x86: Use correct byte-sized register constraint in __add()

Similar to:

 2ca052a x86: Use correct byte-sized register constraint in __xchg_op()

... the __add() macro also needs to use a "q" constraint in the
byte-sized case, lest we try to generate an illegal register.

Link: http://lkml.kernel.org/r/4F7A3315.501@goop.org
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Leigh Scott <leigh123linux@googlemail.com>
Cc: Thomas Reitmayr <treitmayr@devbase.at>
Cc: <stable@vger.kernel.org> v3.3

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86/include/asm/cmpxchg.h b/arch/x86/include/asm/cmpxchg.h
index bc18d0ed459a..99480e55973d 100644
--- a/arch/x86/include/asm/cmpxchg.h
+++ b/arch/x86/include/asm/cmpxchg.h
@@ -173,7 +173,7 @@ extern void __add_wrong_size(void)
                 switch (sizeof(*(ptr))) {                               \
                 case __X86_CASE_B:                                      \
                         asm volatile (lock "addb %b1, %0\n"             \
-                                      : "+m" (*(ptr)) : "ri" (inc)      \
+                                      : "+m" (*(ptr)) : "qi" (inc)      \
                                       : "memory", "cc");                \
                         break;                                          \
                 case __X86_CASE_W:                                      \