Hi Zijun, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on bluetooth/master] [also build test WARNING on net-next/master net/master linus/master v5.19] [cannot apply to bluetooth-next/master next-20220812] [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/Zijun-Hu/Bluetooth-hci_sync-Remove-redundant-func-definition/20220722-191804 base: https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git master config: arm-defconfig (https://download.01.org/0day-ci/archive/20220814/202208142033.Kav1wBRp-lkp@xxxxxxxxx/config) compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0 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 # https://github.com/intel-lab-lkp/linux/commit/01ff3d2230c220a1387940ed594eccda09dc51fb git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Zijun-Hu/Bluetooth-hci_sync-Remove-redundant-func-definition/20220722-191804 git checkout 01ff3d2230c220a1387940ed594eccda09dc51fb # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash net/bluetooth/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> net/bluetooth/hci_sync.c:2398:6: warning: no previous prototype for 'disconnected_accept_list_entries' [-Wmissing-prototypes] 2398 | bool disconnected_accept_list_entries(struct hci_dev *hdev) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/disconnected_accept_list_entries +2398 net/bluetooth/hci_sync.c 2397 > 2398 bool disconnected_accept_list_entries(struct hci_dev *hdev) 2399 { 2400 struct bdaddr_list *b; 2401 2402 list_for_each_entry(b, &hdev->accept_list, list) { 2403 struct hci_conn *conn; 2404 2405 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &b->bdaddr); 2406 if (!conn) 2407 return true; 2408 2409 if (conn->state != BT_CONNECTED && conn->state != BT_CONFIG) 2410 return true; 2411 } 2412 2413 return false; 2414 } 2415 -- 0-DAY CI Kernel Test Service https://01.org/lkp