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Peter Anvin" , "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , Mario Limonciello , Tim Chen , Klaus Kusche Subject: [PATCH v2] x86/itmt: Don't make ITMT enablement depend on debugfs Date: Tue, 1 Sep 2026 07:34:04 -0500 Message-ID: <20260901123404.2503482-1-mario.limonciello@amd.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1PEPF00006000:EE_|SA3PR12MB297303:EE_ X-MS-Office365-Filtering-Correlation-Id: 81a94d45-6da9-4549-71db-08df08255cd8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|1800799024|82310400026|36860700016|376014|18002099003|56012099006|6133799003|10067099003|11063799006|5023799004; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(23010399003)(1800799024)(82310400026)(36860700016)(376014)(18002099003)(56012099006)(6133799003)(10067099003)(11063799006)(5023799004);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: oz8UvR3BVycyAQacytEsTvqa8b7+Bebnu/y+YJBjPb3wRDyZ+143t+uC6h3qV7IYVJIab07/MYluYjLjjr8QSM4HTkKkPU7LrKIJjphYatT5h5DnzqYxBUODS1+aPT0yR/U/AU9kwHwhvppqc5rDZulOTNbJaTBxAhfDmecxaRO4NQyMxcht/FJOCUACZ+1tBe1UH5XqVmsC2VtjFHjuevi5UGJkDpOl8mnbW13ziPz7yVly0UChu67tU97Loc/d9Ua0xUdH8bn6znJZ1O7X3fE9K1Qr0RDxY7hMzQe/6Y+PTXuJ6kPmUdO2ZeipIrDvn0QmnnEwZLUAYdsW8xP0XGURyoq0Y7WvbyWCgtKdLvCBrrN8HtkAkUxpbTdO3RvtC0qGBQmcW4aWD+//9w5d5mjwfRC8EI4MVIugd558c017pEvL2S3j28z7EVm5eARH X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Sep 2026 12:34:27.3984 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 81a94d45-6da9-4549-71db-08df08255cd8 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF00006000.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA3PR12MB297303 Content-Type: text/plain; charset="utf-8" sched_set_itmt_support() treats debugfs file creation failures as fatal. When CONFIG_DEBUG_FS is disabled, debugfs stubs return ERR_PTR(-ENODEV), causing ITMT to be silently disabled. debugfs is a debug-only facility; its return values should be ignored. Drop the fatal error handling and enable ITMT unconditionally. Reviewed-by: K Prateek Nayak Tested-by: K Prateek Nayak Reviewed-by: Tim Chen Fixes: d04013a4b21b ("x86/itmt: Move the "sched_itmt_enabled" sysctl to deb= ugfs") Reported-by: Klaus Kusche Signed-off-by: Mario Limonciello --- v2: * Pick up tags --- arch/x86/kernel/itmt.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/itmt.c b/arch/x86/kernel/itmt.c index 243a769fdd97b..85ebde361d6ae 100644 --- a/arch/x86/kernel/itmt.c +++ b/arch/x86/kernel/itmt.c @@ -110,18 +110,14 @@ int sched_set_itmt_support(void) arch_debugfs_dir, &sysctl_sched_itmt_enabled, &dfs_sched_itmt_fops); - if (IS_ERR_OR_NULL(dfs_sched_itmt)) { + if (IS_ERR(dfs_sched_itmt)) dfs_sched_itmt =3D NULL; - return -ENOMEM; - } =20 dfs_sched_core_prio =3D debugfs_create_file("sched_core_priority", 0644, arch_debugfs_dir, NULL, &sched_core_priority_fops); - if (IS_ERR_OR_NULL(dfs_sched_core_prio)) { + if (IS_ERR(dfs_sched_core_prio)) dfs_sched_core_prio =3D NULL; - return -ENOMEM; - } =20 sched_itmt_capable =3D true; =20 --=20 2.43.0