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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 47050C43331 for ; Mon, 11 Nov 2019 19:00:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1CED42196E for ; Mon, 11 Nov 2019 19:00:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573498843; bh=PqiC49kc30tvGS27xJH3WX24/feVFXmbvnQN0nLxgJ0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=DPSXvJ17shd4/nO1bCzNICLgeJrVaudftaG8CRRK2yPFJz86z147rvPNNteYpiOwW 4HK/93W26XszCcooesKQNArqVLbJI1Fw2U0pgsxwf5gEJRfrMqx5Ojdu/oaNZgXycr c4pPVMeB6PfHxh1SYIpKezRMZRJGrTeyB6Inm8lI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728662AbfKKSx1 (ORCPT ); Mon, 11 Nov 2019 13:53:27 -0500 Received: from mail.kernel.org ([198.145.29.99]:48220 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729594AbfKKSx0 (ORCPT ); Mon, 11 Nov 2019 13:53:26 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 84078204EC; Mon, 11 Nov 2019 18:53:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573498405; bh=PqiC49kc30tvGS27xJH3WX24/feVFXmbvnQN0nLxgJ0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Xuc/M00klHF1RhOiVf2Sr2ckRCLv4V8otAusOpdOOv5n1UvJBvAmAcwI6Pnfl1TIS 8Hmhagjv/4DCOXaYKPuhdrJjUSCj3z13PveHn6ANxyYdH2appftpZXe3OQqzqVo7Ae h6wq8gXWP4FBy7mas9srWuyDMvIoAoL5QRvSyCxw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jan Beulich , Thomas Gleixner Subject: [PATCH 5.3 070/193] x86/apic/32: Avoid bogus LDR warnings Date: Mon, 11 Nov 2019 19:27:32 +0100 Message-Id: <20191111181506.275154395@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191111181459.850623879@linuxfoundation.org> References: <20191111181459.850623879@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jan Beulich commit fe6f85ca121e9c74e7490fe66b0c5aae38e332c3 upstream. The removal of the LDR initialization in the bigsmp_32 APIC code unearthed a problem in setup_local_APIC(). The code checks unconditionally for a mismatch of the logical APIC id by comparing the early APIC id which was initialized in get_smp_config() with the actual LDR value in the APIC. Due to the removal of the bogus LDR initialization the check now can trigger on bigsmp_32 APIC systems emitting a warning for every booting CPU. This is of course a false positive because the APIC is not using logical destination mode. Restrict the check and the possibly resulting fixup to systems which are actually using the APIC in logical destination mode. [ tglx: Massaged changelog and added Cc stable ] Fixes: bae3a8d3308 ("x86/apic: Do not initialize LDR and DFR for bigsmp") Signed-off-by: Jan Beulich Signed-off-by: Thomas Gleixner Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/666d8f91-b5a8-1afd-7add-821e72a35f03@suse.com Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/apic/apic.c | 28 +++++++++++++++------------- 1 file changed, 15 insertions(+), 13 deletions(-) --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -1573,9 +1573,6 @@ static void setup_local_APIC(void) { int cpu = smp_processor_id(); unsigned int value; -#ifdef CONFIG_X86_32 - int logical_apicid, ldr_apicid; -#endif if (disable_apic) { @@ -1616,16 +1613,21 @@ static void setup_local_APIC(void) apic->init_apic_ldr(); #ifdef CONFIG_X86_32 - /* - * APIC LDR is initialized. If logical_apicid mapping was - * initialized during get_smp_config(), make sure it matches the - * actual value. - */ - logical_apicid = early_per_cpu(x86_cpu_to_logical_apicid, cpu); - ldr_apicid = GET_APIC_LOGICAL_ID(apic_read(APIC_LDR)); - WARN_ON(logical_apicid != BAD_APICID && logical_apicid != ldr_apicid); - /* always use the value from LDR */ - early_per_cpu(x86_cpu_to_logical_apicid, cpu) = ldr_apicid; + if (apic->dest_logical) { + int logical_apicid, ldr_apicid; + + /* + * APIC LDR is initialized. If logical_apicid mapping was + * initialized during get_smp_config(), make sure it matches + * the actual value. + */ + logical_apicid = early_per_cpu(x86_cpu_to_logical_apicid, cpu); + ldr_apicid = GET_APIC_LOGICAL_ID(apic_read(APIC_LDR)); + if (logical_apicid != BAD_APICID) + WARN_ON(logical_apicid != ldr_apicid); + /* Always use the value from LDR. */ + early_per_cpu(x86_cpu_to_logical_apicid, cpu) = ldr_apicid; + } #endif /*