Hi WingMan, FYI, the error/warning still remains. tree: git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git ti-rt-linux-5.10.y head: 0c67d996db8f3c9149598bc98657ae28fee22208 commit: e355bf097bb11257afeadf6665e51f224eeb93a7 [7473/10206] net: packet: Pass on redundant net info in packet_recvmsg config: alpha-randconfig-r011-20211115 (attached as .config) compiler: alpha-linux-gcc (GCC) 11.2.0 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-rt-linux-5.10.y git checkout e355bf097bb11257afeadf6665e51f224eeb93a7 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=alpha SHELL=/bin/bash 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 include/net/ipv6.h:12, from include/linux/sunrpc/clnt.h:28, from include/linux/nfs_fs.h:32, from init/do_mounts.c:23: include/net/sock.h: In function 'sock_recv_redundant_info': 2523 | put_cmsg(msg, SOL_SOCKET, SCM_REDUNDANT, sizeof(*sred), sred); | ^~~~~~~~~~~~~ include/net/sock.h:2523:43: note: each undeclared identifier is reported only once for each function it appears in -- In file included from fs/io_uring.c:64: include/net/sock.h: In function 'sock_recv_redundant_info': 2523 | put_cmsg(msg, SOL_SOCKET, SCM_REDUNDANT, sizeof(*sred), sred); | ^~~~~~~~~~~~~ include/net/sock.h:2523:43: note: each undeclared identifier is reported only once for each function it appears in fs/io_uring.c: In function 'io_prep_async_work': fs/io_uring.c:1431:29: warning: variable 'id' set but not used [-Wunused-but-set-variable] 1431 | struct io_identity *id; | ^~ -- In file included from include/linux/tcp.h:19, from include/linux/ipv6.h:87, from include/net/addrconf.h:50, from lib/vsprintf.c:40: include/net/sock.h: In function 'sock_recv_redundant_info': 2523 | put_cmsg(msg, SOL_SOCKET, SCM_REDUNDANT, sizeof(*sred), sred); | ^~~~~~~~~~~~~ include/net/sock.h:2523:43: note: each undeclared identifier is reported only once for each function it appears in lib/vsprintf.c: In function 'va_format': lib/vsprintf.c:1663:9: warning: function 'va_format' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 1663 | buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va); | ^~~ -- In file included from include/linux/skmsg.h:12, from kernel/bpf/btf.c:22: include/net/sock.h: In function 'sock_recv_redundant_info': 2523 | put_cmsg(msg, SOL_SOCKET, SCM_REDUNDANT, sizeof(*sred), sred); | ^~~~~~~~~~~~~ include/net/sock.h:2523:43: note: each undeclared identifier is reported only once for each function it appears in kernel/bpf/btf.c: In function 'btf_seq_show': kernel/bpf/btf.c:5328:29: warning: function 'btf_seq_show' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 5328 | seq_vprintf((struct seq_file *)show->target, fmt, args); | ^~~~~~~~ kernel/bpf/btf.c: In function 'btf_snprintf_show': kernel/bpf/btf.c:5365:9: warning: function 'btf_snprintf_show' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 5365 | len = vsnprintf(show->target, ssnprintf->len_left, fmt, args); | ^~~ vim +/SCM_REDUNDANT +2523 include/net/sock.h 2514 2515 DECLARE_STATIC_KEY_FALSE(tcp_rx_skb_cache_key); 2516 static inline void sock_recv_redundant_info(struct msghdr *msg, struct sock *sk, 2517 struct sk_buff *skb) 2518 { 2519 struct skb_redundant_info *sred; 2520 2521 sred = skb_redinfo(skb); 2522 if (sred->lsdu_size) 2524 } 2525 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org