diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 67f2951..5087077 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -85,7 +85,7 @@
 	BUG_ON(page_count(page));
 
 	INIT_LIST_HEAD(&page->lru);
-	page[1].mapping = NULL;
+	page[1].lru.next = NULL;			/* reset dtor */
 
 	spin_lock(&hugetlb_lock);
 	enqueue_huge_page(page);
@@ -105,7 +105,7 @@
 	}
 	spin_unlock(&hugetlb_lock);
 	set_page_count(page, 1);
-	page[1].mapping = (void *)free_huge_page;
+	page[1].lru.next = (void *)free_huge_page;	/* set dtor */
 	for (i = 0; i < (HPAGE_SIZE/PAGE_SIZE); ++i)
 		clear_user_highpage(&page[i], addr);
 	return page;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index dde04ff..eec89ab 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -169,20 +169,17 @@
  * All pages have PG_compound set.  All pages have their ->private pointing at
  * the head page (even the head page has this).
  *
- * The first tail page's ->mapping, if non-zero, holds the address of the
- * compound page's put_page() function.
- *
- * The order of the allocation is stored in the first tail page's ->index
- * This is only for debug at present.  This usage means that zero-order pages
- * may not be compound.
+ * The first tail page's ->lru.next holds the address of the compound page's
+ * put_page() function.  Its ->lru.prev holds the order of allocation.
+ * This usage means that zero-order pages may not be compound.
  */
 static void prep_compound_page(struct page *page, unsigned long order)
 {
 	int i;
 	int nr_pages = 1 << order;
 
-	page[1].mapping = NULL;
-	page[1].index = order;
+	page[1].lru.next = NULL;			/* set dtor */
+	page[1].lru.prev = (void *)order;
 	for (i = 0; i < nr_pages; i++) {
 		struct page *p = page + i;
 
@@ -196,7 +193,7 @@
 	int i;
 	int nr_pages = 1 << order;
 
-	if (unlikely(page[1].index != order))
+	if (unlikely((unsigned long)page[1].lru.prev != order))
 		bad_page(page);
 
 	for (i = 0; i < nr_pages; i++) {
diff --git a/mm/swap.c b/mm/swap.c
index 7624742..cce3dda 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -40,7 +40,7 @@
 	if (put_page_testzero(page)) {
 		void (*dtor)(struct page *page);
 
-		dtor = (void (*)(struct page *))page[1].mapping;
+		dtor = (void (*)(struct page *))page[1].lru.next;
 		(*dtor)(page);
 	}
 }