linux-kernel - Re: 2.6.19-rc5-mm2

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Message-ID: <20061115103419.GA3131@in.ibm.com>
Date:	Wed, 15 Nov 2006 16:04:19 +0530
From:	Gautham R Shenoy <ego@...ibm.com>
To:	Gautham R Shenoy <ego@...ibm.com>,
	Reuben Farrelly <reuben-linuxkernel@...b.net>,
	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 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:

- 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
> :wq!
> -
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-- 
Gautham R Shenoy
Linux Technology Center
IBM India.
"Freedom comes with a price tag of responsibility, which is still a bargain,
because Freedom is priceless!"
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