_PMD_EMPTY         64 arch/sh/include/asm/pgtable_64.h #define pmd_clear(pmd_entry_p)	(set_pmd((pmd_entry_p), __pmd(_PMD_EMPTY)))
_PMD_EMPTY         65 arch/sh/include/asm/pgtable_64.h #define pmd_none(pmd_entry)	(pmd_val((pmd_entry)) == _PMD_EMPTY)