Breakout page_order() to internal.h to avoid special knowledge of the buddy allocator

The statistics patch later needs to know what order a free page is on the free
lists.  Rather than having special knowledge of page_private() when
PageBuddy() is set, this patch places out page_order() in internal.h and adds
a VM_BUG_ON to catch using it on non-PageBuddy pages.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Acked-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a8a53f879dfe5501fc9ecc880344c524d910985b..71ced519c31cd78eef572d7fd308f82cf6b22d76 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -313,16 +313,6 @@ static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags)
                clear_highpage(page + i);
 }
 
-/*
- * 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)
-{
-       return page_private(page);
-}
-
 static inline void set_page_order(struct page *page, int order)
 {
        set_page_private(page, order);