blk-mq: remove 'tag' parameter from mq_ops->poll()

We always pass in -1 now and none of the callers use the tag value,
remove the parameter.
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

block/blk-mq.c

@@ -3380,7 +3380,7 @@ static int blk_mq_poll(struct request_queue *q, blk_qc_t cookie)
 
 		hctx->poll_invoked++;
 
-		ret = q->mq_ops->poll(hctx, -1U);
+		ret = q->mq_ops->poll(hctx);
 		if (ret > 0) {
 			hctx->poll_success++;
 			__set_current_state(TASK_RUNNING);

drivers/nvme/host/pci.c

@@ -1075,14 +1075,14 @@ static int __nvme_poll(struct nvme_queue *nvmeq, unsigned int tag)
 	return found;
 }
 
-static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag)
+static int nvme_poll(struct blk_mq_hw_ctx *hctx)
 {
 	struct nvme_queue *nvmeq = hctx->driver_data;
 
-	return __nvme_poll(nvmeq, tag);
+	return __nvme_poll(nvmeq, -1);
 }
 
-static int nvme_poll_noirq(struct blk_mq_hw_ctx *hctx, unsigned int tag)
+static int nvme_poll_noirq(struct blk_mq_hw_ctx *hctx)
 {
 	struct nvme_queue *nvmeq = hctx->driver_data;
 	u16 start, end;
@@ -1092,7 +1092,7 @@ static int nvme_poll_noirq(struct blk_mq_hw_ctx *hctx, unsigned int tag)
 		return 0;
 
 	spin_lock(&nvmeq->cq_lock);
-	found = nvme_process_cq(nvmeq, &start, &end, tag);
+	found = nvme_process_cq(nvmeq, &start, &end, -1);
 	spin_unlock(&nvmeq->cq_lock);
 
 	nvme_complete_cqes(nvmeq, start, end);

drivers/nvme/host/rdma.c

@@ -1736,7 +1736,7 @@ static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
 	return BLK_STS_IOERR;
 }
 
-static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag)
+static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx)
 {
 	struct nvme_rdma_queue *queue = hctx->driver_data;
 	struct ib_cq *cq = queue->ib_cq;

include/linux/blk-mq.h

@@ -132,7 +132,7 @@ typedef void (exit_request_fn)(struct blk_mq_tag_set *set, struct request *,
 typedef bool (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
 		bool);
 typedef bool (busy_tag_iter_fn)(struct request *, void *, bool);
-typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int);
+typedef int (poll_fn)(struct blk_mq_hw_ctx *);
 typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
 typedef bool (busy_fn)(struct request_queue *);
 typedef void (complete_fn)(struct request *);