linux-kernel - Re: [PATCH] ALSA: x86: mark hdmi suspend/resume functions as __maybe

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Message-ID: <14768fe7-9b3a-ed4d-0c15-6ddae07f6cba@sakamocchi.jp>
Date:   Tue, 7 Feb 2017 23:19:47 +0900
From:   Takashi Sakamoto <o-takashi@...amocchi.jp>
To:     Arnd Bergmann <arnd@...db.de>, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>
Cc:     linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Jerome Anand <jerome.anand@...el.com>
Subject: Re: [PATCH] ALSA: x86: mark hdmi suspend/resume functions as
 __maybe_unused

Hi,

On Feb 7 2016 22:38, Arnd Bergmann wrote:
> The two functions are unused when CONFIG_PM_SLEEP is disabled:
>
> sound/x86/intel_hdmi_audio.c:1633:12: error: 'hdmi_lpe_audio_resume' defined but not used [-Werror=unused-function]
> sound/x86/intel_hdmi_audio.c:1622:12: error: 'hdmi_lpe_audio_suspend' defined but not used [-Werror=unused-function]
>
> Marking them as __maybe_unused avoids the warning without introducing an
> ugly #ifdef.
>
> Fixes: 182cdf23dbf6 ("ALSA: x86: Implement runtime PM")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  sound/x86/intel_hdmi_audio.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/sound/x86/intel_hdmi_audio.c b/sound/x86/intel_hdmi_audio.c
> index 8978dc9bf579..0d19a4994bac 100644
> --- a/sound/x86/intel_hdmi_audio.c
> +++ b/sound/x86/intel_hdmi_audio.c
> @@ -1619,7 +1619,7 @@ static int hdmi_lpe_audio_runtime_suspend(struct device *dev)
>  	return 0;
>  }
>
> -static int hdmi_lpe_audio_suspend(struct device *dev)
> +static int __maybe_unused hdmi_lpe_audio_suspend(struct device *dev)
>  {
>  	struct snd_intelhad *ctx = dev_get_drvdata(dev);
>  	int err;
> @@ -1630,7 +1630,7 @@ static int hdmi_lpe_audio_suspend(struct device *dev)
>  	return err;
>  }
>
> -static int hdmi_lpe_audio_resume(struct device *dev)
> +static int __maybe_unused hdmi_lpe_audio_resume(struct device *dev)
>  {
>  	struct snd_intelhad *ctx = dev_get_drvdata(dev);

In this case, in this subsystem, we can see codes to pre-process the 
function calls to NULL and the function definition is omitted. This is a 
sample:
https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/sound/pci/hda/patch_sigmatel.c#n4427

Let us apply the same idea to this module?


Thanks

Takashi Sakamoto