root@kvm-node:/usr/src/linux# make
  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  CHK     include/generated/bounds.h
  CHK     include/generated/timeconst.h
  CHK     include/generated/asm-offsets.h
  CALL    scripts/checksyscalls.sh
  CHK     include/generated/compile.h
  CC      arch/arm64/xen/../../arm/xen/grant-table.o
In file included from ./arch/arm64/include/../../arm/include/asm/xen/page.h:5:0,
                 from ./arch/arm64/include/asm/xen/page.h:1,
                 from include/xen/page.h:28,
                 from arch/arm64/xen/../../arm/xen/grant-table.c:33:
./arch/arm64/include/asm/pgtable.h: In function ‘set_pte_at’:
./arch/arm64/include/asm/pgtable.h:281:3: error: implicit declaration of function ‘BUILD_BUG_ON_INVALID’ [-Werror=implicit-function-declaration]
   VM_WARN_ONCE(!pte_young(pte),
   ^
cc1: some warnings being treated as errors
make[1]: *** [arch/arm64/xen/../../arm/xen/grant-table.o] Error 1
make: *** [arch/arm64/xen] Error 2