linux-kernel - [tip: sched/core] sched: Match __task_rq

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Message-ID: <176060720600.709179.949762469775900348.tip-bot2@tip-bot2>
Date: Thu, 16 Oct 2025 09:33:26 -0000
From: "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>,
 Juri Lelli <juri.lelli@...hat.com>, Tejun Heo <tj@...nel.org>,
 Vincent Guittot <vincent.guittot@...aro.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched: Match __task_rq_{,un}lock()

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     5892cbd85dbf9059b8a3a7dd8ab64c0fce671029
Gitweb:        https://git.kernel.org/tip/5892cbd85dbf9059b8a3a7dd8ab64c0fce671029
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Thu, 25 Sep 2025 11:26:22 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Thu, 16 Oct 2025 11:13:54 +02:00

sched: Match __task_rq_{,un}lock()

In preparation to adding more rules to __task_rq_lock(), such that
__task_rq_unlock() will no longer be equivalent to rq_unlock(),
make sure every __task_rq_lock() is matched by a __task_rq_unlock()
and vice-versa.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Juri Lelli <juri.lelli@...hat.com>
Acked-by: Tejun Heo <tj@...nel.org>
Acked-by: Vincent Guittot <vincent.guittot@...aro.org>
---
 kernel/sched/core.c  | 13 ++++++++-----
 kernel/sched/sched.h |  8 ++++----
 kernel/sched/stats.h |  2 +-
 3 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 8c55740..e715147 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2582,7 +2582,8 @@ static int migration_cpu_stop(void *data)
 		 */
 		WARN_ON_ONCE(!pending->stop_pending);
 		preempt_disable();
-		task_rq_unlock(rq, p, &rf);
+		rq_unlock(rq, &rf);
+		raw_spin_unlock_irqrestore(&p->pi_lock, rf.flags);
 		stop_one_cpu_nowait(task_cpu(p), migration_cpu_stop,
 				    &pending->arg, &pending->stop_work);
 		preempt_enable();
@@ -2591,7 +2592,8 @@ static int migration_cpu_stop(void *data)
 out:
 	if (pending)
 		pending->stop_pending = false;
-	task_rq_unlock(rq, p, &rf);
+	rq_unlock(rq, &rf);
+	raw_spin_unlock_irqrestore(&p->pi_lock, rf.flags);
 
 	if (complete)
 		complete_all(&pending->done);
@@ -3708,7 +3710,7 @@ static int ttwu_runnable(struct task_struct *p, int wake_flags)
 		ttwu_do_wakeup(p);
 		ret = 1;
 	}
-	__task_rq_unlock(rq, &rf);
+	__task_rq_unlock(rq, p, &rf);
 
 	return ret;
 }
@@ -4301,7 +4303,7 @@ int task_call_func(struct task_struct *p, task_call_f func, void *arg)
 	ret = func(p, arg);
 
 	if (rq)
-		rq_unlock(rq, &rf);
+		__task_rq_unlock(rq, p, &rf);
 
 	raw_spin_unlock_irqrestore(&p->pi_lock, rf.flags);
 	return ret;
@@ -7362,7 +7364,8 @@ out_unlock:
 
 	rq_unpin_lock(rq, &rf);
 	__balance_callbacks(rq);
-	raw_spin_rq_unlock(rq);
+	rq_repin_lock(rq, &rf);
+	__task_rq_unlock(rq, p, &rf);
 
 	preempt_enable();
 }
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 3462145..e3d2710 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1825,7 +1825,8 @@ struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf)
 	__acquires(p->pi_lock)
 	__acquires(rq->lock);
 
-static inline void __task_rq_unlock(struct rq *rq, struct rq_flags *rf)
+static inline void
+__task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
 	__releases(rq->lock)
 {
 	rq_unpin_lock(rq, rf);
@@ -1837,8 +1838,7 @@ task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
 	__releases(rq->lock)
 	__releases(p->pi_lock)
 {
-	rq_unpin_lock(rq, rf);
-	raw_spin_rq_unlock(rq);
+	__task_rq_unlock(rq, p, rf);
 	raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags);
 }
 
@@ -1849,7 +1849,7 @@ DEFINE_LOCK_GUARD_1(task_rq_lock, struct task_struct,
 
 DEFINE_LOCK_GUARD_1(__task_rq_lock, struct task_struct,
 		    _T->rq = __task_rq_lock(_T->lock, &_T->rf),
-		    __task_rq_unlock(_T->rq, &_T->rf),
+		    __task_rq_unlock(_T->rq, _T->lock, &_T->rf),
 		    struct rq *rq; struct rq_flags rf)
 
 static inline void rq_lock_irqsave(struct rq *rq, struct rq_flags *rf)
diff --git a/kernel/sched/stats.h b/kernel/sched/stats.h
index 26f3fd4..cbf7206 100644
--- a/kernel/sched/stats.h
+++ b/kernel/sched/stats.h
@@ -206,7 +206,7 @@ static inline void psi_ttwu_dequeue(struct task_struct *p)
 
 		rq = __task_rq_lock(p, &rf);
 		psi_task_change(p, p->psi_flags, 0);
-		__task_rq_unlock(rq, &rf);
+		__task_rq_unlock(rq, p, &rf);
 	}
 }