Hi Huacai, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 30185b69a2d533c4ba6ca926b8390ce7de495e29 commit: 7f2a83f1c2a941ebfee53f504ed5fdbc61cfb333 KVM: MIPS: Add CPUCFG emulation for Loongson-3 date: 9 weeks ago config: mips-randconfig-r024-20200808 (attached as .config) compiler: mips64el-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 checkout 7f2a83f1c2a941ebfee53f504ed5fdbc61cfb333 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 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 >>): 32 | #include "loongson_regs.h" | ^~~~~~~~~~~~~~~~~ compilation terminated. vim +32 arch/mips/kvm/vz.c 30 31 #include "interrupt.h" 33 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org