From:	 Andrew Morton <akpm@zip.com.au>
To:	 lkml <linux-kernel@vger.kernel.org>
Subject: aa-160-lru_release_check
Date:	 Tue, 19 Mar 2002 20:01:20 -0800



Hugh's much-discussed check for releasing pages which are still on the LRU.


=====================================

--- 2.4.19-pre3/mm/page_alloc.c~aa-160-lru_release_check	Tue Mar 19 19:49:02 2002
+++ 2.4.19-pre3-akpm/mm/page_alloc.c	Tue Mar 19 19:49:02 2002
@@ -102,8 +102,11 @@ static void __free_pages_ok (struct page
 	/* Yes, think what happens when other parts of the kernel take 
 	 * a reference to a page in order to pin it for io. -ben
 	 */
-	if (PageLRU(page))
+	if (PageLRU(page)) {
+		if (unlikely(in_interrupt()))
+			BUG();
 		lru_cache_del(page);
+	}
 
 	if (page->buffers)
 		BUG();

-
-
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