s390/cmpxchg: fix 1 and 2 byte memory accesses

When accessing a 1 or 2 byte memory operand we cannot use the
passed address since the compare and swap instruction only works
for 4 byte aligned memory operands.
Hence we calculate an aligned address so that compare and swap works
correctly. However we don't pass the calculated address to the inline
assembly. This results in incorrect memory accesses and in a
specification exception if used on non 4 byte aligned memory operands.

Since this didn't happen until now, there don't seem to be
too many users of cmpxchg on unaligned addresses.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/arch/s390/include/asm/cmpxchg.h b/arch/s390/include/asm/cmpxchg.h
index 13c8b2eb6983..26f2cb1aa9ff 100644
--- a/arch/s390/include/asm/cmpxchg.h
+++ b/arch/s390/include/asm/cmpxchg.h
@@ -113,9 +113,9 @@ static inline unsigned long __cmpxchg(void *ptr, unsigned long old,
                         "       nr      %1,%5\n"
                         "       jnz     0b\n"
                         "1:"
-                        : "=&d" (prev), "=&d" (tmp), "=Q" (*(int *) ptr)
+                        : "=&d" (prev), "=&d" (tmp), "+Q" (*(int *) addr)
                         : "d" (old << shift), "d" (new << shift),
-                          "d" (~(255 << shift)), "Q" (*(int *) ptr)
+                          "d" (~(255 << shift))
                         : "memory", "cc");
                 return prev >> shift;
         case 2:
@@ -134,9 +134,9 @@ static inline unsigned long __cmpxchg(void *ptr, unsigned long old,
                         "       nr      %1,%5\n"
                         "       jnz     0b\n"
                         "1:"
-                        : "=&d" (prev), "=&d" (tmp), "=Q" (*(int *) ptr)
+                        : "=&d" (prev), "=&d" (tmp), "+Q" (*(int *) addr)
                         : "d" (old << shift), "d" (new << shift),
-                          "d" (~(65535 << shift)), "Q" (*(int *) ptr)
+                          "d" (~(65535 << shift))
                         : "memory", "cc");
                 return prev >> shift;
         case 4: