linux-kernel - Re: [PATCH V3] Fix problem with cpufreq_ondemand or cpufreq

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Date:	Sat, 29 Dec 2012 09:39:16 -0600
From:	Larry Finger <Larry.Finger@...inger.net>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	fabio.baltieri@...aro.org, viresh.kumar@...aro.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH V3] Fix problem with cpufreq_ondemand or cpufreq_conservative

On 12/29/2012 07:27 AM, Rafael J. Wysocki wrote:
> On Friday, December 28, 2012 07:55:20 PM Larry Finger wrote:
>> Since commit 2aacdff entitled "cpufreq: Move common part from governors
>> to separate file", whenever the drivers that depend on this new file
>> (cpufreq_ondemand or cpufreq_conservative) are built as modules, a new
>> module named cpufreq_governor is created because the Makefile includes
>> cpufreq_governor.o twice. As drivers/cpufreq/cpufreq_governor.c contains no
>> MODULE directives, the resulting module has no license specified, which
>> results in logging of a "module license 'unspecified' taints kernel". In
>> addition, a number of globals are exported GPL only, and are therefore
>> not available. This fix establishes a new boolean configuration variable
>> that forces cpufreq_governor.o to be linked into the kernel whenever
>> either cpufreq_ondemand or cpufreq_conservative is selected.
>>
>> Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
>> ---
>> V3 changes only Kconfig and Makefile and avoids creating a new module.
>
> OK, thanks for the patch!
>
> If you don't mind, I'll rename CONFIG_CPU_FREQ_GOVERNOR to
> CONFIG_CPU_FREQ_GOV_COMMON when applying it, though.

No problem. It occurred to me that if one can do logic in a Makefile, then the 
extra configuration variable can be eliminated. I still need to check if that is 
possible.

Larry

>
> Thanks,
> Rafael
>
>
>>   Kconfig  |    5 +++++
>>   Makefile |    5 +++--
>>   2 files changed, 8 insertions(+), 2 deletions(-)
>>
>> Index: wireless-testing-new/drivers/cpufreq/Kconfig
>> ===================================================================
>> --- wireless-testing-new.orig/drivers/cpufreq/Kconfig
>> +++ wireless-testing-new/drivers/cpufreq/Kconfig
>> @@ -20,6 +20,9 @@ if CPU_FREQ
>>   config CPU_FREQ_TABLE
>>   	tristate
>>
>> +config CPU_FREQ_GOVERNOR
>> +	bool
>> +
>>   config CPU_FREQ_STAT
>>   	tristate "CPU frequency translation statistics"
>>   	select CPU_FREQ_TABLE
>> @@ -141,6 +144,7 @@ config CPU_FREQ_GOV_USERSPACE
>>   config CPU_FREQ_GOV_ONDEMAND
>>   	tristate "'ondemand' cpufreq policy governor"
>>   	select CPU_FREQ_TABLE
>> +	select CPU_FREQ_GOVERNOR
>>   	help
>>   	  'ondemand' - This driver adds a dynamic cpufreq policy governor.
>>   	  The governor does a periodic polling and
>> @@ -159,6 +163,7 @@ config CPU_FREQ_GOV_ONDEMAND
>>   config CPU_FREQ_GOV_CONSERVATIVE
>>   	tristate "'conservative' cpufreq governor"
>>   	depends on CPU_FREQ
>> +	select CPU_FREQ_GOVERNOR
>>   	help
>>   	  'conservative' - this driver is rather similar to the 'ondemand'
>>   	  governor both in its source code and its purpose, the difference is
>> Index: wireless-testing-new/drivers/cpufreq/Makefile
>> ===================================================================
>> --- wireless-testing-new.orig/drivers/cpufreq/Makefile
>> +++ wireless-testing-new/drivers/cpufreq/Makefile
>> @@ -7,8 +7,9 @@ obj-$(CONFIG_CPU_FREQ_STAT)
>>   obj-$(CONFIG_CPU_FREQ_GOV_PERFORMANCE)	+= cpufreq_performance.o
>>   obj-$(CONFIG_CPU_FREQ_GOV_POWERSAVE)	+= cpufreq_powersave.o
>>   obj-$(CONFIG_CPU_FREQ_GOV_USERSPACE)	+= cpufreq_userspace.o
>> -obj-$(CONFIG_CPU_FREQ_GOV_ONDEMAND)	+= cpufreq_ondemand.o cpufreq_governor.o
>> -obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE)	+= cpufreq_conservative.o cpufreq_governor.o
>> +obj-$(CONFIG_CPU_FREQ_GOV_ONDEMAND)	+= cpufreq_ondemand.o
>> +obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE)	+= cpufreq_conservative.o
>> +obj-$(CONFIG_CPU_FREQ_GOVERNOR)		+= cpufreq_governor.o
>>
>>   # CPUfreq cross-arch helpers
>>   obj-$(CONFIG_CPU_FREQ_TABLE)		+= freq_table.o

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