static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct mm_walk *walk) { struct clear_refs_private *cp = walk->private; struct vm_area_struct *vma = walk->vma; pte_t *pte, ptent; spinlock_t *ptl; struct page *page; if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) { if (cp->type == CLEAR_REFS_SOFT_DIRTY) { clear_soft_dirty_pmd(vma, addr, pmd); goto out; } page = pmd_page(*pmd); /* Clear accessed and referenced bits. */ pmdp_test_and_clear_young(vma, addr, pmd); ClearPageReferenced(page); out: spin_unlock(ptl); return 0; } if (pmd_trans_unstable(pmd)) return 0; pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); for (; addr != end; pte++, addr += PAGE_SIZE) { ptent = *pte; if (cp->type == CLEAR_REFS_SOFT_DIRTY) { clear_soft_dirty(vma, addr, pte); continue; } if (!pte_present(ptent)) continue; page = vm_normal_page(vma, addr, ptent); if (!page) continue; /* Clear accessed and referenced bits. */ ptep_test_and_clear_young(vma, addr, pte); ClearPageReferenced(page); } pte_unmap_unlock(pte - 1, ptl); cond_resched(); return 0; }
int pmdp_clear_flush_young(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) { int young; #ifndef CONFIG_TRANSPARENT_HUGEPAGE BUG(); #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ VM_BUG_ON(address & ~HPAGE_PMD_MASK); young = pmdp_test_and_clear_young(vma, address, pmdp); if (young) flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); return young; }