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

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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 <[email protected]>
Signed-off-by: Christoph Lameter <[email protected]>
Acked-by: Andy Whitcroft <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2007-10-16 01:26:10 -07:00 • committed by Linus Torvalds
commit 48f13bf3e7
2 changed files with 10 additions and 10 deletions
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10
mm/internal.h
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@ -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