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Commit aec2c3ed authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
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VM: allow get_page_unless_zero on compound pages 



Both slab defrag and the large blocksize patches need to ability to take
refcounts on compound pages.  May be useful in other places as well.

Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent bf53d6f8

include/linux/mm.h

+1 −1
Original line number Original line Diff line number Diff line
@@ -227,7 +227,7 @@ static inline int put_page_testzero(struct page *page) 
 */

 */

static inline int get_page_unless_zero(struct page *page)

static inline int get_page_unless_zero(struct page *page)

{

{

	VM_BUG_ON(PageCompound(page));

	VM_BUG_ON(PageTail(page));

	return atomic_inc_not_zero(&page->_count);

	return atomic_inc_not_zero(&page->_count);

}

}