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block: change the blk_queue_split calling convention

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The double indirect bio leads to somewhat suboptimal code generation.
Instead return the (original or split) bio, and make sure the
request_queue arguments to the lower level helpers is passed after the
bio to avoid constant reshuffling of the argument passing registers.

Also give it and the helpers used to implement it more descriptive names.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220727162300.3089193-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2022-07-27 12:22:55 -04:00
committed by Jens Axboe
parent de474b550e
commit 5a97806f7d
11 changed files with 63 additions and 65 deletions
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2
drivers/block/drbd/drbd_req.c
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@@ -1608,7 +1608,7 @@ void drbd_submit_bio(struct bio *bio)
{
struct drbd_device *device = bio->bi_bdev->bd_disk->private_data;
blk_queue_split(&bio);
bio = bio_split_to_limits(bio);
/*
* what we "blindly" assume: