PTRS_PER_PMD      526 arch/x86/include/asm/pgtable.h 	return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
PTRS_PER_PMD     1548 include/linux/mm.h 	unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);