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| author |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-11-27 09:45:10 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-12-05 11:57:55 -0800 |
| commit | 3a5db0b108e0a40f08c2bcff6a675dbf632b91e0 (patch) | |
| tree | 82d42ae442641f772842dad75fffbbe6b7673b5f /drivers/vhost | |
| parent | checkpatch: Add warnings for {smp_,}read_barrier_depends() (diff) | |
| download | linux-dev-3a5db0b108e0a40f08c2bcff6a675dbf632b91e0.tar.xz linux-dev-3a5db0b108e0a40f08c2bcff6a675dbf632b91e0.zip | |
drivers/vhost: Remove now-redundant read_barrier_depends()
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>
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/vhost.c | 7 |
1 files changed, 1 insertions, 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; } |