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Peter Anvin" , "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , Mario Limonciello , Klaus Kusche Subject: [PATCH] x86/itmt: Don't make ITMT enablement depend on debugfs Date: Tue, 11 Aug 2026 09:36:43 -0500 Message-ID: <20260811143643.378589-1-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 satlexmb09.amd.com (10.181.42.218) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF0002636E:EE_|PH0PR12MB7814:EE_ X-MS-Office365-Filtering-Correlation-Id: e784ca58-9ecc-4c19-beae-08def7b68f98 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700016|82310400026|376014|23010399003|6133799003|10067099003|11063799006|5023799004|56012099006|18002099003; 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)(1800799024)(36860700016)(82310400026)(376014)(23010399003)(6133799003)(10067099003)(11063799006)(5023799004)(56012099006)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: u152skrvufYTAqYLrN+1EnIN/P8K3BsMeobLXT8kXZdxKlM+TzP4Ivnnc3AKafJ72WCNUL/IFZIJKxH1jPw51FCvacUAqcFNracTUQs/DmOMA6RocVNkOSZ+hAneX1JlDkYEUtMgQYyvaA+HRrO8bWXhbJPBZVxkuOkNHhKjB4MZrssK8brk6J7CU2EYkM7RipV3Q2A2rsMWRIBQgXosKXhlPaxMQMz5qbdyZ7PsOocCQrHrD/x/IS+91wt5TvoDcQwcHogo6dkeVBoP74qtXbYYaZwHaqxP+pBdLXbAPHAjjwILRTx/zgCsk1PimUfiUwtFlLqvQKcV7DqF74t8cuaJJnIL2FkykhWoGG9gyMuy9ror8ZkxQxzw/3mVRYe0BduVrVGWbGVHUNuAG/lGkHYSwvUbmnRiQ5yC+Lq1T7uBThbVYWIqBfYjWmBqIvLU X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Aug 2026 14:40:59.8098 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e784ca58-9ecc-4c19-beae-08def7b68f98 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: SN1PEPF0002636E.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB7814 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. Fixes: d04013a4b21b ("x86/itmt: Move the "sched_itmt_enabled" sysctl to deb= ugfs") Reported-by: Klaus Kusche Signed-off-by: Mario Limonciello Reviewed-by: K Prateek Nayak --- 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