[kbuild-all] [dsahern-linux:nvme-tcp-offload 13/15] drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp_rxtx.h:18:5: warning: no previous prototype for 'mlx5_nvmeotcp_get_headlen'

tree: https://github.com/dsahern/linux nvme-tcp-offload head: b9ae3391dc24a401030b31ad5363e0471ae386e0 commit: d30049b55af82c90853e517faa490bfa6125d19f [13/15] net/mlx5e: NVMEoTCP, data-path for DDP offload config: s390-defconfig (attached as .config) compiler: s390-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/dsahern/linux/commit/d30049b55af82c90853e517faa490bfa6... git remote add dsahern-linux https://github.com/dsahern/linux git fetch --no-tags dsahern-linux nvme-tcp-offload git checkout d30049b55af82c90853e517faa490bfa6125d19f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390 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 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c:51: 18 | int mlx5_nvmeotcp_get_headlen(struct mlx5_cqe64 *cqe, u32 cqe_bcnt) { return cqe_bcnt; } | ^~~~~~~~~~~~~~~~~~~~~~~~~ 20 | mlx5e_nvmeotcp_handle_rx_skb(struct net_device *netdev, struct sk_buff *skb, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/mlx5_nvmeotcp_get_headlen +18 drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp_rxtx.h 11 12 struct sk_buff* 13 mlx5e_nvmeotcp_handle_rx_skb(struct net_device *netdev, struct sk_buff *skb, 14 struct mlx5_cqe64 *cqe, u32 cqe_bcnt, bool linear); 15 16 int mlx5_nvmeotcp_get_headlen(struct mlx5_cqe64 *cqe, u32 cqe_bcnt); 17 #else 19 struct sk_buff* 21 struct mlx5_cqe64 *cqe, u32 cqe_bcnt, bool linear) 22 { return skb; } 23 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org