linux-kernel - [tip:perf/core] perf tools: Use ACCESS

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Date:	Sat, 27 Sep 2014 00:25:23 -0700
From:	tip-bot for Pranith Kumar <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, paulus@...ba.org,
	mingo@...hat.com, hpa@...or.com, mingo@...nel.org,
	jolsa@...nel.org, bobby.prani@...il.com, a.p.zijlstra@...llo.nl,
	namhyung@...nel.org, adrian.hunter@...el.com, dsahern@...il.com,
	tglx@...utronix.de
Subject: [tip:perf/core] perf tools: Use ACCESS_ONCE()
  instead of volatile cast

Commit-ID:  1da34daf24823f19cfd56c97973334cd95635926
Gitweb:     http://git.kernel.org/tip/1da34daf24823f19cfd56c97973334cd95635926
Author:     Pranith Kumar <bobby.prani@...il.com>
AuthorDate: Tue, 23 Sep 2014 10:55:08 -0400
Committer:  Arnaldo Carvalho de Melo <acme@...hat.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@...il.com>
Acked-by: Namhyung Kim <namhyung@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.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@...hat.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 */
--
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