diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 336ee92..73c25912 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -295,7 +295,8 @@
 }
 #endif
 
-static void bad_page(struct page *page, char *reason, unsigned long bad_flags)
+static void bad_page(struct page *page, const char *reason,
+		unsigned long bad_flags)
 {
 	static unsigned long resume;
 	static unsigned long nr_shown;
@@ -623,7 +624,7 @@
 
 static inline int free_pages_check(struct page *page)
 {
-	char *bad_reason = NULL;
+	const char *bad_reason = NULL;
 	unsigned long bad_flags = 0;
 
 	if (unlikely(page_mapcount(page)))
@@ -859,7 +860,7 @@
  */
 static inline int check_new_page(struct page *page)
 {
-	char *bad_reason = NULL;
+	const char *bad_reason = NULL;
 	unsigned long bad_flags = 0;
 
 	if (unlikely(page_mapcount(page)))
@@ -6545,7 +6546,8 @@
 	printk(")\n");
 }
 
-void dump_page_badflags(struct page *page, char *reason, unsigned long badflags)
+void dump_page_badflags(struct page *page, const char *reason,
+		unsigned long badflags)
 {
 	printk(KERN_ALERT
 	       "page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
@@ -6561,7 +6563,7 @@
 	mem_cgroup_print_bad_page(page);
 }
 
-void dump_page(struct page *page, char *reason)
+void dump_page(struct page *page, const char *reason)
 {
 	dump_page_badflags(page, reason, 0);
 }