--- mysql-5.0.27/bdb/dbinc/mutex.h.orig	2006-10-20 20:22:26.000000000 -0400
+++ mysql-5.0.27/bdb/dbinc/mutex.h	2007-04-24 17:06:36.000000000 -0400
@@ -401,10 +401,11 @@
  */
 #define	MUTEX_SET(tsl) ({						\
 	int __r;							\
-	asm volatile("swpb %0, %1, [%2]"				\
-	    : "=r" (__r) 						\
-	    : "0" (1), "r" (tsl)					\
-	    : "memory"							\
+	asm volatile(							\
+		"swpb	%0, %1, [%2]\n\t"				\
+		"eor	%0, %0, #1\n\t"					\
+	    : "=&r" (__r)						\
+	    : "r" (1), "r" (tsl)					\
 	    );								\
 	__r & 1;							\
 })