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| author | Tejun Heo <htejun@gmail.com> | 2005-06-23 00:08:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-23 09:45:15 -0700 |
| commit | 2bf0fdad51c6710bf15d0bf4b9b30b8498fe4ddd (patch) | |
| tree | e4dea0ce02413260ca4dfc3b7de0bb91570f331b /drivers/block | |
| parent | 15d20bfd606c4b4454aeaa05fc86f77994e48c92 (diff) | |
| download | op-kernel-dev-2bf0fdad51c6710bf15d0bf4b9b30b8498fe4ddd.zip op-kernel-dev-2bf0fdad51c6710bf15d0bf4b9b30b8498fe4ddd.tar.gz | |
[PATCH] blk: use find_first_zero_bit() in blk_queue_start_tag()
blk_queue_start_tag() hand-coded searching for the first zero bit in the tag
map. Replace it with find_first_zero_bit(). With this patch,
blk_queue_star_tag() doesn't need to fill remains of tag map with 1, thus
allowing it to work properly with the next remove_real_max_depth patch.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Acked-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/ll_rw_blk.c | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c index cd8cf30..808390c 100644 --- a/drivers/block/ll_rw_blk.c +++ b/drivers/block/ll_rw_blk.c @@ -968,8 +968,7 @@ EXPORT_SYMBOL(blk_queue_end_tag); int blk_queue_start_tag(request_queue_t *q, struct request *rq) { struct blk_queue_tag *bqt = q->queue_tags; - unsigned long *map = bqt->tag_map; - int tag = 0; + int tag; if (unlikely((rq->flags & REQ_QUEUED))) { printk(KERN_ERR @@ -978,14 +977,10 @@ int blk_queue_start_tag(request_queue_t *q, struct request *rq) BUG(); } - for (map = bqt->tag_map; *map == -1UL; map++) { - tag += BLK_TAGS_PER_LONG; - - if (tag >= bqt->max_depth) - return 1; - } + tag = find_first_zero_bit(bqt->tag_map, bqt->max_depth); + if (tag >= bqt->max_depth) + return 1; - tag += ffz(*map); __set_bit(tag, bqt->tag_map); rq->flags |= REQ_QUEUED; |
