linux-kernel - Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c

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Date:	Wed, 27 Aug 2008 21:30:31 +0200
From:	Bernd Petrovitsch <bernd@...mix.at>
To:	Jamie Lokier <jamie@...reable.org>
Cc:	Parag Warudkar <parag.lkml@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Alan D. Brunelle" <Alan.Brunelle@...com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>, linux-embedded@...r.kernel.org
Subject: Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c -
	bisected

On Mit, 2008-08-27 at 18:51 +0100, Jamie Lokier wrote:
> Bernd Petrovitsch wrote:
[...]
> It is, but the idea that small embedded systems go through a 'all
> components are known, drivers are known, test and if it passes it's
> shippable' does not always apply.

Not always but often enough. And yes, there is ARM-based embedded
hardware with 1GB Flash-RAM and 128MB RAM.

> > > I'm seriously thinking of forwarding porting the 4 year old firmware
> > > from 2.4.26 to 2.6.current, just to get new drivers and capabilities.
> > 
> > That sounds reasonable (and I never meant maintaining the old system
> > infinitely.
> 
> Sounds reasonable, but it's vetoed for anticipated time and cost,

That is to be expected;-)

[....]
> > ACK. We avoid MMU-less hardware too - especially since there is enough
> > hardware with a MMU around.
> 
> I can't emphasise enough how much difference MMU makes to Linux userspace.
> 
> It's practically: MMU = standard Linux (with less RAM), have everything.
> No-MMU = lots of familiar 'Linux' things not available or break.

ACK. And tell that a customer that everything is more effort and more
risk and not just "simply cross-compile it as it runs on my desktop
too".

	Bernd
-- 
Firmix Software GmbH                   http://www.firmix.at/
mobil: +43 664 4416156                 fax: +43 1 7890849-55
          Embedded Linux Development and Services

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