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| author | Andreas Mohr <andi@rhlx01.fht-esslingen.de> | 2006-10-11 12:22:24 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-11 22:14:25 +0400 |
| commit | bf02c082bf7a464518d45b9c178b8aa83f74dd5d (patch) | |
| tree | 8c0aafa48ec5e2298d76d58baf67bd59a5fa95ae /fs/bio.c | |
| parent | 49a6cbe1cd8a72451d9d6ab5b1e163f17c1bbee3 (diff) | |
| download | linux-bf02c082bf7a464518d45b9c178b8aa83f74dd5d.tar.xz | |
[PATCH] fs/bio.c: tweaks
- Calculate a variable in bvec_alloc_bs() only once needed, not earlier
(bio.o down from 18408 to 18376 Bytes, 32 Bytes saved, probably due to
data locality improvements).
- Init variable idx to silence a gcc warning which already existed in the
unmodified original base file (bvec_alloc_bs() handles idx correctly, so
there's no need for the warning):
fs/bio.c: In function `bio_alloc_bioset':
fs/bio.c:169: warning: `idx' may be used uninitialized in this function
Signed-off-by: Andreas Mohr <andi@lisas.de>
Acked-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/bio.c')
| -rw-r--r-- | fs/bio.c | 9 |
1 files changed, 5 insertions, 4 deletions
@@ -79,7 +79,6 @@ static struct bio_set *fs_bio_set; static inline struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned long *idx, struct bio_set *bs) { struct bio_vec *bvl; - struct biovec_slab *bp; /* * see comment near bvec_array define! @@ -98,10 +97,12 @@ static inline struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned lon * idx now points to the pool we want to allocate from */ - bp = bvec_slabs + *idx; bvl = mempool_alloc(bs->bvec_pools[*idx], gfp_mask); - if (bvl) + if (bvl) { + struct biovec_slab *bp = bvec_slabs + *idx; + memset(bvl, 0, bp->nr_vecs * sizeof(struct bio_vec)); + } return bvl; } @@ -166,7 +167,7 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs) bio_init(bio); if (likely(nr_iovecs)) { - unsigned long idx; + unsigned long idx = 0; /* shut up gcc */ bvl = bvec_alloc_bs(gfp_mask, nr_iovecs, &idx, bs); if (unlikely(!bvl)) { |