]> err.no Git - linux-2.6/commit
[PATCH] blk: remove blk_queue_tag->real_max_depth optimization
authorTejun Heo <htejun@gmail.com>
Thu, 23 Jun 2005 07:08:49 +0000 (00:08 -0700)
committerLinus Torvalds <torvalds@ppc970.osdl.org>
Thu, 23 Jun 2005 16:45:15 +0000 (09:45 -0700)
commitfa72b903f75e4f0f0b2c2feed093005167da4023
tree12087e87fb8d41d10013946e5b2c91e57265c29e
parent2bf0fdad51c6710bf15d0bf4b9b30b8498fe4ddd
[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>
drivers/block/ll_rw_blk.c
include/linux/blkdev.h