linux/mm/khugepaged.c

1515 	pmd_t *pmd, pgt_pmd;
1613 	 * ptl before pgt_pmd is removed, so uffd private needs pml taken now.
1618 	start_pte = pte_offset_map_rw_nolock(mm, pmd, haddr, &pgt_pmd, &ptl);
1626 	if (unlikely(!pmd_same(pgt_pmd, pmdp_get_lockless(pmd))))
1682 			if (unlikely(!pmd_same(pgt_pmd, pmdp_get_lockless(pmd)))) {
1688 	pgt_pmd = pmdp_collapse_flush(vma, haddr, pmd);
1697 	page_table_check_pte_clear_range(mm, haddr, pgt_pmd);
1698 	pte_free_defer(mm, pmd_pgtable(pgt_pmd));
1734 		pmd_t *pmd, pgt_pmd;
1801 			pgt_pmd = pmdp_collapse_flush(vma, addr, pmd);
1815 			page_table_check_pte_clear_range(mm, addr, pgt_pmd);
1816 			pte_free_defer(mm, pmd_pgtable(pgt_pmd));