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Rozycki" Cc: Thomas Bogendoerfer , Jiaxun Yang , linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, Huacai Chen References: <20260409164846.3176046-2-stefan.wiehler@nokia.com> <7fd22b08-d9af-4751-a6f3-6ef9c9205a2b@nokia.com> <4a414140-66d7-4114-9b36-e746573d4fa9@nokia.com> Content-Language: en-US From: Stefan Wiehler In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: FR3P281CA0023.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:1c::7) To AS1PR07MB8901.eurprd07.prod.outlook.com (2603:10a6:20b:480::5) Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AS1PR07MB8901:EE_|MI3PR07MB12339:EE_ X-MS-Office365-Filtering-Correlation-Id: afbcfdaf-89ce-4390-98d0-08ded76bf950 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|23010399003|1800799024|6133799003|4143699003|11063799006|56012099006|22082099003|18002099003; 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Would you be able to explain why > it triggers with QEMU and possibly the I6400 CPU in particular, but not on > real SMP hardware I have? From your commit description I infer this isn't > supposed to be a heisenbug. The only explanation that comes to my mind is that your platform has TLBINV support and never calls r4k_tlb_uniquify() [1], therefore skipping the kmalloc() call. Would you please verify that? Kind regards, Stefan [1] https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git/tree/arch/mips/mm/tlb-r4k.c?h=mips-fixes#n817