Re: [PATCH]: fix the bug of __free_pages() of mm/page_alloc.c

[zhan rongkai <zhanrk@gmail.com>]

--- linux-2.6.10.orig/mm/page_alloc.c	2004-12-25 05:33:51.000000000 +0800
+++ linux-2.6.10/mm/page_alloc.c	2005-01-21 11:43:44.000000000 +0800
@@ -788,7 +788,22 @@
 
 fastcall void __free_pages(struct page *page, unsigned int order)
 {
-	if (!PageReserved(page) && put_page_testzero(page)) {
+	if (!PageReserved(page)) {
+#ifdef CONFIG_MMU
+		if (!put_page_testzero(page))
+			return;
+#else
+		int i, result = 1;
+
+		/*
+		 * We need to de-reference all the pages for this order -- see
set_page_refs()
+		 */
+		 for (i = 0; i < (1 << order); i++)
+			 result &= put_page_testzero(page+i);
+		 if (!result)
+			 BUG();
+#endif /* CONFIG_MMU */
+
 		if (order == 0)
 			free_hot_page(page);
 		else


-- 
Rongkai Zhan