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-rw-r--r--mm/hugetlb.c4
-rw-r--r--mm/page_alloc.c15
-rw-r--r--mm/swap.c2
3 files changed, 9 insertions, 12 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 67f29516662..508707704d2 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -85,7 +85,7 @@ void free_huge_page(struct page *page)
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 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, unsigned long addr)
}
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 dde04ff4be3..eec89ab39bb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -169,20 +169,17 @@ static void bad_page(struct page *page)
* 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 @@ static void destroy_compound_page(struct page *page, unsigned long order)
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 76247424dea..cce3dda59c5 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -40,7 +40,7 @@ static void put_compound_page(struct page *page)
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);
}
}