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>

1 files changed, 0 insertions, 10 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a8a53f879dfe..71ced519c31c 100644
--- 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);