linux-kernel - Re: [PATCH] [v2] ARM: crypto: fix function cast warnings

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Date: Sat, 24 Feb 2024 08:49:56 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>, "David S. Miller" <davem@...emloft.net>,
	Russell King <linux@...linux.org.uk>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Jussi Kivilinna <jussi.kivilinna@....fi>,
	linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] [v2] ARM: crypto: fix function cast warnings

On Tue, Feb 13, 2024 at 02:49:46PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> clang-16 warns about casting between incompatible function types:
> 
> arch/arm/crypto/sha256_glue.c:37:5: error: cast from 'void (*)(u32 *, const void *, unsigned int)' (aka 'void (*)(unsigned int *, const void *, unsigned int)') to 'sha256_block_fn *' (aka 'void (*)(struct sha256_state *, const unsigned char *, int)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>    37 |                                 (sha256_block_fn *)sha256_block_data_order);
>       |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/arm/crypto/sha512-glue.c:34:3: error: cast from 'void (*)(u64 *, const u8 *, int)' (aka 'void (*)(unsigned long long *, const unsigned char *, int)') to 'sha512_block_fn *' (aka 'void (*)(struct sha512_state *, const unsigned char *, int)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>    34 |                 (sha512_block_fn *)sha512_block_data_order);
>       |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Fix the prototypes for the assembler functions to match the typedef.
> The code already relies on the digest being the first part of the
> state structure, so there is no change in behavior.
> 
> Fixes: c80ae7ca3726 ("crypto: arm/sha512 - accelerated SHA-512 using ARM generic ASM and NEON")
> Fixes: b59e2ae3690c ("crypto: arm/sha256 - move SHA-224/256 ASM/NEON implementation to base layer")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> v2: rewrite change as suggested by Herbert Xu.
> ---
>  arch/arm/crypto/sha256_glue.c | 13 +++++--------
>  arch/arm/crypto/sha512-glue.c | 12 +++++-------
>  2 files changed, 10 insertions(+), 15 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt