if (nrq == q->unplug_thresh) 
if (nrq >= q->unplug_thresh) 
void __elv_add_request(request_queue_t *q, struct request *rq, int where,		       int plug){	/*	 * barriers implicitly indicate back insertion	 */	if (rq->flags & (REQ_SOFTBARRIER | REQ_HARDBARRIER) &&	    where == ELEVATOR_INSERT_SORT)		where = ELEVATOR_INSERT_BACK;	if (plug)		blk_plug_device(q);	rq->q = q;	if (!test_bit(QUEUE_FLAG_DRAIN, &q->queue_flags)) {		q->elevator->ops->elevator_add_req_fn(q, rq, where);		if (blk_queue_plugged(q)) {			int nrq = q->rq.count[READ] + q->rq.count[WRITE]				  - q->in_flight;			if (nrq == q->unplug_thresh)				__generic_unplug_device(q);		}	} else		/*		 * if drain is set, store the request "locally". when the drain		 * is finished, the requests will be handed ordered to the io		 * scheduler		 */		list_add_tail(&rq->queuelist, &q->drain_list);}
10457	/local/tlutelli/issta_data/temp/c/2005_temp/2005/10457/c374f127e4ff17a318b9ae95a5bf65f370c2d0b1/elevator.c/clean/drivers/block/elevator.c