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| author | Michael S. Tsirkin <mst@redhat.com> | 2016-01-28 19:02:37 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-01-29 09:40:10 +0100 |
| commit | e37cee133c72c9529f74a20d9b7eb3b6dfb928b5 (patch) | |
| tree | ed19bb96ae62fdd3efce33ca2551249e0c1392dd /arch/x86/include/asm/barrier.h | |
| parent | bd922477d9350a3006d73dabb241400e6c4181b0 (diff) | |
| download | linux-0-day-e37cee133c72c9529f74a20d9b7eb3b6dfb928b5.tar.gz linux-0-day-e37cee133c72c9529f74a20d9b7eb3b6dfb928b5.tar.xz | |
locking/x86: Drop a comment left over from X86_OOSTORE
The comment about wmb being non-NOP to deal with non-Intel CPUs
is a left over from before the following commit:
09df7c4c8097 ("x86: Remove CONFIG_X86_OOSTORE")
It makes no sense now: in particular, wmb() is not a NOP even for
regular Intel CPUs because of weird use-cases e.g. dealing with
WC memory.
Drop this comment.
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/1453921746-16178-3-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 | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/x86/include/asm/barrier.h b/arch/x86/include/asm/barrier.h index a65bdb10246a3..a29174599a983 100644 --- a/arch/x86/include/asm/barrier.h +++ b/arch/x86/include/asm/barrier.h @@ -11,10 +11,6 @@ */ #ifdef CONFIG_X86_32 -/* - * Some non-Intel clones support out of order store. wmb() ceases to be a - * nop for these. - */ #define mb() asm volatile(ALTERNATIVE("lock; addl $0,0(%%esp)", "mfence", \ X86_FEATURE_XMM2) ::: "memory", "cc") #define rmb() asm volatile(ALTERNATIVE("lock; addl $0,0(%%esp)", "lfence", \ |