Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756088AbeAHJKn (ORCPT + 1 other); Mon, 8 Jan 2018 04:10:43 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:42472 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755118AbeAHJKl (ORCPT ); Mon, 8 Jan 2018 04:10:41 -0500 Date: Mon, 8 Jan 2018 10:10:44 +0100 From: Greg Kroah-Hartman To: Michal Hocko Cc: Mike Galbraith , linux-kernel@vger.kernel.org, stable@vger.kernel.org, "Kirill A. Shutemov" , Andrew Morton , Andy Lutomirski , Borislav Petkov , Cyrill Gorcunov , Linus Torvalds , Peter Zijlstra , Thomas Gleixner , linux-mm@kvack.org, Ingo Molnar Subject: Re: [PATCH 4.14 023/159] mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y Message-ID: <20180108091044.GA16816@kroah.com> References: <20171222084623.668990192@linuxfoundation.org> <20171222084625.007160464@linuxfoundation.org> <1515302062.6507.18.camel@gmx.de> <20180107091115.GB29329@kroah.com> <20180107101847.GC24862@dhcp22.suse.cz> <1515329042.13953.14.camel@gmx.de> <20180107132309.GD24862@dhcp22.suse.cz> <20180108075308.GC24062@kroah.com> <20180108084723.GC5717@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20180108084723.GC5717@dhcp22.suse.cz> User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: On Mon, Jan 08, 2018 at 09:47:23AM +0100, Michal Hocko wrote: > On Mon 08-01-18 08:53:08, Greg KH wrote: > > On Sun, Jan 07, 2018 at 02:23:09PM +0100, Michal Hocko wrote: > > > On Sun 07-01-18 13:44:02, Mike Galbraith wrote: > > > > On Sun, 2018-01-07 at 11:18 +0100, Michal Hocko wrote: > > > > > On Sun 07-01-18 10:11:15, Greg KH wrote: > > > > > > On Sun, Jan 07, 2018 at 06:14:22AM +0100, Mike Galbraith wrote: > > > > > > > On Fri, 2017-12-22 at 09:45 +0100, Greg Kroah-Hartman wrote: > > > > > > > > 4.14-stable review patch. If anyone has any objections, please let me know. > > > > > > > > > > > > > > FYI, this broke kdump, or rather the makedumpfile part thereof. > > > > > > > ?Forward looking wreckage is par for the kdump course, but... > > > > > > > > > > > > Is it also broken in Linus's tree with this patch? Or is there an > > > > > > add-on patch that I should apply to 4.14 to resolve this issue there? > > > > > > > > > > This one http://lkml.kernel.org/r/1513932498-20350-1-git-send-email-bhe@redhat.com > > > > > I guess. > > > > > > > > That won't unbreak kdump, else master wouldn't be broken. ?I don't care > > > > deeply, or know if anyone else does, I'm just reporting it because I > > > > met it and chased it down. > > > > > > OK, I didn't notice that d8cfbbfa0f7 ("mm/sparse.c: wrong allocation > > > for mem_section") made it in after rc6. I am still wondering why > > > 83e3c48729 ("mm/sparsemem: Allocate mem_section at runtime for > > > CONFIG_SPARSEMEM_EXTREME=y") made it into the stable tree in the first > > > place. > > > > It was part of the prep for the KTPI code from what I can tell. > > I do not see a direct relation, to be honest. It is more related to > 5-level page tables but I might be missing some subtle relation. > > > If you > > think it should be reverted, just let me know and I'll be glad to do so. > > This seems to be affecting Linus tree as well so it needs to get > resolved. I would suggest reverting in stable for the mean time. > If you really need it in the stable tree then you can pull it back later > with all the follow up fixes. Ok, I've now reverted it, thanks. greg k-h