linux-kernel - Re: Regression in 2.6.27-rc2 in acpi_processor

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Date:	Fri, 8 Aug 2008 23:02:10 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Langsdorf, Mark" <mark.langsdorf@....com>
Cc:	"lkml" <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Regression in 2.6.27-rc2 in acpi_processor_init()

[Adding CCs]

On Friday, 8 of August 2008, Langsdorf, Mark wrote:
> I got a regression when updated from 2.6.27-rc1 ro
> 2.6.27-rc2.  The noticeable symptom is the powernow-k8
> driver stopped working because the call to 
> acpi_processor_register_performance() is returning
> -EINVAL.
> 
> Digging into the code a bit more, that's occurring
> because acpi_processor_ppc_status is not set.
> That should be set in acpi_processor_init(), but
> that function is failing to register the ACPI
> processor driver.
> 
> I've dug through the code and can't see why 
> that call would fail.  It doesn't look like there
> were any changes between 2.6.27-rc1 and 2.6.27-rc2,
> but I may have missed something.
> 
> Any advice or suggestions in debugging this 
> appreciated.
> 
> -Mark Langsdorf
> Operating System Research Center
> AMD


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