: Use WRITE_ONCE() for updating aux_tail
From: Leo Yan <hidden>
Date: 2021-07-11 10:41:36
Also in:
linux-perf-users, lkml
Subsystem:
performance events subsystem, the rest · Maintainers:
Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
Use WRITE_ONCE() for updating aux_tail, so can avoid unexpected memory behaviour. Signed-off-by: Leo Yan <redacted> 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 cc1c1b9cec9c..79227b8864cd 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h@@ -480,7 +480,7 @@ 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(); #if BITS_PER_LONG == 64 || !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT) - pc->aux_tail = tail; + WRITE_ONCE(pc->aux_tail, tail); #else do { old_tail = __sync_val_compare_and_swap(&pc->aux_tail, 0, 0);
--
2.25.1
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