linux-kernel - Re: [PATCH -next] media: marvell-ccic: Fix -Wunused-function warnings

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Date:   Thu, 10 Sep 2020 10:22:21 +0200
From:   Lubomir Rintel <lkundrak@...sk>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     corbet@....net, mchehab@...nel.org, hverkuil-cisco@...all.nl,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] media: marvell-ccic: Fix -Wunused-function warnings

On Thu, Sep 10, 2020 at 04:09:33PM +0800, YueHaibing wrote:
> If CONFIG_PM is n, gcc warns:
> 
> drivers/media/platform/marvell-ccic/mmp-driver.c:347:12: warning: ‘mmpcam_resume’ defined but not used [-Wunused-function]
>  static int mmpcam_resume(struct device *dev)
>             ^~~~~~~~~~~~~
> drivers/media/platform/marvell-ccic/mmp-driver.c:338:12: warning: ‘mmpcam_suspend’ defined but not used [-Wunused-function]
>  static int mmpcam_suspend(struct device *dev)
>             ^~~~~~~~~~~~~~
> drivers/media/platform/marvell-ccic/mmp-driver.c:324:12: warning: ‘mmpcam_runtime_suspend’ defined but not used [-Wunused-function]
>  static int mmpcam_runtime_suspend(struct device *dev)
>             ^~~~~~~~~~~~~~~~~~~~~~
> drivers/media/platform/marvell-ccic/mmp-driver.c:310:12: warning: ‘mmpcam_runtime_resume’ defined but not used [-Wunused-function]
>  static int mmpcam_runtime_resume(struct device *dev)
>             ^~~~~~~~~~~~~~~~~~~~~
> 
> Mark them as __maybe_unused to fix this.
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>

Your colleague seems to sent out an equivalent patch:
https://lore.kernel.org/lkml/20200910080933.40684-1-yuehaibing@huawei.com/

Cheers
Lubo

> ---
>  drivers/media/platform/marvell-ccic/mmp-driver.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/platform/marvell-ccic/mmp-driver.c b/drivers/media/platform/marvell-ccic/mmp-driver.c
> index c4b28a00a3a2..032fdddbbecc 100644
> --- a/drivers/media/platform/marvell-ccic/mmp-driver.c
> +++ b/drivers/media/platform/marvell-ccic/mmp-driver.c
> @@ -307,7 +307,7 @@ static int mmpcam_platform_remove(struct platform_device *pdev)
>   * Suspend/resume support.
>   */
>  
> -static int mmpcam_runtime_resume(struct device *dev)
> +static int __maybe_unused mmpcam_runtime_resume(struct device *dev)
>  {
>  	struct mmp_camera *cam = dev_get_drvdata(dev);
>  	struct mcam_camera *mcam = &cam->mcam;
> @@ -321,7 +321,7 @@ static int mmpcam_runtime_resume(struct device *dev)
>  	return 0;
>  }
>  
> -static int mmpcam_runtime_suspend(struct device *dev)
> +static int __maybe_unused mmpcam_runtime_suspend(struct device *dev)
>  {
>  	struct mmp_camera *cam = dev_get_drvdata(dev);
>  	struct mcam_camera *mcam = &cam->mcam;
> @@ -335,7 +335,7 @@ static int mmpcam_runtime_suspend(struct device *dev)
>  	return 0;
>  }
>  
> -static int mmpcam_suspend(struct device *dev)
> +static int __maybe_unused mmpcam_suspend(struct device *dev)
>  {
>  	struct mmp_camera *cam = dev_get_drvdata(dev);
>  
> @@ -344,7 +344,7 @@ static int mmpcam_suspend(struct device *dev)
>  	return 0;
>  }
>  
> -static int mmpcam_resume(struct device *dev)
> +static int __maybe_unused mmpcam_resume(struct device *dev)
>  {
>  	struct mmp_camera *cam = dev_get_drvdata(dev);
>  
> -- 
> 2.17.1
> 
>