linux-kernel - [PATCH v3 5/8] sched/core: Check for rcu_read_lock_any_held() in idle_get

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20260120113246.27987-6-kprateek.nayak@amd.com>
Date: Tue, 20 Jan 2026 11:32:43 +0000
From: K Prateek Nayak <kprateek.nayak@....com>
To: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot
	<vincent.guittot@...aro.org>, <linux-kernel@...r.kernel.org>
CC: Dietmar Eggemann <dietmar.eggemann@....com>, Steven Rostedt
	<rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, Mel Gorman
	<mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>, Chen Yu
	<yu.c.chen@...el.com>, Shrikanth Hegde <sshegde@...ux.ibm.com>, "Gautham R.
 Shenoy" <gautham.shenoy@....com>, K Prateek Nayak <kprateek.nayak@....com>
Subject: [PATCH v3 5/8] sched/core: Check for rcu_read_lock_any_held() in idle_get_state()

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 <kprateek.nayak@....com>
---
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,
 
 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());
 
 	return rq->idle_state;
 }
-- 
2.34.1