Hi WingMan, FYI, the error/warning still remains. tree: git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git ti-rt-linux-5.4.y head: 872a510b1bbcab3969980f7fdaa664d7818c0210 commit: e804afb5449b93d5b543a1685b0b2fab328873fc [9147/9607] net: packet: pass on redundant net info in packet_recvmsg config: sparc-defconfig (attached as .config) compiler: sparc-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 git checkout e804afb5449b93d5b543a1685b0b2fab328873fc # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sparc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/linux/tcp.h:19, from include/linux/ipv6.h:87, from net//core/pktgen.c:146: include/net/sock.h: In function 'sock_recv_redundant_info': 2457 | put_cmsg(msg, SOL_SOCKET, SCM_REDUNDANT, sizeof(*sred), sred); | ^~~~~~~~~~~~~ include/net/sock.h:2457:29: note: each undeclared identifier is reported only once for each function it appears in -- In file included from include/linux/mroute_base.h:8, from include/linux/mroute.h:10, from net//ipv4/route.c:82: include/net/sock.h: In function 'sock_recv_redundant_info': 2457 | put_cmsg(msg, SOL_SOCKET, SCM_REDUNDANT, sizeof(*sred), sred); | ^~~~~~~~~~~~~ include/net/sock.h:2457:29: note: each undeclared identifier is reported only once for each function it appears in net//ipv4/route.c: In function 'ip_rt_send_redirect': net//ipv4/route.c:875:6: warning: variable 'log_martians' set but not used [-Wunused-but-set-variable] 875 | int log_martians; | ^~~~~~~~~~~~ -- In file included from include/linux/tcp.h:19, from include/net/tcp.h:20, from include/linux/netfilter_ipv6.h:11, from net//ipv6/af_inet6.c:41: include/net/sock.h: In function 'sock_recv_redundant_info': 2457 | put_cmsg(msg, SOL_SOCKET, SCM_REDUNDANT, sizeof(*sred), sred); | ^~~~~~~~~~~~~ include/net/sock.h:2457:29: note: each undeclared identifier is reported only once for each function it appears in net//ipv6/af_inet6.c: At top level: net//ipv6/af_inet6.c:569:5: warning: no previous prototype for 'inet6_sendmsg' [-Wmissing-prototypes] 569 | int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) | ^~~~~~~~~~~~~ net//ipv6/af_inet6.c:582:5: warning: no previous prototype for 'inet6_recvmsg' [-Wmissing-prototypes] 582 | int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, | ^~~~~~~~~~~~~ -- In file included from include/net/inet_sock.h:22, from include/net/ip.h:27, from net//ipv6/ip6_fib.c:28: include/net/sock.h: In function 'sock_recv_redundant_info': 2457 | put_cmsg(msg, SOL_SOCKET, SCM_REDUNDANT, sizeof(*sred), sred); | ^~~~~~~~~~~~~ include/net/sock.h:2457:29: note: each undeclared identifier is reported only once for each function it appears in net//ipv6/ip6_fib.c: In function 'fib6_add': net//ipv6/ip6_fib.c:1307:25: warning: variable 'pn' set but not used [-Wunused-but-set-variable] 1307 | struct fib6_node *fn, *pn = NULL; | ^~ -- In file included from include/net/inet_sock.h:22, from include/linux/udp.h:16, from net//sunrpc/svcsock.c:31: include/net/sock.h: In function 'sock_recv_redundant_info': 2457 | put_cmsg(msg, SOL_SOCKET, SCM_REDUNDANT, sizeof(*sred), sred); | ^~~~~~~~~~~~~ include/net/sock.h:2457:29: note: each undeclared identifier is reported only once for each function it appears in net//sunrpc/svcsock.c: In function 'svc_udp_init': net//sunrpc/svcsock.c:677:6: warning: variable 'err' set but not used [-Wunused-but-set-variable] 677 | int err, level, optname, one = 1; | ^~~ git remote add ti git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git git fetch --no-tags ti ti-rt-linux-5.4.y git checkout e804afb5449b93d5b543a1685b0b2fab328873fc vim +/SCM_REDUNDANT +2457 include/net/sock.h 2449 2450 static inline void sock_recv_redundant_info(struct msghdr *msg, struct sock *sk, 2451 struct sk_buff *skb) 2452 { 2453 struct skb_redundant_info *sred; 2454 2455 sred = skb_redinfo(skb); 2456 if (sred->lsdu_size) 2458 } 2459 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org