linux-kernel - Re: [PATCH v2] mtd: maps: fix -Wvoid-pointer-to-enum-cast warning

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Date:   Fri, 18 Aug 2023 16:40:59 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Justin Stitt <justinstitt@...gle.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v2] mtd: maps: fix -Wvoid-pointer-to-enum-cast warning

On Wed, 2023-08-16 at 18:26:44 UTC, Justin Stitt wrote:
> When building with clang 18 I see the following warning:
> |       drivers/mtd/maps/physmap-versatile.c:209:25: warning: cast to smaller
> |               integer type 'enum versatile_flashprot' from 'const void *' [-Wvoid-pointer-to-enum-cast]
> |         209 |                 versatile_flashprot = (enum versatile_flashprot)devid->data;
> 
> This is due to the fact that `devid->data` is a void* while `enum versatile_flashprot`
> has the size of an int.
> 
> Cast `devid->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>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/next, thanks.

Miquel