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Message-ID: <20080906180950.GA18649@elte.hu>
Date: Sat, 6 Sep 2008 20:09:50 +0200
From: Ingo Molnar <mingo@...e.hu>
To: Jeremy Fitzhardinge <jeremy@...p.org>
Cc: Hugh Dickins <hugh@...itas.com>,
Rafał Miłecki <zajec5@...il.com>,
Alan Jenkins <alan-jenkins@...fmail.co.uk>,
Alan Cox <alan@...rguk.ukuu.org.uk>,
Yinghai Lu <yhlu.kernel@...il.com>,
"H. Peter Anvin" <hpa@...or.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Dave Jones <davej@...hat.com>
Subject: Re: [PATCH RFC] x86: check for and defend against BIOS memory
corruption
* Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> > I would prefer you both to use the minimal memmap= solutions for
> > now; but others may disagree.
>
> The fact that we're seeing this problem in two completely different
> systems with different BIOSes and everything else makes me worried
> that this is quite widespread. It's only the persistence and
> diligence of our bug reporters that we managed to work out that
> they're the same problem. How many other people are getting strange
> crashes and haven't managed to correlate it any particular BIOS
> interaction? Or just happen to be corrupting memory we don't care
> about right now, but is only a small code change or link order change
> away from disaster?
please put this all behind a .config debug option that distros can turn
on/off. Also, when it's enabled in the .config, there should be another
.config option that marks it disabled by default but it can be enabled
via a boot parameter.
Distro debug kernels will most likely enable the .config - even release
kernels might enable it it, with default off - users can enable the boot
switch if they suspect something, without having to build a new kernel.
Ingo
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