[PATCH v5 3/5] x86: tweak the comment about use of wmb for IO
From: Michael S. Tsirkin
Date: Thu Jan 28 2016 - 12:03:00 EST
On x86, we *do* still use the non-nop rmb/wmb for IO barriers, but even
that is generally questionable.
Leave them around as historial unless somebody can point to a case where
they care about the performance, but tweak the comment so people
don't think they are strictly required in all cases.
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
arch/x86/include/asm/barrier.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/barrier.h b/arch/x86/include/asm/barrier.h
index a291745..bfb28ca 100644
@@ -6,7 +6,7 @@
* Force strict CPU ordering.
- * And yes, this is required on UP too when we're talking
+ * And yes, this might be required on UP too when we're talking
* to devices.