diff --git a/mm/swapfile.c b/mm/swapfile.c
index f1f5ec7..a15def6 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1723,13 +1723,14 @@
  */
 int valid_swaphandles(swp_entry_t entry, unsigned long *offset)
 {
-	int ret = 0, i = 1 << page_cluster;
+	int our_page_cluster = page_cluster;
+	int ret = 0, i = 1 << our_page_cluster;
 	unsigned long toff;
 	struct swap_info_struct *swapdev = swp_type(entry) + swap_info;
 
-	if (!page_cluster)	/* no readahead */
+	if (!our_page_cluster)	/* no readahead */
 		return 0;
-	toff = (swp_offset(entry) >> page_cluster) << page_cluster;
+	toff = (swp_offset(entry) >> our_page_cluster) << our_page_cluster;
 	if (!toff)		/* first page is swap header */
 		toff++, i--;
 	*offset = toff;