tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-4.14 head: 0b385b22ca067383979d97c42cd1fd33976d95d4 commit: cb7668073b2c57128b6909c93a571a02a448997c [30/32] BACKPORT: iio: cros_ec: Use Hertz as unit for sampling frequency config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 487ca07fcc75d52755c9fe2ee05bcb3b6eeeec44) 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 cb7668073b2c57128b6909c93a571a02a448997c # 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 warnings (new ones prefixed by >>, old ones prefixed by <<): default: ^~~~~~~ drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c:736:9: note: uninitialized use occurs here return ret; ^~~ drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c:715:9: note: initialize the variable 'ret' to silence this warning int ret, frequency; ^ = 0 1 warning generated. vim +/ret +732 drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 710 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 711 int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st, 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 712 struct iio_chan_spec const *chan, 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 713 int *val, int *val2, long mask) 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 714 { cb7668073b2c571 Gwendal Grignou 2020-03-27 715 int ret, frequency; 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 716 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 717 switch (mask) { 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 718 case IIO_CHAN_INFO_SAMP_FREQ: 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 719 st->param.cmd = MOTIONSENSE_CMD_SENSOR_ODR; 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 720 st->param.sensor_odr.data = 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 721 EC_MOTION_SENSE_NO_VALUE; 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 722 cb7668073b2c571 Gwendal Grignou 2020-03-27 723 ret = cros_ec_motion_send_host_cmd(st, 0); cb7668073b2c571 Gwendal Grignou 2020-03-27 724 if (ret) cb7668073b2c571 Gwendal Grignou 2020-03-27 725 break; cb7668073b2c571 Gwendal Grignou 2020-03-27 726 cb7668073b2c571 Gwendal Grignou 2020-03-27 727 frequency = st->resp->sensor_odr.ret; cb7668073b2c571 Gwendal Grignou 2020-03-27 728 *val = frequency / 1000; cb7668073b2c571 Gwendal Grignou 2020-03-27 729 *val2 = (frequency % 1000) * 1000; cb7668073b2c571 Gwendal Grignou 2020-03-27 730 ret = IIO_VAL_INT_PLUS_MICRO; 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 731 break; 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 @732 default: 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 733 break; 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 734 } 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 735 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 736 return ret; 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 737 } 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 738 EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read); 974e6f02e27e1b4 Enric Balletbo i Serra 2016-08-01 739 :::::: The code at line 732 was first introduced by commit :::::: 974e6f02e27e1b46c6c5e600e70ced25079f73eb iio: cros_ec_sensors_core: Add common functions for the ChromeOS EC Sensor Hub. :::::: TO: Enric Balletbo i Serra <enric.balletbo(a)collabora.com&gt; :::::: CC: Jonathan Cameron <jic23(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org