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