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| author | Michael S. Tsirkin <mst@redhat.com> | 2011-07-19 17:15:43 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2011-07-19 17:17:28 +0300 |
| commit | b834226b04d6fb51178a64e98872856986c71474 (patch) | |
| tree | 61bc6a86691586b490210029aeb603969d97e399 /drivers/vhost | |
| parent | 75fd9edc1054a1fa1d1411adec368dadf68e764e (diff) | |
| download | blackbird-obmc-linux-b834226b04d6fb51178a64e98872856986c71474.tar.gz blackbird-obmc-linux-b834226b04d6fb51178a64e98872856986c71474.zip | |
vhost: optimize interrupt enable/disable
As we now only update used ring after enabling
the backend, we can write flags with __put_user:
as that's done on data path, it matters.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/vhost.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index c16d22545868..c14c42b95ab8 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -998,7 +998,7 @@ int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log, static int vhost_update_used_flags(struct vhost_virtqueue *vq) { void __user *used; - if (put_user(vq->used_flags, &vq->used->flags) < 0) + if (__put_user(vq->used_flags, &vq->used->flags) < 0) return -EFAULT; if (unlikely(vq->log_used)) { /* Make sure the flag is seen before log. */ @@ -1016,7 +1016,7 @@ static int vhost_update_used_flags(struct vhost_virtqueue *vq) static int vhost_update_avail_event(struct vhost_virtqueue *vq, u16 avail_event) { - if (put_user(vq->avail_idx, vhost_avail_event(vq))) + if (__put_user(vq->avail_idx, vhost_avail_event(vq))) return -EFAULT; if (unlikely(vq->log_used)) { void __user *used; |
