linux-kernel - Re: [PATCH] x86: avoid early crash in disable_local

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Message-ID: <alpine.LFD.1.10.0901162122520.29021@ftp.linux-mips.org>
Date:	Fri, 16 Jan 2009 21:26:38 +0000 (GMT)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Jan Beulich <jbeulich@...ell.com>
cc:	Ingo Molnar <mingo@...e.hu>, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, hpa@...or.com
Subject: Re: [PATCH] x86: avoid early crash in disable_local_APIC()

On Fri, 16 Jan 2009, Jan Beulich wrote:

> Is this with a config that has X86_IO_APIC off (i.e. one the practical use of
> which I never understood, and hence easily forget to consider)? Otherwise
> I can't see how that could happen.

 A lot of systems have a P6-class CPU which has a local APIC and no I/O 
APIC in the chipset.  My old laptop was an example of one.  It saves some 
memory to have X86_IO_APIC disabled on such systems, while still being 
able to use the local APIC for the NMI watchdog and PeMo.

  Maciej
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