Re: [PATCH] cpuidle: governor: export cpuidle governor functions

[Lina Iyer <ilina@codeaurora.org>]

Hi Rafael,

On Tue, Sep 22 2020 at 10:00 -0600, Rafael J. Wysocki wrote:
>Sorry for the delay.
>
>On Wed, Sep 9, 2020 at 12:15 AM Lina Iyer <ilina@codeaurora.org> wrote:
>>
>> Commit 83788c0caed3 ("cpuidle: remove unused exports") removed
>> capability of registering cpuidle governors, which was unused at that
>> time. By exporting the symbol, let's allow platform specific modules to
>> register cpuidle governors and use cpuidle_governor_latency_req() to get
>> the QoS for the CPU.
>
>Which platform-specific modules may want to do that and why?
>
We are planning a custom cpuidle governor for QCOM SoCs. With Android,
the idea is to make them loadable modules so they can be in a separate
partition.

Thanks,
Lina

>> Signed-off-by: Lina Iyer <ilina@codeaurora.org>
>> ---
>>  drivers/cpuidle/governor.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/cpuidle/governor.c b/drivers/cpuidle/governor.c
>> index 29acaf48e575..0e51ed25665e 100644
>> --- a/drivers/cpuidle/governor.c
>> +++ b/drivers/cpuidle/governor.c
>> @@ -102,6 +102,7 @@ int cpuidle_register_governor(struct cpuidle_governor *gov)
>>
>>         return ret;
>>  }
>> +EXPORT_SYMBOL_GPL(cpuidle_register_governor);
>>
>>  /**
>>   * cpuidle_governor_latency_req - Compute a latency constraint for CPU
>> @@ -118,3 +119,4 @@ s64 cpuidle_governor_latency_req(unsigned int cpu)
>>
>>         return (s64)device_req * NSEC_PER_USEC;
>>  }
>> +EXPORT_SYMBOL_GPL(cpuidle_governor_latency_req);
>> --
>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
>> a Linux Foundation Collaborative Project
>>