tree e372f6bef5205c12024512f3b1df5a76df7f0fba
parent a8db2db1e6a8d323d87a67c5391d48fe2b97faf5
author Christoph Hellwig <hch@lst.de> 1130713299 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1130722637 -0800

[PATCH] cfq-iosched: move tasklist walk to elevator.c

We're trying to get rid of as much as possible tasklist walks, or at
least moving them to core code.  This patch falls into the second
category.

Instead of walking the tasklist in cfq-iosched move that into
elv_unregister.  The added benefit is that with this change the as
ioscheduler might be might unloadable more easily aswell.

The new code uses read_lock instead of read_lock_irq because the
tasklist_lock only needs irq disabling for writers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>