Hi Peng, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on kvm/linux-next] [also build test ERROR on arm64/for-next/core v5.8 next-20200813] [cannot apply to kvmarm/next] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Peng-Liang/kvm-arm64-emulate-ID-... base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next config: x86_64-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # save the attached .config to linux build tree make W=1 ARCH=x86_64 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 <command-line>:32: 1277 | uint64_t sys_id; | ^~~~~~~~ ./usr/include/linux/kvm.h:1278:2: error: unknown type name 'uint64_t' 1278 | uint64_t sys_val; | ^~~~~~~~ ./usr/include/linux/kvm.h:1283:2: error: unknown type name 'uint64_t' 1283 | uint64_t num; | ^~~~~~~~ --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org