tree: https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/i2c/smbus-cleanup head: 06a3965f7ca847f8c42e7715251164ba6255e2a2 commit: d1a63e5917cd60f1599b8a3a602bdef80e8b2bb3 [13/14] media: i2c: adv7842: remove open coded version of SMBus block read config: x86_64-randconfig-a005-20210112 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 32bcfcda4e28375e5a85268d2acfabcfcc011abf) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git/commit/?id=... git remote add wsa https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git git fetch --no-tags wsa renesas/i2c/smbus-cleanup git checkout d1a63e5917cd60f1599b8a3a602bdef80e8b2bb3 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>): s32 len; ^ drivers/media/i2c/adv7511-v4l2.c:217:61: note: previous definition is here static int adv7511_edid_rd(struct v4l2_subdev *sd, uint16_t len, uint8_t *buf) ^ 1 error generated. vim +220 drivers/media/i2c/adv7511-v4l2.c 216 217 static int adv7511_edid_rd(struct v4l2_subdev *sd, uint16_t len, uint8_t *buf) 218 { 219 struct adv7511_state *state = get_adv7511_state(sd); 221 int i; 222 223 v4l2_dbg(1, debug, sd, "%s:\n", __func__); 224 225 for (i = 0; i < len; i += I2C_SMBUS_BLOCK_MAX) { 226 len = i2c_smbus_read_i2c_block_data(state->i2c_edid, i, 227 I2C_SMBUS_BLOCK_MAX, buf + i); 228 if (len < 0) { 229 v4l2_err(sd, "%s: i2c read error\n", __func__); 230 return len; 231 } 232 } 233 234 return 0; 235 } 236 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org