diff options
Diffstat (limited to 'sys/powerpc/aim/mmu_oea64.c')
| -rw-r--r-- | sys/powerpc/aim/mmu_oea64.c | 40 |
1 files changed, 34 insertions, 6 deletions
diff --git a/sys/powerpc/aim/mmu_oea64.c b/sys/powerpc/aim/mmu_oea64.c index 8b6453a..140e949 100644 --- a/sys/powerpc/aim/mmu_oea64.c +++ b/sys/powerpc/aim/mmu_oea64.c @@ -1485,29 +1485,57 @@ moea64_is_referenced(mmu_t mmu, vm_page_t m) boolean_t moea64_is_modified(mmu_t mmu, vm_page_t m) { + boolean_t rv; - if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0) - return (FALSE); + KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0, + ("moea64_is_modified: page %p is not managed", m)); - return (moea64_query_bit(m, LPTE_CHG)); + /* + * If the page is not VPO_BUSY, then PG_WRITEABLE cannot be + * concurrently set while the object is locked. Thus, if PG_WRITEABLE + * is clear, no PTEs can have LPTE_CHG set. + */ + VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED); + if ((m->oflags & VPO_BUSY) == 0 && + (m->flags & PG_WRITEABLE) == 0) + return (FALSE); + vm_page_lock_queues(); + rv = moea64_query_bit(m, LPTE_CHG); + vm_page_unlock_queues(); + return (rv); } void moea64_clear_reference(mmu_t mmu, vm_page_t m) { - if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0) - return; + KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0, + ("moea64_clear_reference: page %p is not managed", m)); + vm_page_lock_queues(); moea64_clear_bit(m, LPTE_REF, NULL); + vm_page_unlock_queues(); } void moea64_clear_modify(mmu_t mmu, vm_page_t m) { - if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0) + KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0, + ("moea64_clear_modify: page %p is not managed", m)); + VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED); + KASSERT((m->oflags & VPO_BUSY) == 0, + ("moea64_clear_modify: page %p is busy", m)); + + /* + * If the page is not PG_WRITEABLE, then no PTEs can have LPTE_CHG + * set. If the object containing the page is locked and the page is + * not VPO_BUSY, then PG_WRITEABLE cannot be concurrently set. + */ + if ((m->flags & PG_WRITEABLE) == 0) return; + vm_page_lock_queues(); moea64_clear_bit(m, LPTE_CHG, NULL); + vm_page_unlock_queues(); } /* |
