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

[tip-bot for Pranith Kumar <tipbot@zytor.com>]

Commit-ID:  1da34daf24823f19cfd56c97973334cd95635926
Gitweb:     http://git.kernel.org/tip/1da34daf24823f19cfd56c97973334cd95635926
Author:     Pranith Kumar <bobby.prani@gmail.com>
AuthorDate: Tue, 23 Sep 2014 10:55:08 -0400
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
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@gmail.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1411484109-10442-1-git-send-email-bobby.prani@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 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 */