From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=hRxk=V3=lists.ozlabs.org=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@kernel.org>
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=-2.5 required=3.0 tests=MAILING_LIST_MULTI,
	SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 1487DC0650F
	for <linuxppc-dev@archiver.kernel.org>; Tue, 30 Jul 2019 08:16:42 +0000 (UTC)
Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by mail.kernel.org (Postfix) with ESMTPS id 5EF822087F
	for <linuxppc-dev@archiver.kernel.org>; Tue, 30 Jul 2019 08:16:41 +0000 (UTC)
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5EF822087F
Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org
Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])
	by lists.ozlabs.org (Postfix) with ESMTP id 45yTsz0WzdzDqVB
	for <linuxppc-dev@archiver.kernel.org>; Tue, 30 Jul 2019 18:16:39 +1000 (AEST)
Authentication-Results: lists.ozlabs.org;
 spf=softfail (mailfrom) smtp.mailfrom=kernel.org
 (client-ip=195.135.220.15; helo=mx1.suse.de; envelope-from=mhocko@kernel.org;
 receiver=<UNKNOWN>)
Authentication-Results: lists.ozlabs.org;
 dmarc=fail (p=none dis=none) header.from=kernel.org
Received: from mx1.suse.de (mx2.suse.de [195.135.220.15])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (No client certificate requested)
 by lists.ozlabs.org (Postfix) with ESMTPS id 45yTqM23VrzDqQN
 for <linuxppc-dev@lists.ozlabs.org>; Tue, 30 Jul 2019 18:14:22 +1000 (AEST)
X-Virus-Scanned: by amavisd-new at test-mx.suse.de
Received: from relay2.suse.de (unknown [195.135.220.254])
 by mx1.suse.de (Postfix) with ESMTP id 59F32ABE9;
 Tue, 30 Jul 2019 08:14:18 +0000 (UTC)
Date: Tue, 30 Jul 2019 10:14:15 +0200
From: Michal Hocko <mhocko@kernel.org>
To: Hoan Tran OS <hoan@os.amperecomputing.com>
Subject: Re: [PATCH v2 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by
 default for NUMA
Message-ID: <20190730081415.GN9330@dhcp22.suse.cz>
References: <1562887528-5896-1-git-send-email-Hoan@os.amperecomputing.com>
 <20190712070247.GM29483@dhcp22.suse.cz>
 <586ae736-a429-cf94-1520-1a94ffadad88@os.amperecomputing.com>
 <20190712121223.GR29483@dhcp22.suse.cz>
 <20190712143730.au3662g4ua2tjudu@willie-the-truck>
 <20190712150007.GU29483@dhcp22.suse.cz>
 <730368c5-1711-89ae-e3ef-65418b17ddc9@os.amperecomputing.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <730368c5-1711-89ae-e3ef-65418b17ddc9@os.amperecomputing.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
X-BeenThere: linuxppc-dev@lists.ozlabs.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org>
List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>
List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev/>
List-Post: <mailto:linuxppc-dev@lists.ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>
List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>,
 "open list:MEMORY MANAGEMENT" <linux-mm@kvack.org>,
 Paul Mackerras <paulus@samba.org>, "H . Peter Anvin" <hpa@zytor.com>,
 "sparclinux@vger.kernel.org" <sparclinux@vger.kernel.org>,
 Alexander Duyck <alexander.h.duyck@linux.intel.com>,
 Will Deacon <will@kernel.org>,
 "linux-s390@vger.kernel.org" <linux-s390@vger.kernel.org>,
 "x86@kernel.org" <x86@kernel.org>, "willy@infradead.org" <willy@infradead.org>,
 Mike Rapoport <rppt@linux.ibm.com>,
 Christian Borntraeger <borntraeger@de.ibm.com>, Ingo Molnar <mingo@redhat.com>,
 "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>,
 Catalin Marinas <catalin.marinas@arm.com>,
 Open Source Submission <patches@amperecomputing.com>,
 Pavel Tatashin <pavel.tatashin@microsoft.com>,
 Vasily Gorbik <gor@linux.ibm.com>, Will Deacon <will.deacon@arm.com>,
 Borislav Petkov <bp@alien8.de>, Thomas Gleixner <tglx@linutronix.de>,
 Vlastimil Babka <vbabka@suse.cz>, Oscar Salvador <osalvador@suse.de>,
 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
 Andrew Morton <akpm@linux-foundation.org>,
 "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
 "David S . Miller" <davem@davemloft.net>
Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

[Sorry for a late reply]

On Mon 15-07-19 17:55:07, Hoan Tran OS wrote:
> Hi,
> 
> On 7/12/19 10:00 PM, Michal Hocko wrote:
[...]
> > Hmm, I thought this was selectable. But I am obviously wrong here.
> > Looking more closely, it seems that this is indeed only about
> > __early_pfn_to_nid and as such not something that should add a config
> > symbol. This should have been called out in the changelog though.
> 
> Yes, do you have any other comments about my patch?

Not really. Just make sure to explicitly state that
CONFIG_NODES_SPAN_OTHER_NODES is only about __early_pfn_to_nid and that
doesn't really deserve it's own config and can be pulled under NUMA.

> > Also while at it, does HAVE_MEMBLOCK_NODE_MAP fall into a similar
> > bucket? Do we have any NUMA architecture that doesn't enable it?
> > 
> 
> As I checked with arch Kconfig files, there are 2 architectures, riscv 
> and microblaze, do not support NUMA but enable this config.
> 
> And 1 architecture, alpha, supports NUMA but does not enable this config.

Care to have a look and clean this up please?

-- 
Michal Hocko
SUSE Labs