4.4.y build failure

[Dan Rue <dan.rue@xxxxxxxxxx>]

I'm seeing the following i386 build failure with defconfig on 4.4-rc branch:

$ make ARCH=i386
  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/x86/kernel/machine_kexec_32.o
arch/x86/kernel/machine_kexec_32.c: In function ‘machine_kexec_free_page_tables’:
arch/x86/kernel/machine_kexec_32.c:73:45: error: ‘PGD_ALLOCATION_ORDER’ undeclared (first use in this function); did you mean ‘PAGE_ALLOC_COSTLY_ORDER’?
  free_pages((unsigned long)image->arch.pgd, PGD_ALLOCATION_ORDER);
                                             ^~~~~~~~~~~~~~~~~~~~
                                             PAGE_ALLOC_COSTLY_ORDER
arch/x86/kernel/machine_kexec_32.c:73:45: note: each undeclared identifier is reported only once for each function it appears in
arch/x86/kernel/machine_kexec_32.c: In function ‘machine_kexec_alloc_page_tables’:
arch/x86/kernel/machine_kexec_32.c:90:11: error: ‘PGD_ALLOCATION_ORDER’ undeclared (first use in this function); did you mean ‘PAGE_ALLOC_COSTLY_ORDER’?
           PGD_ALLOCATION_ORDER);
           ^~~~~~~~~~~~~~~~~~~~
           PAGE_ALLOC_COSTLY_ORDER
scripts/Makefile.build:269: recipe for target 'arch/x86/kernel/machine_kexec_32.o' failed
make[2]: *** [arch/x86/kernel/machine_kexec_32.o] Error 1
scripts/Makefile.build:476: recipe for target 'arch/x86/kernel' failed
make[1]: *** [arch/x86/kernel] Error 2
Makefile:980: recipe for target 'arch/x86' failed
make: *** [arch/x86] Error 2

Dan