2 files changed, 24 insertions, 17 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 437da0ce78c7..8a5bbe3b9e56 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -677,25 +677,14 @@ static inline int page_last_nid(struct page *page)
         return (page->flags >> LAST_NID_PGSHIFT) & LAST_NID_MASK;
 }
 
-static inline int page_xchg_last_nid(struct page *page, int nid)
-{
-        unsigned long old_flags, flags;
-        int last_nid;
-
-        do {
-                old_flags = flags = page->flags;
-                last_nid = page_last_nid(page);
-
-                flags &= ~(LAST_NID_MASK << LAST_NID_PGSHIFT);
-                flags |= (nid & LAST_NID_MASK) << LAST_NID_PGSHIFT;
-        } while (unlikely(cmpxchg(&page->flags, old_flags, flags) != old_flags));
-
-        return last_nid;
-}
+extern int page_xchg_last_nid(struct page *page, int nid);
 
 static inline void reset_page_last_nid(struct page *page)
 {
-        page_xchg_last_nid(page, (1 << LAST_NID_SHIFT) - 1);
+        int nid = (1 << LAST_NID_SHIFT) - 1;
+
+        page->flags &= ~(LAST_NID_MASK << LAST_NID_PGSHIFT);
+        page->flags |= (nid & LAST_NID_MASK) << LAST_NID_PGSHIFT;
 }
 #endif /* LAST_NID_NOT_IN_PAGE_FLAGS */
 #else
diff --git a/mm/mmzone.c b/mm/mmzone.c
index 4596d81b89b1..bce796e8487f 100644
--- a/mm/mmzone.c
+++ b/mm/mmzone.c
@@ -1,7 +1,7 @@
 /*
  * linux/mm/mmzone.c
  *
- * management codes for pgdats and zones.
+ * management codes for pgdats, zones and page flags
  */
 
 
@@ -96,3 +96,21 @@ void lruvec_init(struct lruvec *lruvec)
         for_each_lru(lru)
                 INIT_LIST_HEAD(&lruvec->lists[lru]);
 }
+
+#if defined(CONFIG_NUMA_BALANCING) && !defined(LAST_NID_NOT_IN_PAGE_FLAGS)
+int page_xchg_last_nid(struct page *page, int nid)
+{
+        unsigned long old_flags, flags;
+        int last_nid;
+
+        do {
+                old_flags = flags = page->flags;
+                last_nid = page_last_nid(page);
+
+                flags &= ~(LAST_NID_MASK << LAST_NID_PGSHIFT);
+                flags |= (nid & LAST_NID_MASK) << LAST_NID_PGSHIFT;
+        } while (unlikely(cmpxchg(&page->flags, old_flags, flags) != old_flags));
+
+        return last_nid;
+}
+#endif