Hi Leonard, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on 1fe5b01262844be03de98afdd56d1d393df04d7e] url: https://github.com/0day-ci/linux/commits/Leonard-Crestez/tcp-Initial-supp... base: 1fe5b01262844be03de98afdd56d1d393df04d7e config: m68k-randconfig-s031-20211209 (https://download.01.org/0day-ci/archive/20211210/202112100225.hqdTG8c9-lk...) compiler: m68k-linux-gcc (GCC) 11.2.0 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: v0.6.4-dirty # https://github.com/0day-ci/linux/commit/7498e5058485276b294b76ec94a4769b3... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Leonard-Crestez/tcp-Initial-support-for-RFC5925-auth-option/20211208-194125 git checkout 7498e5058485276b294b76ec94a4769b36084115 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=m68k SHELL=/bin/bash net/ipv4/ 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/ipv4/tcp_authopt.c:250:42: sparse: expected unsigned int [usertype] mask net/ipv4/tcp_authopt.c:250:42: sparse: got restricted __be32 net/ipv4/tcp_authopt.c:252:65: sparse: sparse: restricted __be32 degrades to integer net/ipv4/tcp_authopt.c:279:42: sparse: sparse: incorrect type in initializer (different base types) @@ expected unsigned int [usertype] mask @@ got restricted __be32 @@ net/ipv4/tcp_authopt.c:279:42: sparse: expected unsigned int [usertype] mask net/ipv4/tcp_authopt.c:279:42: sparse: got restricted __be32 net/ipv4/tcp_authopt.c:281:34: sparse: sparse: restricted __be32 degrades to integer net/ipv4/tcp_authopt.c:281:72: sparse: sparse: restricted __be32 degrades to integer net/ipv4/tcp_authopt.c:394:23: sparse: sparse: incompatible types in comparison expression (different address spaces): net/ipv4/tcp_authopt.c:394:23: sparse: struct tcp_authopt_key_info [noderef] __rcu * net/ipv4/tcp_authopt.c:394:23: sparse: struct tcp_authopt_key_info * net/ipv4/tcp_authopt.c:396:23: sparse: sparse: incompatible types in comparison expression (different address spaces): net/ipv4/tcp_authopt.c:396:23: sparse: struct tcp_authopt_key_info [noderef] __rcu * net/ipv4/tcp_authopt.c:396:23: sparse: struct tcp_authopt_key_info * net/ipv4/tcp_authopt.c:420:25: sparse: sparse: incompatible types in comparison expression (different address spaces): net/ipv4/tcp_authopt.c:420:25: sparse: struct tcp_authopt_key_info [noderef] __rcu * net/ipv4/tcp_authopt.c:420:25: sparse: struct tcp_authopt_key_info * net/ipv4/tcp_authopt.c:560:20: sparse: sparse: incompatible types in comparison expression (different address spaces): net/ipv4/tcp_authopt.c:560:20: sparse: struct tcp_authopt_key_info [noderef] __rcu * net/ipv4/tcp_authopt.c:560:20: sparse: struct tcp_authopt_key_info * net/ipv4/tcp_authopt.c:579:13: sparse: sparse: incompatible types in comparison expression (different address spaces): net/ipv4/tcp_authopt.c:579:13: sparse: struct tcp_authopt_key_info [noderef] __rcu * net/ipv4/tcp_authopt.c:579:13: sparse: struct tcp_authopt_key_info * net/ipv4/tcp_authopt.c:580:17: sparse: sparse: incompatible types in comparison expression (different address spaces): net/ipv4/tcp_authopt.c:580:17: sparse: struct tcp_authopt_key_info [noderef] __rcu * net/ipv4/tcp_authopt.c:580:17: sparse: struct tcp_authopt_key_info * vim +250 net/ipv4/tcp_authopt.c 241 242 static bool tcp_authopt_key_match_skb_addr(struct tcp_authopt_key_info *key, 243 struct sk_buff *skb) 244 { 245 u16 keyaf = key->addr.ss_family; 246 struct iphdr *iph = (struct iphdr *)skb_network_header(skb); 247 248 if (keyaf == AF_INET && iph->version == 4) { 249 struct sockaddr_in *key_addr = (struct sockaddr_in *)&key->addr; 251 253 } else if (keyaf == AF_INET6 && iph->version == 6) { 254 struct ipv6hdr *ip6h = (struct ipv6hdr *)skb_network_header(skb); 255 struct sockaddr_in6 *key_addr = (struct sockaddr_in6 *)&key->addr; 256 257 return ipv6_prefix_equal(&ip6h->saddr, 258 &key_addr->sin6_addr, 259 key->prefixlen); 260 } 261 262 /* This actually happens with ipv6-mapped-ipv4-addresses 263 * IPv6 listen sockets will be asked to validate ipv4 packets. 264 */ 265 return false; 266 } 267 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org