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=-0.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 6B4F3C5CFFE for ; Tue, 11 Dec 2018 18:19:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 42BCE20851 for ; Tue, 11 Dec 2018 18:19:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 42BCE20851 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-pci-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727044AbeLKSTu (ORCPT ); Tue, 11 Dec 2018 13:19:50 -0500 Received: from mga12.intel.com ([192.55.52.136]:16729 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726878AbeLKSTu (ORCPT ); Tue, 11 Dec 2018 13:19:50 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Dec 2018 10:19:49 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,343,1539673200"; d="scan'208";a="117939479" Received: from ray.jf.intel.com (HELO [10.7.201.17]) ([10.7.201.17]) by orsmga001.jf.intel.com with ESMTP; 11 Dec 2018 10:19:49 -0800 Subject: Re: [PATCH V2] x86: Fix an issue with invalid ACPI NUMA config To: Jonathan Cameron , linux-pci@vger.kernel.org, x86@kernel.org, helgaas@kernel.org Cc: linuxarm@huawei.com, Ingo Molnar , Dave Hansen , Andy Lutomirski , Peter Zijlstra , martin@geanix.com References: <20181211094737.71554-1-Jonathan.Cameron@huawei.com> From: Dave Hansen Openpgp: preference=signencrypt Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: <20181211094737.71554-1-Jonathan.Cameron@huawei.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On 12/11/18 1:47 AM, Jonathan Cameron wrote: > When the PCI code later comes along and calls acpi_get_node() for any PCI > card below the root port, it navigates up the ACPI tree until it finds the > _PXM value in the root port. This value is then passed to > acpi_map_pxm_to_node(). > > As numa_off has not been set on x86 it tries to allocate a NUMA node, from > the unused set, without setting up all the infrastructure that would > normally accompany such a call. FWIW, this _sounds_ like the real problem here. We're allowing an allocation to proceed without some infrastructure that we require. Shouldn't we be detecting that this infrastructure is not in place and warn about *it* at least? I'm a bit worried that this is just papering over an unknown error to make a hang go away. It seems a bit too far away from the root cause.