Hi Alexandru, I love your patch! Yet something to improve: [auto build test ERROR on hwmon/hwmon-next] [also build test ERROR on v5.10-rc3 next-20201112] [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] url: https://github.com/0day-ci/linux/commits/Alexandru-Ardelean/hwmon-ltc2945... base: https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next config: powerpc64-randconfig-r005-20201111 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 874b0a0b9db93f5d3350ffe6b5efda2d908415d0) 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 powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://github.com/0day-ci/linux/commit/4e0e9315df2733ae5efe6095c5ab9b767... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Alexandru-Ardelean/hwmon-ltc2945-add-support-for-sense-resistor/20201111-171129 git checkout 4e0e9315df2733ae5efe6095c5ab9b7675d07fb0 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 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 >>): ret = kstrtoul(buf, 10, &val); ^~~~ include/linux/kernel.h:351:90: note: passing argument to parameter 'res' here static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res) ^ 1 error generated. vim +256 drivers/hwmon/ltc2945.c 6700ce035f8301 Guenter Roeck 2014-01-11 241 5614e26d84a99a Guenter Roeck 2018-12-06 242 static ssize_t ltc2945_value_store(struct device *dev, 6700ce035f8301 Guenter Roeck 2014-01-11 243 struct device_attribute *da, 6700ce035f8301 Guenter Roeck 2014-01-11 244 const char *buf, size_t count) 6700ce035f8301 Guenter Roeck 2014-01-11 245 { 6700ce035f8301 Guenter Roeck 2014-01-11 246 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); c159257a60302f Alexandru Ardelean 2020-11-11 247 struct ltc2945_state *st = dev_get_drvdata(dev); c159257a60302f Alexandru Ardelean 2020-11-11 248 struct regmap *regmap = st->regmap; 6700ce035f8301 Guenter Roeck 2014-01-11 249 u8 reg = attr->index; 4e0e9315df2733 Alexandru Ardelean 2020-11-11 250 unsigned long long val; 6700ce035f8301 Guenter Roeck 2014-01-11 251 u8 regbuf[3]; 6700ce035f8301 Guenter Roeck 2014-01-11 252 int num_regs; 6700ce035f8301 Guenter Roeck 2014-01-11 253 int regval; 6700ce035f8301 Guenter Roeck 2014-01-11 254 int ret; 6700ce035f8301 Guenter Roeck 2014-01-11 255 6700ce035f8301 Guenter Roeck 2014-01-11 @256 ret = kstrtoul(buf, 10, &val); 6700ce035f8301 Guenter Roeck 2014-01-11 257 if (ret) 6700ce035f8301 Guenter Roeck 2014-01-11 258 return ret; 6700ce035f8301 Guenter Roeck 2014-01-11 259 6700ce035f8301 Guenter Roeck 2014-01-11 260 /* convert to register value, then clamp and write result */ 6700ce035f8301 Guenter Roeck 2014-01-11 261 regval = ltc2945_val_to_reg(dev, reg, val); 6700ce035f8301 Guenter Roeck 2014-01-11 262 if (is_power_reg(reg)) { 6700ce035f8301 Guenter Roeck 2014-01-11 263 regval = clamp_val(regval, 0, 0xffffff); 6700ce035f8301 Guenter Roeck 2014-01-11 264 regbuf[0] = regval >> 16; 6700ce035f8301 Guenter Roeck 2014-01-11 265 regbuf[1] = (regval >> 8) & 0xff; 6700ce035f8301 Guenter Roeck 2014-01-11 266 regbuf[2] = regval; 6700ce035f8301 Guenter Roeck 2014-01-11 267 num_regs = 3; 6700ce035f8301 Guenter Roeck 2014-01-11 268 } else { 6700ce035f8301 Guenter Roeck 2014-01-11 269 regval = clamp_val(regval, 0, 0xfff) << 4; 6700ce035f8301 Guenter Roeck 2014-01-11 270 regbuf[0] = regval >> 8; 6700ce035f8301 Guenter Roeck 2014-01-11 271 regbuf[1] = regval & 0xff; 6700ce035f8301 Guenter Roeck 2014-01-11 272 num_regs = 2; 6700ce035f8301 Guenter Roeck 2014-01-11 273 } 6700ce035f8301 Guenter Roeck 2014-01-11 274 ret = regmap_bulk_write(regmap, reg, regbuf, num_regs); 6700ce035f8301 Guenter Roeck 2014-01-11 275 return ret < 0 ? ret : count; 6700ce035f8301 Guenter Roeck 2014-01-11 276 } 6700ce035f8301 Guenter Roeck 2014-01-11 277 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org