From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 38CF8C31E45 for ; Thu, 13 Jun 2019 16:45:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 162A620673 for ; Thu, 13 Jun 2019 16:45:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392641AbfFMQpB (ORCPT ); Thu, 13 Jun 2019 12:45:01 -0400 Received: from mx1.redhat.com ([209.132.183.28]:44756 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730403AbfFMGOO (ORCPT ); Thu, 13 Jun 2019 02:14:14 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 8EB6D223898; Thu, 13 Jun 2019 06:14:12 +0000 (UTC) Received: from [10.36.116.187] (ovpn-116-187.ams2.redhat.com [10.36.116.187]) by smtp.corp.redhat.com (Postfix) with ESMTP id A443C27CC3; Thu, 13 Jun 2019 06:14:09 +0000 (UTC) Subject: Re: [PATCH V5 - Rebased] mm/hotplug: Reorder memblock_[free|remove]() calls in try_remove_memory() To: Andrew Morton Cc: Anshuman Khandual , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, will.deacon@arm.com, ard.biesheuvel@arm.com, osalvador@suse.de, mhocko@suse.com, mark.rutland@arm.com References: <36e0126f-e2d1-239c-71f3-91125a49e019@redhat.com> <1560252373-3230-1-git-send-email-anshuman.khandual@arm.com> <20190611151908.cdd6b73fd17fda09b1b3b65b@linux-foundation.org> <5b4f1f19-2f8d-9b8f-4240-7b728952b6fe@arm.com> <67f5c5ad-d753-77d8-8746-96cf4746b3e0@redhat.com> <20190612185450.73841b9f5af3a4189de6f910@linux-foundation.org> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190612185450.73841b9f5af3a4189de6f910@linux-foundation.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Thu, 13 Jun 2019 06:14:13 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 13.06.19 03:54, Andrew Morton wrote: > On Wed, 12 Jun 2019 08:53:33 +0200 David Hildenbrand wrote: > >>>>> ... >>>>> >>>>> >>>>> - Rebased on linux-next (next-20190611) >>>> >>>> Yet the patch you've prepared is designed for 5.3. Was that >>>> deliberate, or should we be targeting earlier kernels? >>> >>> It was deliberate for 5.3 as a preparation for upcoming reworked arm64 hot-remove. >>> >> >> We should probably add to the patch description something like "This is >> a preparation for arm64 memory hotremove. The described issue is not >> relevant on other architectures." > > Please. And is there any reason to merge it separately? Can it be > [patch 1/3] in the "arm64/mm: Enable memory hot remove" series? > Nothing that the patch can be considered a cleanup: " mm/hotplug: Reorder memblock_[free|remove]() calls in try_remove_memory() In add_memory_resource() we have: memblock_add_node(start, size, nid) ... arch_add_memory(nid, start, size, &restrictions); ... create_memory_block_devices(start, size); While in try_remove_memory() we have: memblock_free(start, size); memblock_remove(start, size); ... remove_memory_block_devices(start, size); arch_remove_memory(nid, start, size, NULL); Let's restore the correct order by removing the memblock after arch_remove_memory(). " I think with such a description, we can include it now. Andrew? -- Thanks, David / dhildenb