From patchwork Fri Feb 3 13:50:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Morse X-Patchwork-Id: 650523 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 25E15C636D6 for ; Fri, 3 Feb 2023 13:53:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233380AbjBCNxp (ORCPT ); Fri, 3 Feb 2023 08:53:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34896 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233234AbjBCNwv (ORCPT ); Fri, 3 Feb 2023 08:52:51 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 295AAA2A48; Fri, 3 Feb 2023 05:52:27 -0800 (PST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id F0A091596; Fri, 3 Feb 2023 05:53:08 -0800 (PST) Received: from eglon.cambridge.arm.com (eglon.cambridge.arm.com [10.1.196.177]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2F4423F71E; Fri, 3 Feb 2023 05:52:23 -0800 (PST) From: James Morse To: linux-pm@vger.kernel.org, loongarch@lists.linux.dev, kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org Cc: Marc Zyngier , Thomas Gleixner , Lorenzo Pieralisi , Mark Rutland , Sudeep Holla , Borislav Petkov , H Peter Anvin , Dave Hansen , Ingo Molnar , Will Deacon , Catalin Marinas , Huacai Chen , James Morse , Suzuki K Poulose , Oliver Upton , Len Brown , Rafael Wysocki , WANG Xuerui , Salil Mehta , Russell King , Jean-Philippe Brucker Subject: [RFC PATCH 08/32] x86/topology: Switch over to GENERIC_CPU_DEVICES Date: Fri, 3 Feb 2023 13:50:19 +0000 Message-Id: <20230203135043.409192-9-james.morse@arm.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230203135043.409192-1-james.morse@arm.com> References: <20230203135043.409192-1-james.morse@arm.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org 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. x86's struct cpus come from struct x86_cpu, which has no other members or users. Remove this and use the version defined by common code. 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. Signed-off-by: James Morse --- arch/x86/Kconfig | 1 + arch/x86/include/asm/cpu.h | 4 ---- arch/x86/kernel/topology.c | 19 +++---------------- 3 files changed, 4 insertions(+), 20 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 6a520c22c3eb..e1aaee2f8412 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -144,6 +144,7 @@ config X86 select GENERIC_CLOCKEVENTS_MIN_ADJUST select GENERIC_CMOS_UPDATE select GENERIC_CPU_AUTOPROBE + select GENERIC_CPU_DEVICES select GENERIC_CPU_VULNERABILITIES select GENERIC_EARLY_IOREMAP select GENERIC_ENTRY diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h index a0a62ac00e88..2955541abebb 100644 --- a/arch/x86/include/asm/cpu.h +++ b/arch/x86/include/asm/cpu.h @@ -23,10 +23,6 @@ static inline void prefill_possible_map(void) {} #endif /* CONFIG_SMP */ -struct x86_cpu { - struct cpu cpu; -}; - #ifdef CONFIG_HOTPLUG_CPU extern void arch_unregister_cpu(int); extern void start_cpu0(void); diff --git a/arch/x86/kernel/topology.c b/arch/x86/kernel/topology.c index 1b83377274b8..2275e22dfc8b 100644 --- a/arch/x86/kernel/topology.c +++ b/arch/x86/kernel/topology.c @@ -35,8 +35,6 @@ #include #include -static DEFINE_PER_CPU(struct x86_cpu, cpu_devices); - #ifdef CONFIG_HOTPLUG_CPU #ifdef CONFIG_BOOTPARAM_HOTPLUG_CPU0 @@ -131,15 +129,15 @@ int arch_register_cpu(int num) } } if (num || cpu0_hotpluggable) - per_cpu(cpu_devices, num).cpu.hotpluggable = 1; + per_cpu(cpu_devices, num).hotpluggable = 1; - return register_cpu(&per_cpu(cpu_devices, num).cpu, num); + return register_cpu(&per_cpu(cpu_devices, num), num); } EXPORT_SYMBOL(arch_register_cpu); void arch_unregister_cpu(int num) { - unregister_cpu(&per_cpu(cpu_devices, num).cpu); + unregister_cpu(&per_cpu(cpu_devices, num)); } EXPORT_SYMBOL(arch_unregister_cpu); #else /* CONFIG_HOTPLUG_CPU */ @@ -149,14 +147,3 @@ static int __init arch_register_cpu(int num) return register_cpu(&per_cpu(cpu_devices, num).cpu, num); } #endif /* CONFIG_HOTPLUG_CPU */ - -static int __init topology_init(void) -{ - int i; - - for_each_present_cpu(i) - arch_register_cpu(i); - - return 0; -} -subsys_initcall(topology_init);