linux-kernel - Re: [PATCH] dmaengine: owl-dma: fix clang -Wvoid-pointer-to-enum-cast warning

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Date:   Thu, 17 Aug 2023 12:26:41 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Justin Stitt <justinstitt@...gle.com>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Andreas Färber <afaerber@...e.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-actions@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] dmaengine: owl-dma: fix clang
 -Wvoid-pointer-to-enum-cast warning

On Wed, Aug 16, 2023 at 08:12:50PM +0000, Justin Stitt wrote:
> When building with clang 18 I see the following warning:
> |       drivers/dma/owl-dma.c:1119:14: warning: cast to smaller integer type
> |       'enum owl_dma_id' from 'const void *' [-Wvoid-pointer-to-enum-cast]
> |        1119 | od->devid = (enum owl_dma_id)of_device_get_match_data(&pdev->dev);
> 
> This is due to the fact that `of_device_get_match_data()` returns a
> void* while `enum owl_dma_id` has the size of an int.
> 
> Cast result of `of_device_get_match_data()` to a uintptr_t to silence
> the above warning for clang builds using W=1
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/1910
> Reported-by: Nathan Chancellor <nathan@...nel.org>
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>

Acked-by: Manivannan Sadhasivam <mani@...nel.org>

- Mani

> ---
>  drivers/dma/owl-dma.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/owl-dma.c b/drivers/dma/owl-dma.c
> index b6e0ac8314e5..f340a04579f4 100644
> --- a/drivers/dma/owl-dma.c
> +++ b/drivers/dma/owl-dma.c
> @@ -1116,7 +1116,7 @@ static int owl_dma_probe(struct platform_device *pdev)
>  	dev_info(&pdev->dev, "dma-channels %d, dma-requests %d\n",
>  		 nr_channels, nr_requests);
>  
> -	od->devid = (enum owl_dma_id)of_device_get_match_data(&pdev->dev);
> +	od->devid = (uintptr_t)of_device_get_match_data(&pdev->dev);
>  
>  	od->nr_pchans = nr_channels;
>  	od->nr_vchans = nr_requests;
> 
> ---
> base-commit: 2ccdd1b13c591d306f0401d98dedc4bdcd02b421
> change-id: 20230816-void-drivers-dma-owl-dma-41b95a098275
> 
> Best regards,
> --
> Justin Stitt <justinstitt@...gle.com>
> 

-- 
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