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| author | Michael S. Tsirkin <mst@redhat.com> | 2016-01-28 19:02:44 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-01-29 09:40:10 +0100 |
| commit | 57d9b1b43433a6ba7267c80b87d8e8f6e86edceb (patch) | |
| tree | 456da1f10a8d4973379c250acc165196216758e5 /arch/x86/include/asm/barrier.h | |
| parent | e37cee133c72c9529f74a20d9b7eb3b6dfb928b5 (diff) | |
| download | linux-0-day-57d9b1b43433a6ba7267c80b87d8e8f6e86edceb.tar.gz linux-0-day-57d9b1b43433a6ba7267c80b87d8e8f6e86edceb.tar.xz | |
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 <mst@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Borislav Petkov <bp@suse.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: virtualization <virtualization@lists.linux-foundation.org>
Link: http://lkml.kernel.org/r/1453921746-16178-4-git-send-email-mst@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/barrier.h')
| -rw-r--r-- | arch/x86/include/asm/barrier.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/barrier.h b/arch/x86/include/asm/barrier.h index a29174599a983..bfb28caf97b1b 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. */ |