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[2620:137:e000::1:20]) by mx.google.com with ESMTP id mc17-20020a170906eb5100b00992f8116abdsi7207254ejb.480.2023.07.24.06.46.24; Mon, 24 Jul 2023 06:46:59 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linutronix.de header.s=2020 header.b="Zdsd/qAk"; dkim=neutral (no key) header.i=@linutronix.de; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230382AbjGXNfJ (ORCPT + 99 others); Mon, 24 Jul 2023 09:35:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36794 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231558AbjGXNeo (ORCPT ); Mon, 24 Jul 2023 09:34:44 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B5821FFE for ; Mon, 24 Jul 2023 06:34:18 -0700 (PDT) Message-ID: <20230724132045.555787669@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1690205652; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=c71eHbYg+VP7OJhjZCVHVzp0AtRxO5V4C+TDLxCJHes=; b=Zdsd/qAkSfkyv7R28hxTmnj8gmeJl+Sk5X2N8xiveIMJFkd8XPmRlQrXnd/6VX5U+F2lIF kNXiNRZdmjiuN3l4BMGRZifB9vSb3+pwS/9cMLK1WALqkQa1l8cTRQQ0FmQQ/XXnhnaeod Y3ImaBtA0xH3dmU7EECqoF+Us6O2qG2htggxB3Y6+CHulp/UcO7ton+jsg09i0B3d2Cuxb XiL49T9wHAWaofWRJs5bEJHbPgev7b90L66QjmYnGAQNmuYIkQz3essgRe6hO9mPOgJan3 KWrDU9HCFkFxZghZOCw4JFX8yNzFja2B7eDgJc4F8mD8LsI17fnZbkWD+4F07w== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1690205652; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=c71eHbYg+VP7OJhjZCVHVzp0AtRxO5V4C+TDLxCJHes=; b=ZeJdIWWQ5lDzV+3Aicl/OcNNEhnGtBOTGMXALhCu54bgHHASFrWxy2Obb3Ogq3bHihKxoB pJbSvCno/WGeh7CA== From: Thomas Gleixner To: LKML Cc: x86@kernel.org, Andrew Cooper , Tom Lendacky , Paolo Bonzini , Wei Liu , Arjan van de Ven , Juergen Gross , Michael Kelley , Peter Keresztes Schmidt , "Peter Zijlstra (Intel)" Subject: [patch V2 16/58] x86/apic: Sanitize num_processors handling References: <20230724131206.500814398@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Date: Mon, 24 Jul 2023 15:34:11 +0200 (CEST) X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org num_processors is 0 by default and only gets incremented when local APICs are registered. Make init_apic_mappings(), which tries to enable the local APIC in the case that no SMP configuration was found set num_processors to 1. This allows to remove yet another check for the local APIC and yet another place which registers the boot CPUs local APIC ID. Signed-off-by: Thomas Gleixner Acked-by: Peter Zijlstra (Intel) --- arch/x86/kernel/apic/apic.c | 9 ++++++--- arch/x86/kernel/smpboot.c | 18 ------------------ 2 files changed, 6 insertions(+), 21 deletions(-) --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -2130,9 +2130,12 @@ void __init init_apic_mappings(void) if (x2apic_mode) return; - if (!smp_found_config && !detect_init_APIC()) { - pr_info("APIC: disable apic facility\n"); - apic_disable(); + if (!smp_found_config) { + if (!detect_init_APIC()) { + pr_info("APIC: disable apic facility\n"); + apic_disable(); + } + num_processors = 1; } } --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1397,24 +1397,6 @@ early_param("possible_cpus", _setup_poss { int i, possible; - /* No processor was found in mptable or ACPI MADT */ - if (!num_processors) { - if (boot_cpu_has(X86_FEATURE_APIC)) { - int apicid = boot_cpu_physical_apicid; - int cpu = read_apic_id(); - - pr_warn("Boot CPU (id %d) not listed by BIOS\n", cpu); - - /* Make sure boot cpu is enumerated */ - if (apic->cpu_present_to_apicid(0) == BAD_APICID && - apic->apic_id_valid(apicid)) - generic_processor_info(apicid); - } - - if (!num_processors) - num_processors = 1; - } - i = setup_max_cpus ?: 1; if (setup_possible_cpus == -1) { possible = num_processors;