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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2B1E5EDE9A4 for ; Thu, 14 Sep 2023 11:16:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231159AbjINLQY (ORCPT ); Thu, 14 Sep 2023 07:16:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54592 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237403AbjINLQV (ORCPT ); Thu, 14 Sep 2023 07:16:21 -0400 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 175071A5; Thu, 14 Sep 2023 04:16:17 -0700 (PDT) Received: from lhrpeml500005.china.huawei.com (unknown [172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4RmZTc4Qg3z6HJdP; Thu, 14 Sep 2023 19:14:28 +0800 (CST) Received: from localhost (10.202.227.76) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.31; Thu, 14 Sep 2023 12:16:13 +0100 Date: Thu, 14 Sep 2023 12:16:12 +0100 From: Jonathan Cameron To: James Morse CC: , , , , , , , , , Salil Mehta , Russell King , Jean-Philippe Brucker , , Subject: Re: [RFC PATCH v2 04/35] drivers: base: Move cpu_dev_init() after node_dev_init() Message-ID: <20230914121612.00006ac7@Huawei.com> In-Reply-To: <20230913163823.7880-5-james.morse@arm.com> References: <20230913163823.7880-1-james.morse@arm.com> <20230913163823.7880-5-james.morse@arm.com> Organization: Huawei Technologies Research and Development (UK) Ltd. X-Mailer: Claws Mail 4.1.0 (GTK 3.24.33; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.202.227.76] X-ClientProxiedBy: lhrpeml100003.china.huawei.com (7.191.160.210) To lhrpeml500005.china.huawei.com (7.191.163.240) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org On Wed, 13 Sep 2023 16:37:52 +0000 James Morse wrote: > NUMA systems require the node descriptions to be ready before CPUs are > registered. This is so that the node symlinks can be created in sysfs. > > Currently no NUMA platform uses GENERIC_CPU_DEVICES, meaning that CPUs > are registered by arch code, instead of cpu_dev_init(). Worth saying why this matters I think. I wrote a nice note on that being a possible problem path as node_dev_init() uses the results of cpu_dev_init() if CONFIG_GENERIC_CPU_DEVICES before seeing this comment and realizing you had it covered (sort of anyway). > > Move cpu_dev_init() after node_dev_init() so that NUMA architectures > can use GENERIC_CPU_DEVICES. > > Signed-off-by: James Morse > --- > drivers/base/init.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/base/init.c b/drivers/base/init.c > index 397eb9880cec..c4954835128c 100644 > --- a/drivers/base/init.c > +++ b/drivers/base/init.c > @@ -35,8 +35,8 @@ void __init driver_init(void) > of_core_init(); > platform_bus_init(); > auxiliary_bus_init(); > - cpu_dev_init(); > memory_dev_init(); > node_dev_init(); > + cpu_dev_init(); > container_dev_init(); > }