From: Florian Fainelli <florian.fainelli@telecomint.eu>
To: Ingo Molnar <mingo@elte.hu>
Subject: Re: System clock runs too fast after 2.6.27 -> 2.6.28.1 upgrade
Date: Sun, 25 Jan 2009 12:18:31 +0100
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Cc: john stultz <johnstul@us.ibm.com>, Miklos Vajna <vmiklos@frugalware.org>,
       linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
       Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
       "Rafael J. Wysocki" <rjw@sisk.pl>,
       Gabriel C <nix.or.die@googlemail.com>,
       =?iso-8859-1?q?CS=C9CSY_L=E1szl=F3?= <boobaa@frugalware.org>,
       r.schwebel@pengutronix.de, sven@geggus.net
References: <20090121171423.GI21473@genesis.frugalware.org> <1f1b08da0901231736u46d8981ckc4b89ac66d7d8a5e@mail.gmail.com> <20090124091404.GA32032@elte.hu>
In-Reply-To: <20090124091404.GA32032@elte.hu>
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Le Saturday 24 January 2009 10:14:04 Ingo Molnar, vous avez =E9crit=A0:
> * john stultz <johnstul@us.ibm.com> wrote:
> > On Fri, Jan 23, 2009 at 3:04 AM, Ingo Molnar <mingo@elte.hu> wrote:
> > > * john stultz <johnstul@us.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 t=
he
> > >> 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).

=46ine with me. Ingo, is there any infrastructure yet to get an early quirk=
 set=20
the PIT tick rate accordingly ?
=2D-=20
Cordialement, Florian Fainelli
=2D-----------------------------

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