linux-kernel - Re: [PATCH] dmaengine: ti: k3-udma: define udma_pm_resume,suspend with CONFIG_PM

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Message-ID: <ZGPA+V5WqZItfp74@matsya>
Date:   Tue, 16 May 2023 23:14:25 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Tom Rix <trix@...hat.com>
Cc:     peter.ujfalusi@...il.com, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: ti: k3-udma: define udma_pm_resume,suspend
 with CONFIG_PM_SLEEP

On 30-04-23, 22:56, Tom Rix wrote:
> gcc reports
> drivers/dma/ti/k3-udma.c:5552:12: error: ‘udma_pm_resume’
>   defined but not used [-Werror=unused-function]
>  5552 | static int udma_pm_resume(struct device *dev)
>       |            ^~~~~~~~~~~~~~
> drivers/dma/ti/k3-udma.c:5530:12: error: ‘udma_pm_suspend’
>   defined but not used [-Werror=unused-function]
>  5530 | static int udma_pm_suspend(struct device *dev)
>       |            ^~~~~~~~~~~~~~~
> 
> These functions are used conditionally with CONFIG_PM_SLEEP,
> so they should be likewise defined.

A better way would be to use __maybe_unused. I have sent a patch with
that change

> 
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>  drivers/dma/ti/k3-udma.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
> index fc3a2a05ab7b..f189b0f2e423 100644
> --- a/drivers/dma/ti/k3-udma.c
> +++ b/drivers/dma/ti/k3-udma.c
> @@ -5527,6 +5527,7 @@ static int udma_probe(struct platform_device *pdev)
>  	return ret;
>  }
>  
> +#ifdef CONFIG_PM_SLEEP
>  static int udma_pm_suspend(struct device *dev)
>  {
>  	struct udma_dev *ud = dev_get_drvdata(dev);
> @@ -5573,6 +5574,7 @@ static int udma_pm_resume(struct device *dev)
>  
>  	return 0;
>  }
> +#endif
>  
>  static const struct dev_pm_ops udma_pm_ops = {
>  	SET_LATE_SYSTEM_SLEEP_PM_OPS(udma_pm_suspend, udma_pm_resume)
> -- 
> 2.27.0

-- 
~Vinod