tree: git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git ti-rt-linux-5.10.y head: 890b86772cff397e32c66ea6528fe8702d7e44a5 commit: b98f7ec080e0de442e0be84994ec8d26bdc39eeb [7474/10054] net: socket: Forward extra timestamp of received skb to user space config: mips-randconfig-r012-20211019 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d245f2e8597bfb52c34810a328d42b990e4af1a4) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu 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 b98f7ec080e0de442e0be84994ec8d26bdc39eeb # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips 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 net/socket.c:95: In file included from include/net/cls_cgroup.h:14: include/net/sock.h:2525:29: error: use of undeclared identifier 'SCM_REDUNDANT' put_cmsg(msg, SOL_SOCKET, SCM_REDUNDANT, sizeof(*sred), sred); ^ SCM_RED_TIMESTAMPING, sizeof(tss), &tss); ^ net/socket.c:2174:6: warning: variable 'max_optlen' set but not used [-Wunused-but-set-variable] int max_optlen; ^ 1 warning and 2 errors generated. vim +/SCM_RED_TIMESTAMPING +861 net/socket.c 845 846 void __sock_recv_redinfo_timestamp(struct msghdr *msg, struct sock *sk, 847 struct sk_buff *skb) 848 { 849 struct scm_timestamping_internal tss; 850 int empty = 1; 851 struct skb_shared_hwtstamps *red_shhwtstamps = 852 skb_redinfo_hwtstamps(skb); 853 854 if (red_shhwtstamps && 855 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && 856 ktime_to_timespec64_cond(red_shhwtstamps->hwtstamp, tss.ts + 2)) 857 empty = 0; 858 859 if (!empty) 860 put_cmsg(msg, SOL_SOCKET, 862 } 863 EXPORT_SYMBOL_GPL(__sock_recv_redinfo_timestamp); 864 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org