Hi Michal, kernel test robot noticed the following build warnings: [auto build test WARNING on rafael-pm/linux-next] [also build test WARNING on nvdimm/libnvdimm-for-next] [cannot apply to nvdimm/dax-misc] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Michal-Wilczynski/acpi-bus-Introduce-wrappers-for-ACPICA-event-handler-install-remove/20230701-023629 base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next patch link: https://lore.kernel.org/r/20230630183344.891077-8-michal.wilczynski%40intel.com patch subject: [PATCH v6 7/9] acpi/nfit: Move handler installing logic to driver config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20230701/202307010426.IaTkXyNX-lkp@xxxxxxxxx/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce: (https://download.01.org/0day-ci/archive/20230701/202307010426.IaTkXyNX-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/202307010426.IaTkXyNX-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> drivers/acpi/nfit/core.c:3294:6: warning: no previous prototype for 'acpi_nfit_remove_notify_handler' [-Wmissing-prototypes] 3294 | void acpi_nfit_remove_notify_handler(void *data) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/acpi_nfit_remove_notify_handler +3294 drivers/acpi/nfit/core.c 3293 > 3294 void acpi_nfit_remove_notify_handler(void *data) 3295 { 3296 struct acpi_device *adev = data; 3297 3298 acpi_dev_remove_notify_handler(adev, 3299 ACPI_DEVICE_NOTIFY, 3300 acpi_nfit_notify); 3301 } 3302 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki