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=-1.0 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 94E11C04AB1 for ; Mon, 13 May 2019 07:49:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4593F206BF for ; Mon, 13 May 2019 07:49:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4593F206BF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id C3D136B0005; Mon, 13 May 2019 03:49:43 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BC6886B0006; Mon, 13 May 2019 03:49:43 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A3FD66B0007; Mon, 13 May 2019 03:49:43 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-qt1-f197.google.com (mail-qt1-f197.google.com [209.85.160.197]) by kanga.kvack.org (Postfix) with ESMTP id 817BB6B0005 for ; Mon, 13 May 2019 03:49:43 -0400 (EDT) Received: by mail-qt1-f197.google.com with SMTP id q32so13615164qtk.10 for ; Mon, 13 May 2019 00:49:43 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:subject:to:cc :references:from:openpgp:autocrypt:organization:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=xe+ARmEtb8xBh8MUVAlBnTfA466DDi1Opi/EgdkU/n0=; b=r4voSbWGYcXwB8MJ39iIEeLP5c9+AvagpkqlsYZ1Lqx9PxzqmFYW5efGw9mepBapIY evurUtGFvsfWIh0j6TgelxOVfIj2Av5kV4pjrEek7wL1KJX0pOSnKAD7aaQEKvcMwuyc HPg0ZWzS7J8mTYt6JmUs/RGVe27Yo8ssv/ikLntAx5dAL/eJJpC2iewnVw125x6YE2j6 hg8l5Cz69YS6PNNA2uezmiD5oMewzXRZn6GS8fHB0O2/NFo3XLza991tY6//XCy1zfW1 Ni+AGpGg1OniEIRHWAR2t70TO/huuw2KYZeXK8Y8TpNejbIIxvkm6CNX5zuUGG3lfaeV QiVg== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com X-Gm-Message-State: APjAAAUZWJyIv4B0+Z+1VIyTuSIqvAmJC0ixH+igJlcnhrFwrZ74Iuib bC0evzhylvNwUBrEA3u2VVYTGFz7udtacoVcS0IEYDmsQKl3dE91Hhxk15p6GzWKqfJXFFmM4Mv GtXmLPWEoL4WIqU+4EBzyqTHto7yxCO0F5aPoAb98DEgZKH1NrFML0axZ0+UdbtjaWw== X-Received: by 2002:ac8:18d4:: with SMTP id o20mr22788838qtk.185.1557733783318; Mon, 13 May 2019 00:49:43 -0700 (PDT) X-Google-Smtp-Source: APXvYqwYTMKx1JkK5WX7liYX1JajWm56bFK5hQZu4a7qTcDoJFRedTxrbVipNcIJOXj7sED5640h X-Received: by 2002:ac8:18d4:: with SMTP id o20mr22788804qtk.185.1557733782673; Mon, 13 May 2019 00:49:42 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1557733782; cv=none; d=google.com; s=arc-20160816; b=Q2CeajxARmz/lztof7voOkKvqPBnsCZC3dBKXuPxi3yr1OGVQZsh8KUltN1yOua4Wl bndT1P/FGUhcxyoZgGnnayCpvB7Wwwy/mNFf1SWZ+M+1+xt4Pynu/cQp6ye0lZHT/idF OLdUYnSB2IRm+UEUv3QumQ7JU84pXdC9s6QFz2bt/Vj1HDHxrJn48ww2AMxNWodm8EwL QmrI1V4RcgQwVoUX6enWn3D62P72ZPDIj4hUUmw6E7fs4rPc+sZNDqQLTrx/sStGwYOz PtNfNn3a6wInlN2cdFdrezR7Lo9Jk6KavTKvZKW+rToE7wObN0YnO7PoLcmfleO/bfDF lxgA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:content-language:in-reply-to:mime-version :user-agent:date:message-id:organization:autocrypt:openpgp:from :references:cc:to:subject; bh=xe+ARmEtb8xBh8MUVAlBnTfA466DDi1Opi/EgdkU/n0=; b=P2VAu+7iySFbAighWCsP6xkjSw6flXKvZFtbKilU7AJHhQAjQLZZ8v9Z4JyVYu57Ii 8lY+Q8d8DY4t33HWQSR8+RFP3xFOZDWaR3QuCO3w8J15hanL9bRIvlBu0WmRbYDZSuCk G20UvlFkdx+Cpue6D+FpCQE9eDm5GZynef+THMm59od8lCIwCefDAVZTKEEcwTL34jKW qjzWEOq6CB3E9YPreG9eVAbBM86mbnRhiyFrpwVoN9rLg9SpcVY+20tG5rAUV3W1kSFk OOHWCtFN9BH07c6gMKagCNVCn5MH0qbcZa/+nFdfJIDgAXrdqxNuvLxxt/vw7MtSj9QG lSXw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id 40si2038991qvi.197.2019.05.13.00.49.42 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 13 May 2019 00:49:42 -0700 (PDT) Received-SPF: pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com 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 A29043091753; Mon, 13 May 2019 07:49:40 +0000 (UTC) Received: from [10.36.117.84] (ovpn-117-84.ams2.redhat.com [10.36.117.84]) by smtp.corp.redhat.com (Postfix) with ESMTP id 28AF060856; Mon, 13 May 2019 07:49:30 +0000 (UTC) Subject: Re: [PATCH v2 3/8] mm/memory_hotplug: arch_remove_memory() and __remove_pages() with CONFIG_MEMORY_HOTPLUG To: Dan Williams , Michal Hocko , Oscar Salvador Cc: Linux MM , Linux Kernel Mailing List , linux-ia64@vger.kernel.org, linuxppc-dev , linux-s390 , Linux-sh , Andrew Morton , Tony Luck , Fenghua Yu , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Martin Schwidefsky , Heiko Carstens , Yoshinori Sato , Rich Felker , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Greg Kroah-Hartman , "Rafael J. Wysocki" , Mike Rapoport , "Kirill A. Shutemov" , Alex Deucher , "David S. Miller" , Mark Brown , Chris Wilson , Christophe Leroy , Nicholas Piggin , Vasily Gorbik , Rob Herring , Masahiro Yamada , "mike.travis@hpe.com" , Andrew Banman , Pavel Tatashin , Wei Yang , Arun KS , Qian Cai , Mathieu Malaterre , Baoquan He , Logan Gunthorpe References: <20190507183804.5512-1-david@redhat.com> <20190507183804.5512-4-david@redhat.com> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; prefer-encrypt=mutual; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwX4EEwECACgFAljj9eoCGwMFCQlmAYAGCwkI BwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEE3eEPcA/4Na5IIP/3T/FIQMxIfNzZshIq687qgG 8UbspuE/YSUDdv7r5szYTK6KPTlqN8NAcSfheywbuYD9A4ZeSBWD3/NAVUdrCaRP2IvFyELj xoMvfJccbq45BxzgEspg/bVahNbyuBpLBVjVWwRtFCUEXkyazksSv8pdTMAs9IucChvFmmq3 jJ2vlaz9lYt/lxN246fIVceckPMiUveimngvXZw21VOAhfQ+/sofXF8JCFv2mFcBDoa7eYob s0FLpmqFaeNRHAlzMWgSsP80qx5nWWEvRLdKWi533N2vC/EyunN3HcBwVrXH4hxRBMco3jvM m8VKLKao9wKj82qSivUnkPIwsAGNPdFoPbgghCQiBjBe6A75Z2xHFrzo7t1jg7nQfIyNC7ez MZBJ59sqA9EDMEJPlLNIeJmqslXPjmMFnE7Mby/+335WJYDulsRybN+W5rLT5aMvhC6x6POK z55fMNKrMASCzBJum2Fwjf/VnuGRYkhKCqqZ8gJ3OvmR50tInDV2jZ1DQgc3i550T5JDpToh dPBxZocIhzg+MBSRDXcJmHOx/7nQm3iQ6iLuwmXsRC6f5FbFefk9EjuTKcLMvBsEx+2DEx0E UnmJ4hVg7u1PQ+2Oy+Lh/opK/BDiqlQ8Pz2jiXv5xkECvr/3Sv59hlOCZMOaiLTTjtOIU7Tq 7ut6OL64oAq+zsFNBFXLn5EBEADn1959INH2cwYJv0tsxf5MUCghCj/CA/lc/LMthqQ773ga uB9mN+F1rE9cyyXb6jyOGn+GUjMbnq1o121Vm0+neKHUCBtHyseBfDXHA6m4B3mUTWo13nid 0e4AM71r0DS8+KYh6zvweLX/LL5kQS9GQeT+QNroXcC1NzWbitts6TZ+IrPOwT1hfB4WNC+X 2n4AzDqp3+ILiVST2DT4VBc11Gz6jijpC/KI5Al8ZDhRwG47LUiuQmt3yqrmN63V9wzaPhC+ xbwIsNZlLUvuRnmBPkTJwwrFRZvwu5GPHNndBjVpAfaSTOfppyKBTccu2AXJXWAE1Xjh6GOC 8mlFjZwLxWFqdPHR1n2aPVgoiTLk34LR/bXO+e0GpzFXT7enwyvFFFyAS0Nk1q/7EChPcbRb hJqEBpRNZemxmg55zC3GLvgLKd5A09MOM2BrMea+l0FUR+PuTenh2YmnmLRTro6eZ/qYwWkC u8FFIw4pT0OUDMyLgi+GI1aMpVogTZJ70FgV0pUAlpmrzk/bLbRkF3TwgucpyPtcpmQtTkWS gDS50QG9DR/1As3LLLcNkwJBZzBG6PWbvcOyrwMQUF1nl4SSPV0LLH63+BrrHasfJzxKXzqg rW28CTAE2x8qi7e/6M/+XXhrsMYG+uaViM7n2je3qKe7ofum3s4vq7oFCPsOgwARAQABwsFl BBgBAgAPBQJVy5+RAhsMBQkJZgGAAAoJEE3eEPcA/4NagOsP/jPoIBb/iXVbM+fmSHOjEshl KMwEl/m5iLj3iHnHPVLBUWrXPdS7iQijJA/VLxjnFknhaS60hkUNWexDMxVVP/6lbOrs4bDZ NEWDMktAeqJaFtxackPszlcpRVkAs6Msn9tu8hlvB517pyUgvuD7ZS9gGOMmYwFQDyytpepo YApVV00P0u3AaE0Cj/o71STqGJKZxcVhPaZ+LR+UCBZOyKfEyq+ZN311VpOJZ1IvTExf+S/5 lqnciDtbO3I4Wq0ArLX1gs1q1XlXLaVaA3yVqeC8E7kOchDNinD3hJS4OX0e1gdsx/e6COvy qNg5aL5n0Kl4fcVqM0LdIhsubVs4eiNCa5XMSYpXmVi3HAuFyg9dN+x8thSwI836FoMASwOl C7tHsTjnSGufB+D7F7ZBT61BffNBBIm1KdMxcxqLUVXpBQHHlGkbwI+3Ye+nE6HmZH7IwLwV W+Ajl7oYF+jeKaH4DZFtgLYGLtZ1LDwKPjX7VAsa4Yx7S5+EBAaZGxK510MjIx6SGrZWBrrV TEvdV00F2MnQoeXKzD7O4WFbL55hhyGgfWTHwZ457iN9SgYi1JLPqWkZB0JRXIEtjd4JEQcx +8Umfre0Xt4713VxMygW0PnQt5aSQdMD58jHFxTk092mU+yIHj5LeYgvwSgZN4airXk5yRXl SE+xAvmumFBY Organization: Red Hat GmbH Message-ID: Date: Mon, 13 May 2019 09:48:31 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: 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 [10.5.110.41]); Mon, 13 May 2019 07:49:41 +0000 (UTC) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 07.05.19 23:02, Dan Williams wrote: > On Tue, May 7, 2019 at 11:38 AM David Hildenbrand wrote: >> >> Let's prepare for better error handling while adding memory by allowing >> to use arch_remove_memory() and __remove_pages() even if >> CONFIG_MEMORY_HOTREMOVE is not set. CONFIG_MEMORY_HOTREMOVE effectively >> covers >> - Offlining of system ram (memory block devices) - offline_pages() >> - Unplug of system ram - remove_memory() >> - Unplug/remap of device memory - devm_memremap() >> >> This allows e.g. for handling like >> >> arch_add_memory() >> rc = do_something(); >> if (rc) { >> arch_remove_memory(); >> } >> >> Whereby do_something() will for example be memory block device creation >> after it has been factored out. > > What's left after this? Can we just get rid of CONFIG_MEMORY_HOTREMOVE > option completely when CONFIG_MEMORY_HOTPLUG is enabled? It's not > clear to me why there was ever the option to compile out the remove > code when the add code is included. > If there are no other comments, I will go ahead and rip out CONFIG_MEMORY_HOTREMOVE completely, gluing the functionality to CONFIG_MEMORY_HOTPLUG. -- Thanks, David / dhildenb