Hi "Nuno, I love your patch! Perhaps something to improve: [auto build test WARNING on jic23-iio/togreg] [also build test WARNING on robh/for-next linus/master v5.17-rc1 next-20220124] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Nuno-S/Add-support-for-LTC2688/2... base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg config: i386-randconfig-s031-20220124 (https://download.01.org/0day-ci/archive/20220124/202201241727.j3X0hKVI-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.4-dirty # https://github.com/0day-ci/linux/commit/2493f2a925ebd05e3afc2e5632452566c... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Nuno-S/Add-support-for-LTC2688/20220121-222705 git checkout 2493f2a925ebd05e3afc2e5632452566cfa6cbb5 # save the config file to linux build tree mkdir build_dir make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash drivers/iio/dac/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) Please review and possibly fold the followup patch. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org