tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 3d5895cd351757f69c9a66fb5fc8cf19f454d773 commit: 7319a1cc3ca9f719e4ef1b1882f6fdb57d0719b8 net/mlx5e: TC, Refactor tc update skb function date: 4 months ago config: x86_64-randconfig-r026-20210722 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9625ca5b602616b2f5584e8a49ba93c52c141e40) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 7319a1cc3ca9f719e4ef1b1882f6fdb57d0719b8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>): u32 reg_c0, reg_c1; ^ 1 warning generated. vim +/reg_c1 +653 drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c 645 646 bool mlx5e_rep_tc_update_skb(struct mlx5_cqe64 *cqe, 647 struct sk_buff *skb, 648 struct mlx5e_tc_update_priv *tc_priv) 649 { 650 struct mlx5_mapped_obj mapped_obj; 651 struct mlx5_eswitch *esw; 652 struct mlx5e_priv *priv; 654 int err; 655 656 reg_c0 = (be32_to_cpu(cqe->sop_drop_qpn) & MLX5E_TC_FLOW_ID_MASK); 657 if (!reg_c0 || reg_c0 == MLX5_FS_DEFAULT_FLOW_TAG) 658 return true; 659 660 /* If reg_c0 is not equal to the default flow tag then skb->mark 661 * is not supported and must be reset back to 0. 662 */ 663 skb->mark = 0; 664 665 reg_c1 = be32_to_cpu(cqe->ft_metadata); 666 667 priv = netdev_priv(skb->dev); 668 esw = priv->mdev->priv.eswitch; 669 err = mapping_find(esw->offloads.reg_c0_obj_pool, reg_c0, &mapped_obj); 670 if (err) { 671 netdev_dbg(priv->netdev, 672 "Couldn't find mapped object for reg_c0: %d, err: %d\n", 673 reg_c0, err); 674 return false; 675 } 676 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org