PTRS_PER_PGD      661 arch/x86/include/asm/pgtable.h #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
PTRS_PER_PGD      676 arch/x86/include/asm/pgtable.h #define KERNEL_PGD_PTRS		(PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)