Hi Jian, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on net-next/master] url: https://github.com/0day-ci/linux/commits/Jian-Shen/net-extend-netdev-feat... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 5e437416ff66981d8154687cfdf7de50b1d82bfc config: nios2-defconfig (attached as .config) compiler: nios2-linux-gcc (GCC) 9.3.0 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://github.com/0day-ci/linux/commit/378137e43ebe9f450b0ab5be3b32ec429... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Jian-Shen/net-extend-netdev-features/20210710-174828 git checkout 378137e43ebe9f450b0ab5be3b32ec4295a6806f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nios2 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/linux/skbuff.h:32, from include/net/net_namespace.h:39, from include/linux/inet.h:42, from net/sunrpc/svcsock.c:30: include/linux/netdev_features.h: In function 'netdev_features_empty': include/linux/netdev_features.h:334:11: error: 'return' with a value, in function returning void [-Werror=return-type] 334 | return false; | ^~~~~ include/linux/netdev_features.h:328:20: note: declared here 328 | static inline void netdev_features_empty(netdev_features_t *src) | ^~~~~~~~~~~~~~~~~~~~~ include/linux/netdev_features.h:336:9: error: 'return' with a value, in function returning void [-Werror=return-type] 336 | return true; | ^~~~ include/linux/netdev_features.h:328:20: note: declared here 328 | static inline void netdev_features_empty(netdev_features_t *src) | ^~~~~~~~~~~~~~~~~~~~~ In file included from include/net/inet_sock.h:19, from include/linux/udp.h:16, from net/sunrpc/svcsock.c:31: include/linux/netdevice.h: In function 'netif_elide_gro': include/linux/netdevice.h:2254:22: error: invalid operands to binary & (have 'const netdev_features_t *' {aka 'const long long unsigned int *'} and 'long long unsigned int') 2254 | if (!(dev->features & NETIF_F_GRO) || dev->xdp_prog) | ~~~ ^ | | | const netdev_features_t * {aka const long long unsigned int *} In file included from net/sunrpc/svcsock.c:61: net/sunrpc/sunrpc.h: In function 'sock_is_loopback': 47 | (dst->dev->features & NETIF_F_LOOPBACK)) | ~~~ ^ | | | netdev_features_t * {aka long long unsigned int *} cc1: some warnings being treated as errors vim +47 net/sunrpc/sunrpc.h 6951867b996706 Benny Halevy 2009-09-10 39 ef11ce24875a8a NeilBrown 2014-05-12 40 static inline int sock_is_loopback(struct sock *sk) ef11ce24875a8a NeilBrown 2014-05-12 41 { ef11ce24875a8a NeilBrown 2014-05-12 42 struct dst_entry *dst; ef11ce24875a8a NeilBrown 2014-05-12 43 int loopback = 0; ef11ce24875a8a NeilBrown 2014-05-12 44 rcu_read_lock(); ef11ce24875a8a NeilBrown 2014-05-12 45 dst = rcu_dereference(sk->sk_dst_cache); ef11ce24875a8a NeilBrown 2014-05-12 46 if (dst && dst->dev && ef11ce24875a8a NeilBrown 2014-05-12 @47 (dst->dev->features & NETIF_F_LOOPBACK)) ef11ce24875a8a NeilBrown 2014-05-12 48 loopback = 1; ef11ce24875a8a NeilBrown 2014-05-12 49 rcu_read_unlock(); ef11ce24875a8a NeilBrown 2014-05-12 50 return loopback; ef11ce24875a8a NeilBrown 2014-05-12 51 } ef11ce24875a8a NeilBrown 2014-05-12 52 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org