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-rw-r--r--mm/internal.h13
1 files changed, 12 insertions, 1 deletions
diff --git a/mm/internal.h b/mm/internal.h
index 7bb33977981..d20e3cc4aef 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -13,8 +13,19 @@
#include <linux/mm.h>
-static inline void set_page_refs(struct page *page, int order)
+static inline void set_page_count(struct page *page, int v)
{
+ atomic_set(&page->_count, v);
+}
+
+/*
+ * Turn a non-refcounted page (->_count == 0) into refcounted with
+ * a count of one.
+ */
+static inline void set_page_refcounted(struct page *page)
+{
+ BUG_ON(PageCompound(page) && page_private(page) != (unsigned long)page);
+ BUG_ON(atomic_read(&page->_count));
set_page_count(page, 1);
}