Hi Jean-Baptiste, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on iio/togreg] [also build test WARNING on robh/for-next linus/master v5.7 next-20200608] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Jean-Baptiste-Maneyrol/iio-imu-n... base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg config: ia64-allmodconfig (attached as .config) compiler: ia64-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=ia64 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 <<): drivers/iio/imu/inv_icm42600/inv_icm42600_core.c: In function 'inv_icm42600_get_mount_matrix': >> drivers/iio/imu/inv_icm42600/inv_icm42600_core.c:91:63: warning: passing argument 1 of 'iio_device_get_drvdata' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers] 91 | const struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev); | ^~~~~~~~~ In file included from drivers/iio/imu/inv_icm42600/inv_icm42600_core.c:15: include/linux/iio/iio.h:672:60: note: expected 'struct iio_dev *' but argument is of type 'const struct iio_dev *' 672 | static inline void *iio_device_get_drvdata(struct iio_dev *indio_dev) | ~~~~~~~~~~~~~~~~^~~~~~~~~ vim +91 drivers/iio/imu/inv_icm42600/inv_icm42600_core.c 632e967c33fb32 Jean-Baptiste Maneyrol 2020-06-08 86 632e967c33fb32 Jean-Baptiste Maneyrol 2020-06-08 87 const struct iio_mount_matrix * 632e967c33fb32 Jean-Baptiste Maneyrol 2020-06-08 88 inv_icm42600_get_mount_matrix(const struct iio_dev *indio_dev, 632e967c33fb32 Jean-Baptiste Maneyrol 2020-06-08 89 const struct iio_chan_spec *chan) 632e967c33fb32 Jean-Baptiste Maneyrol 2020-06-08 90 { 632e967c33fb32 Jean-Baptiste Maneyrol 2020-06-08 @91 const struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev); 632e967c33fb32 Jean-Baptiste Maneyrol 2020-06-08 92 632e967c33fb32 Jean-Baptiste Maneyrol 2020-06-08 93 return &st->orientation; 632e967c33fb32 Jean-Baptiste Maneyrol 2020-06-08 94 } 632e967c33fb32 Jean-Baptiste Maneyrol 2020-06-08 95 :::::: The code at line 91 was first introduced by commit :::::: 632e967c33fb32bb0a2a2f85a2a8d2e6d2b125f3 iio: imu: inv_icm42600: add core of new inv_icm42600 driver :::::: TO: Jean-Baptiste Maneyrol <jmaneyrol(a)invensense.com&gt; :::::: CC: 0day robot <lkp(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org