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

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Date:	Sat, 29 Dec 2012 14:27:14 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Larry Finger <Larry.Finger@...inger.net>
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 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.

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
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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