Hi, kernel test robot noticed the following build warnings: [auto build test WARNING on bluetooth/master] [also build test WARNING on bluetooth-next/master linus/master v6.3 next-20230426] [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/sean-wang-mediatek-com/Bluetooth-btmtk-introduce-btmtk-reset-work/20230427-071054 base: https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git master patch link: https://lore.kernel.org/r/01d3fe06d3a1e333b193e7d9fbc9cbfb4ee5d02b.1682549719.git.objelf%40gmail.com patch subject: [PATCH v4 3/3] Bluetooth: btusb: mediatek: add MediaTek devcoredump support config: x86_64-randconfig-r035-20211003 (https://download.01.org/0day-ci/archive/20230428/202304280130.Aoglg07c-lkp@xxxxxxxxx/config) compiler: gcc-11 (Debian 11.3.0-12) 11.3.0 reproduce (this is a W=1 build): # https://github.com/intel-lab-lkp/linux/commit/d253c927e94cb7e88bfcd0182449d29e477ca011 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review sean-wang-mediatek-com/Bluetooth-btmtk-introduce-btmtk-reset-work/20230427-071054 git checkout d253c927e94cb7e88bfcd0182449d29e477ca011 # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=x86_64 olddefconfig make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Link: https://lore.kernel.org/oe-kbuild-all/202304280130.Aoglg07c-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from drivers/bluetooth/btusb.c:28: >> drivers/bluetooth/btmtk.h:172:6: warning: no previous prototype for 'btmtk_register_coredump' [-Wmissing-prototypes] 172 | void btmtk_register_coredump(struct hci_dev *hdev, u32 dev_id, const char *name, | ^~~~~~~~~~~~~~~~~~~~~~~ vim +/btmtk_register_coredump +172 drivers/bluetooth/btmtk.h 171 > 172 void btmtk_register_coredump(struct hci_dev *hdev, u32 dev_id, const char *name, 173 u32 fw_version) 174 { 175 } 176 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
