From mboxrd@z Thu Jan 1 00:00:00 1970 From: Akinobu Mita Subject: [PATCH 2/2 -mmotm] debug-pagealloc: cannot depend on hibernation Date: Tue, 10 Mar 2009 23:38:57 +0900 Message-ID: <20090310143857.GB3151@localhost.localdomain> References: <20090310143701.GA3151@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-2022-jp Return-path: Received: from rv-out-0506.google.com ([209.85.198.227]:5169 "EHLO rv-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754619AbZCJOjR (ORCPT ); Tue, 10 Mar 2009 10:39:17 -0400 Content-Disposition: inline In-Reply-To: <20090310143701.GA3151@localhost.localdomain> Sender: linux-arch-owner@vger.kernel.org List-ID: To: linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org, akpm@linux-foundation.org The generic debug-pagealloc generates wrong messages for the page corruption after hibernation. Because the free pages are not saved to the suspend image. Signed-off-by: Akinobu Mita Cc: --- mm/Kconfig.debug | 5 +++++ 1 file changed, 5 insertions(+) Index: 2.6-mmotm/mm/Kconfig.debug =================================================================== --- 2.6-mmotm.orig/mm/Kconfig.debug +++ 2.6-mmotm/mm/Kconfig.debug @@ -4,9 +4,14 @@ config WANT_PAGE_DEBUG_FLAGS config PAGE_POISONING bool "Debug page memory allocations" depends on DEBUG_KERNEL && !ARCH_SUPPORTS_DEBUG_PAGEALLOC + depends on !HIBERNATION select DEBUG_PAGEALLOC select WANT_PAGE_DEBUG_FLAGS help Fill the pages with poison patterns after free_pages() and verify the patterns before alloc_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions. + + This option cannot enalbe with hibernation. Otherwise, it will get + wrong messages for memory corruption because the free pages are not + saved to the suspend image.