linux-kernel - Re: [PATCH] devfreq: tegra20: add COMMON

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Date:   Fri, 28 Jun 2019 14:05:48 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Arnd Bergmann <arnd@...db.de>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>
Cc:     Chanwoo Choi <cw00.choi@...sung.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] devfreq: tegra20: add COMMON_CLK dependency

28.06.2019 14:00, Dmitry Osipenko пишет:
> 28.06.2019 13:32, Arnd Bergmann пишет:
>> Compile-testing the new driver on platforms without CONFIG_COMMON_CLK
>> leads to a link error:
>>
>> drivers/devfreq/tegra20-devfreq.o: In function `tegra_devfreq_target':
>> tegra20-devfreq.c:(.text+0x288): undefined reference to `clk_set_min_rate'
>>
>> Add a dependency on COMMON_CLK to avoid this.
>>
>> Fixes: 1d39ee8dad6d ("PM / devfreq: Introduce driver for NVIDIA Tegra20")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> ---
>>  drivers/devfreq/Kconfig | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig
>> index f3b242987fd9..defe1d438710 100644
>> --- a/drivers/devfreq/Kconfig
>> +++ b/drivers/devfreq/Kconfig
>> @@ -107,6 +107,7 @@ config ARM_TEGRA_DEVFREQ
>>  config ARM_TEGRA20_DEVFREQ
>>  	tristate "NVIDIA Tegra20 DEVFREQ Driver"
>>  	depends on (TEGRA_MC && TEGRA20_EMC) || COMPILE_TEST
>> +	depends on COMMON_CLK
>>  	select DEVFREQ_GOV_SIMPLE_ONDEMAND
>>  	select PM_OPP
>>  	help
>>
> 
> How is it possible to happen? There is a stub for clk_set_min_rate() when COMMON_CLK
> is disabled .. Could you please show the kernel's config that causes the problem?
> 
> Moreover that was me who added the missing stub for clk_set_min_rate() in [1] to fix [2].
> 
> [1]
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/include/linux/clk.h?id=b88c9f4129dcec941e5a26508e991c08051ed1ac
> 
> [2] https://lists.01.org/pipermail/kbuild-all/2019-April/060292.html
> 
> So this patch looks wrong to me because apparently it fixes a non-existent problem.
> 

Oh, wait. That was "implicit declaration" and this one is "undefined reference"!
Still looks like something else need to be fixed..