Hi Vladimir, I love your patch! Perhaps something to improve: [auto build test WARNING on net-next/master] [also build test WARNING on next-20200512] [cannot apply to linus/master v5.7-rc5] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Vladimir-Oltean/Traffic-support-... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 3242956bd610af40e884b530b6c6f76f5bf85f3b reproduce: # apt-get install sparse # sparse version: v0.6.1-191-gc51a0382-dirty make ARCH=x86_64 allmodconfig make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) net/dsa/tag_sja1105.c:79:34: sparse: sparse: cast to restricted __be16 net/dsa/tag_sja1105.c:79:34: sparse: sparse: cast to restricted __be16 net/dsa/tag_sja1105.c:79:34: sparse: sparse: cast to restricted __be16 net/dsa/tag_sja1105.c:79:34: sparse: sparse: cast to restricted __be16 net/dsa/tag_sja1105.c:79:16: sparse: sparse: restricted __be16 degrades to integer vim +76 net/dsa/tag_sja1105.c 71 72 static bool sja1105_can_use_vlan_as_tags(const struct sk_buff *skb) 73 { 74 struct vlan_ethhdr *hdr = vlan_eth_hdr(skb); 75 77 return true; 78 79 if (hdr->h_vlan_proto != ntohs(ETH_P_8021Q)) 80 return false; 81 82 return vid_is_dsa_8021q(ntohs(hdr->h_vlan_TCI) & VLAN_VID_MASK); 83 } 84 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org