CC      arch/x86/lib/csum-wrappers_64.o
  CC      arch/x86/lib/delay.o
  AS      arch/x86/lib/getuser.o
  AS      arch/x86/lib/memcpy_64.o
  CC      arch/x86/lib/memmove_64.o
  AS      arch/x86/lib/memset_64.o
  AS      arch/x86/lib/putuser.o
  AS      arch/x86/lib/rwlock_64.o
  AS      arch/x86/lib/thunk_64.o
  CC      arch/x86/lib/usercopy_64.o
  AR      arch/x86/lib/lib.a
  LD      vmlinux.o
  MODPOST vmlinux.o
  GEN     .version
  CHK     include/linux/compile.h
dnsdomainname: Unknown host
  UPD     include/linux/compile.h
  CC      init/version.o
  LD      init/built-in.o
  LD      vmlinux
mm/built-in.o: In function `test_clear_page_writeback':
(.text+0x7561): undefined reference to `____ilog2_NaN'
make: *** [vmlinux] Error 1