X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mm%2Finternal.h;h=953f941ea8676a6f1768257428e8f917e75d7a2c;hb=cf03613e9662c28372b8c83538fb402df37c53f5;hp=e3042db2a2d651c61d2d4d0e3cae2e3fdd8ca9ed;hpb=0f8053a509ceba4a077a50ea7b77039b5559b428;p=linux-2.6

diff --git a/mm/internal.h b/mm/internal.h
index e3042db2a2..953f941ea8 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -13,21 +13,20 @@
 
 #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)
 {
-#ifdef CONFIG_MMU
-	set_page_count(page, 1);
-#else
-	int i;
+	atomic_set(&page->_count, v);
+}
 
-	/*
-	 * We need to reference all the pages for this order, otherwise if
-	 * anyone accesses one of the pages with (get/put) it will be freed.
-	 * - eg: access_process_vm()
-	 */
-	for (i = 0; i < (1 << order); i++)
-		set_page_count(page + i, 1);
-#endif /* CONFIG_MMU */
+/*
+ * 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);
 }
 
 static inline void __put_page(struct page *page)
@@ -38,4 +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