Hi Neal,

I love your patch! Perhaps something to improve:

[auto build test WARNING on herbert-cryptodev-2.6/master]
[also build test WARNING on herbert-crypto-2.6/master next-20221004]
[cannot apply to robh/for-next linus/master v6.0]
[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/Neal-Liu/Add-Aspeed-ACRY-driver-for-hardware-acceleration/20221004-113050
base:   https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master
config: hexagon-allyesconfig
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/b074e55ba308dfda90527144dfa77bea9b9a9321
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Neal-Liu/Add-Aspeed-ACRY-driver-for-hardware-acceleration/20221004-113050
        git checkout b074e55ba308dfda90527144dfa77bea9b9a9321
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/crypto/aspeed/ drivers/net/ethernet/marvell/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/crypto/aspeed/aspeed-acry.c:293:5: warning: variable 'data' is uninitialized when used here [-Wuninitialized]
                                   data <<= 8;
                                   ^~~~
   drivers/crypto/aspeed/aspeed-acry.c:267:10: note: initialize the variable 'data' to silence this warning
           u32 data;
                   ^
                    = 0
   1 warning generated.


vim +/data +293 drivers/crypto/aspeed/aspeed-acry.c

   245	
   246	/*
   247	 * Copy Exp/Mod to DMA buffer for engine used.
   248	 *
   249	 * Params:
   250	 * - mode 0 : Exponential
   251	 * - mode 1 : Modulus
   252	 *
   253	 * Example:
   254	 * - DRAM memory layout:
   255	 *	D[0], D[4], D[8], D[12]
   256	 * - ACRY SRAM memory layout should reverse the order of source data:
   257	 *	D[12], D[8], D[4], D[0]
   258	 */
   259	static int aspeed_acry_rsa_ctx_copy(struct aspeed_acry_dev *acry_dev, void *buf,
   260					    const void *xbuf, size_t nbytes,
   261					    enum aspeed_rsa_key_mode mode)
   262	{
   263		const uint8_t *src = xbuf;
   264		u32 *dw_buf = (u32 *)buf;
   265		int nbits, ndw;
   266		int i, j, idx;
   267		u32 data;
   268	
   269		ACRY_DBG(acry_dev, "nbytes:0x%x, mode:%d\n", nbytes, mode);
   270	
   271		if (nbytes > ASPEED_ACRY_RSA_MAX_KEY_LEN)
   272			return -ENOMEM;
   273	
   274		/* Remove the leading zeros */
   275		while (nbytes > 0 && src[0] == 0) {
   276			src++;
   277			nbytes--;
   278		}
   279	
   280		nbits = nbytes * 8;
   281		if (nbytes > 0)
   282			nbits -= count_leading_zeros(src[0]) - (BITS_PER_LONG - 8);
   283	
   284		/* double-world alignment */
   285		ndw = DIV_ROUND_UP(nbytes, BYTES_PER_DWORD);
   286	
   287		if (nbytes > 0) {
   288			i = BYTES_PER_DWORD - nbytes % BYTES_PER_DWORD;
   289			i %= BYTES_PER_DWORD;
   290	
   291			for (j = ndw; j > 0; j--) {
   292				for (; i < BYTES_PER_DWORD; i++) {
 > 293					data <<= 8;
   294					data |= *src++;
   295				}
   296	
   297				i = 0;
   298	
   299				if (mode == ASPEED_RSA_EXP_MODE)
   300					idx = acry_dev->exp_dw_mapping[j - 1];
   301				else if (mode == ASPEED_RSA_MOD_MODE)
   302					idx = acry_dev->mod_dw_mapping[j - 1];
   303	
   304				dw_buf[idx] = cpu_to_le32(data);
   305			}
   306		}
   307	
   308		return nbits;
   309	}
   310	

-- 
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