bfq_setup_merge
new_bfqq = bfq_setup_merge(bfqq, stable_merge_bfqq);
new_bfqq = bfq_setup_merge(bfqq, in_service_bfqq);
return bfq_setup_merge(bfqq, new_bfqq);
bfq_setup_merge(bfqq, last_bfqq_created);