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Thu, 22 May 2025 18:19:51 +0000 Date: Thu, 22 May 2025 11:19:47 -0700 From: Dan Williams To: Jonathan Cameron , Dan Williams CC: Itaru Kitayama , Dave Jiang , Subject: Re: Internal error: Oops: 0000000096000044 [#11] SMP Message-ID: <682f6ac3e7de3_1626e100a2@dwillia2-xfh.jf.intel.com.notmuch> References: <96235d4d-2bb7-4743-b519-0c35a9a21749@intel.com> <98DE3B2C-1393-4ED8-BB6A-E72D6131F97A@linux.dev> <71238a94-361f-4264-a5e4-510d428f5f66@intel.com> <682e62f8e7073_1626e10066@dwillia2-xfh.jf.intel.com.notmuch> <20250522145622.00002633@huawei.com> Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20250522145622.00002633@huawei.com> X-ClientProxiedBy: BYAPR04CA0023.namprd04.prod.outlook.com (2603:10b6:a03:40::36) 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_|SN7PR11MB7639:EE_ X-MS-Office365-Filtering-Correlation-Id: 29185cdc-8dda-42f4-4732-08dd995d3e2f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; 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That might be an > > assumption that only works for x86_64, not ARM64. I would double check > > that this code in cxl_test_init() > > > > rc = gen_pool_add(cxl_mock_pool, iomem_resource.end + 1 - SZ_64G, > > SZ_64G, NUMA_NO_NODE); > > if (rc) > > goto err_gen_pool_add; > > > > ...is not setting up CXL Windows that overlap with existing resources in > > that range. > > > > I think there are checks that block use of ranges up there. > > Print I'm seeing is > Hotplug memory [0xfffffff010000000-0xfffffff030000000] exceeds maximum addressable range [0x40000000-0xf80003fffffff] > > I think right answer is to use mhp_get_pluggable_range(true); to check > for limits on the range we can use. > > On architectures that don't define arch_get_mappable_range() > that ends up the as (unsigned long)-1 which I think would work > though there may be other stuff up there. Maybe min(iomem_resource.end + 1 - SZ_64G, > mappable_range.end + 1 - SZ_64G) > or something like that adapted to avoid wrap around. > > I haven't yet sanity checked this doesn't break x86 but I think it should > end up making no difference to the locations on x86. > > > With the below - all 11 tests in ndctl cxl test suite pass for me. It was whitespace clobbered but after fixing that up and adding #include , it works here, thanks! Reviewed-by: Dan Williams