| commit | dfa408369ca6b7b1718558ba44e558dfc9053414 | |
| author | Imre Vadász <imre@vdsz.com> | |
| Mon, 13 Feb 2017 19:16:14 +0000 (13 20:16 +0100) | ||
| committer | Imre Vadász <imre@vdsz.com> | |
| Sun, 2 Apr 2017 08:00:56 +0000 (2 10:00 +0200) | ||
| tree | 786efc66c9cc8fefff7c492b6f0fece2263c48fe | treesnapshot (tar.gz zip) |
| parent | 06ea426b3a71e8afc709c878c76a01d4b342b1f8 | commitdiff |
virtio: Replace one cpu_mfence() by cpu_lfence(), and one by cpu_sfence().
* The cpu_mfence() in virtqueue_dequeue() can be replaced by cpu_lfence(),
since we only need to make sure that we read the vq->vq_ring.used->idx
value before reading any other entries from the vq->vq_ring.used ring.
* The cpu_mfence() in vq_ring_update_avail() can be replaced by
cpu_sfence(), since no one else is writing to the vq->vq_ring.avail
struct.
* The cpu_mfence() in virtqueue_dequeue() can be replaced by cpu_lfence(),
since we only need to make sure that we read the vq->vq_ring.used->idx
value before reading any other entries from the vq->vq_ring.used ring.
* The cpu_mfence() in vq_ring_update_avail() can be replaced by
cpu_sfence(), since no one else is writing to the vq->vq_ring.avail
struct.
| sys/dev/virtual/virtio/virtio/virtqueue.c | diffblobblamehistory |