- vhost_user_log_dirty_pages(vui, vq->log_guest_addr + offsetof(vring_used_t, member), \
- sizeof(vq->used->member))
+ if (PREDICT_FALSE(vq->log_used)) { \
+ vhost_user_log_dirty_pages(vui, vq->log_guest_addr + offsetof(vring_used_t, member), \
+ sizeof(vq->used->member)); \
+ }