[tip:perf/core] perf tools: Use ACCESS_ONCE() instead of volatile cast

From: tip-bot for Pranith Kumar
Date: Sat Sep 27 2014 - 03:25:55 EST

Commit-ID: 1da34daf24823f19cfd56c97973334cd95635926
Gitweb: http://git.kernel.org/tip/1da34daf24823f19cfd56c97973334cd95635926
Author: Pranith Kumar <bobby.prani@xxxxxxxxx>
AuthorDate: Tue, 23 Sep 2014 10:55:08 -0400
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 26 Sep 2014 12:36:03 -0300

perf tools: Use ACCESS_ONCE() instead of volatile cast

Use ACCESS_ONCE() instead of the cast to volatile and read. This is just
a style change which is reader friendly.

Signed-off-by: Pranith Kumar <bobby.prani@xxxxxxxxx>
Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1411484109-10442-1-git-send-email-bobby.prani@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
tools/perf/util/session.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 8dd41ca..ffb4404 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -126,5 +126,5 @@ int __perf_session__set_tracepoints_handlers(struct perf_session *session,

extern volatile int session_done;

-#define session_done() (*(volatile int *)(&session_done))
+#define session_done() ACCESS_ONCE(session_done)
#endif /* __PERF_SESSION_H */
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