linux-kernel - Re: [PATCH] ALSA: hda_intel: mark PM functions as __maybe

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Date:   Thu, 29 Mar 2018 00:14:03 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Guneshwor Singh <guneshwor.o.singh@...el.com>,
        Vijendar Mukunda <Vijendar.Mukunda@....com>,
        Libin Yang <libin.yang@...el.com>, alsa-devel@...a-project.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ALSA: hda_intel: mark PM functions as __maybe_unused

On Wed, Mar 28, 2018 at 4:31 PM, Lukas Wunner <lukas@...ner.de> wrote:
> On Wed, Mar 28, 2018 at 04:19:29PM +0200, Arnd Bergmann wrote:
>> Two callsites of azx_suspend/azx_resume were removed, leaving these
>> functions only called from the optional SET_SYSTEM_SLEEP_PM_OPS()
>> and causing a warning without CONFIG_PM_SLEEP:
>>
>> sound/pci/hda/hda_intel.c:1029:12: error: 'azx_resume' defined but not used [-Werror=unused-function]
>>  static int azx_resume(struct device *dev)
>>             ^~~~~~~~~~
>> sound/pci/hda/hda_intel.c:994:12: error: 'azx_suspend' defined but not used [-Werror=unused-function]
>>  static int azx_suspend(struct device *dev)
>>             ^~~~~~~~~~~
>>
>> Keeping track of the correct #ifdef checks is hard, so this removes
>> all the #ifdefs for power management in this file and instead uses
>> __maybe_unused annotations that let the compiler do the job right
>> by itself.
>
> Ugh, this isn't as hard as it may seem, just replace
>
>         #if defined(CONFIG_PM_SLEEP) || defined(SUPPORT_VGA_SWITCHEROO)
>
> with
>
>         #if defined(CONFIG_PM_SLEEP)
>
> That way it's just a simple one line change which is less intrusive.
>
> Care to respin like this?

I won't be able to test that properly before the merge window. If you
are sure that works, maybe you can send that patch and just mark
it as 'Reported-by: Arnd Bergmann <arnd@...db.de>'?

I've mostly stopped trying to figure out what the correct set of #ifdef
for power management functions is, since I get those wrong as much
as everyone else. ;-). The patch I sent has been through a few days
of randconfig testing.

      Arnd