linux-kernel - Re: [PATCH] crypto: arm/sha512-neon - Fix clang function cast warnings

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Date:   Wed, 19 Apr 2023 14:56:17 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     kernel test robot <lkp@...el.com>,
        Robert Elliott <elliott@....com>, llvm@...ts.linux.dev,
        oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH] crypto: arm/sha512-neon - Fix clang function cast warnings

On Wed, Apr 19, 2023 at 2:35 AM Herbert Xu <herbert@...dor.apana.org.au> wrote:
>
> Instead of casting the function which upsets clang for some reason,
> change the assembly function siganture instead.

Same comments as sha1 and sha256.  Looks like more casts to remove:

arch/arm/crypto/sha512-glue.c
34:             (sha512_block_fn *)sha512_block_data_order);
40:             (sha512_block_fn *)sha512_block_data_order);
48:             (sha512_block_fn *)sha512_block_data_order);



>
> Reported-by: kernel test robot <lkp@...el.com>
> Link: https://lore.kernel.org/oe-kbuild-all/202304081828.zjGcFUyE-lkp@intel.com/
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
>
> diff --git a/arch/arm/crypto/sha512-neon-glue.c b/arch/arm/crypto/sha512-neon-glue.c
> index c879ad32db51..c6e58fe475ac 100644
> --- a/arch/arm/crypto/sha512-neon-glue.c
> +++ b/arch/arm/crypto/sha512-neon-glue.c
> @@ -20,8 +20,8 @@
>  MODULE_ALIAS_CRYPTO("sha384-neon");
>  MODULE_ALIAS_CRYPTO("sha512-neon");
>
> -asmlinkage void sha512_block_data_order_neon(u64 *state, u8 const *src,
> -                                            int blocks);
> +asmlinkage void sha512_block_data_order_neon(struct sha512_state *state,
> +                                            const u8 *src, int blocks);
>
>  static int sha512_neon_update(struct shash_desc *desc, const u8 *data,
>                               unsigned int len)
> @@ -33,8 +33,7 @@ static int sha512_neon_update(struct shash_desc *desc, const u8 *data,
>                 return sha512_arm_update(desc, data, len);
>
>         kernel_neon_begin();
> -       sha512_base_do_update(desc, data, len,
> -               (sha512_block_fn *)sha512_block_data_order_neon);
> +       sha512_base_do_update(desc, data, len, sha512_block_data_order_neon);
>         kernel_neon_end();
>
>         return 0;
> @@ -49,9 +48,8 @@ static int sha512_neon_finup(struct shash_desc *desc, const u8 *data,
>         kernel_neon_begin();
>         if (len)
>                 sha512_base_do_update(desc, data, len,
> -                       (sha512_block_fn *)sha512_block_data_order_neon);
> -       sha512_base_do_finalize(desc,
> -               (sha512_block_fn *)sha512_block_data_order_neon);
> +                                     sha512_block_data_order_neon);
> +       sha512_base_do_finalize(desc, sha512_block_data_order_neon);
>         kernel_neon_end();
>
>         return sha512_base_finish(desc, out);
> --
> 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
>


-- 
Thanks,
~Nick Desaulniers