bfq_put_stable_ref
bfq_put_stable_ref(stable_merge_bfqq);
static void bfq_put_stable_ref(struct bfq_queue *bfqq);
bfq_put_stable_ref(bfqq_data->stable_merge_bfqq);
bfq_put_stable_ref(bfqq_data[act_idx].stable_merge_bfqq);