block, bfq: remove unused bfq_wr_max_time in struct bfq_data

bfqd->bfq_wr_max_time is set to 0 in bfq_init_queue and is never changed.
It is only used in bfq_wr_duration when bfq_wr_max_time > 0 which never
meets, so bfqd->bfq_wr_max_time is not used actually. Just remove it.
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230116095153.3810101-9-shikemeng@huaweicloud.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/bfq-iosched.c

@@ -1093,9 +1093,6 @@ static unsigned int bfq_wr_duration(struct bfq_data *bfqd)
 {
 	u64 dur;
 
-	if (bfqd->bfq_wr_max_time > 0)
-		return bfqd->bfq_wr_max_time;
-
 	dur = bfqd->rate_dur_prod;
 	do_div(dur, bfqd->peak_rate);
 
@@ -7299,7 +7296,6 @@ static int bfq_init_queue(struct request_queue *q, struct elevator_type *e)
 	 */
 	bfqd->bfq_wr_coeff = 30;
 	bfqd->bfq_wr_rt_max_time = msecs_to_jiffies(300);
-	bfqd->bfq_wr_max_time = 0;
 	bfqd->bfq_wr_min_idle_time = msecs_to_jiffies(2000);
 	bfqd->bfq_wr_min_inter_arr_async = msecs_to_jiffies(500);
 	bfqd->bfq_wr_max_softrt_rate = 7000; /*

block/bfq-iosched.h

@@ -769,8 +769,6 @@ struct bfq_data {
 	 * is multiplied.
 	 */
 	unsigned int bfq_wr_coeff;
-	/* maximum duration of a weight-raising period (jiffies) */
-	unsigned int bfq_wr_max_time;
 
 	/* Maximum weight-raising duration for soft real-time processes */
 	unsigned int bfq_wr_rt_max_time;