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Tue, 22 Jul 2025 16:08:47 +0000 From: Date: Tue, 22 Jul 2025 09:08:44 -0700 To: Akinobu Mita , Andrew Morton CC: , Message-ID: <687fb78c8d44b_134cc7100f@dwillia2-xfh.jf.intel.com.notmuch> In-Reply-To: References: <20250719112604.25500-1-akinobu.mita@gmail.com> <20250719163144.7524cfec1fe2041742608f80@linux-foundation.org> Subject: Re: [PATCH] resource: fix false warning in __request_region() Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: BY3PR10CA0010.namprd10.prod.outlook.com (2603:10b6:a03:255::15) To PH8PR11MB8107.namprd11.prod.outlook.com (2603:10b6:510:256::6) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR11MB8107:EE_|SJ0PR11MB6791:EE_ X-MS-Office365-Filtering-Correlation-Id: 08eb38ac-e823-4d29-a004-08ddc93a0a04 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024|7053199007; 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Are real world > > users hitting this? If so, should we backport this fix into earlier > > kernels? >=20 > This warning actually appeared on a machine with multiple cxl memory expa= nders. > One of the NUMA node id is 6, which is the same as the value of > IORES_DESC_DEVICE_PRIVATE_MEMORY. >=20 > In this environment it was just a spurious warning, but when I saw the wa= rning > I suspected a real problem so it's better to fix it. >=20 > Fixes: b926b7f3baec ("mm/resource: Move HMM pr_debug() deeper into > resource code") This should be: Fixes: 7dab174e2e27 ("dax/hmem: Move hmem device registration to dax_hmem.k= o") ...as that is the change that violates the assumptions of __request_region(). You can add: Reviewed-by: Dan Williams =