linux-kernel - Re: [PATCH] cpufreq/intel_pstate: Add kernel command line option disable intel

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Message-ID: <CAE9FiQWSoXafuzkpegZ_DV9GA23YtTVgXMjzkqqpQWEDOXqJaA@mail.gmail.com>
Date:	Thu, 14 Feb 2013 14:56:23 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	dirk.brandewie@...il.com
Cc:	rjw@...k.pl, linux-kernel@...r.kernel.org, cpufreq@...r.kernel.org,
	Dirk Brandewie <dirk.j.brandewie@...el.com>
Subject: Re: [PATCH] cpufreq/intel_pstate: Add kernel command line option
 disable intel_pstate.

On Thu, Feb 14, 2013 at 10:38 AM,  <dirk.brandewie@...il.com> wrote:
> From: Dirk Brandewie <dirk.brandewie@...il.com>
>
> When intel_pstate is configured into the kernel it will become the
> perferred scaling driver for processors that is supports.  Allow the
> user to override this by adding:
>    intel_pstate=disable
> on the kernel command line.
>
> Signed-off-by: Dirk Brandewie <dirk.j.brandewie@...el.com>
> ---
>  Documentation/kernel-parameters.txt |    5 +++++
>  drivers/cpufreq/intel_pstate.c      |   16 ++++++++++++++++
>  2 files changed, 21 insertions(+), 0 deletions(-)
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 6c72381..41c5d9e 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1131,6 +1131,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>                         0       disables intel_idle and fall back on acpi_idle.
>                         1 to 6  specify maximum depth of C-state.
>
> +       intel_pstate=  [X86]
> +                      disable
> +                        Do not enable intel_pstate as the default
> +                        scaling driver for the supported processors
> +
>         intremap=       [X86-64, Intel-IOMMU]
>                         on      enable Interrupt Remapping (default)
>                         off     disable Interrupt Remapping
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index e879963..9cbb733 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -773,11 +773,16 @@ static void intel_pstate_exit(void)
>  }
>  module_exit(intel_pstate_exit);
>
> +static int no_load;

Looks like you can use __initdata with it.

Thanks

Yinghai


> +
>  static int __init intel_pstate_init(void)
>  {
>         int rc = 0;
>         const struct x86_cpu_id *id;
>
> +       if (no_load)
> +               return -ENODEV;
> +
>         id = x86_match_cpu(intel_pstate_cpu_ids);
>         if (!id)
>                 return -ENODEV;
> @@ -802,6 +807,17 @@ out:
>  }
>  device_initcall(intel_pstate_init);
>
> +static int __init intel_pstate_setup(char *str)
> +{
> +       if (!str)
> +               return -EINVAL;
> +
> +       if (!strcmp(str, "disable"))
> +               no_load = 1;
> +       return 0;
> +}
> +early_param("intel_pstate", intel_pstate_setup);
> +
>  MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@...el.com>");
>  MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
>  MODULE_LICENSE("GPL");
> --
> 1.7.7.6
>
> --
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