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

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Message-Id: <200901251218.33255.florian.fainelli@telecomint.eu>
Date:	Sun, 25 Jan 2009 12:18:31 +0100
From:	Florian Fainelli <florian.fainelli@...ecomint.eu>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	john stultz <johnstul@...ibm.com>,
	Miklos Vajna <vmiklos@...galware.org>,
	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

Le Saturday 24 January 2009 10:14:04 Ingo Molnar, vous avez écrit :
> * 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).

Fine with me. Ingo, is there any infrastructure yet to get an early quirk set 
the PIT tick rate accordingly ?
-- 
Cordialement, Florian Fainelli
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