block: remove bio_start_io_acct_time

bio_start_io_acct_time is not actually used anywhere, so remove it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221025155916.270303-1-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-core.c

@@ -945,18 +945,6 @@ unsigned long bdev_start_io_acct(struct block_device *bdev,
 }
 EXPORT_SYMBOL(bdev_start_io_acct);
 
-/**
- * bio_start_io_acct_time - start I/O accounting for bio based drivers
- * @bio:	bio to start account for
- * @start_time:	start time that should be passed back to bio_end_io_acct().
- */
-void bio_start_io_acct_time(struct bio *bio, unsigned long start_time)
-{
-	bdev_start_io_acct(bio->bi_bdev, bio_sectors(bio),
-			   bio_op(bio), start_time);
-}
-EXPORT_SYMBOL_GPL(bio_start_io_acct_time);
-
 /**
  * bio_start_io_acct - start I/O accounting for bio based drivers
  * @bio:	bio to start account for

include/linux/blkdev.h

@@ -1458,7 +1458,6 @@ unsigned long bdev_start_io_acct(struct block_device *bdev,
 void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
 		unsigned long start_time);
 
-void bio_start_io_acct_time(struct bio *bio, unsigned long start_time);
 unsigned long bio_start_io_acct(struct bio *bio);
 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
 		struct block_device *orig_bdev);