blk-mq: remove blk_qc_t_valid

Move the trivial check into the only caller.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Tested-by: Mark Wunderlich <mark.wunderlich@intel.com>
Link: https://lore.kernel.org/r/20211012111226.760968-9-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-mq.c

@@ -4098,7 +4098,7 @@ static int blk_mq_poll_classic(struct request_queue *q, blk_qc_t cookie,
  */
 int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin)
 {
-	if (!blk_qc_t_valid(cookie) ||
+	if (cookie == BLK_QC_T_NONE ||
 	    !test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
 		return 0;
 

include/linux/blk_types.h

@@ -500,11 +500,6 @@ typedef unsigned int blk_qc_t;
 #define BLK_QC_T_SHIFT		16
 #define BLK_QC_T_INTERNAL	(1U << 31)
 
-static inline bool blk_qc_t_valid(blk_qc_t cookie)
-{
-	return cookie != BLK_QC_T_NONE;
-}
-
 struct blk_rq_stat {
 	u64 mean;
 	u64 min;