From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga17.intel.com ([192.55.52.151]:31780 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726350AbgD3QE0 (ORCPT ); Thu, 30 Apr 2020 12:04:26 -0400 Subject: Re: [PATCH v2 2/3] mm/memory_hotplug: Introduce MHP_NO_FIRMWARE_MEMMAP References: <20200430102908.10107-1-david@redhat.com> <20200430102908.10107-3-david@redhat.com> <87pnbp2dcz.fsf@x220.int.ebiederm.org> <1b49c3be-6e2f-57cb-96f7-f66a8f8a9380@redhat.com> From: Dave Hansen Message-ID: Date: Thu, 30 Apr 2020 09:04:23 -0700 MIME-Version: 1.0 In-Reply-To: <1b49c3be-6e2f-57cb-96f7-f66a8f8a9380@redhat.com> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-s390-owner@vger.kernel.org List-ID: To: David Hildenbrand , "Eric W. Biederman" Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, virtio-dev@lists.oasis-open.org, virtualization@lists.linux-foundation.org, linuxppc-dev@lists.ozlabs.org, linux-acpi@vger.kernel.org, linux-nvdimm@lists.01.org, linux-hyperv@vger.kernel.org, linux-s390@vger.kernel.org, xen-devel@lists.xenproject.org, Michal Hocko , Andrew Morton , "Michael S . Tsirkin" , Michal Hocko , Pankaj Gupta , Wei Yang , Baoquan He On 4/30/20 8:52 AM, David Hildenbrand wrote: >> Justifying behavior by documentation that does not consider memory >> hotplug is bad thinking. > Are you maybe confusing this patch series with the arm64 approach? This > is not about ordinary hotplugged DIMMs. > > I'd love to get Dan's, Dave's and Michal's opinion. The impact on kexec from the DAX "kmem" driver's use of hotplug was inadvertent and unfortunate. The problem statement and solution seem pretty sane to me.