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authorMichael S. Tsirkin <mst@redhat.com>2011-07-19 17:15:43 +0300
committerMichael S. Tsirkin <mst@redhat.com>2011-07-19 17:17:28 +0300
commitb834226b04d6fb51178a64e98872856986c71474 (patch)
tree61bc6a86691586b490210029aeb603969d97e399 /drivers/vhost
parent75fd9edc1054a1fa1d1411adec368dadf68e764e (diff)
downloadlinux-linaro-stable-b834226b04d6fb51178a64e98872856986c71474.tar.gz
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.c4
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;