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authorTejun Heo <htejun@gmail.com>2005-06-23 00:08:49 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-23 09:45:15 -0700
commitfa72b903f75e4f0f0b2c2feed093005167da4023 (patch)
tree12087e87fb8d41d10013946e5b2c91e57265c29e /include/linux/blkdev.h
parent2bf0fdad51c6710bf15d0bf4b9b30b8498fe4ddd (diff)
[PATCH] blk: remove blk_queue_tag->real_max_depth optimization
blk_queue_tag->real_max_depth was used to optimize out unnecessary allocations/frees on tag resize. However, the whole thing was very broken - tag_map was never allocated to real_max_depth resulting in access beyond the end of the map, bits in [max_depth..real_max_depth] were set when initializing a map and copied when resizing resulting in pre-occupied tags. As the gain of the optimization is very small, well, almost nill, remove the whole thing. 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 'include/linux/blkdev.h')
-rw-r--r--include/linux/blkdev.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 235c3414d268..8d7e2f4151d0 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -294,7 +294,6 @@ struct blk_queue_tag {
struct list_head busy_list; /* fifo list of busy tags */
int busy; /* current depth */
int max_depth; /* what we will send to device */
- int real_max_depth; /* what the array can hold */
atomic_t refcnt; /* map can be shared */
};