Hi Beniamin, I love your patch! Perhaps something to improve: [auto build test WARNING on iio/togreg] [also build test WARNING on v5.4-rc5 next-20191030] [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/Beniamin-Bia/iio-adc-Add-support-for-AD7091R5-ADC/20191031-100114 base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg reproduce: # apt-get install sparse # sparse version: v0.6.1-dirty make ARCH=x86_64 allmodconfig make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> sparse warnings: (new ones prefixed by >>) >> drivers/iio/adc/ad7091r-base.c:207:6: sparse: sparse: symbol 'ad7091r_remove' was not declared. Should it be static? Please review and possibly fold the followup patch. --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation