Hi David, kernel test robot noticed the following build warnings: [auto build test WARNING on 0f718e10da81446df0909c9939dff2b77e3b4e95] url: https://github.com/intel-lab-lkp/linux/commits/David-Lechner/iio-adc-ad4695-add-2nd-regmap-for-16-bit-registers/20240821-000102 base: 0f718e10da81446df0909c9939dff2b77e3b4e95 patch link: https://lore.kernel.org/r/20240820-ad4695-gain-offset-v1-2-c8f6e3b47551%40baylibre.com patch subject: [PATCH 2/4] iio: adc: ad4695: implement calibration support config: i386-buildonly-randconfig-002-20240821 (https://download.01.org/0day-ci/archive/20240821/202408211207.fmYTjQDK-lkp@xxxxxxxxx/config) compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240821/202408211207.fmYTjQDK-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202408211207.fmYTjQDK-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> drivers/iio/adc/ad4695.c:735:6: warning: unused variable 'ret' [-Wunused-variable] 735 | int ret; | ^~~ 1 warning generated. vim +/ret +735 drivers/iio/adc/ad4695.c 728 729 static int ad4695_write_raw(struct iio_dev *indio_dev, 730 struct iio_chan_spec const *chan, 731 int val, int val2, long mask) 732 { 733 struct ad4695_state *st = iio_priv(indio_dev); 734 unsigned int reg_val; > 735 int ret; 736 737 iio_device_claim_direct_scoped(return -EBUSY, indio_dev) { 738 switch (mask) { 739 case IIO_CHAN_INFO_CALIBSCALE: 740 switch (chan->type) { 741 case IIO_VOLTAGE: 742 if (val < 0 || val2 < 0) 743 reg_val = 0; 744 else if (val > 1) 745 reg_val = U16_MAX; 746 else 747 reg_val = (val * (1 << 16) + 748 mul_u64_u32_div(val2, 1 << 16, 749 MICRO)) / 2; 750 751 return regmap_write(st->regmap16, 752 AD4695_REG_GAIN_IN(chan->scan_index), 753 reg_val); 754 default: 755 return -EINVAL; 756 } 757 case IIO_CHAN_INFO_CALIBBIAS: 758 switch (chan->type) { 759 case IIO_VOLTAGE: 760 if (val2 >= 0 && val > S16_MAX / 4) 761 reg_val = S16_MAX; 762 else if ((val2 < 0 ? -val : val) < S16_MIN / 4) 763 reg_val = S16_MIN; 764 else if (val2 < 0) 765 reg_val = clamp_t(int, 766 -(val * 4 + -val2 * 4 / MICRO), 767 S16_MIN, S16_MAX); 768 else if (val < 0) 769 reg_val = clamp_t(int, 770 val * 4 - val2 * 4 / MICRO, 771 S16_MIN, S16_MAX); 772 else 773 reg_val = clamp_t(int, 774 val * 4 + val2 * 4 / MICRO, 775 S16_MIN, S16_MAX); 776 777 return regmap_write(st->regmap16, 778 AD4695_REG_OFFSET_IN(chan->scan_index), 779 reg_val); 780 default: 781 return -EINVAL; 782 } 783 default: 784 return -EINVAL; 785 } 786 } 787 unreachable(); 788 } 789 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
