linux-kernel - lib/crypto/sm3.c:169:6: warning: stack frame size (1200) exceeds limit (1024) in 'sm3_block

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Message-ID: <202506240133.iBttMRY7-lkp@intel.com>
Date: Tue, 24 Jun 2025 01:38:24 +0800
From: kernel test robot <lkp@...el.com>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: lib/crypto/sm3.c:169:6: warning: stack frame size (1200) exceeds
 limit (1024) in 'sm3_block_generic'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   86731a2a651e58953fc949573895f2fa6d456841
commit: cb16ba46958e41f8d805cbdb027a601b3a0c65b4 crypto: lib/sm3 - Export generic block function
date:   10 weeks ago
config: riscv-allmodconfig (https://download.01.org/0day-ci/archive/20250624/202506240133.iBttMRY7-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project 875b36a8742437b95f623bab1e0332562c7b4b3f)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250624/202506240133.iBttMRY7-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/oe-kbuild-all/202506240133.iBttMRY7-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> lib/crypto/sm3.c:169:6: warning: stack frame size (1200) exceeds limit (1024) in 'sm3_block_generic' [-Wframe-larger-than]
     169 | void sm3_block_generic(struct sm3_state *sctx, u8 const *data, int blocks)
         |      ^
   1 warning generated.


vim +/sm3_block_generic +169 lib/crypto/sm3.c

   168	
 > 169	void sm3_block_generic(struct sm3_state *sctx, u8 const *data, int blocks)
   170	{
   171		u32 W[16];
   172	
   173		do {
   174			sm3_transform(sctx, data, W);
   175			data += SM3_BLOCK_SIZE;
   176		} while (--blocks);
   177	
   178		memzero_explicit(W, sizeof(W));
   179	}
   180	EXPORT_SYMBOL_GPL(sm3_block_generic);
   181	

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