Hi Xuan, Thank you for the patch! Yet something to improve: [auto build test ERROR on net-next/master] url: https://github.com/0day-ci/linux/commits/Xuan-Zhuo/virtio-net-support-xdp... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git c7654495916e109f76a67fd3ae68f8fa70ab4faa config: i386-randconfig-a004-20210620 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/f5f1e60139e7c38fbb4ed58d503e89bbb... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Xuan-Zhuo/virtio-net-support-xdp-socket-zero-copy/20210617-033438 git checkout f5f1e60139e7c38fbb4ed58d503e89bbb26c1464 # save the attached .config to linux build tree make W=1 ARCH=i386 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 >>, old ones prefixed by <<): ERROR: modpost: missing MODULE_LICENSE() in drivers/net/virtio/xsk.o ERROR: modpost: "merge_drop_follow_bufs" [drivers/net/virtio/xsk.ko] undefined! ERROR: modpost: "virtnet_run_xdp" [drivers/net/virtio/xsk.ko] undefined! ERROR: modpost: "merge_receive_follow_bufs" [drivers/net/virtio/xsk.ko] undefined! ERROR: modpost: "virtnet_xsk_wakeup" [drivers/net/virtio/virtio_net.ko] undefined! ERROR: modpost: "receive_xsk" [drivers/net/virtio/virtio_net.ko] undefined! ERROR: modpost: "add_recvbuf_xsk" [drivers/net/virtio/virtio_net.ko] undefined! ERROR: modpost: "virtnet_poll_xsk" [drivers/net/virtio/virtio_net.ko] undefined! ERROR: modpost: "virtnet_xsk_ctx_rx_copy" [drivers/net/virtio/virtio_net.ko] undefined! ERROR: modpost: "virtnet_xsk_complete" [drivers/net/virtio/virtio_net.ko] undefined! WARNING: modpost: suppressed 1 unresolved symbol warnings because there were too many) --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org