tree:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git arm-kill-set_fs-4
head:   1d3fb77b2dd5e198884e0ebf81087989dfd6eff8
commit: 3c051fc857c56aa39bcfdebcb819e1ed5d2c9a8b [11/37] syscalls: simplify compat sys_kexec_load
config: x86_64-randconfig-a001-20200917 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 1321160a26e7e489baf9b10d6de90a342f898960)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        git checkout 3c051fc857c56aa39bcfdebcb819e1ed5d2c9a8b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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: __x32_sys_kexec_load
   >>> referenced by syscall_x32.c
   >>> entry/syscall_x32.o:(x32_sys_call_table) in archive arch/x86/built-in.a

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