linux-kernel - Re: Badness at mm/backing-dev.c:179

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Date:	Wed, 3 Dec 2008 11:06:00 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Kay Sievers" <kay.sievers@...y.org>
Cc:	"Mark Jackson" <mpfj@...c.co.uk>, linux-kernel@...r.kernel.org,
	"Haavard Skinnemoen" <haavard.skinnemoen@...el.com>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"David Woodhouse" <dwmw2@...radead.org>
Subject: Re: Badness at mm/backing-dev.c:179

On Wed, 3 Dec 2008 13:22:47 +0100 "Kay Sievers" <kay.sievers@...y.org> wrote:

> On Wed, Dec 3, 2008 at 13:07, Mark Jackson <mpfj@...c.co.uk> wrote:
> > The following commit causes a "Badness at mm/backing-dev.c:179":-
> >
> > f1d0b063d993527754f062c589b73f125024d216 is first bad commit
> > commit f1d0b063d993527754f062c589b73f125024d216
> > Author: Kay Sievers <kay.sievers@...y.org>
> > Date:   Tue Dec 2 10:31:50 2008 -0800
> >
> >    bdi: register sysfs bdi device only once per queue
> 
> > Below is the extract from dmesg:-
> >
> > ------------[ cut here ]------------
> > Badness at mm/backing-dev.c:179
> 
> That's a known issue, and will not cause any harm besides printing
> this warning. Andrew added the warning to catch drivers who use one
> single request queue for multiple devices. Currently known are mtd and
> floppy (triggers only if you have more than one device per driver).
> The drivers need to be changed to use a separate queue per device, to
> get rid of this warning.

Actually, adding that warning wasn't such a great idea - we'll just get
heaps of email about things we already know about.  I think I'll take
it out again.

Which means this stuff won't get fixed for ages :(
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