linux-kernel - Re: [PATCH] cpufreq: kryo: allow building as a loadable module

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Date:   Wed, 06 Jun 2018 07:44:39 +0300
From:   Ilia Lin <ilialin@...eaurora.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Arnd Bergmann <arnd@...db.de>
CC:     "Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: kryo: allow building as a loadable module

Viresh got ahead of my answer a bit. :)
Sure I'll post the module exit later.

On June 6, 2018 7:09:29 AM GMT+03:00, Viresh Kumar <viresh.kumar@...aro.org> wrote:
>On 05-06-18, 13:44, Arnd Bergmann wrote:
>> Building the kryo cpufreq driver while QCOM_SMEM is a loadable module
>> results in a link error:
>> 
>> drivers/cpufreq/qcom-cpufreq-kryo.o: In function
>`qcom_cpufreq_kryo_probe':
>> qcom-cpufreq-kryo.c:(.text+0xbc): undefined reference to
>`qcom_smem_get'
>> 
>> The problem is that Kconfig ignores interprets the dependency as met
>> when the dependent symbol is a 'bool' one. By making it 'tristate',
>> it will be forced to be a module here, which builds successfully.
>> 
>> Fixes: 46e2856b8e18 ("cpufreq: Add Kryo CPU scaling driver")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> ---
>>  drivers/cpufreq/Kconfig.arm | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/drivers/cpufreq/Kconfig.arm
>b/drivers/cpufreq/Kconfig.arm
>> index c7ce928fbf1f..52f5f1a2040c 100644
>> --- a/drivers/cpufreq/Kconfig.arm
>> +++ b/drivers/cpufreq/Kconfig.arm
>> @@ -125,7 +125,7 @@ config ARM_OMAP2PLUS_CPUFREQ
>>  	default ARCH_OMAP2PLUS
>>  
>>  config ARM_QCOM_CPUFREQ_KRYO
>> -	bool "Qualcomm Kryo based CPUFreq"
>> +	tristate "Qualcomm Kryo based CPUFreq"
>>  	depends on ARM64
>>  	depends on QCOM_QFPROM
>>  	depends on QCOM_SMEM
>
>Okay, so we really need this to be a module. But the driver can't
>really work as
>a module right now if we do this: insmod, rmmod, insmod. Because it
>doesn't free
>resources at rmmmod and will fail on second insmod.
>
>Because what you are fixing is a critical build error, we better get it
>merged
>right now.
>
>Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
>
>But Ilia needs to cook another patch to add the module removal code for
>the
>driver and mark your patch's commit id in the fixes tag.

-- 
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