linux-kernel - [PATCH 3.10 25/51] ARM: 7867/1: include: asm: use int instead of unsigned long for oldval in atomic

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Date:	Tue,  3 Feb 2015 15:17:07 -0800
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>,
	Chen Gang <gang.chen@...anux.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Hou Pengyang <houpengyang@...wei.com>
Subject: [PATCH 3.10 25/51] ARM: 7867/1: include: asm: use int instead of unsigned long for oldval in atomic_cmpxchg().

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

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

From: Chen Gang <gang.chen@...anux.com>

commit 4dcc1cf7316a26e112f5c9fcca531ff98ef44700 upstream.

For atomic_cmpxchg(), the type of 'oldval' need be 'int' to match the
type of "*ptr" (used by 'ldrex' instruction) and 'old' (used by 'teq'
instruction).

Reviewed-by: Will Deacon <will.deacon@....com>
Signed-off-by: Chen Gang <gang.chen@...anux.com>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Cc: Hou Pengyang <houpengyang@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/include/asm/atomic.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/arm/include/asm/atomic.h
+++ b/arch/arm/include/asm/atomic.h
@@ -114,7 +114,8 @@ static inline int atomic_sub_return(int
 
 static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new)
 {
-	unsigned long oldval, res;
+	int oldval;
+	unsigned long res;
 
 	smp_mb();
 


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