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Fri, 30 Jan 2026 17:45:31 +0000 From: Date: Fri, 30 Jan 2026 09:45:29 -0800 To: Alison Schofield , Davidlohr Bueso , Jonathan Cameron , "Dave Jiang" , Alison Schofield , Vishal Verma , Ira Weiny , "Dan Williams" CC: Message-ID: <697cee39ed313_1d6f100bd@dwillia2-mobl4.notmuch> In-Reply-To: <2a613604c0cdda6d9f838ae9b47ea6d936c5e4ce.1769746294.git.alison.schofield@intel.com> References: <3bcc5143777acc6d45675d78dd8c57079406bc53.1769746294.git.alison.schofield@intel.com> <2a613604c0cdda6d9f838ae9b47ea6d936c5e4ce.1769746294.git.alison.schofield@intel.com> Subject: Re: [PATCH 2/2] cxl/region: Unregister auto-created region when assembly fails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BYAPR01CA0056.prod.exchangelabs.com (2603:10b6:a03:94::33) To PH8PR11MB8107.namprd11.prod.outlook.com (2603:10b6:510:256::6) Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR11MB8107:EE_|IA3PR11MB9225:EE_ X-MS-Office365-Filtering-Correlation-Id: f3af38af-0d62-47f8-80da-08de60275cfd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014; 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Right, that is good forensics, administrator action is needed to figure out what to do next. > The region continues to reserve its memory resource, preventing DAX > from registering the memory. I would rather have the partially assemebled region to continue to exist. It can help debug the expected catastrophic error reports from DAX enabling access to a memory range that the CXL side can see has completely failed (lost an interleave member). If the failure is more benign and DAX side access is viable, then the forensics matter and userspace can cleanup.