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: ca222ae72ea37d74141ed53deaa0a07263ef34e8 commit: 37ab3ad1acdc652a6694e6f45e67767a8a80592b [8676/13425] net: socket: pass on redundant net info to sock_recv_errqueue config: parisc-defconfig (attached as .config) compiler: hppa-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 37ab3ad1acdc652a6694e6f45e67767a8a80592b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc 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/mm.h:99, from include/linux/bvec.h:13, from include/linux/skbuff.h:17, from include/linux/ip.h:16, from include/net/ip.h:22, from include/linux/errqueue.h:6, from net/core/sock.c:91: include/asm-generic/pgtable.h: In function 'pte_clear_not_present_full': arch/parisc/include/asm/pgtable.h:91:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable] 91 | pte_t old_pte; \ | ^~~~~~~ arch/parisc/include/asm/pgtable.h:316:34: note: in expansion of macro 'set_pte_at' 316 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0)) | ^~~~~~~~~~ include/asm-generic/pgtable.h:201:2: note: in expansion of macro 'pte_clear' 201 | pte_clear(mm, address, ptep); | ^~~~~~~~~ include/asm-generic/pgtable.h: In function '__ptep_modify_prot_commit': arch/parisc/include/asm/pgtable.h:91:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable] 91 | pte_t old_pte; \ | ^~~~~~~ include/asm-generic/pgtable.h:629:2: note: in expansion of macro 'set_pte_at' 629 | set_pte_at(vma->vm_mm, addr, ptep, pte); | ^~~~~~~~~~ In file included from include/net/inet_sock.h:22, from include/net/ip.h:27, from include/linux/errqueue.h:6, from net/core/sock.c:91: include/net/sock.h: In function 'sock_recv_redundant_info': include/net/sock.h:2457:29: error: 'SCM_REDUNDANT' undeclared (first use in this function) 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/core/sock.c: In function 'sock_recv_errqueue': 3092 | put_cmsg(msg, SOL_SOCKET, SCM_REDUNDANT, sizeof(*sred), sred); | ^~~~~~~~~~~~~ vim +/SCM_REDUNDANT +3092 net/core/sock.c 3066 3067 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, 3068 int level, int type) 3069 { 3070 struct sock_exterr_skb *serr; 3071 struct sk_buff *skb; 3072 int copied, err; 3073 struct skb_redundant_info *sred; 3074 3075 err = -EAGAIN; 3076 skb = sock_dequeue_err_skb(sk); 3077 if (skb == NULL) 3078 goto out; 3079 3080 copied = skb->len; 3081 if (copied > len) { 3082 msg->msg_flags |= MSG_TRUNC; 3083 copied = len; 3084 } 3085 err = skb_copy_datagram_msg(skb, 0, msg, copied); 3086 if (err) 3087 goto out_free_skb; 3088 3089 sock_recv_timestamp(msg, sk, skb); 3090 3091 sred = skb_redinfo(skb); 3093 3094 serr = SKB_EXT_ERR(skb); 3095 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); 3096 3097 msg->msg_flags |= MSG_ERRQUEUE; 3098 err = copied; 3099 3100 out_free_skb: 3101 kfree_skb(skb); 3102 out: 3103 return err; 3104 } 3105 EXPORT_SYMBOL(sock_recv_errqueue); 3106 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org