• Michael S. Tsirkin's avatar
    locking/x86: Tweak the comment about use of wmb() for IO · 57d9b1b4
    Michael S. Tsirkin authored
    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: default avatarMichael S. Tsirkin <mst@redhat.com>
    Acked-by: default avatarPeter 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.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    57d9b1b4
barrier.h 2.09 KB