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authorAndreas Mohr <andi@rhlx01.fht-esslingen.de>2006-10-11 12:22:24 +0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-11 22:14:25 +0400
commitbf02c082bf7a464518d45b9c178b8aa83f74dd5d (patch)
tree8c0aafa48ec5e2298d76d58baf67bd59a5fa95ae /fs/bio.c
parent49a6cbe1cd8a72451d9d6ab5b1e163f17c1bbee3 (diff)
downloadlinux-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.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/fs/bio.c b/fs/bio.c
index 8f93e939f213..f95c8749499f 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -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)) {