tree:   https://github.com/congwang/linux.git sockmap3
head:   e5d5ad90185716657e7f42a34f50a192c9a1f265
commit: d7a8a50ed800a43ecd8eed96293aa5015f9fd7be [1/10] sock_map: extend support beyond INET
config: arm-randconfig-r002-20210421 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d87b9b81ccb95217181ce75515c6c68bbb408ca4)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/congwang/linux/commit/d7a8a50ed800a43ecd8eed96293aa5015f9fd7be
        git remote add congwang https://github.com/congwang/linux.git
        git fetch --no-tags congwang sockmap3
        git checkout d7a8a50ed800a43ecd8eed96293aa5015f9fd7be
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: bpf_fd_reuseport_array_update_elem
   >>> referenced by syscall.c
   >>> bpf/syscall.o:(bpf_map_update_value) in archive kernel/built-in.a
--
>> ld.lld: error: undefined symbol: bpf_fd_reuseport_array_lookup_elem
   >>> referenced by syscall.c
   >>> bpf/syscall.o:(bpf_map_copy_value) in archive kernel/built-in.a
--
>> ld.lld: error: undefined symbol: bpf_sk_reuseport_detach
   >>> referenced by sock_reuseport.c
   >>> core/sock_reuseport.o:(reuseport_detach_sock) in archive net/built-in.a

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org