From: Konstantin Khlebnikov <khlebnikov@openvz.org>
Date: Sun, 3 Apr 2011 22:15:02 +0000 (+0200)
Subject: block: fix request sorting at unplug
X-Git-Tag: v2.6.39-rc2~1^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f83e826181f7f8fb152e4190d03854fc3a5dd040;p=pandora-kernel.git

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>
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