1790  * Get the index of the actuator that will serve bio.
4766  * Perform a linear scan of each actuator, until an actuator is found
4768  * actuator is below the threshold (see comments on
4770  * next actuator (comments on this extra condition below), and there
4771  * is a queue that contains I/O for that actuator. On success, return
4828 	 *  If some actuator is underutilized, but the in-service  in bfq_select_queue()
4829 	 *  queue does not contain I/O for that actuator, then try to  in bfq_select_queue()
4830 	 *  inject I/O for that actuator.  in bfq_select_queue()
5490 	 * longer, then cycle over all possible per-actuator bfqqs in  in bfq_exit_icq()
5492 	 * therefore on its unused per-actuator fields being NULL.  in bfq_exit_icq()
5775 	 * each actuator. Therefore some actuator may be  in bfq_do_or_sched_stable_merge()
7164 	unsigned int actuator;  in bfq_exit_queue()  local
7173 	for (actuator = 0; actuator < bfqd->num_actuators; actuator++)  in bfq_exit_queue()
7174 		WARN_ON_ONCE(bfqd->rq_in_driver[actuator]);  in bfq_exit_queue()
7240 	 * Set zero as actuator index: we will pretend that  in bfq_init_queue()
7241 	 * all I/O requests are for the same actuator.  in bfq_init_queue()
7271 		 * actuator limit.  in bfq_init_queue()
7276 			pr_crit("Falling back to single actuator mode.\n");  in bfq_init_queue()
7288 	/* Otherwise use single-actuator dev info */  in bfq_init_queue()