linux-kernel - Re: [PATCH] serial: mxs-uart: fix Wvoid-pointer-to-enum-cast warning

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Date:   Thu, 10 Aug 2023 17:44:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Jiri Slaby <jirislaby@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Andi Shyti <andi.shyti@...nel.org>
Subject: Re: [PATCH] serial: mxs-uart: fix Wvoid-pointer-to-enum-cast warning

On Thu, Aug 10, 2023 at 10:50:42AM +0200, Krzysztof Kozlowski wrote:
> `devtype` is enum, thus cast of pointer on 64-bit compile test with W=1
> causes:
> 
>   mxs-auart.c:1598:15: error: cast to smaller integer type 'enum mxs_auart_type' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast]
> 
> Cc: Andi Shyti <andi.shyti@...nel.org>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
>  drivers/tty/serial/mxs-auart.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
> index 8eeecf8ad359..a9b32722b049 100644
> --- a/drivers/tty/serial/mxs-auart.c
> +++ b/drivers/tty/serial/mxs-auart.c
> @@ -1595,7 +1595,7 @@ static int mxs_auart_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  	}
>  
> -	s->devtype = (enum mxs_auart_type)of_device_get_match_data(&pdev->dev);
> +	s->devtype = (uintptr_t)of_device_get_match_data(&pdev->dev);

This feels like a compiler issue as devtype is a enum mxs_auart_type
variable, so the cast shoudl be correct.

And if not, unitptr_t isn't a valid kernel type, so that's not a good
solution either.  Worst case, it's how big a pointer is, which is not
going to be what an enum is if you have a sane compiler :(

thanks,

greg k-h