linux-kernel - Re: [PATCH] i386: add command line option "local_apic_timer_c2

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Message-ID: <p73hcs42kuq.fsf@bingen.suse.de>
Date:	29 Mar 2007 16:19:25 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Len Brown <lenb@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Pavel Machek <pavel@....cz>, Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Mingming Cao <cmm@...ibm.com>, Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Mariusz Kozlowski <m.kozlowski@...land.pl>,
	Oliver Pinter <oliver.pntr@...il.com>,
	Sid Boyce <g3vbv@...eyonder.co.uk>,
	Nick Piggin <npiggin@...e.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Renninger <trenn@...e.de>
Subject: Re: [PATCH] i386: add command line option "local_apic_timer_c2_ok"

Linus Torvalds <torvalds@...ux-foundation.org> writes:

> On Tue, 27 Mar 2007, Len Brown wrote:
> > 
> > I think the only fool-proof way to do this automatically is to
> 
> Why not just take the known-good CPUID signature?

I didn't think we could reliably distingush mobile cpus with C2+ 
versus desktop CPUs without it. Or rather you would need a table
for each new CPU revision Intel/AMD put out. That would be probably
quite nightmarish to maintain.

-Andi
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