Hi WingMan, FYI, the error/warning still remains. tree: git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git ti-linux-5.4.y head: 26692c45bd67ced28dc36459ce28adea53187341 commit: e804afb5449b93d5b543a1685b0b2fab328873fc [8675/13391] net: packet: pass on redundant net info in packet_recvmsg config: alpha-randconfig-r011-20210218 (attached as .config) compiler: alpha-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 remote add ti git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git git fetch --no-tags ti ti-linux-5.4.y git checkout e804afb5449b93d5b543a1685b0b2fab328873fc # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=alpha 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/net/cls_cgroup.h:14, from net/socket.c:95: 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/socket.c: In function '__sys_getsockopt': net/socket.c:2113:6: warning: variable 'max_optlen' set but not used [-Wunused-but-set-variable] 2113 | int max_optlen; | ^~~~~~~~~~ -- In file included from net/appletalk/aarp.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 -- In file included from include/linux/atmdev.h:13, from net/atm/resources.c:15: 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/atm/resources.c: At top level: net/atm/resources.c:446:7: warning: no previous prototype for 'atm_dev_seq_start' [-Wmissing-prototypes] 446 | void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos) | ^~~~~~~~~~~~~~~~~ net/atm/resources.c:452:6: warning: no previous prototype for 'atm_dev_seq_stop' [-Wmissing-prototypes] 452 | void atm_dev_seq_stop(struct seq_file *seq, void *v) | ^~~~~~~~~~~~~~~~ net/atm/resources.c:457:7: warning: no previous prototype for 'atm_dev_seq_next' [-Wmissing-prototypes] 457 | void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) | ^~~~~~~~~~~~~~~~ -- In file included from include/net/bluetooth/bluetooth.h:29, from net/bluetooth/l2cap_core.c:37: 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/bluetooth/l2cap_core.c: In function 'l2cap_connect': net/bluetooth/l2cap_core.c:3872:41: warning: comparison is always false due to limited range of data type [-Wtype-limits] 3872 | if (scid < L2CAP_CID_DYN_START || scid > L2CAP_CID_DYN_END) { | ^ -- In file included from include/net/bluetooth/bluetooth.h:29, from net/bluetooth/smp.c:32: 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/bluetooth/smp.c: In function 'smp_irk_matches': net/bluetooth/smp.c:505:18: warning: variable 'smp' set but not used [-Wunused-but-set-variable] 505 | struct smp_dev *smp; | ^~~ net/bluetooth/smp.c: In function 'smp_generate_rpa': net/bluetooth/smp.c:526:18: warning: variable 'smp' set but not used [-Wunused-but-set-variable] 526 | struct smp_dev *smp; | ^~~ -- In file included from net/nfc/nci/../nfc.h:14, from net/nfc/nci/hci.c:13: 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/nfc/nci/hci.c: In function 'nci_hci_resp_received': net/nfc/nci/hci.c:369:5: warning: variable 'status' set but not used [-Wunused-but-set-variable] 369 | u8 status = result; | ^~~~~~ 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