From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51]) by kanga.kvack.org (Postfix) with ESMTP id A3AD28D0040 for ; Wed, 23 Mar 2011 19:16:26 -0400 (EDT) Date: Wed, 23 Mar 2011 15:58:53 -0700 From: Greg KH Subject: Re: [stable] [PATCH] mm: PageBuddy and mapcount underflows robustness Message-ID: <20110323225853.GH27334@kroah.com> References: <20110314155232.GB10696@random.random> <20110314165922.GE10696@random.random> <20110317231635.GC10696@random.random> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Hugh Dickins Cc: Andrea Arcangeli , linux-kernel@vger.kernel.org, linux-mm@kvack.org, David Rientjes , Andrew Morton , Linus Torvalds , stable@kernel.org On Fri, Mar 18, 2011 at 02:34:03PM -0700, Hugh Dickins wrote: > On Fri, 18 Mar 2011, Andrea Arcangeli wrote: > > On Mon, Mar 14, 2011 at 10:30:11AM -0700, Linus Torvalds wrote: > > Subject: mm: PageBuddy and mapcount robustness > > > > From: Andrea Arcangeli > > > > Change the _mapcount value indicating PageBuddy from -2 to -128 for > > more robusteness against page_mapcount() undeflows. > > > > Use reset_page_mapcount instead of __ClearPageBuddy in bad_page to > > ignore the previous retval of PageBuddy(). > > > > Signed-off-by: Andrea Arcangeli > > Reported-by: Hugh Dickins > > Yes, this version satisfies my objections too. > I'd say Acked-by but I see that it's already in, great. > > I've Cc'ed stable@kernel.org: please can we have this in 2.6.38.1, > since 2.6.38 regressed the recovery from bad page states, > inadvertently changing them to a fatal error when CONFIG_DEBUG_VM. Now queued up for 2.6.38.2, thanks. greg k-h -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org