percpu_ref_tryget_live_rcu
if (!percpu_ref_tryget_live_rcu(&q->q_usage_counter))
if (unlikely(!percpu_ref_tryget_live_rcu(ref))) {
if (unlikely(!percpu_ref_tryget_live_rcu(ref))) {
ret = percpu_ref_tryget_live_rcu(ref);
if (pgmap && !percpu_ref_tryget_live_rcu(&pgmap->ref))