block/mq-deadline: Remove redundant hctx pointer dereferencing operation

The value of 'hctx->queue' is already stored in '*q' within
dd_insert_requests, we can directly reuse the result instead of
dereferencing hctx again in the dd_insert_request function. This
patch removes the redundant operation and modifies the function's
parameters accordingly. We can eliminate an LDR instruction.

Signed-off-by: Chengkaitao <[email protected]>

Author: Chengkaitao

block/mq-deadline.c

@@ -633,10 +633,9 @@ static bool dd_bio_merge(struct request_queue *q, struct bio *bio,
 /*
  * add rq to rbtree and fifo
  */
-static void dd_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
+static void dd_insert_request(struct request_queue *q, struct request *rq,
 			      blk_insert_t flags, struct list_head *free)
 {
-	struct request_queue *q = hctx->queue;
 	struct deadline_data *dd = q->elevator->elevator_data;
 	const enum dd_data_dir data_dir = rq_data_dir(rq);
 	u16 ioprio = req_get_ioprio(rq);
@@ -694,7 +693,7 @@ static void dd_insert_requests(struct blk_mq_hw_ctx *hctx,
 
 		rq = list_first_entry(list, struct request, queuelist);
 		list_del_init(&rq->queuelist);
-		dd_insert_request(hctx, rq, flags, &free);
+		dd_insert_request(q, rq, flags, &free);
 	}
 	spin_unlock(&dd->lock);