Hi "Toke, I love your patch! Yet something to improve: [auto build test ERROR on bpf/master] url: https://github.com/0day-ci/linux/commits/Toke-H-iland-J-rgensen/bpf-Rewor... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master config: x86_64-randconfig-a016-20201019 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 094e9f4779eb9b5c6a49014f2f80b8cbb833572f) 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://github.com/0day-ci/linux/commit/250f45235b06a53ae71587457c94d9c3a... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Toke-H-iland-J-rgensen/bpf-Rework-bpf_redirect_neigh-to-allow-supplying-nexthop-from-caller/20201020-000711 git checkout 250f45235b06a53ae71587457c94d9c3a3a99f9a # 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 error/warnings (new ones prefixed by >>): struct net_device *dev, struct bpf_nh_params *nh) ^ net/core/filter.c:2267:76: note: previous declaration is here static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev, ^ struct net_device *dev, struct bpf_nh_params *nh) ^ 1 warning and 1 error generated. vim +/dev +2268 net/core/filter.c 2225 2226 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev, 2227 struct bpf_nh_params *nh) 2228 { 2229 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 2230 struct net *net = dev_net(dev); 2231 int err, ret = NET_XMIT_DROP; 2232 2233 if (!nh) { 2234 struct dst_entry *dst; 2235 struct flowi6 fl6 = { 2236 .flowi6_flags = FLOWI_FLAG_ANYSRC, 2237 .flowi6_mark = skb->mark, 2238 .flowlabel = ip6_flowinfo(ip6h), 2239 .flowi6_oif = dev->ifindex, 2240 .flowi6_proto = ip6h->nexthdr, 2241 .daddr = ip6h->daddr, 2242 .saddr = ip6h->saddr, 2243 }; 2244 2245 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL); 2246 if (IS_ERR(dst)) 2247 goto out_drop; 2248 2249 skb_dst_set(skb, dst); 2250 } else if (nh->nh_family != AF_INET6) { 2251 goto out_drop; 2252 } 2253 2254 err = bpf_out_neigh_v6(net, skb, dev, nh); 2255 if (unlikely(net_xmit_eval(err))) 2256 dev->stats.tx_errors++; 2257 else 2258 ret = NET_XMIT_SUCCESS; 2259 goto out_xmit; 2260 out_drop: 2261 dev->stats.tx_errors++; 2262 kfree_skb(skb); 2263 out_xmit: 2264 return ret; 2265 } 2266 #else 2267 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev, 2269 { 2270 kfree_skb(skb); 2271 return NET_XMIT_DROP; 2272 } 2273 #endif /* CONFIG_IPV6 */ 2274 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org