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-rw-r--r--include/linux/mm.h21
-rw-r--r--mm/mmzone.c20
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