linux-kernel - Re: arch/arm/crypto/sha1_glue.c:34:8: warning: cast from 'void (*)(u32 *, const unsigned char *, unsigned int)' (aka 'void (*)(unsigned int *, const unsigned char *, unsigned int)') to 'sha1_block_fn *' (aka 'void (*)(struct sha1

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Date:   Thu, 8 Dec 2022 12:58:50 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     kernel test robot <lkp@...el.com>
Cc:     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>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: Re: arch/arm/crypto/sha1_glue.c:34:8: warning: cast from 'void
 (*)(u32 *, const unsigned char *, unsigned int)' (aka 'void (*)(unsigned int
 *, const unsigned char *, unsigned int)') to 'sha1_block_fn *' (aka 'void
 (*)(struct sha1_state *, const unsigned char ...

On Fri, Nov 04, 2022 at 07:33:43PM +0800, kernel test robot wrote:
>
> vim +34 arch/arm/crypto/sha1_glue.c
> 
> f0be44f4fb1fae David McCullough 2012-09-07  23  
> 1f8673d31a999e Jussi Kivilinna  2014-07-29  24  asmlinkage void sha1_block_data_order(u32 *digest,
> f0be44f4fb1fae David McCullough 2012-09-07  25  		const unsigned char *data, unsigned int rounds);
> f0be44f4fb1fae David McCullough 2012-09-07  26  
> 604682551aa511 Jussi Kivilinna  2014-07-29  27  int sha1_update_arm(struct shash_desc *desc, const u8 *data,
> f0be44f4fb1fae David McCullough 2012-09-07  28  		    unsigned int len)
> f0be44f4fb1fae David McCullough 2012-09-07  29  {
> 90451d6bdb787e Ard Biesheuvel   2015-04-09  30  	/* make sure casting to sha1_block_fn() is safe */
> 90451d6bdb787e Ard Biesheuvel   2015-04-09  31  	BUILD_BUG_ON(offsetof(struct sha1_state, state) != 0);
> f0be44f4fb1fae David McCullough 2012-09-07  32  
> 90451d6bdb787e Ard Biesheuvel   2015-04-09  33  	return sha1_base_do_update(desc, data, len,
> 90451d6bdb787e Ard Biesheuvel   2015-04-09 @34  				   (sha1_block_fn *)sha1_block_data_order);
> f0be44f4fb1fae David McCullough 2012-09-07  35  }
> 604682551aa511 Jussi Kivilinna  2014-07-29  36  EXPORT_SYMBOL_GPL(sha1_update_arm);
> f0be44f4fb1fae David McCullough 2012-09-07  37  

So clan doesn't like the cast on the assembly function.

Ard, why can't we just change the signature of the assembly
function instead of casting?

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