Hi Puma, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on usb/usb-testing] [also build test WARNING on usb/usb-next usb/usb-linus linus/master v6.1 next-20221214] [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/Puma-Hsu/add-vendor-hooks-for-usb-suspend-and-resume/20221214-150942 base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing patch link: https://lore.kernel.org/r/20221214070650.703793-3-pumahsu%40google.com patch subject: [PATCH 2/2] usb: core: add implementations for usb suspend/resume hooks config: x86_64-rhel-8.3-rust compiler: gcc-11 (Debian 11.3.0-8) 11.3.0 reproduce (this is a W=1 build): # https://github.com/intel-lab-lkp/linux/commit/de7c2e5c48eae351485a1bab4b8f92c399ea6c54 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Puma-Hsu/add-vendor-hooks-for-usb-suspend-and-resume/20221214-150942 git checkout de7c2e5c48eae351485a1bab4b8f92c399ea6c54 # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/usb/core/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> drivers/usb/core/usb-hooks-impl-goog.c:69:5: warning: no previous prototype for 'usb_vendor_helper_init' [-Wmissing-prototypes] 69 | int usb_vendor_helper_init(void) | ^~~~~~~~~~~~~~~~~~~~~~ vim +/usb_vendor_helper_init +69 drivers/usb/core/usb-hooks-impl-goog.c 68 > 69 int usb_vendor_helper_init(void) -- 0-DAY CI Kernel Test Service https://01.org/lkp