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Shenoy" , K Prateek Nayak Subject: [PATCH v4 6/9] sched/core: Check for rcu_read_lock_any_held() in idle_get_state() Date: Thu, 12 Mar 2026 04:44:31 +0000 Message-ID: <20260312044434.1974-7-kprateek.nayak@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260312044434.1974-1-kprateek.nayak@amd.com> References: <20260312044434.1974-1-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: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000C6184:EE_|CY3PR12MB9655:EE_ X-MS-Office365-Filtering-Correlation-Id: ea0e7d97-abb0-4c34-e2b4-08de7ff2592f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700016|1800799024|376014|7416014|56012099003|22082099003|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)(82310400026)(36860700016)(1800799024)(376014)(7416014)(56012099003)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: p2uXHZ1k4NJj/E91qCXgm7VqLsCltjKO95e5L9NCnQ0/GVH5fXi1+AhFjMVOhTQePn8o5cg0OemVIWP0kW+foJzXJ4R3emnhdzDSgFeoSFC5M/AaQPxwKIe+AqUvAly+GoZaeFkK6Ekuf+t0PyqMeo3F37a+xQ0LNviylE6Fa/gJh0wokR/PbXlqCKu34YkTFOw4Dy6oUIHmdqt75oWw66JCsNjlVwAlX2sh3BIjHW29t6qWGsIDT9qBn69KMFy9UDPVtupjUZ7CXzh2BTmf4SF8L+UX51deehKzbw1wWUu5tm7kPm/6TJfFrsaEuQ7Bu1uSJYFyVgnKgwYFaDcb7arv1BUINM9LhXS89My0jI2HGht5H7WGPTEvdGoQqw2cjIM4RP3ldnaPczxgJQdR7VbZsShj7ZPnvqp1AJJfkc32Huo5xlAYGHD14PpdKvkE X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Mar 2026 04:46:38.7507 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ea0e7d97-abb0-4c34-e2b4-08de7ff2592f 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: MWH0EPF000C6184.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY3PR12MB9655 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 v3..v4: o No changes. --- 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 953d89d71804..c4fc7726f82a 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2853,7 +2853,7 @@ 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