linux-kernel - [PATCH 3.13 24/46] perf tools: Fix AAAAARGH64 memory barriers

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Date:	Fri, 28 Mar 2014 10:32:08 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Will Deacon <will.deacon@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 3.13 24/46] perf tools: Fix AAAAARGH64 memory barriers

3.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Peter Zijlstra <peterz@...radead.org>

commit f428ebd184c82a7914b2aa7e9f868918aaf7ea78 upstream.

Someone got the load and store barriers mixed up for AAAAARGH64.  Turn
them the right side up.

Reported-by: Will Deacon <will.deacon@....com>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Fixes: a94d342b9cb0 ("tools/perf: Add required memory barriers")
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Will Deacon <will.deacon@....com>
Link: http://lkml.kernel.org/r/20140124154002.GF31570@twins.programming.kicks-ass.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 tools/perf/perf.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -100,8 +100,8 @@
 
 #ifdef __aarch64__
 #define mb()		asm volatile("dmb ish" ::: "memory")
-#define wmb()		asm volatile("dmb ishld" ::: "memory")
-#define rmb()		asm volatile("dmb ishst" ::: "memory")
+#define wmb()		asm volatile("dmb ishst" ::: "memory")
+#define rmb()		asm volatile("dmb ishld" ::: "memory")
 #define cpu_relax()	asm volatile("yield" ::: "memory")
 #endif
 


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