linux-kernel - [PATCH 4.2.y-ckt 173/206] metag: Fix atomic_*

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Message-Id: <1465507015-23052-174-git-send-email-kamal@canonical.com>
Date:	Thu,  9 Jun 2016 14:16:22 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	James Hogan <james.hogan@...tec.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-metag@...r.kernel.org, Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 173/206] metag: Fix atomic_*_return inline asm constraints

4.2.8-ckt12 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: James Hogan <james.hogan@...tec.com>

commit 096a8b6d5e7ab9f8ca3d2474b3ca6a1fe79e0371 upstream.

The argument i of atomic_*_return() operations is given to inline asm
with the "bd" constraint, which means "An Op2 register where Op1 is a
data unit register and the instruction supports O2R", however Op1 is
constrained by "da" which allows an address unit register to be used.

Fix the constraint to use "br", meaning "An Op2 register and the
instruction supports O2R", i.e. not requiring Op1 to be a data unit
register.

Fixes: d6dfe2509da9 ("locking,arch,metag: Fold atomic_ops")
Signed-off-by: James Hogan <james.hogan@...tec.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: linux-metag@...r.kernel.org
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/metag/include/asm/atomic_lnkget.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/metag/include/asm/atomic_lnkget.h b/arch/metag/include/asm/atomic_lnkget.h
index 948d868..d0bdc28 100644
--- a/arch/metag/include/asm/atomic_lnkget.h
+++ b/arch/metag/include/asm/atomic_lnkget.h
@@ -61,7 +61,7 @@ static inline int atomic_##op##_return(int i, atomic_t *v)		\
 		"	CMPT	%0, #HI(0x02000000)\n"			\
 		"	BNZ 1b\n"					\
 		: "=&d" (temp), "=&da" (result)				\
-		: "da" (&v->counter), "bd" (i)				\
+		: "da" (&v->counter), "br" (i)				\
 		: "cc");						\
 									\
 	smp_mb();							\
-- 
2.7.4