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 73309C07CA9 for ; Tue, 28 Nov 2023 15:19:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346749AbjK1PTg (ORCPT ); Tue, 28 Nov 2023 10:19:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52504 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344723AbjK1PTe (ORCPT ); Tue, 28 Nov 2023 10:19:34 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F520D64; Tue, 28 Nov 2023 07:19:40 -0800 (PST) Received: from mail.maildlp.com (unknown [172.18.186.231]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4SfmMY4dJZz6D8YK; Tue, 28 Nov 2023 23:19:21 +0800 (CST) Received: from lhrpeml500005.china.huawei.com (unknown [7.191.163.240]) by mail.maildlp.com (Postfix) with ESMTPS id 99D61140A9C; Tue, 28 Nov 2023 23:19:38 +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 15.1.2507.35; Tue, 28 Nov 2023 15:19:37 +0000 Date: Tue, 28 Nov 2023 15:19:37 +0000 From: Jonathan Cameron To: Russell King CC: , , , , , , , , , , , , , Salil Mehta , Jean-Philippe Brucker , , , James Morse , Huacai Chen , WANG Xuerui Subject: Re: [PATCH RFC 18/22] LoongArch: Switch over to GENERIC_CPU_DEVICES Message-ID: <20231128151937.000003f3@Huawei.com> In-Reply-To: References: 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: lhrpeml500005.china.huawei.com (7.191.163.240) To lhrpeml500005.china.huawei.com (7.191.163.240) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 07 Nov 2023 10:30:51 +0000 Russell King wrote: > From: James Morse > > Now that GENERIC_CPU_DEVICES calls arch_register_cpu(), which can be > overridden by the arch code, switch over to this to allow common code > to choose when the register_cpu() call is made. > > This allows topology_init() to be removed. > > This is an intermediate step to the logic being moved to drivers/acpi, > where GENERIC_CPU_DEVICES will do the work when booting with acpi=off. > > This is a subtle change. Originally: > - on boot, topology_init() would have marked present CPUs that > io_master() is true for as hotplug-incapable. > - if a CPU is hotplugged that is an io_master(), it can later be > hot-unplugged. > > The new behaviour is that any CPU that io_master() is true for will > now always be marked as hotplug-incapable, thus even if it was > hotplugged, it can no longer be hot-unplugged. > > This patch also has the effect of moving the registration of CPUs from > subsys to driver core initialisation, prior to any initcalls running. > > Signed-off-by: James Morse > Signed-off-by: Russell King (Oracle) Reviewed-by: Jonathan Cameron