--- src/backend/storage/lmgr/s_lock.c
+++ src/backend/storage/lmgr/s_lock.c
@@ -144,31 +144,6 @@
 }
 #endif   /* __APPLE__ && __ppc__ */
 
-#if defined(__powerpc__)
-/* Note: need a nice gcc constrained asm version so it can be inlined */
-static void
-tas_dummy()
-{
-	__asm__		__volatile__(
-										 "\
-.global tas 					\n\
-tas:							\n\
-			lwarx	5,0,3		\n\
-			cmpwi 	5,0 		\n\
-			bne 	fail		\n\
-			addi 	5,5,1		\n\
-			stwcx.	5,0,3		\n\
-			beq 	success 	\n\
-fail:		li		3,1 		\n\
-			blr 				\n\
-success:						\n\
-			isync				\n\
-			li 		3,0			\n\
-			blr					\n\
-");
-}
-#endif   /* __powerpc__ */
-
 #if defined(__mips__) && !defined(__sgi)
 static void
 tas_dummy()
--- src/include/port/linux.h
+++ src/include/port/linux.h
@@ -8,6 +8,11 @@
 
 #define HAS_TEST_AND_SET
 
+#elif defined(__powerpc64__)
+typedef unsigned long slock_t;
+
+#define HAS_TEST_AND_SET
+
 #elif defined(__powerpc__)
 typedef unsigned int slock_t;
 
--- src/include/storage/s_lock.h
+++ src/include/storage/s_lock.h
@@ -192,6 +192,35 @@
 
 #endif	 /* __sparc__ */
 
+#if defined(__powerpc__) || defined(__powerpc64__)
+static __inline__ int
+tas(volatile slock_t *lock)
+{
+	slock_t _t;
+	int _res;
+
+	__asm__ __volatile__(
+"	lwarx   %0,0,%3		\n"
+"	cmpwi   %0,0		\n"
+"	bne     1f		\n"
+"	addi    %0,%0,1		\n"
+"	stwcx.  %0,0,%3		\n"
+"	isync			\n"
+"	beq     2f         	\n"
+"1:	li      %2,1		\n"
+"	b	3f		\n"
+"2:				\n"
+"	li      %2,0		\n"
+"3:				\n"
+
+:	"=&r" (_t), "=m" (lock), "=r" (_res)
+:	"r" (lock)
+:	"cc", "memory"
+	);
+	return _res;
+}
+#endif
+
 
 #if defined(__mc68000__) && defined(__linux__)
 #define TAS(lock) tas(lock)