Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 21/21] drivers/vhost: Remove now-redundant read_barrier_depends() | Date | Fri, 1 Dec 2017 11:51:16 -0800 |
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Because READ_ONCE() now implies read_barrier_depends(), the read_barrier_depends() in next_desc() is now redundant. This commit therefore removes it and the related comments.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Cc: <kvm@vger.kernel.org> Cc: <virtualization@lists.linux-foundation.org> Cc: <netdev@vger.kernel.org> --- drivers/vhost/vhost.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 33ac2b186b85..78b5940a415a 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1877,12 +1877,7 @@ static unsigned next_desc(struct vhost_virtqueue *vq, struct vring_desc *desc) return -1U; /* Check they're not leading us off end of descriptors. */ - next = vhost16_to_cpu(vq, desc->next); - /* Make sure compiler knows to grab that: we don't want it changing! */ - /* We will use the result as an index in an array, so most - * architectures only need a compiler barrier here. */ - read_barrier_depends(); - + next = vhost16_to_cpu(vq, READ_ONCE(desc->next)); return next; } -- 2.5.2
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