linux-kernel - Re: [PATCH] lib/crypto: blake2b: Limit frame size workaround to GCC

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Message-ID: <aSJpl/MuavSLoJjK@rli9-mobl>
Date: Sun, 23 Nov 2025 09:55:35 +0800
From: kernel test robot <lkp@...el.com>
To: Thorsten Blum <thorsten.blum@...ux.dev>, Eric Biggers
	<ebiggers@...nel.org>, "Jason A. Donenfeld" <Jason@...c4.com>, Ard Biesheuvel
	<ardb@...nel.org>
CC: <oe-kbuild-all@...ts.linux.dev>, Thorsten Blum <thorsten.blum@...ux.dev>,
	<linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] lib/crypto: blake2b: Limit frame size workaround to GCC
 < 12.2 on i386

Hi Thorsten,

kernel test robot noticed the following build warnings:

[auto build test WARNING on ebiggers/libcrypto-next]
[also build test WARNING on next-20251121]
[cannot apply to ebiggers/libcrypto-fixes crng-random/master linus/master v6.18-rc6]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Thorsten-Blum/lib-crypto-blake2b-Limit-frame-size-workaround-to-GCC-12-2-on-i386/20251122-185851
base:   https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git libcrypto-next
patch link:    https://lore.kernel.org/r/20251122105530.441350-2-thorsten.blum%40linux.dev
patch subject: [PATCH] lib/crypto: blake2b: Limit frame size workaround to GCC < 12.2 on i386
:::::: branch date: 13 hours ago
:::::: commit date: 13 hours ago
config: m68k-allmodconfig (https://download.01.org/0day-ci/archive/20251123/202511230820.9CzhKlk6-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251123/202511230820.9CzhKlk6-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/r/202511230820.9CzhKlk6-lkp@intel.com/

All warnings (new ones prefixed by >>):

   lib/crypto/blake2b.c: In function 'blake2b_compress_generic':
>> lib/crypto/blake2b.c:108:1: warning: the frame size of 3440 bytes is larger than 1024 bytes [-Wframe-larger-than=]
     108 | }
         | ^


vim +108 lib/crypto/blake2b.c

23a16c9533ed92 Eric Biggers 2025-10-17  101  
23a16c9533ed92 Eric Biggers 2025-10-17  102  		for (i = 0; i < 8; ++i)
23a16c9533ed92 Eric Biggers 2025-10-17  103  			ctx->h[i] ^= v[i] ^ v[i + 8];
23a16c9533ed92 Eric Biggers 2025-10-17  104  
23a16c9533ed92 Eric Biggers 2025-10-17  105  		data += BLAKE2B_BLOCK_SIZE;
23a16c9533ed92 Eric Biggers 2025-10-17  106  		--nblocks;
23a16c9533ed92 Eric Biggers 2025-10-17  107  	}
23a16c9533ed92 Eric Biggers 2025-10-17 @108  }
23a16c9533ed92 Eric Biggers 2025-10-17  109  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki