Hi Darren, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on iio/togreg] [also build test WARNING on linux/master linus/master v5.9-rc1 next-20200818] [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/Darren-Schachter/iio-pulse-Suppo... base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg config: nios2-allyesconfig (attached as .config) compiler: nios2-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nios2 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/iio/pulse/pulse_tiecap.c: In function 'ecap_attr_prescalar_store': >> drivers/iio/pulse/pulse_tiecap.c:193:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable] 193 | int ret; | ^~~ # https://github.com/0day-ci/linux/commit/b454a1487cd33fe1b8962f9e6b5b0ca35... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Darren-Schachter/iio-pulse-Support-PWM-capture-with-TI-AM3358-eCAP-module/20200818-233934 git checkout b454a1487cd33fe1b8962f9e6b5b0ca35b373ece vim +/ret +193 drivers/iio/pulse/pulse_tiecap.c 187 188 static ssize_t ecap_attr_prescalar_store(struct device *dev, 189 struct device_attribute *attr, 190 const char *buf, 191 size_t len) 192 { > 193 int ret; 194 long val; 195 struct ecap_state *state = dev_to_ecap_state(dev); 196 197 if (test_bit(ECAP_ENABLED, &state->flags)) 198 return -EINVAL; 199 200 ret = kstrtol(buf, 16, &val); 201 if (val > 0x05 && val != 0x1E && val != 0x1F) 202 return -EINVAL; 203 204 mutex_lock(&state->lock); 205 state->flags &= ~(0x1F << ECAP_PRESCALAR_OFFSET); // clear bits 206 state->flags |= (val << ECAP_PRESCALAR_OFFSET); 207 mutex_unlock(&state->lock); 208 209 return len; 210 } 211 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org