set_page_refcounted() VM_BUG_ON fix
authorQi Yong <qiyong@fc-cn.com>
Tue, 5 Feb 2008 06:29:27 +0000 (22:29 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Tue, 5 Feb 2008 17:44:19 +0000 (09:44 -0800)
The current PageTail semantic is that a PageTail page is first a
PageCompound page.  So remove the redundant PageCompound test in
set_page_refcounted().

Signed-off-by: Qi Yong <qiyong@fc-cn.com>
Cc: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/internal.h

index 1e34d2462a48e7ecce22ccd279b4a1f5f9b1656b..5a9a6200e034fb43aad09efe34ac1b2e49825509 100644 (file)
@@ -24,7 +24,7 @@ static inline void set_page_count(struct page *page, int v)
  */
 static inline void set_page_refcounted(struct page *page)
 {
-       VM_BUG_ON(PageCompound(page) && PageTail(page));
+       VM_BUG_ON(PageTail(page));
        VM_BUG_ON(atomic_read(&page->_count));
        set_page_count(page, 1);
 }