Add buffer head related helper functions

[linux-2.6-omap-h63xx.git] / mm / internal.h

diff --git a/mm/internal.h b/mm/internal.h
index a3110c02aea7d4b6f8edbd06e5a06477d3c2fc8b..953f941ea8676a6f1768257428e8f917e75d7a2c 100644 (file)
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -37,4 +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