PERFORCE change 63384 for review

[John Baldwin]

http://perforce.freebsd.org/chv.cgi?CH=63384

Change 63384 by jhb at jhb_tibook on 2004/10/19 20:29:11

	Use fences here as well.

Affected files ...

.. //depot/projects/smpng/sys/amd64/include/bus_amd64.h#4 edit

Differences ...

==== //depot/projects/smpng/sys/amd64/include/bus_amd64.h#4 (text+ko) ====

@@ -1215,9 +1215,9 @@
 {
 #ifdef	__GNUC__
 	if (flags & BUS_SPACE_BARRIER_READ)
-		__asm __volatile("lock; addl $0,0(%%rsp)" : : : "memory");
+		__asm __volatile("lfence" : : : "memory");
 	else
-		__asm __volatile("" : : : "memory");
+		__asm __volatile("sfence" : : : "memory");
 #endif
 }