PTRS_PER_PUD       35 arch/x86/include/asm/pgtable_64_types.h #define PTRS_PER_PUD	512
PTRS_PER_PUD        9 include/asm-generic/4level-fixup.h #define PTRS_PER_PUD			1
PTRS_PER_PUD       16 include/asm-generic/pgtable-nopud.h #define PTRS_PER_PUD	1