tree: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git for-5.8 head: 0c680ffb99ea4022b97fbbf831da46b0f90958a5 commit: 4ffea5e083f8125fe273cf331ecb10d901eb64a2 [14/15] regulator: max8998: Add charger regulator config: x86_64-randconfig-a011-20200521 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 3393cc4cebf9969db94dc424b7a2b6195589c33b) 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 git checkout 4ffea5e083f8125fe273cf331ecb10d901eb64a2 # 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: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): int max8998_set_current_limit(struct regulator_dev *rdev, ^ drivers/regulator/max8998.c:374:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int max8998_set_current_limit(struct regulator_dev *rdev, ^ static int max8998_get_current_limit(struct regulator_dev *rdev) ^ drivers/regulator/max8998.c:418:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int max8998_get_current_limit(struct regulator_dev *rdev) ^ static 2 warnings generated. vim +/max8998_set_current_limit +374 drivers/regulator/max8998.c 373 375 int min_uA, int max_uA) 376 { 377 struct max8998_data *max8998 = rdev_get_drvdata(rdev); 378 struct i2c_client *i2c = max8998->iodev->i2c; 379 unsigned int n_currents = rdev->desc->n_current_limits; 380 int i, sel = -1; 381 382 if (n_currents == 0) 383 return -EINVAL; 384 385 if (rdev->desc->curr_table) { 386 const unsigned int *curr_table = rdev->desc->curr_table; 387 bool ascend = curr_table[n_currents - 1] > curr_table[0]; 388 389 /* search for closest to maximum */ 390 if (ascend) { 391 for (i = n_currents - 1; i >= 0; i--) { 392 if (min_uA <= curr_table[i] && 393 curr_table[i] <= max_uA) { 394 sel = i; 395 break; 396 } 397 } 398 } else { 399 for (i = 0; i < n_currents; i++) { 400 if (min_uA <= curr_table[i] && 401 curr_table[i] <= max_uA) { 402 sel = i; 403 break; 404 } 405 } 406 } 407 } 408 409 if (sel < 0) 410 return -EINVAL; 411 412 sel <<= ffs(rdev->desc->csel_mask) - 1; 413 414 return max8998_update_reg(i2c, rdev->desc->csel_reg, 415 sel, rdev->desc->csel_mask); 416 } 417 419 { 420 struct max8998_data *max8998 = rdev_get_drvdata(rdev); 421 struct i2c_client *i2c = max8998->iodev->i2c; 422 u8 val; 423 int ret; 424 425 ret = max8998_read_reg(i2c, rdev->desc->csel_reg, &val); 426 if (ret != 0) 427 return ret; 428 429 val &= rdev->desc->csel_mask; 430 val >>= ffs(rdev->desc->csel_mask) - 1; 431 432 if (rdev->desc->curr_table) { 433 if (val >= rdev->desc->n_current_limits) 434 return -EINVAL; 435 436 return rdev->desc->curr_table[val]; 437 } 438 439 return -EINVAL; 440 } 441 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org