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Date:	Fri, 28 Dec 2012 18:53:20 -0600
From:	Larry Finger <>
To:	Fabio Baltieri <>,
	"Rafael J. Wysocki" <>,
	viresh kumar <>,, Linux PM list <>,
	LKML <>
Subject: Re: [PATCH] Fix problem with cpufreq_pndemand or cpufreq_conservative

On 12/28/2012 06:33 PM, Fabio Baltieri wrote:
> On Fri, Dec 28, 2012 at 05:45:54PM -0600, Larry Finger wrote:
>>> I wonder if that's avoidable?  The intention is not to create an additional
>>> module, clearly.
>> It appears not to be possible. I don't know enough about to kmake to
>> understand why it is forcing a new module. Perhaps some expert knows
>> what Kconfig or Makefile magic will prevent that.
> kbuild is building an additional module just because the makefile is
> adding the new objects in the obj-m list directly, as in:
> obj-$(CONFIG_CPU_FREQ_GOV_ONDEMAND)     += cpufreq_ondemand.o cpufreq_governor.o
> obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE) += cpufreq_conservative.o cpufreq_governor.o
> To build just two modules the Makefile would have to be modified [1]
> into something into something like:
> obj-$(CONFIG_CPU_FREQ_GOV_ONDEMAND)     += cpufreq_ondemand_mod.o
> cpufreq_ondemand_mod-y                  := cpufreq_ondemand.o cpufreq_governor.o
> obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE) += cpufreq_conservative_mod.o
> cpufreq_conservative_mod-y              := cpufreq_conservative.o cpufreq_governor.o
> so that only two .o are added to obj-m, but that's not correct either as
> you end up with cpufreq_governor symbols exported twice.
> I think the only way would be to force cpufreq_governor as builtin with
> an automatic Kconfig option.
> Fabio
> 1.


Thanks for the explanation. Now I think I know how to do it.

V3 follows.


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