From aec2c3ed01ed54d0cdf7f6b7c4be217c045ac5ea Mon Sep 17 00:00:00 2001
From: Christoph Lameter <clameter@sgi.com>
Date: Mon, 4 Feb 2008 22:28:35 -0800
Subject: [PATCH] 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: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
include/linux/mm.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index f28a0338574f..bcbe6979ff65 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -227,7 +227,7 @@ static inline int put_page_testzero(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);
}