linux-kernel - [patch] set_page_refcounted VM_BUG

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Message-Id: <200712141136.10481.qiyong@fc-cn.com>
Date:	Fri, 14 Dec 2007 11:36:10 +0800
From:	Qi Yong <qiyong@...cn.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [patch] set_page_refcounted VM_BUG_ON fix

Hello,

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@...cn.com>
---
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
diff --git a/mm/internal.h b/mm/internal.h
index 953f941..79797db 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -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);
 }

-- 
Qi Yong
--
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