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

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Message-Id: <200703300006.24960.ak@suse.de>
Date:	Fri, 30 Mar 2007 00:06:22 +0200
From:	Andi Kleen <ak@...e.de>
To:	Andreas Mohr <andi@...x01.fht-esslingen.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mark Langsdorf <mark.langsdorf@....com>,
	Len Brown <lenb@...nel.org>,
	"Morrow, William" <William.Morrow@....com>,
	"Crouse, Jordan" <jordan.crouse@...mail.amd.com>,
	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"

On Thursday 29 March 2007 23:45, Andreas Mohr wrote:
> Hi,
> 
> On Thu, Mar 29, 2007 at 02:16:54PM -0700, Linus Torvalds wrote:
> > 
> > 
> > On Thu, 29 Mar 2007, Andi Kleen wrote:
> > > 
> > > Here's a patch. I don't have a system with C1E, so i only tested that
> > > the apic timer still works on a older AMD box.
> > 
> > I think this looks better than what we have now, but it would look even 
> > better if the core CPUID stuff was in arch/i386/kernel/cpu/amd.c, and we 
> > simply had X86_FEATURE_BROKEN_C1_LAPIC etc..
> 
> Please don't, this would break the interface logically.

We already have several of those. And negative is much easier. 

-Andi
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