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

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Message-ID: <20091005065017.GQ26573@kernel.dk>
Date:	Mon, 5 Oct 2009 08:50:17 +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 Mon, Oct 05 2009, Jens Axboe wrote:
> 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.

Your mailer seems to screw up your patches, it's white space damaged
(tabs are spaces). I hand applied it, but you probably want to check
that out and get it fixed.

-- 
Jens Axboe

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