From 0e7be9edb9134f833278c381b6feabb54b875208 Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Wed, 7 Nov 2007 13:51:35 +0100
Subject: [PATCH] cfq_idle_class_timer: add paranoid checks for jiffies
 overflow

In theory, if the queue was idle long enough, cfq_idle_class_timer may have
a false (and very long) timeout because jiffies can wrap into the past wrt
->last_end_request.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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