Received: by 2002:a05:6a10:9848:0:0:0:0 with SMTP id x8csp359302pxf; Wed, 24 Mar 2021 06:52:29 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxdK1u4R2RTOnIn9AIV2N9Rud1h/cCISpAaNa4kb+oMHZXptncm9wEBnEsZb9/56TJr39Ub X-Received: by 2002:a05:6402:b2d:: with SMTP id bo13mr3568430edb.120.1616593949598; Wed, 24 Mar 2021 06:52:29 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1616593949; cv=pass; d=google.com; s=arc-20160816; b=BpyHK3fvzcBFpwwcCUXg9LRMUpa+sL7f9uLuAfzx03x1nhw7VdgUD3ovho5kke6+bK JWS8JHRWNq88C5sjB3aGRLlYJG/AGMalGL8yKclY/IyV1z4tmbJ+wSzCI0DuJbB7bpov SoBuNUQP/yu9nuDUwP7VL9gVjVdartwS4qPB3Gz1DHhCdHpl0X1xCmCacmPDPPEuIT7i FsxrQ3yvtnyu7iKL6bWMD2g6QBxcGAWb4AkRv0wkH3kdVAMcgbXbFXGqazqVvYdci8Ax CzdiCmK/P9HTvOAh9i1aGn7f3/zyhZAq4vHkNH48+MLRRuIqdUUlyGaCb2HjzbPU8yPO Zfyg== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:content-language :content-transfer-encoding:in-reply-to:user-agent:date:message-id :organization:from:references:cc:to:subject:dkim-signature :dkim-signature; bh=Ew5rMYfIAd8SV6Ve5pweKkfGX6Lpv0bHrLvAL9s6dSc=; b=I84lBZVEmPm3Hg6WqIXifJv4v8MYb76HyKHTLkhykrArV+0uz+SgyX5sj9khZkezuG kQu70mvVgk8bIW9zKyWCu+aEQIPOaTMV1ICxdXzzfqDFAeRkp3lagkXb8E2jUF93rPqV uMrS6ULSqYCR8H/YJmiyoyjDzA5uYYC9ksGEFgncyc3MK/IBdaCCvRWwDs11iuOEo1sz nNniUH+slt9dt9G35F0ITpwbJcubTdksF/03d2a39hEINWUifJDn/AluTuo7r/NcHnvw LJS0Y3tCKgaRXlsGBGUi3f8eZKO7quHIjzxlH3MMwvQaWBhZhMMJ5TXulQRjbsb5o3PD B+aw== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2020-01-29 header.b=jHlltT1r; dkim=pass header.i=@oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=b9u4+tmC; arc=pass (i=1 spf=pass spfdomain=oracle.com dkim=pass dkdomain=oracle.com dmarc=pass fromdomain=oracle.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id bo5si1719180edb.459.2021.03.24.06.52.06; Wed, 24 Mar 2021 06:52:29 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2020-01-29 header.b=jHlltT1r; dkim=pass header.i=@oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=b9u4+tmC; arc=pass (i=1 spf=pass spfdomain=oracle.com dkim=pass dkdomain=oracle.com dmarc=pass fromdomain=oracle.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235668AbhCXNuk (ORCPT + 99 others); Wed, 24 Mar 2021 09:50:40 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:55002 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235671AbhCXNuJ (ORCPT ); Wed, 24 Mar 2021 09:50:09 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 12ODmo0T062078; Wed, 24 Mar 2021 13:49:46 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=subject : to : cc : references : from : message-id : date : in-reply-to : content-type : content-transfer-encoding : mime-version; s=corp-2020-01-29; bh=Ew5rMYfIAd8SV6Ve5pweKkfGX6Lpv0bHrLvAL9s6dSc=; b=jHlltT1rHwfZzUnAJFBXWhuhM9hqxoCwW8M/IyQAfFpYrrLiC5XaA93GJAHfHC9WEZYW LH8KFqovlngDh7NNpUpcKbinNwrAyMfiZWRfS4z27YYDm8fIojy6rI4jZKsWFAsoVQFf RI/4IrdE2GQzj+cfhrvBaBfb8egUSuLf8Uxl4Hjgt76FVPa3+61s90Rxe7mLjFpIEjs6 g0JH5Uy7gAhEcBESiGVpe1FiopepQNtUWMIo7KO64yBoL7Z69KczVT6uqJaL9g1ukgN/ AtZBekDWUjgU7q0L8bO3ZolUfRqQLbGG+J9abc2XrEdiVyvjLkmSFYzfzvD5Vfx+Y/b1 rw== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by userp2130.oracle.com with ESMTP id 37d8frat0t-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 24 Mar 2021 13:49:45 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 12ODfIBd073934; Wed, 24 Mar 2021 13:49:45 GMT Received: from nam04-dm6-obe.outbound.protection.outlook.com (mail-dm6nam08lp2046.outbound.protection.outlook.com [104.47.73.46]) by aserp3030.oracle.com with ESMTP id 37dtmqunqh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 24 Mar 2021 13:49:44 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=JLuNaITlnNeqKSDWa+vyXKLr6a0TJhDhuO6bnZZRMLZCg8PYvDp5QpLep7BeYun4Qk0AKzRnN8b+GcfkhLGcHZedJGpN964R8FNMNjSqiHVwZY1Yl9F6yzVlUSZfAlLW+3X8k4mowaK58PomOzr6NTkMcI6Cl7N4jEhWOcrHf5cvQCuzaA8GjI2PedFt+xmPpQWaypAtyqQd1TO+Kp+L04d+xuryWuEhM/VfCm0PPZ3YkaypigrfceuI1ya7gQUdZfoSnmMcRUhAR3Yo5i20gFha3JLf1P7SGtTiNsEmGWLiUpViuofrm2T50Bisc6IDHAPMgxTQ0PnTsPqy/n6xGg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=Ew5rMYfIAd8SV6Ve5pweKkfGX6Lpv0bHrLvAL9s6dSc=; b=DUXKLRufoPHKw4XQ8D4SS/XMi6ofsyYdSOe/BjIyJM6HppROMl/JAD3JYG3JWWtiAyAaEhwGexo3ySmjBESrsE4px841GSN5pX93rt5ilCJ7FLh1/lPwMTvljvMC+zJGHMlpvh2BZiliEEJvUkEwrkVqMSOyCE4Jwe7qrheXgBq99ONjmcpoi0WIOT4VNGEfmmBrY9YhM4XRZsiiOZMue2JNz1tcfmGvuupEXPbDpl5TBdN+3tc0tahmb091bDnbRqckjcRiemSp0ALXGqbP9GeNPR6MJ5JWAiiDbt1KhTeLTPSYUDWPN9SS/ck6WTudaWQdvd5MrH5qXv1zSqGPYw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=Ew5rMYfIAd8SV6Ve5pweKkfGX6Lpv0bHrLvAL9s6dSc=; b=b9u4+tmCI6lRQ8jqZARYdTQE/WUGQ3aIqQjDV6819o2YAtsal1bSSJKLaOdiGaPVFYiNnaPA8R6waR+zZQibZvpt2Onhl5CJF5fy09RhPPAPZJIA0FB330Wdg6Dzur1AXHNvWRfZvKgkR2suTw0uN2nCrQkba4XCupfDknk2uLc= Authentication-Results: kernel.org; dkim=none (message not signed) header.d=none;kernel.org; dmarc=none action=none header.from=oracle.com; Received: from DM6PR10MB3851.namprd10.prod.outlook.com (2603:10b6:5:1fb::17) by DM5PR1001MB2313.namprd10.prod.outlook.com (2603:10b6:4:2c::26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.24; Wed, 24 Mar 2021 13:49:43 +0000 Received: from DM6PR10MB3851.namprd10.prod.outlook.com ([fe80::5c53:869:7452:46da]) by DM6PR10MB3851.namprd10.prod.outlook.com ([fe80::5c53:869:7452:46da%3]) with mapi id 15.20.3955.027; Wed, 24 Mar 2021 13:49:43 +0000 Subject: Re: [PATCH] ACPI: tables: x86: Reserve memory occupied by ACPI tables To: "Rafael J. Wysocki" , Mike Rapoport Cc: "Rafael J. Wysocki" , ACPI Devel Maling List , Erik Kaneda , David Hildenbrand , Robert Moore , Rafael Wysocki , Len Brown , Linux Kernel Mailing List , Konrad Rzeszutek Wilk , Dan Carpenter , Dhaval Giani , Andrew Morton , Vlastimil Babka , Oscar Salvador , Wei Yang , Pankaj Gupta , Michal Hocko , x86 Maintainers References: <3236337.DtqTXxM43S@kreacher> <4650320.31r3eYUQgx@kreacher> From: George Kennedy Organization: Oracle Corporation Message-ID: <80dc595a-235e-ff9b-a564-6731186b19f5@oracle.com> Date: Wed, 24 Mar 2021 09:49:40 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Originating-IP: [108.26.147.230] X-ClientProxiedBy: CH2PR02CA0013.namprd02.prod.outlook.com (2603:10b6:610:4e::23) To DM6PR10MB3851.namprd10.prod.outlook.com (2603:10b6:5:1fb::17) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.1.222] (108.26.147.230) by CH2PR02CA0013.namprd02.prod.outlook.com (2603:10b6:610:4e::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.24 via Frontend Transport; Wed, 24 Mar 2021 13:49:41 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: f674c124-ae8c-49e3-5299-08d8eecbad49 X-MS-TrafficTypeDiagnostic: DM5PR1001MB2313: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM6PR10MB3851.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(366004)(396003)(346002)(136003)(39860400002)(376002)(186003)(36756003)(6486002)(66556008)(66476007)(83380400001)(478600001)(36916002)(7416002)(16576012)(86362001)(66946007)(316002)(54906003)(966005)(110136005)(5660300002)(31696002)(16526019)(26005)(44832011)(2906002)(2616005)(53546011)(4326008)(38100700001)(31686004)(8676002)(8936002)(956004)(43740500002)(45980500001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?VWNFTFg3YlJXdHpjTUc3cWdhOFBHMEVPU1ZyR1JSNllVcFJCNkhwQWJ0ZHdw?= =?utf-8?B?T0ZjY09walE2TTR6dndycHlrMlBpNVRWV3h5VnBpVWJMWlczUXJJVHpvbER4?= =?utf-8?B?U1d1dGJscDVuUmlza2Rnc1hsVW8rejM1WVlwNno1TW02L0JJY042M2NjN2N0?= =?utf-8?B?TzZyV1V4dm42ZVk2Vll3anJDS2srYVlGOW9WR0lnb0pzSmlVRVEwS0t0ZjI5?= =?utf-8?B?cHpxVzlRay91Q3VzMkZXakZSMndEUW1mRVA4VzQ5ZUs1SXN2MEtqK3RHWWR5?= =?utf-8?B?dWRoaXlEUkVKZkhsbG1ma2pQN2NIUmU5ZS84eGxxYWJieDFkeWRLYjJWbnZk?= =?utf-8?B?SEsxNVpEeDUrRlJDelRzV2RyQzdxOSt4SVFyTlg4WmdmWE1tbVVta3c4bzBr?= =?utf-8?B?S2cvakVCYktka0JKbUFRTngyaUdlYytWOElnNHpvanFKaG1Zemp5NkVQb3NG?= =?utf-8?B?dTZSUGFYbmxVSnhSVDJzK3JsK2h4Zkg2L2VxUTZhU0wwT1VJbzR5UHRUemly?= =?utf-8?B?TXV5T2s1NVRVMHVWWEk4U0E1aW9qdW1RcnIzb3RzUXBKWmlaTlNvK3ZxMUY5?= =?utf-8?B?OG4vSStWVitWdkJaUzd4ZHpXWXV5YnBGc0ZiYllIeTNFc0EvQ2lNSDY3ZVFl?= =?utf-8?B?dzRxQ2k2K09Lb3NLa1R0UXo4ejA4K3ZxQUppYytjQndPUWxIa0oxbDJJdFpD?= =?utf-8?B?VjBsejcrQUkrbmg1YXN6U0sxaUtXNjVzQzR4WkNCOVlDZU5vc2pLMDRBNHpr?= =?utf-8?B?eWcvblhPd3BJK1hqcUdjUWp6YVFUeXNBZ0hKTlVnMk1sRU1sWTg3VDJuMFVS?= =?utf-8?B?QXFBdUpEZXptM2Y0K29VZnZWRWc1aDZ1N1RIR3dtVmhxZ09YRUVEWkJHdEJY?= =?utf-8?B?NnU0S0I4TEdOS3FJeXpDeVAvVEFlOGQvSWw1ZzlwdHc4eVVIT3RnalJaRW1D?= =?utf-8?B?MWlEenhLUkM2Y29ObkFPNEgvckFLUEJ3N3ZERjdXaVpCSjNmcW9zUnhSWm1C?= =?utf-8?B?d0pTTU5wZGpLSEtBVlBSVTd6RTM3L09lLzdxbktXVmZvcEc5OTREaHpJS3U3?= =?utf-8?B?QU80NTJDbnRNdlBaVEQybWhXbXJZcE0rb1cvam9MNEl2TW1McnB2c0NJMnlT?= =?utf-8?B?cHZyd0VjcSs1d3gxbzFhdUpOZGFLSnNGWE1UN0V2aXlZdFFOUzZyUlJHRkx5?= =?utf-8?B?OERhQzRreWlzdGpXMlc5dEkwUmV1dEkxRzVEVEpna3FMczErT0owZmdJTEJQ?= =?utf-8?B?clg2Z016UTNrV1dHYXRGSDV6N0tPRkdGMitFdVFSWGVOY3czL0tDaGZ4bU9T?= =?utf-8?B?c0dzekZtK3A4Q2VLems5b2h5UGxCR2tpNHROYml6WXBNNk93anpiZ3ZuSjVp?= =?utf-8?B?MGt5RnQ5OHB0bEQzN25rN201MTVEY3Fsd0pJR0xOY1A3Uzk5OEpDbGd0NWM1?= =?utf-8?B?STlJVDFDMHNKVTJvanJUeGUveStqK2NGK2JsblhHbDVWM00zd1NjOGxONU5H?= =?utf-8?B?OUgyamR6MWFmQXBDWnVCdXBzYzl3eGZ4bkQ1dFBBRXA4M2ZnbVhmdXJ6d0t6?= =?utf-8?B?RmxROGlFQzFvT2M3bmwxM3I3d1BOMTdjdFBOc3JRTFI4ZGxEYVZmR0hQM2dR?= =?utf-8?B?Wmx0UUlGZWZMSkEwajVOYkhjTWtMVGQySnVHUFB0ODlibVBXMEtpcmVRUHV4?= =?utf-8?B?czVDWEpWMDBxSi9EYks4RWM4b2JxVG9aM0F4Tm1yZDN3ZUVPazUrbHlrdG0r?= =?utf-8?Q?RpUizBjM8OflzquMZ6Qx7Icwg9iJhjujn1Hz1gZ?= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: f674c124-ae8c-49e3-5299-08d8eecbad49 X-MS-Exchange-CrossTenant-AuthSource: DM6PR10MB3851.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Mar 2021 13:49:42.8409 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 5l0YQp5h9169ujdY0svUiNiqjFNVGwGjqnworG0wT8iPOEg3GiFgZ6gxNzwBumihgehZbLaRQLgS2I18KR0MUsOKoW1UTxGwDoV42ULf3FM= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR1001MB2313 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9932 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 mlxscore=0 phishscore=0 bulkscore=0 suspectscore=0 malwarescore=0 mlxlogscore=999 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2103240104 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9932 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 lowpriorityscore=0 priorityscore=1501 impostorscore=0 spamscore=0 mlxscore=0 suspectscore=0 mlxlogscore=999 phishscore=0 bulkscore=0 adultscore=0 malwarescore=0 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2103240105 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/24/2021 9:27 AM, Rafael J. Wysocki wrote: > On Wed, Mar 24, 2021 at 9:24 AM Mike Rapoport wrote: >> On Tue, Mar 23, 2021 at 08:26:52PM +0100, Rafael J. Wysocki wrote: >>> From: Rafael J. Wysocki >>> >>> The following problem has been reported by George Kennedy: >>> >>> Since commit 7fef431be9c9 ("mm/page_alloc: place pages to tail >>> in __free_pages_core()") the following use after free occurs >>> intermittently when ACPI tables are accessed. >>> >>> BUG: KASAN: use-after-free in ibft_init+0x134/0xc49 >>> Read of size 4 at addr ffff8880be453004 by task swapper/0/1 >>> CPU: 3 PID: 1 Comm: swapper/0 Not tainted 5.12.0-rc1-7a7fd0d #1 >>> Call Trace: >>> dump_stack+0xf6/0x158 >>> print_address_description.constprop.9+0x41/0x60 >>> kasan_report.cold.14+0x7b/0xd4 >>> __asan_report_load_n_noabort+0xf/0x20 >>> ibft_init+0x134/0xc49 >>> do_one_initcall+0xc4/0x3e0 >>> kernel_init_freeable+0x5af/0x66b >>> kernel_init+0x16/0x1d0 >>> ret_from_fork+0x22/0x30 >>> >>> ACPI tables mapped via kmap() do not have their mapped pages >>> reserved and the pages can be "stolen" by the buddy allocator. >>> >>> Apparently, on the affected system, the ACPI table in question is >>> not located in "reserved" memory, like ACPI NVS or ACPI Data, that >>> will not be used by the buddy allocator, so the memory occupied by >>> that table has to be explicitly reserved to prevent the buddy >>> allocator from using it. >>> >>> In order to address this problem, rearrange the initialization of the >>> ACPI tables on x86 to locate the initial tables earlier and reserve >>> the memory occupied by them. >>> >>> The other architectures using ACPI should not be affected by this >>> change. >>> >>> Link: https://lore.kernel.org/linux-acpi/1614802160-29362-1-git-send-email-george.kennedy@oracle.com/ >>> Reported-by: George Kennedy >>> Signed-off-by: Rafael J. Wysocki >> FWIW: >> Reviewed-by: Mike Rapoport > Thank you! > > George, can you please try this patch on the affected system? Will do. George > >>> --- >>> arch/x86/kernel/acpi/boot.c | 25 ++++++++++++------------- >>> arch/x86/kernel/setup.c | 8 +++----- >>> drivers/acpi/tables.c | 42 +++++++++++++++++++++++++++++++++++++++--- >>> include/linux/acpi.h | 9 ++++++++- >>> 4 files changed, 62 insertions(+), 22 deletions(-) >>> >>> Index: linux-pm/arch/x86/kernel/acpi/boot.c >>> =================================================================== >>> --- linux-pm.orig/arch/x86/kernel/acpi/boot.c >>> +++ linux-pm/arch/x86/kernel/acpi/boot.c >>> @@ -1554,10 +1554,18 @@ void __init acpi_boot_table_init(void) >>> /* >>> * Initialize the ACPI boot-time table parser. >>> */ >>> - if (acpi_table_init()) { >>> + if (acpi_locate_initial_tables()) >>> disable_acpi(); >>> - return; >>> - } >>> + else >>> + acpi_reserve_initial_tables(); >>> +} >>> + >>> +int __init early_acpi_boot_init(void) >>> +{ >>> + if (acpi_disabled) >>> + return 1; >>> + >>> + acpi_table_init_complete(); >>> >>> acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf); >>> >>> @@ -1570,18 +1578,9 @@ void __init acpi_boot_table_init(void) >>> } else { >>> printk(KERN_WARNING PREFIX "Disabling ACPI support\n"); >>> disable_acpi(); >>> - return; >>> + return 1; >>> } >>> } >>> -} >>> - >>> -int __init early_acpi_boot_init(void) >>> -{ >>> - /* >>> - * If acpi_disabled, bail out >>> - */ >>> - if (acpi_disabled) >>> - return 1; >>> >>> /* >>> * Process the Multiple APIC Description Table (MADT), if present >>> Index: linux-pm/arch/x86/kernel/setup.c >>> =================================================================== >>> --- linux-pm.orig/arch/x86/kernel/setup.c >>> +++ linux-pm/arch/x86/kernel/setup.c >>> @@ -1045,6 +1045,9 @@ void __init setup_arch(char **cmdline_p) >>> >>> cleanup_highmap(); >>> >>> + /* Look for ACPI tables and reserve memory occupied by them. */ >>> + acpi_boot_table_init(); >>> + >>> memblock_set_current_limit(ISA_END_ADDRESS); >>> e820__memblock_setup(); >>> >>> @@ -1136,11 +1139,6 @@ void __init setup_arch(char **cmdline_p) >>> >>> early_platform_quirks(); >>> >>> - /* >>> - * Parse the ACPI tables for possible boot-time SMP configuration. >>> - */ >>> - acpi_boot_table_init(); >>> - >>> early_acpi_boot_init(); >>> >>> initmem_init(); >>> Index: linux-pm/include/linux/acpi.h >>> =================================================================== >>> --- linux-pm.orig/include/linux/acpi.h >>> +++ linux-pm/include/linux/acpi.h >>> @@ -222,10 +222,14 @@ void __iomem *__acpi_map_table(unsigned >>> void __acpi_unmap_table(void __iomem *map, unsigned long size); >>> int early_acpi_boot_init(void); >>> int acpi_boot_init (void); >>> +void acpi_boot_table_prepare (void); >>> void acpi_boot_table_init (void); >>> int acpi_mps_check (void); >>> int acpi_numa_init (void); >>> >>> +int acpi_locate_initial_tables (void); >>> +void acpi_reserve_initial_tables (void); >>> +void acpi_table_init_complete (void); >>> int acpi_table_init (void); >>> int acpi_table_parse(char *id, acpi_tbl_table_handler handler); >>> int __init acpi_table_parse_entries(char *id, unsigned long table_size, >>> @@ -814,9 +818,12 @@ static inline int acpi_boot_init(void) >>> return 0; >>> } >>> >>> +static inline void acpi_boot_table_prepare(void) >>> +{ >>> +} >>> + >>> static inline void acpi_boot_table_init(void) >>> { >>> - return; >>> } >>> >>> static inline int acpi_mps_check(void) >>> Index: linux-pm/drivers/acpi/tables.c >>> =================================================================== >>> --- linux-pm.orig/drivers/acpi/tables.c >>> +++ linux-pm/drivers/acpi/tables.c >>> @@ -780,7 +780,7 @@ acpi_status acpi_os_table_override(struc >>> } >>> >>> /* >>> - * acpi_table_init() >>> + * acpi_locate_initial_tables() >>> * >>> * find RSDP, find and checksum SDT/XSDT. >>> * checksum all tables, print SDT/XSDT >>> @@ -788,7 +788,7 @@ acpi_status acpi_os_table_override(struc >>> * result: sdt_entry[] is initialized >>> */ >>> >>> -int __init acpi_table_init(void) >>> +int __init acpi_locate_initial_tables(void) >>> { >>> acpi_status status; >>> >>> @@ -803,9 +803,45 @@ int __init acpi_table_init(void) >>> status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); >>> if (ACPI_FAILURE(status)) >>> return -EINVAL; >>> - acpi_table_initrd_scan(); >>> >>> + return 0; >>> +} >>> + >>> +void __init acpi_reserve_initial_tables(void) >>> +{ >>> + int i; >>> + >>> + for (i = 0; i < ACPI_MAX_TABLES; i++) { >>> + struct acpi_table_desc *table_desc = &initial_tables[i]; >>> + u64 start = table_desc->address; >>> + u64 size = table_desc->length; >>> + >>> + if (!start || !size) >>> + break; >>> + >>> + pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n", >>> + table_desc->signature.ascii, start, start + size - 1); >>> + >>> + memblock_reserve(start, size); >>> + } >>> +} >>> + >>> +void __init acpi_table_init_complete(void) >>> +{ >>> + acpi_table_initrd_scan(); >>> check_multiple_madt(); >>> +} >>> + >>> +int __init acpi_table_init(void) >>> +{ >>> + int ret; >>> + >>> + ret = acpi_locate_initial_tables(); >>> + if (ret) >>> + return ret; >>> + >>> + acpi_table_init_complete(); >>> + >>> return 0; >>> } >>> >>> >>> >>> >> -- >> Sincerely yours, >> Mike.