Hi Tanner, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/Tanner-Love/virtio_net-add-optio... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 0c33795231bff5df410bd405b569c66851e92d4b config: s390-randconfig-s031-20210617 (attached as .config) compiler: s390-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 # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://github.com/0day-ci/linux/commit/b03a1eb684b925a09ae011d0e620d98eb... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Tanner-Love/virtio_net-add-optional-flow-dissection-in-virtio_net_hdr_to_skb/20210617-082208 git checkout b03a1eb684b925a09ae011d0e620d98ebf3b0abd # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) net/core/flow_dissector.c:882:40: sparse: expected restricted __virtio16 [assigned] [usertype] hdr_len net/core/flow_dissector.c:882:40: sparse: got unsigned short net/core/flow_dissector.c:884:41: sparse: expected restricted __virtio16 [assigned] [usertype] gso_size net/core/flow_dissector.c:884:41: sparse: got unsigned short net/core/flow_dissector.c:886:43: sparse: expected restricted __virtio16 [assigned] [usertype] csum_start net/core/flow_dissector.c:886:43: sparse: got unsigned short net/core/flow_dissector.c:888:44: sparse: expected restricted __virtio16 [assigned] [usertype] csum_offset net/core/flow_dissector.c:888:44: sparse: got unsigned short vim +882 net/core/flow_dissector.c 866 867 bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx, 868 __be16 proto, int nhoff, int hlen, unsigned int flags, 869 const struct virtio_net_hdr *vhdr, 870 bool vhdr_is_little_endian) 871 { 872 struct bpf_flow_keys *flow_keys = ctx->flow_keys; 873 u32 result; 874 875 /* vnet hdr is either machine endian (virtio spec < v1) or le (>= v1) */ 876 #if defined(__BIG_ENDIAN_BITFIELD) 877 struct virtio_net_hdr vnet_hdr_local; 878 879 if (vhdr && vhdr_is_little_endian) { 880 vnet_hdr_local.flags = vhdr->flags; 881 vnet_hdr_local.gso_type = vhdr->gso_type; 883 vhdr->hdr_len); 885 vhdr->gso_size); 887 vhdr->csum_start); 889 vhdr->csum_offset); 890 vhdr = &vnet_hdr_local; 891 } 892 #endif 893 894 /* Pass parameters to the BPF program */ 895 memset(flow_keys, 0, sizeof(*flow_keys)); 896 flow_keys->n_proto = proto; 897 flow_keys->nhoff = nhoff; 898 flow_keys->thoff = flow_keys->nhoff; 899 flow_keys->vhdr = vhdr; 900 901 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG != 902 (int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG); 903 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL != 904 (int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL); 905 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP != 906 (int)FLOW_DISSECTOR_F_STOP_AT_ENCAP); 907 flow_keys->flags = flags; 908 909 result = bpf_prog_run_pin_on_cpu(prog, ctx); 910 911 flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen); 912 flow_keys->thoff = clamp_t(u16, flow_keys->thoff, 913 flow_keys->nhoff, hlen); 914 915 return result == BPF_OK; 916 } 917 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org