Hi Joseph, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on bluetooth-next/master] [also build test WARNING on net-next/master next-20220215] [cannot apply to net/master v5.17-rc4] [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/Joseph-Hwang/Bluetooth-aosp-surf... base: https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git master config: h8300-randconfig-s032-20220214 (https://download.01.org/0day-ci/archive/20220216/202202160117.jjnGwidL-lk...) compiler: h8300-linux-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-dirty # https://github.com/0day-ci/linux/commit/8c2212761e41006d67f3fad819b5bde57... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Joseph-Hwang/Bluetooth-aosp-surface-AOSP-quality-report-through-mgmt/20220215-213800 git checkout 8c2212761e41006d67f3fad819b5bde57bc17773 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=h8300 SHELL=/bin/bash net/bluetooth/ 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 >>) net/bluetooth/hci_event.c:338:15: sparse: sparse: restricted __le16 degrades to integer net/bluetooth/hci_event.c: note: in included file (through include/net/bluetooth/hci_core.h): include/net/bluetooth/hci.h:2473:47: sparse: sparse: array of flexible structures include/net/bluetooth/hci.h:2559:43: sparse: sparse: array of flexible structures vim +/evt_prefixes +4288 net/bluetooth/hci_event.c 4275 4276 /* Every distinct vendor specification must have a well-defined vendor 4277 * event prefix to determine if a vendor event meets the specification. 4278 * If an event prefix is fixed, it should be delcared with FIXED_EVT_PREFIX. 4279 * Otherwise, DYNAMIC_EVT_PREFIX should be used for variable prefixes. 4280 */ 4281 struct vendor_event_prefix { 4282 __u8 *prefix; 4283 __u8 prefix_len; 4284 void (*vendor_func)(struct hci_dev *hdev, void *data, 4285 struct sk_buff *skb); 4286 __u8 *(*get_prefix)(struct hci_dev *hdev); 4287 __u8 (*get_prefix_len)(struct hci_dev *hdev); 4289 FIXED_EVT_PREFIX(AOSP_BQR_PREFIX, aosp_quality_report_evt), 4290 DYNAMIC_EVT_PREFIX(get_msft_evt_prefix, get_msft_evt_prefix_len, 4291 msft_vendor_evt), 4292 4293 /* end with a null entry */ 4294 {}, 4295 }; 4296 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org