linux-kernel - Re: [PATCH 1/2] CPUFREQ: Enable acpi-cpufreq driver for VIA/Centaur CPUs

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Message-Id: <200906090726.14187.lkml@morethan.org>
Date:	Tue, 9 Jun 2009 07:26:11 -0500
From:	"Michael S. Zick" <lkml@...ethan.org>
To:	Harald Welte <HaraldWelte@...tech.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Duane Griffin <duaneg@...da.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: [PATCH 1/2] CPUFREQ: Enable acpi-cpufreq driver for VIA/Centaur CPUs

On Mon June 8 2009, Harald Welte wrote:
> On Mon, Jun 08, 2009 at 11:35:12AM -0700, Linus Torvalds wrote:
> > Hmm. This all really should be just
> > 
> > 	static int check_est_cpu(unsigned int cpuid)
> > 	{
> > 		struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
> > 		return cpu_has(cpu, X86_FEATURE_EST);
> > 	}
> > 
> > I suspect, with no vendor tests. That's the whole _point_ of CPU features, 
> > after all.
> 
> That's what I was thinking, too.  If there was no such vendor test, it would
> have worked ever since the code was written (the C7 is by far not a new
> component, it's around for years).
> 
> > If some vendor claims EST but doesn't actually support the EST interfaces, 
> > we should just have fixups to clear the bit in the per-vendor cpuinfo 
> > code, not in some random driver.
> 
> agreed.
> 
> > The only thing that makes me nervous about this is how close to 2.6.30 we 
> > are. I'd be happier if this was resolved by doing this as a patch 
> > post-2.6.30, and then adding 'stable@...nel.org' as a Cc: tag, and 
> > backporting it to 2.6.30.1 if no problems appear. 
> > 
> > It's not like this is a regression, I think.
> > 
> > Does that sound like a reasonable plan?
> 
> Sounds fine with me. But what I would definitely suggest merging before 2.6.30
> is the marking e_powersaver EXPERIMENTAL + DANGEROUS patch.
>

As posted somewhere in this thread,
the acpi-cpufreq controller appears to work on my machine in initial tests.

A few tests on only one machine is not much to go on and it
isn't enough to call it "tested" but is forward progress. 

I was only risking my "throw-away" machine yesterday, will see what
happens on the "good" one today (the HP-2133).

@H.W. - are you running any of these changes on your HP-2133?

Mike
> Regards,


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