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authorJens Axboe <axboe@fb.com>2015-07-28 13:14:32 -0600
committerJens Axboe <axboe@fb.com>2015-07-29 08:55:25 -0600
commit2c68f6dc6e621153a708bef6c569805762da2020 (patch)
treef5232fa96a9049981479daf8e2d5818f70878a28 /include/linux/bio.h
parentb7c44ed9d2fc6b461378c65eaf144ccc80a47772 (diff)
block: shrink struct bio down to 2 cache lines again
Commit bcf2843b3f8f added ->bi_error to cleanup the error passing for struct bio, but that ended up adding 4 bytes and a 4 byte hole to the size of struct bio. For a clean config, that bumped it from 128 bytes, to 136 bytes, on x86-64. The ->bi_flags member is currently an unsigned long, but it fits easily within an int. Change it to an unsigned int, adjust the the pool offset code, and move ->bi_error into the new hole. Then we end up with a 128 byte bio again. Change the bio flag set/clear to use cmpxchg to ensure we don't lose any flags when manipulating them. Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/bio.h')
-rw-r--r--include/linux/bio.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 986e6e19feb5..b7892a1906bd 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -306,17 +306,17 @@ static inline void bio_cnt_set(struct bio *bio, unsigned int count)
static inline bool bio_flagged(struct bio *bio, unsigned int bit)
{
- return (bio->bi_flags & (1UL << bit)) != 0;
+ return (bio->bi_flags & (1U << bit)) != 0;
}
static inline void bio_set_flag(struct bio *bio, unsigned int bit)
{
- bio->bi_flags |= (1UL << bit);
+ bio->bi_flags |= (1U << bit);
}
static inline void bio_clear_flag(struct bio *bio, unsigned int bit)
{
- bio->bi_flags &= ~(1UL << bit);
+ bio->bi_flags &= ~(1U << bit);
}
enum bip_flags {