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...rkin <mst at redhat.com> > --- > include/linux/virtio_ring.h | 12 ++++++++++++ > drivers/virtio/virtio_ring.c | 15 +++++++++------ > 2 files changed, 21 insertions(+), 6 deletions(-) > > diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h > index f3fa55b..3a74d91 100644 > --- a/include/linux/virtio_ring.h > +++ b/include/linux/virtio_ring.h > @@ -45,6 +45,18 @@ static inline void virtio_wmb(bool weak_barriers) > wmb(); > } > > +static inline void virtio_store_mb(bool weak_barriers, > + __virtio16 *p, __virtio16 v...

...rkin <mst at redhat.com> > --- > include/linux/virtio_ring.h | 12 ++++++++++++ > drivers/virtio/virtio_ring.c | 15 +++++++++------ > 2 files changed, 21 insertions(+), 6 deletions(-) > > diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h > index f3fa55b..3a74d91 100644 > --- a/include/linux/virtio_ring.h > +++ b/include/linux/virtio_ring.h > @@ -45,6 +45,18 @@ static inline void virtio_wmb(bool weak_barriers) > wmb(); > } > > +static inline void virtio_store_mb(bool weak_barriers, > + __virtio16 *p, __virtio16 v...

...k <alexander.duyck at gmail.com> Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- include/linux/virtio_ring.h | 25 ++++--------------------- 1 file changed, 4 insertions(+), 21 deletions(-) diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h index 67e06fe..f3fa55b 100644 --- a/include/linux/virtio_ring.h +++ b/include/linux/virtio_ring.h @@ -12,7 +12,7 @@ * anyone care? * * For virtio_pci on SMP, we don't need to order with respect to MMIO - * accesses through relaxed memory I/O windows, so smp_mb() et al are + * accesses through relaxed memory I/O...

...nters. Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- include/linux/virtio_ring.h | 12 ++++++++++++ drivers/virtio/virtio_ring.c | 15 +++++++++------ 2 files changed, 21 insertions(+), 6 deletions(-) diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h index f3fa55b..3a74d91 100644 --- a/include/linux/virtio_ring.h +++ b/include/linux/virtio_ring.h @@ -45,6 +45,18 @@ static inline void virtio_wmb(bool weak_barriers) wmb(); } +static inline void virtio_store_mb(bool weak_barriers, + __virtio16 *p, __virtio16 v) +{ + if (weak_barriers) + virt_store_...

Changes since v1: - replaced my asm-generic patch with an equivalent patch already in tip - add wrappers with virt_ prefix for better code annotation, as suggested by David Miller - dropped XXX in patch names as this makes vger choke, Cc all relevant mailing lists on all patches (not personal email, as the list becomes too long then) I parked this in vhost tree for now, but the

Changes since v1: - replaced my asm-generic patch with an equivalent patch already in tip - add wrappers with virt_ prefix for better code annotation, as suggested by David Miller - dropped XXX in patch names as this makes vger choke, Cc all relevant mailing lists on all patches (not personal email, as the list becomes too long then) I parked this in vhost tree for now, but the

Changes since v2: - extended checkpatch tests for barriers, and added patches teaching it to warn about incorrect usage of barriers (__smp_xxx barriers are for use by asm-generic code only), should help prevent misuse by arch code to address comments by Russell King - patched more instances of xen to use virt_ barriers as suggested by Stefano Stabellini - implemented a 2 byte xchg on sh

Changes since v2: - extended checkpatch tests for barriers, and added patches teaching it to warn about incorrect usage of barriers (__smp_xxx barriers are for use by asm-generic code only), should help prevent misuse by arch code to address comments by Russell King - patched more instances of xen to use virt_ barriers as suggested by Stefano Stabellini - implemented a 2 byte xchg on sh