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

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Date:   Wed, 28 Mar 2018 16:31:50 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     Arnd Bergmann <arnd@...db.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@...r.kernel.org
Subject: Re: [PATCH] ALSA: hda_intel: mark PM functions as __maybe_unused

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?

Thanks for the report,

Lukas