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 DC7FAEDE9A1 for ; Thu, 14 Sep 2023 09:56:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236955AbjINJ4X (ORCPT ); Thu, 14 Sep 2023 05:56:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41122 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237662AbjINJ4Q (ORCPT ); Thu, 14 Sep 2023 05:56:16 -0400 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [IPv6:2001:4d48:ad52:32c8:5054:ff:fe00:142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CD06CEB; Thu, 14 Sep 2023 02:56:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=nP1pXEvfpRxVMRlVL6GZ7KmnP0/koUCsxjP2bUE3Dxs=; b=QZN1Uv6McwaU/rZKUdGG+Y8SPi B7dnxNB7rM/FkA9uhd63tATvdH6mrqT6waXq7aOUCocqJjW2XSorFVS04zOfhFgKbmRXAGOk7vnIB NO9BnLrIGOkMT+hbqOg4lH3DBGFYGMiycW0wWo2D92yyBUaiXSPF+bkNUMCt2e/XPLlZuAx5q1LAn BBoybYriHPVqqXfM38rdRmxfE1JXJzNhK55UdWpTQnpQeogylo394JV6RPh5eTElanDlyddNiVKkP KS/2YVx5DItjEt1IbDBbx3X7N9CacN8OVAJD3QidDGfzAZSsQl6mCsnCrYoq+4ODxRpFm8VZxux05 wi7tKYNQ==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:57224) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1qgj4z-0003pl-34; Thu, 14 Sep 2023 10:56:09 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1qgj50-0004eo-LY; Thu, 14 Sep 2023 10:56:10 +0100 Date: Thu, 14 Sep 2023 10:56:10 +0100 From: "Russell King (Oracle)" To: James Morse Cc: linux-pm@vger.kernel.org, loongarch@lists.linux.dev, linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, kvmarm@lists.linux.dev, x86@kernel.org, Salil Mehta , Jean-Philippe Brucker , jianyong.wu@arm.com, justin.he@arm.com Subject: Re: [RFC PATCH v2 06/35] arm64: setup: Switch over to GENERIC_CPU_DEVICES using arch_register_cpu() Message-ID: References: <20230913163823.7880-1-james.morse@arm.com> <20230913163823.7880-7-james.morse@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230913163823.7880-7-james.morse@arm.com> Sender: Russell King (Oracle) Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org On Wed, Sep 13, 2023 at 04:37:54PM +0000, James Morse wrote: > To allow ACPI's _STA value to hide CPUs that are present, but not > available to online right now due to VMM or firmware policy, the > register_cpu() call needs to be made by the ACPI machinery when ACPI > is in use. This allows it to hide CPUs that are unavailable from sysfs. > > Switching to GENERIC_CPU_DEVICES is an intermediate step to allow all > five ACPI architectures to be modified at once. > > Switch over to GENERIC_CPU_DEVICES, and provide an arch_register_cpu() > that populates the hotpluggable flag. arch_register_cpu() is also the > interface the ACPI machinery expects. > > The struct cpu in struct cpuinfo_arm64 is never used directly, remove > it to use the one GENERIC_CPU_DEVICES provides. > > This changes the CPUs visible in sysfs from possible to present, but > on arm64 smp_prepare_cpus() ensures these are the same. > > Signed-off-by: James Morse Reviewed-by: Russell King (Oracle) -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!