mn10300: add cc clobbers to asm statements

gcc 4.2.1 for MN10300 is more agressive than the older gcc in
reordering/moving other insns between an insn that sets flags and an insn
that uses those flags.  This leads to trouble with asm statements which
are missing an explicit "cc" clobber.  This patch adds the explicit "cc"
clobber to asm statements which do indeed clobber the condition flags.

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/mn10300/kernel/mn10300-serial.c b/arch/mn10300/kernel/mn10300-serial.c
index 229b710fc5d5..ef34d5a0f8bd 100644
--- a/arch/mn10300/kernel/mn10300-serial.c
+++ b/arch/mn10300/kernel/mn10300-serial.c
@@ -380,7 +380,8 @@ static int mask_test_and_clear(volatile u8 *ptr, u8 mask)
         u32 epsw;
         asm volatile("  bclr    %1,(%2)         \n"
                      "  mov     epsw,%0         \n"
-                     : "=d"(epsw) : "d"(mask), "a"(ptr));
+                     : "=d"(epsw) : "d"(mask), "a"(ptr)
+                     : "cc", "memory");
         return !(epsw & EPSW_FLAG_Z);
 }