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

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Message-Id: <7CC53F0F-7B2A-4915-8DC8-A2A5DC7C6930@gmail.com>
Date:	Thu, 20 Nov 2014 09:01:27 +0800
From:	ethan <ethan.kernel@...il.com>
To:	Kristen Carlson Accardi <kristen@...ux.intel.com>
Cc:	Ethan Zhao <ethan.zhao@...cle.com>,
	"<dirk.j.brandewie@...el.com>" <dirk.j.brandewie@...el.com>,
	"<viresh.kumar@...aro.org>" <viresh.kumar@...aro.org>,
	"<rjw@...ysocki.net>" <rjw@...ysocki.net>,
	"<corbet@....net>" <corbet@....net>,
	"<linux-doc@...r.kernel.org>" <linux-doc@...r.kernel.org>,
	"<linux-kernel@...r.kernel.org>" <linux-kernel@...r.kernel.org>,
	"<linux-pm@...r.kernel.org>" <linux-pm@...r.kernel.org>,
	"<joe.jin@...cle.com>" <joe.jin@...cle.com>,
	"<brian.maly@...cle.com>" <brian.maly@...cle.com>
Subject: Re: [PATCH 2/3] intel_pstate: allow driver to be built as a module

Kristen,
> 在 2014年11月20日，02:58，Kristen Carlson Accardi <kristen@...ux.intel.com> 写道：
> 
> 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.
> 
Roger.

Thanks,
Ethan
>> ---
>> 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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