Patch "metag: Fix atomic_*_return inline asm constraints" has been added to the 4.4-stable tree

Patch "metag: Fix atomic_*_return inline asm constraints" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    metag: Fix atomic_*_return inline asm constraints

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     metag-fix-atomic_-_return-inline-asm-constraints.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 096a8b6d5e7ab9f8ca3d2474b3ca6a1fe79e0371 Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@imgtec.com>
Date: Tue, 3 May 2016 09:11:21 +0100
Subject: metag: Fix atomic_*_return inline asm constraints

From: James Hogan <james.hogan@imgtec.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@imgtec.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-metag@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/metag/include/asm/atomic_lnkget.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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(i
 		"	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();							\


Patches currently in stable-queue which might be from james.hogan@imgtec.com are

queue-4.4/metag-fix-atomic_-_return-inline-asm-constraints.patch