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authorJames Hogan <james.hogan@imgtec.com>2016-08-04 19:36:08 +0300
committerJames Hogan <james.hogan@imgtec.com>2016-08-04 19:59:09 +0300
commit6154c187b97ee7513046bb4eb317a89f738f13ef (patch)
treec45e9c0df9f6c647182bfbbd26a259db36f595f0 /arch
parentfb2bb461e2d8c3af659c8a501d642a735b3ddadc (diff)
downloadlinux-6154c187b97ee7513046bb4eb317a89f738f13ef.tar.xz
metag: Fix __cmpxchg_u32 asm constraint for CMP
The LNKGET based atomic sequence in __cmpxchg_u32 has slightly incorrect constraints for the return value which under certain circumstances can allow an address unit register to be used as the first operand of a CMP instruction. This isn't a valid instruction however as the encodings only allow a data unit to be specified. This would result in an assembler error like the following: Error: failed to assemble instruction: "CMP A0.2,D0Ar6" Fix by changing the constraint from "=&da" (assigned, early clobbered, data or address unit register) to "=&d" (data unit register only). The constraint for the second operand, "bd" (an op2 register where op1 is a data unit register and the instruction supports O2R) is already correct assuming the first operand is a data unit register. Other cases of CMP in inline asm have had their constraints checked, and appear to all be fine. Fixes: 6006c0d8ce94 ("metag: Atomics, locks and bitops") Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: linux-metag@vger.kernel.org Cc: <stable@vger.kernel.org> # 3.9.x-
Diffstat (limited to 'arch')
-rw-r--r--arch/metag/include/asm/cmpxchg_lnkget.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/metag/include/asm/cmpxchg_lnkget.h b/arch/metag/include/asm/cmpxchg_lnkget.h
index 0154e2807ebb..2369ad394876 100644
--- a/arch/metag/include/asm/cmpxchg_lnkget.h
+++ b/arch/metag/include/asm/cmpxchg_lnkget.h
@@ -73,7 +73,7 @@ static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
" DCACHE [%2], %0\n"
#endif
"2:\n"
- : "=&d" (temp), "=&da" (retval)
+ : "=&d" (temp), "=&d" (retval)
: "da" (m), "bd" (old), "da" (new)
: "cc"
);