linux-kernel - Re: [PATCH] [v2] clk: samsung: mark PM functions as __maybe

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Date:   Fri, 4 Dec 2020 18:45:35 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-samsung-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] clk: samsung: mark PM functions as __maybe_unused

On 12/4/20 6:16 PM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The use of SIMPLE_DEV_PM_OPS() means that the suspend/resume
> functions are now unused when CONFIG_PM is disabled:
> 
> drivers/clk/samsung/clk-exynos-clkout.c:219:12: error: 'exynos_clkout_resume' defined but not used [-Werror=unused-function]
>   219 | static int exynos_clkout_resume(struct device *dev)
>       |            ^~~~~~~~~~~~~~~~~~~~
> drivers/clk/samsung/clk-exynos-clkout.c:210:12: error: 'exynos_clkout_suspend' defined but not used [-Werror=unused-function]
>   210 | static int exynos_clkout_suspend(struct device *dev)
>       |            ^~~~~~~~~~~~~~~~~~~~~
> 
> Mark them as __maybe_unused to shut up the otherwise harmless warning.
> 
> Fixes: 9484f2cb8332 ("clk: samsung: exynos-clkout: convert to module driver")
> Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> v2: add proper changelog text
> ---
>  drivers/clk/samsung/clk-exynos-clkout.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/samsung/clk-exynos-clkout.c b/drivers/clk/samsung/clk-exynos-clkout.c
> index 9ec2f40cc400..e6d6cbf8c4e6 100644
> --- a/drivers/clk/samsung/clk-exynos-clkout.c
> +++ b/drivers/clk/samsung/clk-exynos-clkout.c
> @@ -207,7 +207,7 @@ static int exynos_clkout_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static int exynos_clkout_suspend(struct device *dev)
> +static int __maybe_unused exynos_clkout_suspend(struct device *dev)
>  {
>  	struct exynos_clkout *clkout = dev_get_drvdata(dev);
>  
> @@ -216,7 +216,7 @@ static int exynos_clkout_suspend(struct device *dev)
>  	return 0;
>  }
>  
> -static int exynos_clkout_resume(struct device *dev)
> +static int __maybe_unused exynos_clkout_resume(struct device *dev)
>  {
>  	struct exynos_clkout *clkout = dev_get_drvdata(dev);
>  
> 

Acked-by: Chanwoo Choi <cw00.choi@...sung.com>

Best Regards,
Chanwoo Choi
Samsung Electronics