commit f983547ed65a90c73b3e5eeee707041cc04acb0e
Author: Michael S. Tsirkin <mst@redhat.com>
Date:   Tue Sep 21 14:18:01 2010 +0200

    vhost: copy_to_user -> __copy_to_user
    
    We do access_ok checks at setup time, so we don't need to
    redo them on each access.
    
    Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 54ba561..5109bc0 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1245,7 +1245,7 @@ static int __vhost_add_used_n(struct vhost_virtqueue *vq,
 
 	start = vq->last_used_idx % vq->num;
 	used = vq->used->ring + start;
-	if (copy_to_user(used, heads, count * sizeof *used)) {
+	if (__copy_to_user(used, heads, count * sizeof *used)) {
 		vq_err(vq, "Failed to write used");
 		return -EFAULT;
 	}