diff options
| author | Mel Gorman | 2007-10-16 01:26:10 -0700 |
|---|---|---|
| committer | Linus Torvalds | 2007-10-16 09:43:01 -0700 |
| commit | 48f13bf3e742fca8aab87f6c39451d03bf5952d4 (patch) | |
| tree | 668160019ab157500a90655cf44f798ed3c77893 | |
| parent | ea3061d227816d00717446ac12b853d7ae04b4fe (diff) | |
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>
| -rw-r--r-- | mm/internal.h | 10 | ||||
| -rw-r--r-- | mm/page_alloc.c | 10 |
2 files changed, 10 insertions, 10 deletions
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 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); |