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: <20130118170755.GB4062@pd.tnic>
Date:	Fri, 18 Jan 2013 18:07:55 +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 04:23:47PM +0000, Matthew Garrett wrote:
> On Thu, Jan 17, 2013 at 12:54:37PM +0100, Borislav Petkov wrote:
> 
> > So, handoff to acpi-cpufreq still has some issues. When both are
> > built-in, the module_init functions turn into normal initcalls and
> > in that case, they're executed in link order and it can happen that
> > powernowk8_init() runs before acpi_cpufreq_init().
> 
> 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

-- 
Regards/Gruss,
    Boris.

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