PTRS_PER_PGD_SHIFT 129 arch/ia64/include/asm/pgtable.h #define PTRS_PER_PGD (1UL << PTRS_PER_PGD_SHIFT) PTRS_PER_PGD_SHIFT 243 arch/ia64/include/asm/pgtable.h #define RGN_MAP_SHIFT (PGDIR_SHIFT + PTRS_PER_PGD_SHIFT - 3)