vhost_add_used_n
return vhost_add_used_n(vq, &heads, &nheads, 1);
EXPORT_SYMBOL_GPL(vhost_add_used_n);
vhost_add_used_n(vq, heads, nheads, count);
int vhost_add_used_n(struct vhost_virtqueue *, struct vring_used_elem *heads,