linux-kernel - Re: [PATCH] PM: Add EXPORT macros for exporting PM functions

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Date:   Mon, 13 Feb 2023 15:50:01 +0000
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
CC:     <pavel@....cz>, <len.brown@...el.com>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>
Subject: Re: [PATCH] PM: Add EXPORT macros for exporting PM functions

On 13/02/2023 15:43, Rafael J. Wysocki wrote:
> On Mon, Feb 13, 2023 at 2:20 PM Richard Fitzgerald
> <rf@...nsource.cirrus.com> wrote:
>>
>> Add a set of macros for exporting functions only if CONFIG_PM
>> is enabled.
>>
>> The naming follows the style of the standard EXPORT_SYMBOL_*()
>> macros that they replace.
>>
>> Sometimes a module wants to export PM functions directly to other
>> drivers, not a complete struct dev_pm_ops. A typical example is
>> where a core library exports the generic (shared) implementation
>> and calling code wraps one or more of these in custom code.
>>
>> Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
>> ---
>>   include/linux/pm.h | 8 ++++++++
>>   1 file changed, 8 insertions(+)
>>
>> diff --git a/include/linux/pm.h b/include/linux/pm.h
>> index 93cd34f00822..21618f7087f8 100644
>> --- a/include/linux/pm.h
>> +++ b/include/linux/pm.h
>> @@ -379,9 +379,17 @@ const struct dev_pm_ops name = { \
>>          const struct dev_pm_ops name;                                   \
>>          __EXPORT_SYMBOL(name, sec, ns);                                 \
>>          const struct dev_pm_ops name
>> +#define EXPORT_PM_FN(name)             EXPORT_SYMBOL(name)
>> +#define EXPORT_PM_FN_GPL(name)         EXPORT_SYMBOL_GPL(name)
>> +#define EXPORT_PM_FN_NS(name, ns)      EXPORT_SYMBOL_NS(name, ns)
>> +#define EXPORT_PM_FN_NS_GPL(name, ns)  EXPORT_SYMBOL_NS_GPL(name, ns)
> 
> Why are the non-GPL variants needed?
>

I did all four because there are all four variants of EXPORT_DEV_PM_OPS.
Why are the non-GPL variants of EXPORT_DEV_PM_OPS needed?

I can remove the non-GPL variants of my macros.

>>   #else
>>   #define _EXPORT_DEV_PM_OPS(name, sec, ns)                              \
>>          static __maybe_unused const struct dev_pm_ops __static_##name
>> +#define EXPORT_PM_FN(name)
>> +#define EXPORT_PM_FN_GPL(name)
>> +#define EXPORT_PM_FN_NS(name, ns)
>> +#define EXPORT_PM_FN_NS_GPL(name, ns)
>>   #endif
>>
>>   #define EXPORT_DEV_PM_OPS(name) _EXPORT_DEV_PM_OPS(name, "", "")
>> --
>> 2.30.2
>>