From 48f13bf3e742fca8aab87f6c39451d03bf5952d4 Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Tue, 16 Oct 2007 01:26:10 -0700 Subject: 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 Signed-off-by: Christoph Lameter Acked-by: Andy Whitcroft Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/internal.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'mm/internal.h') diff --git a/mm/internal.h b/mm/internal.h index a3110c02aea7..953f941ea867 100644 --- 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 -- cgit v1.2.3-58-ga151