linux-kernel - Re: [PATCH] memory: renesas-rpc-if: Silence clang warning

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Date:   Mon, 22 Nov 2021 08:50:26 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH] memory: renesas-rpc-if: Silence clang warning

Hi Prabhakar,

On Sun, Nov 21, 2021 at 7:05 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> This patch silences the following clang warning:
>
> | drivers/memory/renesas-rpc-if.c:253:14: warning: cast to smaller integer
> | type 'enum rpcif_type' from 'const void *' [-Wvoid-pointer-to-enum-cast]
> |           rpc->type = (enum rpcif_type)of_device_get_match_data(dev);
> |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Fixes: b04cc0d912eb8 ("memory: renesas-rpc-if: Add support for RZ/G2L")
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

> --- a/drivers/memory/renesas-rpc-if.c
> +++ b/drivers/memory/renesas-rpc-if.c
> @@ -250,7 +250,7 @@ int rpcif_sw_init(struct rpcif *rpc, struct device *dev)
>                 return PTR_ERR(rpc->dirmap);
>         rpc->size = resource_size(res);
>
> -       rpc->type = (enum rpcif_type)of_device_get_match_data(dev);
> +       rpc->type = (enum rpcif_type)(uintptr_t)of_device_get_match_data(dev);

While correct, the cast to "enum rpcif_type" is not stricly needed anymore.

>         rpc->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
>
>         return PTR_ERR_OR_ZERO(rpc->rstc);

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds