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_PASS autolearn=ham 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 5BA05ECDE32 for ; Wed, 17 Oct 2018 09:45:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1B6CA2151D for ; Wed, 17 Oct 2018 09:45:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1B6CA2151D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726974AbeJQRks (ORCPT ); Wed, 17 Oct 2018 13:40:48 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33244 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726691AbeJQRkr (ORCPT ); Wed, 17 Oct 2018 13:40:47 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D6FC03AA14; Wed, 17 Oct 2018 09:45:54 +0000 (UTC) Received: from [10.36.116.250] (ovpn-116-250.ams2.redhat.com [10.36.116.250]) by smtp.corp.redhat.com (Postfix) with ESMTP id BA7E35F7C9; Wed, 17 Oct 2018 09:45:51 +0000 (UTC) Subject: Re: [PATCH 2/5] mm/memory_hotplug: Create add/del_device_memory functions To: Oscar Salvador Cc: akpm@linux-foundation.org, mhocko@suse.com, dan.j.williams@intel.com, yasu.isimatu@gmail.com, rppt@linux.vnet.ibm.com, malat@debian.org, linux-kernel@vger.kernel.org, pavel.tatashin@microsoft.com, jglisse@redhat.com, Jonathan.Cameron@huawei.com, rafael@kernel.org, dave.jiang@intel.com, linux-mm@kvack.org, alexander.h.duyck@linux.intel.com, Oscar Salvador References: <20181015153034.32203-1-osalvador@techadventures.net> <20181015153034.32203-3-osalvador@techadventures.net> <20181017093331.GA25724@techadventures.net> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0 MIME-Version: 1.0 In-Reply-To: <20181017093331.GA25724@techadventures.net> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Wed, 17 Oct 2018 09:45:55 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 17/10/2018 11:33, Oscar Salvador wrote: >>> /* >>> * For device private memory we call add_pages() as we only need to >>> * allocate and initialize struct page for the device memory. More- >>> @@ -1096,20 +1100,17 @@ static int hmm_devmem_pages_create(struct hmm_devmem *devmem) >>> * want the linear mapping and thus use arch_add_memory(). >>> */ >> >> Some parts of this comment should be moved into add_device_memory now. >> (e.g. we call add_pages() ...) > > I agree. > >>> +#ifdef CONFIG_ZONE_DEVICE >>> +int del_device_memory(int nid, unsigned long start, unsigned long size, >>> + struct vmem_altmap *altmap, bool mapping) >>> +{ >>> + int ret; >> >> nit: personally I prefer short parameters last in the list. > > I do not have a strong opinion here. > If people think that long parameters should be placed at the end because > it improves readability, I am ok with moving them there. > >> Can you document for both functions that they should be called with the >> memory hotplug lock in write? > > Sure, I will do that in the next version, once I get some more feedback. > >> Apart from that looks good to me. > > Thanks for reviewing it David ;-)! > May I assume your Reviewed-by here (if the above comments are addressed)? Here you go ;) Reviewed-by: David Hildenbrand I'm planning to look into the other patches as well, but I'll be busy with traveling and KVM forum the next 1.5 weeks. Cheers! -- Thanks, David / dhildenb