Hi Alexander, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Alexander-Lobakin/xsk-build-skb-... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: riscv-randconfig-r014-20210216 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) 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 # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/0day-ci/linux/commit/ab71cd66e7a92a19ed9d78686970702fb... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Alexander-Lobakin/xsk-build-skb-by-page-aka-generic-zerocopy-xmit/20210216-194634 git checkout ab71cd66e7a92a19ed9d78686970702fbbf0cd09 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from net/8021q/vlanproc.c:26: include/linux/netdevice.h:1566:1: error: static_assert failed due to requirement 'sizeof(unsigned int) * 8 <= NETDEV_PRIV_FLAG_COUNT' "sizeof(netdev_priv_flags_t) * BITS_PER_BYTE <= NETDEV_PRIV_FLAG_COUNT" static_assert(sizeof(netdev_priv_flags_t) * BITS_PER_BYTE <= ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:77:34: note: expanded from macro 'static_assert' #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:78:41: note: expanded from macro '__static_assert' #define __static_assert(expr, msg, ...) _Static_assert(expr, msg) ^ ~~~~ (int)(vlan->flags & 1), vlandev->priv_flags); ^~~~~~~~~~~~~~~~~~~ net/8021q/vlanproc.c:284:22: warning: format specifies type 'unsigned short' but the argument has type 'int' [-Wformat] mp->priority, ((mp->vlan_qos >> 13) & 0x7)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2 warnings and 1 error generated. vim +257 net/8021q/vlanproc.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 240 ^1da177e4c3f41 Linus Torvalds 2005-04-16 241 static int vlandev_seq_show(struct seq_file *seq, void *offset) ^1da177e4c3f41 Linus Torvalds 2005-04-16 242 { ^1da177e4c3f41 Linus Torvalds 2005-04-16 243 struct net_device *vlandev = (struct net_device *) seq->private; 7da82c06ded105 Jiri Pirko 2011-12-08 244 const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 28172739f0a276 Eric Dumazet 2010-07-07 245 struct rtnl_link_stats64 temp; be1f3c2c027cc5 Ben Hutchings 2010-06-08 246 const struct rtnl_link_stats64 *stats; be1f3c2c027cc5 Ben Hutchings 2010-06-08 247 static const char fmt64[] = "%30s %12llu\n"; ^1da177e4c3f41 Linus Torvalds 2005-04-16 248 int i; ^1da177e4c3f41 Linus Torvalds 2005-04-16 249 26a25239d7a660 Joonwoo Park 2008-07-08 250 if (!is_vlan_dev(vlandev)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 251 return 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 252 28172739f0a276 Eric Dumazet 2010-07-07 253 stats = dev_get_stats(vlandev, &temp); 2029cc2c84fb11 Patrick McHardy 2008-01-21 254 seq_printf(seq, 2029cc2c84fb11 Patrick McHardy 2008-01-21 255 "%s VID: %d REORDER_HDR: %i dev->priv_flags: %hx\n", 7da82c06ded105 Jiri Pirko 2011-12-08 256 vlandev->name, vlan->vlan_id, 7da82c06ded105 Jiri Pirko 2011-12-08 @257 (int)(vlan->flags & 1), vlandev->priv_flags); --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org