tree: https://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue.git dev-queue head: 820d2640bb89ab196c46c299c066b2ad1ea65b84 commit: 8ca07176ab00a6d06a9b254dcbb2514b4d607e9c [138/260] net: switchdev: introduce a fanout helper for SWITCHDEV_FDB_{ADD,DEL}_TO_DEVICE config: parisc-randconfig-r021-20210720 (attached as .config) compiler: hppa-linux-gcc (GCC) 10.3.0 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://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue.git/comm... git remote add tnguy-next-queue https://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue.git git fetch --no-tags tnguy-next-queue dev-queue git checkout 8ca07176ab00a6d06a9b254dcbb2514b4d607e9c # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=parisc SHELL=/bin/bash net/core/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/net/dsa.h:23, from net/core/flow_dissector.c:8: 410 | { | ^ include/net/switchdev.h:399:1: warning: 'switchdev_handle_fdb_del_to_device' declared 'static' but never defined [-Wunused-function] 399 | switchdev_handle_fdb_del_to_device(struct net_device *dev, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +410 include/net/switchdev.h 397 398 static inline int 399 switchdev_handle_fdb_del_to_device(struct net_device *dev, 400 const struct switchdev_notifier_fdb_info *fdb_info, 401 bool (*check_cb)(const struct net_device *dev), 402 bool (*foreign_dev_check_cb)(const struct net_device *dev, 403 const struct net_device *foreign_dev), 404 int (*del_cb)(struct net_device *dev, 405 const struct net_device *orig_dev, const void *ctx, 406 const struct switchdev_notifier_fdb_info *fdb_info), 407 int (*lag_del_cb)(struct net_device *dev, 408 const struct net_device *orig_dev, const void *ctx, 409 const struct switchdev_notifier_fdb_info *fdb_info)); 411 return 0; 412 } 413 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org