tree: git://git.infradead.org/users/hch/misc.git set_fs-net-tunnel head: 75b3a7d2e1d57c6ee6426093ca75615a02ddd26a commit: f10c33a48f618cfcf62ad359952106b0881abc20 [1/2] ipv4: use symbol_get to access ipip symbols config: nios2-defconfig (attached as .config) compiler: nios2-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout f10c33a48f618cfcf62ad359952106b0881abc20 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=nios2 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): In file included from include/net/dst_metadata.h:6, from net/core/flow_dissector.c:9: 498 | struct net_device *ipip_tunnel_ctl(struct net *net, struct vifctl *v, int cmd); | ^~~~~~ vim +498 include/net/ip_tunnels.h 497 499 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org