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From: Dmitry Safonov Message-ID: <096624be-802b-822d-36d7-2e6585e6f2b5@virtuozzo.com> Date: Wed, 21 Jun 2017 20:37:41 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0 MIME-Version: 1.0 In-Reply-To: <20170621173115.GA28723@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [195.214.232.6] X-ClientProxiedBy: HE1PR09CA0088.eurprd09.prod.outlook.com (2603:10a6:7:3d::32) To DB6PR0801MB1734.eurprd08.prod.outlook.com (2603:10a6:4:3a::21) X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DB6PR0801MB1734: X-MS-Office365-Filtering-Correlation-Id: b794149f-8603-4dda-8eba-08d4b8cc3a45 X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:(22001)(201703131423075)(201703031133081);SRVR:DB6PR0801MB1734; X-Microsoft-Exchange-Diagnostics: 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1;DB6PR0801MB1734;20:htSkPmKsQy+KXI4SQwYKeGcCxdn8M2qT+WHuOJfoHR3/h+v8nIxeDylQMujmG2iW5LDTFj48sz88obB8zrEb45sutPW4kFosMNXNXIYvZ/WRZLtLjS45I8uXv7rKsRBbm+WlZ/LzjGjNZW5ybN9eyVBrtZHsvCplFerwp7nR3C8= X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Jun 2017 17:37:44.5777 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB6PR0801MB1734 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 490 Lines: 20 On 06/21/2017 08:31 PM, Oleg Nesterov wrote: > On 06/21, Dmitry Safonov wrote: >> >> The only question I have - how is it connected to guard page? > > Because with stack guard page do_page_fault() almost never needs to > call expand_stack(), thus this check was almost never tested, I guess. > Probably it should go away now. Ah, indeed! Thanks for explanation. > > I'll write the changelog and patch tomorrow, unless someone does this > before. > > Oleg. > -- Dmitry