X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mm%2Finternal.h;h=953f941ea8676a6f1768257428e8f917e75d7a2c;hb=6af2acb6619688046039234f716fd003e6ed2b3f;hp=7bb3397798188af758947b19f0dc6dd945bf30d2;hpb=84097518d1ecd2330f9488e4c2d09953a3340e74;p=linux-2.6

diff --git a/mm/internal.h b/mm/internal.h
index 7bb3397798..953f941ea8 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)
+{
+	VM_BUG_ON(PageCompound(page) && PageTail(page));
+	VM_BUG_ON(atomic_read(&page->_count));
 	set_page_count(page, 1);
 }
 
@@ -26,4 +37,14 @@ static inline void __put_page(struct page *page)
 extern void fastcall __init __free_pages_bootmem(struct page *page,
 						unsigned int order);
 
+/*
+ * function for dealing with page's order in buddy system.
+ * zone->lock is already acquired when we use these.
+ * So, we don't need atomic page->flags operations here.
+ */
+static inline unsigned long page_order(struct page *page)
+{
+	VM_BUG_ON(!PageBuddy(page));
+	return page_private(page);
+}
 #endif