linux-kernel - Re: 2.6.19-rc5-mm2

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Date:	Wed, 15 Nov 2006 21:42:19 +1100
From:	Reuben Farrelly <reuben-linuxkernel@...b.net>
To:	ego@...ibm.com
CC:	Andrew Morton <akpm@...l.org>, davej@...hat.com,
	linux-kernel@...r.kernel.org, venkatesh.pallipadi@...el.com,
	CPUFreq Mailing List <cpufreq@...ts.linux.org.uk>
Subject: Re: 2.6.19-rc5-mm2

Hi,

On 15/11/2006 9:34 PM, Gautham R Shenoy wrote:
> Hi,
> 
> On Tue, Nov 14, 2006 at 09:58:29PM +0100, Mattia Dongili wrote:
>> maybe this helps? mostly guessing here, but when cpufreq_userspace is
>> the default governor we may hit this path and leave policy->cur
>> unset.
> 
> I doubt if that's causing the problem. My reasons are:

Yes.  I just tried with the one-liner from Mattia as below, and unfortunately it 
made no difference.  The crash was the same..

Unfortunately I didn't get to test out 2.6.19-rc5-mm1 as there was some issue 
with it unable to mount my ext3/raid-1 root (fixed in -rc5-mm2), that I didn't 
have time to get to the bottom of.

So there is a chance that this cpufreq problem is not new to -rc5-mm2.

Reuben


> - Reuben's config shows his system to be a x64_64. So if I am not
>   mistaken, the correct file look for would be 
>   arch/ia64/kernel/cpufreq/acpi-cpufreq.c.
> 
> - The fix provided by you deals with the state of a 
>   driver(hardware) specific variable data->cpu_feature while the
>   governors like userspace/performance/powersave/ondemand are 
>   driver(hardware) independent.
> 
> Nevertheless, it could be a valid fix for i386 acpi_cpufreq considering
> that policy->cur is not being initialized if 
> data->cpu_feature == ACPI_ADR_SPACE_FIXED_HARDWARE.
> 
> Please check with Dave Jones or Venkatesh Pallipadi.
> 
> Thanks
> gautham.
> 
>> diff --git a/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c
>> index 18f4715..94e6e86 100644
>> --- a/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c
>> +++ b/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c
>> @@ -706,7 +706,7 @@ static int acpi_cpufreq_cpu_init(struct
>>  		break;
>>  	case ACPI_ADR_SPACE_FIXED_HARDWARE:
>>  		acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
>> -		get_cur_freq_on_cpu(cpu);
>> +		policy->cur = get_cur_freq_on_cpu(cpu);
>>  		break;
>>  	default:
>>  		break;
>>
>> -- 
>> mattia

-
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