_RPAGE_RSV1        40 arch/powerpc/include/asm/book3s/64/hash-4k.h #define H_PAGE_BUSY	_RPAGE_RSV1     /* software: PTE & hash are busy */
_RPAGE_RSV1        39 arch/powerpc/include/asm/book3s/64/hash-64k.h #define H_PTE_PKEY_BIT0	_RPAGE_RSV1