linux-kernel - Re: [PATCH] mm: fix page_mkclean_one (was: 2.6.19 file content corruption on ext3)

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Message-ID: <20061220221141.GB13129@flint.arm.linux.org.uk>
Date:	Wed, 20 Dec 2006 22:11:42 +0000
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Martin Michlmayr <tbm@...ius.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Hugh Dickins <hugh@...itas.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Linus Torvalds <torvalds@...l.org>,
	Andrei Popa <andrei.popa@...eo.ro>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Florian Weimer <fw@...eb.enyo.de>,
	Marc Haber <mh+linux-kernel@...schlus.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Arnd Bergmann <arnd.bergmann@...ibm.com>,
	gordonfarquharson@...il.com
Subject: Re: [PATCH] mm: fix page_mkclean_one (was: 2.6.19 file content corruption on ext3)

On Wed, Dec 20, 2006 at 06:03:23PM +0100, Martin Michlmayr wrote:
> * Peter Zijlstra <a.p.zijlstra@...llo.nl> [2006-12-20 14:56]:
> > page_mkclean_one() fix
> 
> This patch doesn't fix my problem (apt segfaults on ARM because its
> database is corrupted).

Are you using IDE in PIO mode?  If so, the bug probably lies there.

As I've said repeatedly when asked by IDE folk to test their PIO-based
cache coherency fixes, I am unable to reproduce the bug, ergo I am
unable to test the fix.

(Some people, such as Jeff Garzik to name names, took that as me being
entirely unreasonable and un-cooperative.  But consider carefully - how
can _anyone_ test something that they can't produce.  I consider Jeff's
comments extremely very childish in that respect.)

Hence, as far as I'm aware, Linux on PIO-based IDE ARM hardware remains
utterly *unsafe*.

Sorry.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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