Hi Stephen, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: c457d9676496f5a895509f9c510278beaaffc829 commit: e64512824389f78a7b15766c2500731f4d7a4615 [13957/14602] Merge remote-tracking branch 'mips/mips-next' config: mips-randconfig-r024-20210422 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project f5446b769a7929806f72256fccd4826d66502e59) 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 mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=e64512824389f78a7b15766c2500731f4d7a4615 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout e64512824389f78a7b15766c2500731f4d7a4615 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): >> drivers/iio/common/scmi_sensors/scmi_iio.c:70:4: error: couldn't allocate output register for constraint 'x' do_div(time, int_pow(10, abs(tstamp_scale))); ^ include/asm-generic/div64.h:245:11: note: expanded from macro 'do_div' __rem = __div64_32(&(n), __base); \ ^ arch/mips/include/asm/div64.h:76:11: note: expanded from macro '__div64_32' __asm__("divu $0, %z1, %z2" \ ^ drivers/iio/common/scmi_sensors/scmi_iio.c:163:2: error: couldn't allocate output register for constraint 'x' do_div(sec, uHz); ^ include/asm-generic/div64.h:245:11: note: expanded from macro 'do_div' __rem = __div64_32(&(n), __base); \ ^ arch/mips/include/asm/div64.h:76:11: note: expanded from macro '__div64_32' __asm__("divu $0, %z1, %z2" \ ^ drivers/iio/common/scmi_sensors/scmi_iio.c:243:2: error: couldn't allocate output register for constraint 'x' do_div(*uhz, interval_ns); ^ include/asm-generic/div64.h:245:11: note: expanded from macro 'do_div' __rem = __div64_32(&(n), __base); \ ^ arch/mips/include/asm/div64.h:76:11: note: expanded from macro '__div64_32' __asm__("divu $0, %z1, %z2" \ ^ 3 errors generated. vim +70 drivers/iio/common/scmi_sensors/scmi_iio.c f774117c96f94c Jyoti Bhayana 2021-03-09 34 f774117c96f94c Jyoti Bhayana 2021-03-09 35 static int scmi_iio_sensor_update_cb(struct notifier_block *nb, f774117c96f94c Jyoti Bhayana 2021-03-09 36 unsigned long event, void *data) f774117c96f94c Jyoti Bhayana 2021-03-09 37 { f774117c96f94c Jyoti Bhayana 2021-03-09 38 struct scmi_sensor_update_report *sensor_update = data; f774117c96f94c Jyoti Bhayana 2021-03-09 39 struct iio_dev *scmi_iio_dev; f774117c96f94c Jyoti Bhayana 2021-03-09 40 struct scmi_iio_priv *sensor; f774117c96f94c Jyoti Bhayana 2021-03-09 41 s8 tstamp_scale; f774117c96f94c Jyoti Bhayana 2021-03-09 42 u64 time, time_ns; f774117c96f94c Jyoti Bhayana 2021-03-09 43 int i; f774117c96f94c Jyoti Bhayana 2021-03-09 44 f774117c96f94c Jyoti Bhayana 2021-03-09 45 if (sensor_update->readings_count == 0) f774117c96f94c Jyoti Bhayana 2021-03-09 46 return NOTIFY_DONE; f774117c96f94c Jyoti Bhayana 2021-03-09 47 f774117c96f94c Jyoti Bhayana 2021-03-09 48 sensor = container_of(nb, struct scmi_iio_priv, sensor_update_nb); f774117c96f94c Jyoti Bhayana 2021-03-09 49 f774117c96f94c Jyoti Bhayana 2021-03-09 50 for (i = 0; i < sensor_update->readings_count; i++) f774117c96f94c Jyoti Bhayana 2021-03-09 51 sensor->iio_buf[i] = sensor_update->readings[i].value; f774117c96f94c Jyoti Bhayana 2021-03-09 52 f774117c96f94c Jyoti Bhayana 2021-03-09 53 if (!sensor->sensor_info->timestamped) { f774117c96f94c Jyoti Bhayana 2021-03-09 54 time_ns = ktime_to_ns(sensor_update->timestamp); f774117c96f94c Jyoti Bhayana 2021-03-09 55 } else { f774117c96f94c Jyoti Bhayana 2021-03-09 56 /* f774117c96f94c Jyoti Bhayana 2021-03-09 57 * All the axes are supposed to have the same value for timestamp. f774117c96f94c Jyoti Bhayana 2021-03-09 58 * We are just using the values from the Axis 0 here. f774117c96f94c Jyoti Bhayana 2021-03-09 59 */ f774117c96f94c Jyoti Bhayana 2021-03-09 60 time = sensor_update->readings[0].timestamp; f774117c96f94c Jyoti Bhayana 2021-03-09 61 f774117c96f94c Jyoti Bhayana 2021-03-09 62 /* f774117c96f94c Jyoti Bhayana 2021-03-09 63 * Timestamp returned by SCMI is in seconds and is equal to f774117c96f94c Jyoti Bhayana 2021-03-09 64 * time * power-of-10 multiplier(tstamp_scale) seconds. f774117c96f94c Jyoti Bhayana 2021-03-09 65 * Converting the timestamp to nanoseconds below. f774117c96f94c Jyoti Bhayana 2021-03-09 66 */ f774117c96f94c Jyoti Bhayana 2021-03-09 67 tstamp_scale = sensor->sensor_info->tstamp_scale + f774117c96f94c Jyoti Bhayana 2021-03-09 68 const_ilog2(NSEC_PER_SEC) / const_ilog2(10); f774117c96f94c Jyoti Bhayana 2021-03-09 69 if (tstamp_scale < 0) { f774117c96f94c Jyoti Bhayana 2021-03-09 @70 do_div(time, int_pow(10, abs(tstamp_scale))); f774117c96f94c Jyoti Bhayana 2021-03-09 71 time_ns = time; f774117c96f94c Jyoti Bhayana 2021-03-09 72 } else { f774117c96f94c Jyoti Bhayana 2021-03-09 73 time_ns = time * int_pow(10, tstamp_scale); f774117c96f94c Jyoti Bhayana 2021-03-09 74 } f774117c96f94c Jyoti Bhayana 2021-03-09 75 } f774117c96f94c Jyoti Bhayana 2021-03-09 76 f774117c96f94c Jyoti Bhayana 2021-03-09 77 scmi_iio_dev = sensor->indio_dev; f774117c96f94c Jyoti Bhayana 2021-03-09 78 iio_push_to_buffers_with_timestamp(scmi_iio_dev, sensor->iio_buf, f774117c96f94c Jyoti Bhayana 2021-03-09 79 time_ns); f774117c96f94c Jyoti Bhayana 2021-03-09 80 return NOTIFY_OK; f774117c96f94c Jyoti Bhayana 2021-03-09 81 } f774117c96f94c Jyoti Bhayana 2021-03-09 82 :::::: The code at line 70 was first introduced by commit :::::: f774117c96f94c7c4d2f076e4cacc80218b0df48 iio/scmi: Adding support for IIO SCMI Based Sensors :::::: TO: Jyoti Bhayana <jbhayana@xxxxxxxxxx> :::::: CC: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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