aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorMichael S. Tsirkin <[email protected]>2016-01-28 19:02:44 +0200
committerIngo Molnar <[email protected]>2016-01-29 09:40:10 +0100
commit57d9b1b43433a6ba7267c80b87d8e8f6e86edceb (patch)
tree456da1f10a8d4973379c250acc165196216758e5
parente37cee133c72c9529f74a20d9b7eb3b6dfb928b5 (diff)
locking/x86: Tweak the comment about use of wmb() for IO
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 <[email protected]> Acked-by: Peter Zijlstra (Intel) <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Andrey Konovalov <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Brian Gerst <[email protected]> Cc: Davidlohr Bueso <[email protected]> Cc: Davidlohr Bueso <[email protected]> Cc: Denys Vlasenko <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: virtualization <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
-rw-r--r--arch/x86/include/asm/barrier.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/barrier.h b/arch/x86/include/asm/barrier.h
index a29174599a98..bfb28caf97b1 100644
--- a/arch/x86/include/asm/barrier.h
+++ b/arch/x86/include/asm/barrier.h
@@ -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.
*/