i386: Use patchable lock prefix in set_64bit

Previously lock was unconditionally used, but shouldn't be needed on
UP systems.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/asm-i386/cmpxchg.h b/include/asm-i386/cmpxchg.h
index 64dcdf46117bf2c1dbaeba8e88fa36912fab67c2..f86ede28f6dc84750ab60250cc7d122534d9c74a 100644 (file)
--- a/include/asm-i386/cmpxchg.h
+++ b/include/asm-i386/cmpxchg.h
@@ -34,7 +34,7 @@ static inline void __set_64bit (unsigned long long * ptr,
                "\n1:\t"
                "movl (%0), %%eax\n\t"
                "movl 4(%0), %%edx\n\t"
-               "lock cmpxchg8b (%0)\n\t"
+               LOCK_PREFIX "cmpxchg8b (%0)\n\t"
                "jnz 1b"
                : /* no outputs */
                :       "D"(ptr),