linux-kernel - Re: cfq: fix possible problem with jiffies wraparound

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Message-ID: <20091005064657.GP26573@kernel.dk>
Date:	Mon, 5 Oct 2009 08:46:58 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Corrado Zoccolo <czoccolo@...il.com>
Cc:	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Jeff Moyer <jmoyer@...hat.com>
Subject: Re: cfq: fix possible problem with jiffies wraparound

On Sun, Oct 04 2009, Corrado Zoccolo wrote:
> The RR service tree is indexed by a key that is relative to current jiffies.
> This can cause problems on jiffies wraparound.
> 
> The patch fixes it using time_before comparison, and changing
> the add_front path to use a relative number, too.

Good spotting, applied.

-- 
Jens Axboe

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