BOOT_USER_PGD_PTRS  156 include/asm-frv/pgtable.h #define BOOT_KERNEL_PGD_PTRS	(PTRS_PER_PGD - BOOT_USER_PGD_PTRS)
BOOT_USER_PGD_PTRS   75 include/asm-mn10300/pgtable.h #define BOOT_KERNEL_PGD_PTRS	(1024 - BOOT_USER_PGD_PTRS)