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

Andrew Morton
2008-12-03T19:07:13Z

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

> On Wed, Dec 3, 2008 at 13:07, Mark Jackson <mpfj@mimc.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@vrfy.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 :(