Hi Huacai,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   449dc8c97089a6e09fb2dac4d92b1b7ac0eb7c1e
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@intel.com>

All errors (new ones prefixed by >>):

>> arch/mips/kvm/vz.c:32:10: fatal error: loongson_regs.h: No such file or directory
      32 | #include "loongson_regs.h"
         |          ^~~~~~~~~~~~~~~~~
   compilation terminated.

vim +32 arch/mips/kvm/vz.c

    30	
    31	#include "interrupt.h"
  > 32	#include "loongson_regs.h"
    33	

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