linux-kernel - Re: [PATCH 2/3] intel_pstate: allow driver to be built as a module

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Date:	Wed, 19 Nov 2014 10:58:31 -0800
From:	Kristen Carlson Accardi <kristen@...ux.intel.com>
To:	Ethan Zhao <ethan.zhao@...cle.com>
Cc:	<dirk.j.brandewie@...el.com>, <viresh.kumar@...aro.org>,
	<rjw@...ysocki.net>, <corbet@....net>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<ethan.kernel@...il.com>, <joe.jin@...cle.com>,
	<brian.maly@...cle.com>
Subject: Re: [PATCH 2/3] intel_pstate: allow driver to be built as a module

On Tue, 18 Nov 2014 17:37:05 +0900
Ethan Zhao <ethan.zhao@...cle.com> wrote:

> From: Brian Maly <brian.maly@...cle.com>
> 
> To provide the flexibility of module, allow this driver to
> be configured and built as a module.
> 
> Signed-off-by: Brian Maly <brian.maly@...cle.com>
> Signed-off-by: Ethan Zhao <ethan.zhao@...cle.com>

I believe the entire concept of being able to use intel_pstate as a
module just isn't going to work.  There are load order issues - and
additionally the driver doesn't clean up after itself in any way.


> ---
>  drivers/cpufreq/Kconfig.x86    | 2 +-
>  drivers/cpufreq/intel_pstate.c | 6 ++++++
>  2 files changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86
> index 89ae88f..94c9e6b 100644
> --- a/drivers/cpufreq/Kconfig.x86
> +++ b/drivers/cpufreq/Kconfig.x86
> @@ -3,7 +3,7 @@
>  #
>  
>  config X86_INTEL_PSTATE
> -       bool "Intel P state control"
> +       tristate "Intel P state control"
>         depends on X86
>         help
>            This driver provides a P state for Intel core processors.
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index 5498eb0..7c5faea 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -590,7 +590,9 @@ static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
>  	if (pstate == cpu->pstate.current_pstate)
>  		return;
>  
> +#ifndef MODULE
>  	trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
> +#endif
>  
>  	cpu->pstate.current_pstate = pstate;
>  
> @@ -705,12 +707,14 @@ static void intel_pstate_timer_func(unsigned long __data)
>  
>  	intel_pstate_adjust_busy_pstate(cpu);
>  
> +#ifndef MODULE
>  	trace_pstate_sample(fp_toint(sample->core_pct_busy),
>  			fp_toint(intel_pstate_get_scaled_busy(cpu)),
>  			cpu->pstate.current_pstate,
>  			sample->mperf,
>  			sample->aperf,
>  			sample->freq);
> +#endif
>  
>  	intel_pstate_set_sample_time(cpu);
>  }
> @@ -1054,6 +1058,7 @@ out:
>  }
>  device_initcall(intel_pstate_init);
>  
> +#ifndef MODULE
>  static int __init intel_pstate_setup(char *str)
>  {
>  	if (!str)
> @@ -1064,6 +1069,7 @@ static int __init intel_pstate_setup(char *str)
>  	return 0;
>  }
>  early_param("intel_pstate", intel_pstate_setup);
> +#endif
>  
>  MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@...el.com>");
>  MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");

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