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| author | Ming Lei <ming.lei@redhat.com> | 2019-02-27 13:40:13 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-02-28 13:56:03 +0100 |
| commit | 594b9a89af8e7629e95a4cd844d188361be32790 (patch) | |
| tree | 3ecf8a9d37bd6b7a7810e7c8ce8f2032dd578cf8 | |
| parent | block: optimize blk_bio_segment_split for single-page bvec (diff) | |
| download | linux-594b9a89af8e7629e95a4cd844d188361be32790.tar.xz linux-594b9a89af8e7629e95a4cd844d188361be32790.zip | |
block: introduce mp_bvec_for_each_page() for iterating over page
mp_bvec_for_each_segment() is a bit big for the iteration, so introduce
a light-weight helper for iterating over pages, then 32bytes stack
space can be saved.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | include/linux/bvec.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/bvec.h b/include/linux/bvec.h index 4376f683c08a..87e82e503a52 100644 --- a/include/linux/bvec.h +++ b/include/linux/bvec.h @@ -188,4 +188,9 @@ static inline void mp_bvec_last_segment(const struct bio_vec *bvec, } } +#define mp_bvec_for_each_page(pg, bv, i) \ + for (i = (bv)->bv_offset / PAGE_SIZE; \ + (i <= (((bv)->bv_offset + (bv)->bv_len - 1) / PAGE_SIZE)) && \ + (pg = bvec_nth_page((bv)->bv_page, i)); i += 1) + #endif /* __LINUX_BVEC_ITER_H */ |