tree 989f440665d529587fcc6365b1968e2b29fb7c94
parent a63a5cf84dac7a23a57c800eea5734701e7d3c04
author Konstantin Khlebnikov <khlebnikov@openvz.org> 1301868902 +0200
committer Jens Axboe <jaxboe@fusionio.com> 1302040369 +0200

block: fix request sorting at unplug

Comparison function for list_sort() must be anticommutative,
otherwise it is not sorting in ordinary meaning.

But fortunately list_sort() always check ((*cmp)(priv, a, b) <= 0)
it not distinguish negative and zero, so comparison function can
implement only less-or-equal instead of full three-way comparison.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>