Inform a compiler which asm statements in the x86 implementation of

atomics change eflags.

Reviewed by:	jhb
MFC after:	2 weeks

1 files changed, 10 insertions, 9 deletions

diff --git a/sys/amd64/include/atomic.h b/sys/amd64/include/atomic.h
index bcf61f9f4155..e167b54f979e 100644
--- a/sys/amd64/include/atomic.h
+++ b/sys/amd64/include/atomic.h
@@ -108,7 +108,8 @@ atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\
 {							\
 	__asm __volatile(MPLOCKED OP			\
 	: "=m" (*p)					\
-	: CONS (V), "m" (*p));				\
+	: CONS (V), "m" (*p)				\
+	: "cc");					\
 }							\
 							\
 static __inline void					\
@@ -117,7 +118,7 @@ atomic_##NAME##_barr_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\
 	__asm __volatile(MPLOCKED OP			\
 	: "=m" (*p)					\
 	: CONS (V), "m" (*p)				\
-	: "memory");					\
+	: "memory", "cc");				\
 }							\
 struct __hack
 
@@ -145,7 +146,7 @@ atomic_cmpset_int(volatile u_int *dst, u_int expect, u_int src)
 	: "r" (src),			/* 2 */
 	  "a" (expect),			/* 3 */
 	  "m" (*dst)			/* 4 */
-	: "memory");
+	: "memory", "cc");
 
 	return (res);
 }
@@ -166,7 +167,7 @@ atomic_cmpset_long(volatile u_long *dst, u_long expect, u_long src)
 	: "r" (src),			/* 2 */
 	  "a" (expect),			/* 3 */
 	  "m" (*dst)			/* 4 */
-	: "memory");
+	: "memory", "cc");
 
 	return (res);
 }
@@ -185,8 +186,8 @@ atomic_fetchadd_int(volatile u_int *p, u_int v)
 	"# atomic_fetchadd_int"
 	: "+r" (v),			/* 0 (result) */
 	  "=m" (*p)			/* 1 */
-	: "m" (*p));			/* 2 */
-
+	: "m" (*p)			/* 2 */
+	: "cc");
 	return (v);
 }
 
@@ -204,8 +205,8 @@ atomic_fetchadd_long(volatile u_long *p, u_long v)
 	"# atomic_fetchadd_long"
 	: "+r" (v),			/* 0 (result) */
 	  "=m" (*p)			/* 1 */
-	: "m" (*p));			/* 2 */
-
+	: "m" (*p)			/* 2 */
+	: "cc");
 	return (v);
 }
 
@@ -249,7 +250,7 @@ atomic_load_acq_##TYPE(volatile u_##TYPE *p)		\
 	: "=a" (res),			/* 0 */		\
 	  "=m" (*p)			/* 1 */		\
 	: "m" (*p)			/* 2 */		\
-	: "memory");					\
+	: "memory", "cc");				\
 							\
 	return (res);					\
 }							\