linux-kernel - Re: cpufreq: mediatek: allow modular build

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Date:	Fri, 11 Sep 2015 13:47:53 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Pi-Cheng Chen <pi-cheng.chen@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: cpufreq: mediatek: allow modular build

On 11-09-15, 10:15, Arnd Bergmann wrote:
> The newly merged cpufreq-mt8173 driver breaks the ARM allmodconfig
> build because of a dependency on the cpu-cooling infrastructure that
> may be built as a loadable module:
> 
> drivers/built-in.o: In function `mtk_cpufreq_ready':
> binder.c:(.text+0x324c8c): undefined reference to `of_cpufreq_cooling_register'
> drivers/built-in.o: In function `mtk_cpufreq_exit':
> binder.c:(.text+0x324ea0): undefined reference to `cpufreq_cooling_unregister'
> 
> This works around the issue by allowing this driver to be built
> as a module as well, and adding a dependency on THERMAL that prevents
> it from being built-in when the cpu-cooling driver is a module.
> 
> This is not perfect because there is still a case where THERMAL=m
> and CPU_COOLING=n that should allow us to have this driver built-in
> as well, but I decided to follow existing practice in other drivers
> here, and that case seems irrelevant in practice.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> I have not checked if someone else has already sent a patch for this,
> just ignore mine if the issue has been fixed already.

5269e7067cd6 ("cpufreq: Add ARM_MT8173_CPUFREQ dependency on THERMAL")

in Rafael's tree. Its a bit different, so have a look.
-- 
viresh
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