linux-kernel - Re: [PATCH] drivers/cpufreq: Warn user when powernow-k8 tries to fall back to acpi-cpufreq and it is unavailable.

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Message-ID: <20130118190021.GD4062@pd.tnic>
Date:	Fri, 18 Jan 2013 20:00:21 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	"Gopalakrishnan, Aravind" <Aravind.Gopalakrishnan@....com>,
	"rjw@...k.pl" <rjw@...k.pl>, Andre Przywara <andre@...rep.de>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andreas <linuxuser330250@....net>
Subject: Re: [PATCH] drivers/cpufreq: Warn user when powernow-k8 tries to
 fall back to acpi-cpufreq and it is unavailable.

On Fri, Jan 18, 2013 at 06:07:55PM +0100, Borislav Petkov wrote:
> > Just flip the link order? It's only the way it is because in the
> > past we wanted to try hardware-specific drivers before more generic
> > ones, and I don't think that's a concern in this case now.
>
> Yeah, I heard that the acpi-idle and intel-idle drivers do that and also
> heard that it was a hack. It doesn't look too ugly IMHO:
>
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=2671717265ae6e720a9ba5f13fbec3a718983b65

Haha, this turns into one of those chicken-or-the-egg problems:

>From <drivers/cpufreq/Makefile>:

##################################################################################
# x86 drivers.
# Link order matters. K8 is preferred to ACPI because of firmware bugs in early
# K8 systems.
...

Great. :(

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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