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Biederman" Cc: Waiman Long , Ingo Molnar , Will Deacon , Linux Kernel Mailing List , Alexey Gladkov , Oleg Nesterov References: <87blobnq02.fsf@x220.int.ebiederm.org> <87wo6or3pg.fsf@x220.int.ebiederm.org> <87imi8nzlw.fsf@x220.int.ebiederm.org> From: Bernd Edlinger Message-ID: Date: Sat, 11 Apr 2020 06:07:47 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: AM3PR07CA0107.eurprd07.prod.outlook.com (2603:10a6:207:7::17) To AM6PR03MB5170.eurprd03.prod.outlook.com (2603:10a6:20b:ca::23) X-Microsoft-Original-Message-ID: <7ca8b273-3222-b13f-51a5-53e70bba4074@hotmail.de> MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.1.101] (92.77.140.102) by AM3PR07CA0107.eurprd07.prod.outlook.com (2603:10a6:207:7::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2921.20 via Frontend Transport; Sat, 11 Apr 2020 04:07:48 +0000 X-Microsoft-Original-Message-ID: <7ca8b273-3222-b13f-51a5-53e70bba4074@hotmail.de> X-TMN: [bD67wqo8RC7fxLaBVOHOYug3Oq8KXNpF] X-MS-PublicTrafficType: Email X-IncomingHeaderCount: 50 X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-Correlation-Id: d8931ce9-20a8-4975-b29a-08d7ddcde601 X-MS-TrafficTypeDiagnostic: VE1EUR02HT127: X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: NNg9YWaKu0eZCfE4BxcH6qpMmuwwMseLeIJCCucsOBzVfytZTQ9kBphIRhIhkzWfL4pCGMnJuIKkAB5A+j2H+i0HPU1oWd/FcK4/z8SliCS519eM/ExIsryuXGzCAuflU4HfNLltKCcmmUHv5dryo/hd+fuy5UYB1tM4xdodyFY6gK7FJL/r6RFPWYy/sjUD X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:0;SRV:;IPV:NLI;SFV:NSPM;H:AM6PR03MB5170.eurprd03.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:;DIR:OUT;SFP:1901; X-MS-Exchange-AntiSpam-MessageData: yChoIlmXTVKsZzDse2wULXMFmWbPb2DKUVep6uuReiIBhgNBY2E91t57rdGYolzmJI2sOEu1TRfFlOwZW9sQgK+dSzXl/v8lMq6Io3n6CwEcnH6Pvft8DXuhBCRPVj9ezQYDFKc9f9R6JjOUZXQUNA== X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: d8931ce9-20a8-4975-b29a-08d7ddcde601 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Apr 2020 04:07:49.7297 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-FromEntityHeader: Internet X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: VE1EUR02HT127 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/10/20 2:32 AM, Linus Torvalds wrote: > On Thu, Apr 9, 2020 at 5:30 PM Linus Torvalds > wrote: >> >> Instead of trying to change how notify_count gets decremented, we >> could do something like the attached patch: wait for it to go down to >> zero, yes, but go back and re-check until you don't have to wait any >> more. That should fix the underflow situation. The comment says it >> all. > > The "attached" patch wasn't. > > Blush. > > Here it is. Still entirely and utterly untested. > Okay, if this works, please do not only make sure that our own test case works, but also that the strace-5.5 test suite does not regress. So currently at least one of the test cases was failing before my totally crazy patch. After my patch exactly the same test was failing. So please make sure you don't break their tests. Thanks Bernd. > Linus >