elevator_switch_mq 3242 block/blk-mq.c 	elevator_switch_mq(q, NULL);
elevator_switch_mq 3267 block/blk-mq.c 	elevator_switch_mq(q, t);
elevator_switch_mq  200 block/blk.h    int elevator_switch_mq(struct request_queue *q,
elevator_switch_mq  719 block/elevator.c 	err = elevator_switch_mq(q, new_e);