tree: https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/fixes head: 0bc731700ec65606803c407901cef999a204fbb7 commit: 4476397eda3ba791b7896e60b5cbaa022f41728b [1/8] mtd: rawnand: cs553x: Fix external use of SW Hamming ECC helper config: i386-randconfig-s002-20210510 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git/commit/?id=... git remote add mtd https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git git fetch --no-tags mtd mtd/fixes git checkout 4476397eda3ba791b7896e60b5cbaa022f41728b # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/mtd/nand/raw/cs553x_nand.c: In function 'cs553x_ecc_correct': 248 | return ecc_sw_hamming_correct(buf, read_ecc, calc_ecc, | ^~~~~~~~~~~~~~~~~~~~~~ | rawnand_sw_hamming_correct cc1: some warnings being treated as errors vim +248 drivers/mtd/nand/raw/cs553x_nand.c 242 243 static int cs553x_ecc_correct(struct nand_chip *chip, 244 unsigned char *buf, 245 unsigned char *read_ecc, 246 unsigned char *calc_ecc) 247 { 249 chip->ecc.size, false); 250 } 251 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org