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 X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5DB12C433E2 for ; Mon, 22 Mar 2021 13:04:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 32F54619A8 for ; Mon, 22 Mar 2021 13:04:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229574AbhCVNEb (ORCPT ); Mon, 22 Mar 2021 09:04:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:47526 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231853AbhCVMvN (ORCPT ); Mon, 22 Mar 2021 08:51:13 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4D8E0619A9; Mon, 22 Mar 2021 12:45:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1616417146; bh=tSUZUQmkYHuJQC7Q0EFW9fCvt0nN3Dgz96VAiF+uOew=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RGWVtxjqUS7Ir7U7P3Lx6Dlsua/5v4J20WnVYhz0oYipyRAN+od7T0S7GotDKCjW0 45WdCmRNXCNh8WXhYUPotUmuUFdE8bOkI2nCMRslTaDNpE1XLikQRUcCbfwQdjZBNe zx1OVvpnXwazHkrnPfktbdXMMAXzhwSUeUR3iQ4E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold , Thomas Gleixner Subject: [PATCH 4.19 43/43] x86/apic/of: Fix CPU devicetree-node lookups Date: Mon, 22 Mar 2021 13:28:57 +0100 Message-Id: <20210322121921.318099121@linuxfoundation.org> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20210322121919.936671417@linuxfoundation.org> References: <20210322121919.936671417@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Johan Hovold commit dd926880da8dbbe409e709c1d3c1620729a94732 upstream. Architectures that describe the CPU topology in devicetree and do not have an identity mapping between physical and logical CPU ids must override the default implementation of arch_match_cpu_phys_id(). Failing to do so breaks CPU devicetree-node lookups using of_get_cpu_node() and of_cpu_device_node_get() which several drivers rely on. It also causes the CPU struct devices exported through sysfs to point to the wrong devicetree nodes. On x86, CPUs are described in devicetree using their APIC ids and those do not generally coincide with the logical ids, even if CPU0 typically uses APIC id 0. Add the missing implementation of arch_match_cpu_phys_id() so that CPU-node lookups work also with SMP. Apart from fixing the broken sysfs devicetree-node links this likely does not affect current users of mainline kernels on x86. Fixes: 4e07db9c8db8 ("x86/devicetree: Use CPU description from Device Tree") Signed-off-by: Johan Hovold Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/20210312092033.26317-1-johan@kernel.org Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/apic/apic.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -2279,6 +2279,11 @@ static int cpuid_to_apicid[] = { [0 ... NR_CPUS - 1] = -1, }; +bool arch_match_cpu_phys_id(int cpu, u64 phys_id) +{ + return phys_id == cpuid_to_apicid[cpu]; +} + #ifdef CONFIG_SMP /** * apic_id_is_primary_thread - Check whether APIC ID belongs to a primary thread