_PTE_EMPTY        227 arch/sh/include/asm/pgtable_64.h #define pte_clear(mm,addr,xp)	(set_pte_at(mm, addr, xp, __pte(_PTE_EMPTY)))
_PTE_EMPTY        228 arch/sh/include/asm/pgtable_64.h #define pte_none(x)	(pte_val(x) == _PTE_EMPTY)