linux-kernel - Re: [PATCH] clk: mmp2: fix build without CONFIG

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Date:   Tue, 5 Jan 2021 13:17:32 +0100
From:   Lubomir Rintel <lkundrak@...sk>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: mmp2: fix build without CONFIG_PM

On Sun, Jan 03, 2021 at 02:54:53PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> pm_clk_suspend()/pm_clk_resume() are defined as NULL pointers rather than
> empty inline stubs without CONFIG_PM:
> 
> drivers/clk/mmp/clk-audio.c:402:16: error: called object type 'void *' is not a function or function pointer
>         pm_clk_suspend(dev);
> drivers/clk/mmp/clk-audio.c:411:15: error: called object type 'void *' is not a function or function pointer
>         pm_clk_resume(dev);
> 
> I tried redefining the helper functions, but that caused additional
> problems. This is the simple solution of replacing the __maybe_unused
> trick with an #ifdef.
> 
> Fixes: 725262d29139 ("clk: mmp2: Add audio clock controller driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thank you.

Acked-By: Lubomir Rintel <lkundrak@...sk>

> ---
>  drivers/clk/mmp/clk-audio.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/mmp/clk-audio.c b/drivers/clk/mmp/clk-audio.c
> index eea69d498bd2..7aa7f4a9564f 100644
> --- a/drivers/clk/mmp/clk-audio.c
> +++ b/drivers/clk/mmp/clk-audio.c
> @@ -392,7 +392,8 @@ static int mmp2_audio_clk_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static int __maybe_unused mmp2_audio_clk_suspend(struct device *dev)
> +#ifdef CONFIG_PM
> +static int mmp2_audio_clk_suspend(struct device *dev)
>  {
>  	struct mmp2_audio_clk *priv = dev_get_drvdata(dev);
>  
> @@ -404,7 +405,7 @@ static int __maybe_unused mmp2_audio_clk_suspend(struct device *dev)
>  	return 0;
>  }
>  
> -static int __maybe_unused mmp2_audio_clk_resume(struct device *dev)
> +static int mmp2_audio_clk_resume(struct device *dev)
>  {
>  	struct mmp2_audio_clk *priv = dev_get_drvdata(dev);
>  
> @@ -415,6 +416,7 @@ static int __maybe_unused mmp2_audio_clk_resume(struct device *dev)
>  
>  	return 0;
>  }
> +#endif
>  
>  static const struct dev_pm_ops mmp2_audio_clk_pm_ops = {
>  	SET_RUNTIME_PM_OPS(mmp2_audio_clk_suspend, mmp2_audio_clk_resume, NULL)
> -- 
> 2.29.2
>