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block: always define BIO_MAX_PAGES as 256

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Now multi-page bvec can cover CONFIG_THP_SWAP, so we don't need to
increase BIO_MAX_PAGES for it.

CONFIG_THP_SWAP needs to split one THP into normal pages and adds
them all to one bio. With multipage-bvec, it just takes one bvec to
hold them all.

Reviewed-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2019-02-15 19:13:21 +08:00 committed by Jens Axboe
parent 07173c3ec2
commit 6861428921
1 changed files with 0 additions and 8 deletions
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8
include/linux/bio.h
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@ -34,15 +34,7 @@
#define BIO_BUG_ON
#endif
#ifdef CONFIG_THP_SWAP
#if HPAGE_PMD_NR > 256
#define BIO_MAX_PAGES HPAGE_PMD_NR
#else
#define BIO_MAX_PAGES 256
#endif
#else
#define BIO_MAX_PAGES 256
#endif
#define bio_prio(bio) (bio)->bi_ioprio
#define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio)