PERFORCE change 72454 for review

[John Baldwin]

http://perforce.freebsd.org/chv.cgi?CH=72454

Change 72454 by jhb at jhb_slimer on 2005/03/03 22:11:16

	Clobber all memory for atomic ops with an acquire barrier.
	
	Suggested by:	   alc

Affected files ...

.. //depot/projects/smpng/sys/sparc64/include/atomic.h#7 edit

Differences ...

==== //depot/projects/smpng/sys/sparc64/include/atomic.h#7 (text+ko) ====

@@ -90,6 +90,7 @@
 	itype(sz) v;							\
 	v = atomic_cas(p, e, s, sz);					\
 	membar(LoadLoad | LoadStore);					\
+	__asm __volatile("" : : : "memory");				\
 	v;								\
 })
 
@@ -115,6 +116,7 @@
 	itype(sz) t;							\
 	t = atomic_op(p, op, v, sz);					\
 	membar(LoadLoad | LoadStore);					\
+	__asm __volatile("" : : : "memory");				\
 	t;								\
 })
 
@@ -132,6 +134,7 @@
 	itype(sz) v;							\
 	v = atomic_load(p, sz);						\
 	membar(LoadLoad | LoadStore);					\
+	__asm __volatile("" : : : "memory");				\
 	v;								\
 })