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

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Date:   Fri, 18 Aug 2023 16:41:04 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Justin Stitt <justinstitt@...gle.com>,
        Stefan Agner <stefan@...er.ch>,
        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:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v2] mtd: rawnand: fix -Wvoid-pointer-to-enum-cast warning

On Thu, 2023-08-17 at 17:52:21 UTC, Justin Stitt wrote:
> When building with clang 18 I see the following warning:
> |       drivers/mtd/nand/raw/vf610_nfc.c:853:17: warning: cast to smaller integer
> |               type 'enum vf610_nfc_variant' from 'const void *' [-Wvoid-pointer-to-enum-cast]
> |         853 |         nfc->variant = (enum vf610_nfc_variant)of_id->data;
> 
> This is due to the fact that `of_id->data` is a void* while `enum vf610_nfc_variant`
> has the size of an int.
> 
> Cast `of_id->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 nand/next, thanks.

Miquel