[PATCH v1 1/2] perf auxtrace: Change to use SMP memory barriers

[Leo Yan <leo.yan@linaro.org>]

The AUX ring buffer's head and tail can be accessed from multiple CPUs
on SMP system, so changes to use SMP memory barriers to replace the
uniprocessor barriers.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
 tools/perf/util/auxtrace.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index 472c0973b1f1..8bed284ccc82 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -452,7 +452,7 @@ static inline u64 auxtrace_mmap__read_snapshot_head(struct auxtrace_mmap *mm)
 	u64 head = READ_ONCE(pc->aux_head);
 
 	/* Ensure all reads are done after we read the head */
-	rmb();
+	smp_rmb();
 	return head;
 }
 
@@ -466,7 +466,7 @@ static inline u64 auxtrace_mmap__read_head(struct auxtrace_mmap *mm)
 #endif
 
 	/* Ensure all reads are done after we read the head */
-	rmb();
+	smp_rmb();
 	return head;
 }
 
@@ -478,7 +478,7 @@ static inline void auxtrace_mmap__write_tail(struct auxtrace_mmap *mm, u64 tail)
 #endif
 
 	/* Ensure all reads are done before we write the tail out */
-	mb();
+	smp_mb();
 #if BITS_PER_LONG == 64 || !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
 	pc->aux_tail = tail;
 #else
-- 
2.25.1