sh: fixed cmpxchg gRB version

This patch fixes a bug within the cmpxchg GRB version.

A problem was notices while running some tests to stress
the priority inheritance, for example pi_stress
(http://rt.wiki.kernel.org/index.php/PI_Mutex_Test).

Also, without this patch, after applying the latest work to
consolidate atomic_cmpxchg() definitions (commit:
8c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0)
the Kernel doesn't boot at all.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/arch/sh/include/asm/cmpxchg-grb.h b/arch/sh/include/asm/cmpxchg-grb.h
index e2681abe764f..4676bf57693a 100644
--- a/arch/sh/include/asm/cmpxchg-grb.h
+++ b/arch/sh/include/asm/cmpxchg-grb.h
@@ -57,11 +57,10 @@ static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
                 "   mov.l  @%1,   %0      \n\t" /* load  old value */
                 "   cmp/eq  %0,   %2      \n\t"
                 "   bf            1f      \n\t" /* if not equal */
-                "   mov.l   %2,   @%1     \n\t" /* store new value */
+                "   mov.l   %3,   @%1     \n\t" /* store new value */
                 "1: mov     r1,   r15     \n\t" /* LOGOUT */
-                : "=&r" (retval),
-                  "+r"  (m)
-                : "r"   (new)
+                : "=&r" (retval)
+                :  "r"  (m), "r"  (old), "r"  (new)
                 : "memory" , "r0", "r1", "t");
 
         return retval;