pmap_check_attr

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#define pmap_clear_modify(pg) (pmap_check_attr((pg), PMAP_ATTR_CHG, 1))

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#define pmap_clear_reference(pg)(pmap_check_attr((pg), PMAP_ATTR_REF, 1))

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#define pmap_is_modified(pg) (pmap_check_attr((pg), PMAP_ATTR_CHG, 0))

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#define pmap_is_referenced(pg) (pmap_check_attr((pg), PMAP_ATTR_REF, 0))

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bool pmap_check_attr(struct vm_page *, u_int, int);