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Shenoy" , K Prateek Nayak Subject: [PATCH v3 5/8] sched/core: Check for rcu_read_lock_any_held() in idle_get_state() Date: Tue, 20 Jan 2026 11:32:43 +0000 Message-ID: <20260120113246.27987-6-kprateek.nayak@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260120113246.27987-1-kprateek.nayak@amd.com> References: <20260120113246.27987-1-kprateek.nayak@amd.com> 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: BL02EPF00021F6F:EE_|CH3PR12MB9731:EE_ X-MS-Office365-Filtering-Correlation-Id: 3d786f1c-cad5-4adc-6931-08de5817e60a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|7416014|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?g8t1VVyMIuUU+YY/hsiTD32ulTutvv/frPIgrfcrB3+WBzUPUjrIk/8jTVZL?= =?us-ascii?Q?YHMQU51ZWJ1ZPmLKNiyL3cShJk+s5alD+eLC1ERbrLfSPw/YZs5nuSO2Yx4S?= =?us-ascii?Q?w4kWHXnEzGn6budM/zDhfP3yLhb65QRzmPi7FnhEqtcLnhgC4L5Yi8NDgzr5?= =?us-ascii?Q?Kz3rENCPJ9CMnIFLb1OBUcVKNtdlgBYUdB8eb5lDYAAOyXppvo8hpSb+3AA2?= =?us-ascii?Q?4tBW2eVdhQUJrf+veNW/ErUi3965pCum8l6Rb+EuzSM6uezGgnPyZ9buYKXX?= =?us-ascii?Q?yBRYKFaWUIcpNZxChuZypsX38eFhzj/0okYVcv3QfRPK+jGuA4X342yG+nfW?= =?us-ascii?Q?9hSvBNWBdHWbhtZGBfYNecNn8pt8bydvhvW/ZOeHCIBOyHB6Rb1U75uGoJ3/?= =?us-ascii?Q?RBwL4EXZWYL7u4H2vI97I4XOeXsnH6uUlShLOqo2uducFnSJXpSoYUMUuc/e?= =?us-ascii?Q?HrPq34ZjGtiAs5UpIhU0a9Kzq9sRDo6wNL1VRVBMGmxIONIyOBqCWNNXYsEW?= =?us-ascii?Q?/mvVU4ScGfWrbXcjTBg/+vA6AYo+trdnuBq9ruOha5NCyyWuQweZ+5sEETwO?= =?us-ascii?Q?L6WTp4yCBmPK0/YyqNkVqtXrHGKUrBneKGqAMoEv101WV5UR0S3tkSaZGE3g?= =?us-ascii?Q?crQXAA9GrhMNdxdW4IpyIMN7EcA+iRX36uINd9PL8VF7jLb7PBVi5GduftjC?= =?us-ascii?Q?o4kT6uQClcAGnSgl4xnZAnIM/zgeOSnFx+alg2qwmt4AzOHN3TEk2WDBzjth?= =?us-ascii?Q?XGknYPLzzLLqaDHzGYJBb74EdsLKAZ6us5LQBCwALjnbzQ0IQqDpMvR2yzZj?= =?us-ascii?Q?itIeWeJWsea5tfN+X/Wza0cKl2thr8JWNkvOIH94W+5VuJKSdJaXUuD4pN1y?= =?us-ascii?Q?WzeV053Vos0Jxt2m0R21UX5yKqZkkhnEfToJ8G9BImjTQC6AeJTdKXuc0eKN?= =?us-ascii?Q?YVTteU7TrO0KHM+qDG5sxsN2vwVxO2l/TPrhNFV6A+D4P5elYcDpeb8g3ErA?= =?us-ascii?Q?WAJBtYOOOJZjgV9cG2bKMXvC+mqGfSWG+bdlNsqVCrYfYXElnNRh/uMs+91S?= =?us-ascii?Q?HMsYJqPRYR9pnCgnaAcao3/u5i4PmKl/AWHUKvL65MmXunclVCPTXKkLKGRv?= =?us-ascii?Q?zXFyJx1g8TZbHRYfKnYxa8wNIFv9ysknB1aSaAi649iKQfTkjZlfxyYZwfUM?= =?us-ascii?Q?tmQQMoZp8IrmMzB+qBpQ8F1ST8NnAyLr48lsu19Xk1NRgLsPwWbimIs3n0DY?= =?us-ascii?Q?NDBCQvqBQbPm6NZwu/IWJSyP8NqnMC+HLbQHvwSlkdkvgSu9JGuGe+9dSB79?= =?us-ascii?Q?Qv+3lU8jduYnTwlPuTdiEx6GwEzciU1zGie3oKj5woG6AH2akvdgO9+2Gelg?= =?us-ascii?Q?8E7+9mbs2hE928MKwiZ7etLBzEU+xrVAB5dlCT8xDzJoMRxs1nOr/UQcdwkP?= =?us-ascii?Q?qarZrohjspDQDP4c5AnKbJ8eY090sb7/nmJOroQe4QoPn9OSqBaxrTtt4++c?= =?us-ascii?Q?VM2iluAxvETgO/qJC4iKda40i64536KDGOWPDXAxdmpfY1rEF+MRY+rP9R1a?= =?us-ascii?Q?Sfr28qEeD5BvEeTfL96QjPNjzXu4j+GPjN6y/Lef7yy8X6KECirPpDJb/Dh4?= =?us-ascii?Q?FBSusPDM6pPRXc+M5GcWTQVVSoH0MgBiBWeY7mqI4giv6+uSdBAUe5tjzCZQ?= =?us-ascii?Q?AkzPgg=3D=3D?= 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)(82310400026)(376014)(7416014)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jan 2026 11:34:39.9688 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3d786f1c-cad5-4adc-6931-08de5817e60a 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: BL02EPF00021F6F.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB9731 Content-Type: text/plain; charset="utf-8" Similar to commit 71fedc41c23b ("sched/fair: Switch to rcu_dereference_all()"), switch to checking for rcu_read_lock_any_held() in idle_get_state() to allow removing superfluous rcu_read_lock() regions in the fair task's wakeup path where the pi_lock is held and IRQs are disabled. Signed-off-by: K Prateek Nayak --- Changelog rfc v2..v3: o New patch. --- kernel/sched/sched.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 58c9d244f12b..14fc9fca2502 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2783,7 +2783,7 @@ static inline void idle_set_state(struct rq *rq, =20 static inline struct cpuidle_state *idle_get_state(struct rq *rq) { - WARN_ON_ONCE(!rcu_read_lock_held()); + WARN_ON_ONCE(!rcu_read_lock_any_held()); =20 return rq->idle_state; } --=20 2.34.1