linux-kernel - Re: [tip:x86/urgent] x86, apic: Fix apic=debug boot crash

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Message-ID: <20100823081212.GA13297@router-fw-old.local.net-space.pl>
Date:	Mon, 23 Aug 2010 10:12:12 +0200
From:	Daniel Kiper <dkiper@...-space.pl>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, dkiper@...-space.pl, mingo@...e.hu,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86, apic: Fix apic=debug boot crash

Hi,

On Fri, Aug 20, 2010 at 12:24:20PM -0700, Yinghai Lu wrote:
> On Fri, Aug 20, 2010 at 5:41 AM, tip-bot for Daniel Kiper
> <dkiper@...-space.pl> wrote:
> > Commit-ID: ?05e407603e527f9d808dd3866d3a17c2ce4dfcc5
> > Gitweb: ? ? http://git.kernel.org/tip/05e407603e527f9d808dd3866d3a17c2ce4dfcc5
> > Author: ? ? Daniel Kiper <dkiper@...-space.pl>
> > AuthorDate: Fri, 20 Aug 2010 00:46:16 +0200
> > Committer: ?Ingo Molnar <mingo@...e.hu>
> > CommitDate: Fri, 20 Aug 2010 10:18:28 +0200
> >
> > x86, apic: Fix apic=debug boot crash
> >
> > Fix a boot crash when apic=debug is used and the APIC is
> > not properly initialized.
> >
> > This issue appears during Xen Dom0 kernel boot but the
> > fix is generic and the crash could occur on real hardware
> > as well.
>
> Do you have any report on real hardware?
> that could not happen on real hardware.

Till now no, however I think it is good idea
to apply this patch now. It is not worth to wait
for another null pointer dereference.

Daniel
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