Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1530480

Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE()

From Mark Rutland <mark.rutland@arm.com>
Newsgroups linux.kernel
Subject Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE()
Date 2016-11-25 19:10 +0100
Message-ID <sHt6G-3WZ-29@gated-at.bofh.it> (permalink)
References (5 earlier) <sHqBQ-2hw-29@gated-at.bofh.it> <sHroe-2Rp-5@gated-at.bofh.it> <sHroe-2Rp-7@gated-at.bofh.it> <sHstY-3tw-27@gated-at.bofh.it> <sHsX0-3Dv-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

On Fri, Nov 25, 2016 at 09:52:50AM -0800, Linus Torvalds wrote:
> READ/WRITE_ONCE() are atomic *WHEN*THAT*IS*POSSIBLE*.

> But sometimes it's not going to be atomic.

That's the problem.

Common code may rely on something being atomic when that's only true on
a subset of platforms. On others, it's silently "fixed" into something
that isn't atomic, and we get no diagnostic. The bug lurks beneath the
surface.

Thanks,
Mark.

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Mark Rutland <mark.rutland@arm.com> - 2016-11-24 11:30 +0100
  [PATCH 2/3] vringh: kill off ACCESS_ONCE() Mark Rutland <mark.rutland@arm.com> - 2016-11-24 11:30 +0100
    Re: [PATCH 2/3] vringh: kill off ACCESS_ONCE() Christian Borntraeger <borntraeger@de.ibm.com> - 2016-11-24 12:20 +0100
    Re: [PATCH 2/3] vringh: kill off ACCESS_ONCE() Cornelia Huck <cornelia.huck@de.ibm.com> - 2016-11-24 12:40 +0100
    Re: [PATCH 2/3] vringh: kill off ACCESS_ONCE() Jason Wang <jasowang@redhat.com> - 2016-11-25 03:50 +0100
  [PATCH 1/3] tools/virtio: fix READ_ONCE() Mark Rutland <mark.rutland@arm.com> - 2016-11-24 11:30 +0100
    Re: [PATCH 1/3] tools/virtio: fix READ_ONCE() Cornelia Huck <cornelia.huck@de.ibm.com> - 2016-11-24 12:40 +0100
    Re: [PATCH 1/3] tools/virtio: fix READ_ONCE() Jason Wang <jasowang@redhat.com> - 2016-11-25 03:40 +0100
  [PATCH 3/3] tools/virtio: use {READ,WRITE}_ONCE() in uaccess.h Mark Rutland <mark.rutland@arm.com> - 2016-11-24 11:30 +0100
    Re: [PATCH 3/3] tools/virtio: use {READ,WRITE}_ONCE() in uaccess.h Cornelia Huck <cornelia.huck@de.ibm.com> - 2016-11-24 12:40 +0100
    Re: [PATCH 3/3] tools/virtio: use {READ,WRITE}_ONCE() in uaccess.h Jason Wang <jasowang@redhat.com> - 2016-11-25 03:50 +0100
  Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() "Michael S. Tsirkin" <mst@redhat.com> - 2016-11-24 21:40 +0100
    Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Mark Rutland <mark.rutland@arm.com> - 2016-11-25 12:30 +0100
      Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Christian Borntraeger <borntraeger@de.ibm.com> - 2016-11-25 12:40 +0100
        Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Mark Rutland <mark.rutland@arm.com> - 2016-11-25 13:30 +0100
          Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Peter Zijlstra <peterz@infradead.org> - 2016-11-25 13:50 +0100
            Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Peter Zijlstra <peterz@infradead.org> - 2016-11-25 13:50 +0100
              Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Boqun Feng <boqun.feng@gmail.com> - 2016-11-25 16:00 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Dmitry Vyukov <dvyukov@google.com> - 2016-11-25 16:30 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Mark Rutland <mark.rutland@arm.com> - 2016-11-25 17:20 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Peter Zijlstra <peterz@infradead.org> - 2016-11-25 17:20 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Mark Rutland <mark.rutland@arm.com> - 2016-11-25 17:40 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Christian Borntraeger <borntraeger@de.ibm.com> - 2016-11-25 18:00 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Mark Rutland <mark.rutland@arm.com> - 2016-11-25 18:30 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Peter Zijlstra <peterz@infradead.org> - 2016-11-25 18:50 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Christian Borntraeger <borntraeger@de.ibm.com> - 2016-11-25 19:50 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() "Michael S. Tsirkin" <mst@redhat.com> - 2016-11-25 22:10 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Christian Borntraeger <borntraeger@de.ibm.com> - 2016-11-25 22:50 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Dmitry Vyukov <dvyukov@google.com> - 2016-11-25 18:30 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Mark Rutland <mark.rutland@arm.com> - 2016-11-25 18:50 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-25 19:00 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Mark Rutland <mark.rutland@arm.com> - 2016-11-25 19:10 +0100
                Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-25 19:50 +0100
            Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE() Mark Rutland <mark.rutland@arm.com> - 2016-11-25 15:40 +0100

csiph-web