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

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Date:	Sun, 10 Aug 2008 11:34:36 +0800
From:	Zhao Yakui <yakui.zhao@...el.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Langsdorf, Mark" <mark.langsdorf@....com>
Cc:	"Langsdorf, Mark" <mark.langsdorf@....com>,
	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()

On Fri, 2008-08-08 at 23:02 +0200, Rafael J. Wysocki wrote:
> [Adding CCs]
> 
Hi, Mark
   Will you please attach the output of acpidump on bug 11287?
   Of course it will be great if you can enable CONFIG_ACPI_DEBUG and
CONFIG_CPUFREQ_DEBUG in kernel configuration  and boot the system with
the option of "cpufreq.debug=7 acpi.debug_layer=0x01010000
acpi.debug_level=0x17".
   After the system is booted, please attach the output of dmesg.
   Please do the above test on both kernel 2.6.27-rc1 and 2.6.27-rc2.

Thanks.
> 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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