linux-kernel - Re: System clock runs too fast after 2.6.27 -> 2.6.28.1 upgrade

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Message-ID: <20090124091404.GA32032@elte.hu>
Date:	Sat, 24 Jan 2009 10:14:04 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	john stultz <johnstul@...ibm.com>
Cc:	Miklos Vajna <vmiklos@...galware.org>,
	Florian Fainelli <florian.fainelli@...ecomint.eu>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Gabriel C <nix.or.die@...glemail.com>,
	CSÉCSY László <boobaa@...galware.org>,
	r.schwebel@...gutronix.de, sven@...gus.net
Subject: Re: System clock runs too fast after 2.6.27 -> 2.6.28.1 upgrade


* john stultz <johnstul@...ibm.com> wrote:

> On Fri, Jan 23, 2009 at 3:04 AM, Ingo Molnar <mingo@...e.hu> wrote:
> > * john stultz <johnstul@...ibm.com> wrote:
> >> I'd think this would ideally be more of a subarch in the config
> >> selection like the AMD Elan is, so folks know it really is not just a
> >> extra-support feature and in fact limits what hardware you can use the
> >> resulting kernel on.
> >
> > a better solution is that if RDC is set [it is unset by default] we should
> > turn PIT_TICK_RATE into a variable, defaulting it to 1193182. If a real
> > RDC or ELAN system is running, that variable is changed during early
> > bootup, in the init functions for those platforms.
> 
> Took a quick look at this, and I don't see any detection code for either 
> RDC. The X86_ELAN config also has no conditionals, but maybe the elan 
> cpufreq code can help here.

i'd suggest to just remove the #ifdef for now (it's causing problems) and 
add the variable - we can add the quirks for those two platforms later on, 
separately from your patch(es).

	Ingo
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