linux-kernel - Re: [PATCH v2 1/3] PM: introduce pm

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Message-Id: <4JNE9Q.Y5HBZ952XKLI@crapouillou.net>
Date:   Sun, 26 Apr 2020 19:06:40 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>, Pavel Machek <pavel@....cz>,
        Len Brown <len.brown@...el.com>, od@...c.me,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 1/3] PM: introduce pm_ptr() macro

Hi Rafael,

Le dim. 26 avril 2020 à 17:40, Rafael J. Wysocki <rjw@...ysocki.net> a 
écrit :
> On Monday, April 13, 2020 2:32:05 PM CEST Paul Cercueil wrote:
>>  This macro is analogous to the infamous of_match_ptr(). If CONFIG_PM
>>  is enabled, this macro will resolve to its argument, otherwise to 
>> NULL.
> 
> Well, this is going to result in quite a bit of unused code being
> added to the kernels built with CONFIG_PM unset.
> 
> Is there any way to avoid that somehow?

Using __maybe_unused on the dev_pm_ops struct and the callbacks, as 
long as they are static, they should be dropped by the compiler when 
CONFIG_PM is not set.

-Paul

> 
>>  Signed-off-by: Paul Cercueil <paul@...pouillou.net>
>>  ---
>> 
>>  Notes:
>>      v2: Remove pm_sleep_ptr() macro
>> 
>>   include/linux/pm.h | 6 ++++++
>>   1 file changed, 6 insertions(+)
>> 
>>  diff --git a/include/linux/pm.h b/include/linux/pm.h
>>  index e057d1fa2469..1c0eec06905d 100644
>>  --- a/include/linux/pm.h
>>  +++ b/include/linux/pm.h
>>  @@ -374,6 +374,12 @@ const struct dev_pm_ops name = { \
>>   	SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
>>   }
>> 
>>  +#ifdef CONFIG_PM
>>  +#define pm_ptr(_ptr) (_ptr)
>>  +#else
>>  +#define pm_ptr(_ptr) NULL
>>  +#endif
>>  +
>>   /*
>>    * PM_EVENT_ messages
>>    *
>> 
> 
> 
> 
>