PTE_FILE_BITS2     77 arch/x86/include/asm/pgtable-2level.h #define PTE_FILE_MASK2		((1U << PTE_FILE_BITS2) - 1)
PTE_FILE_BITS2     80 arch/x86/include/asm/pgtable-2level.h #define PTE_FILE_LSHIFT3	(PTE_FILE_BITS1 + PTE_FILE_BITS2)