linux-kernel - [tip: sched/urgent] sched/hrtick: Fix hrtick() vs. scheduling context

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Message-ID: <176478631093.498.14674730101010917528.tip-bot2@tip-bot2>
Date: Wed, 03 Dec 2025 18:25:10 -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>,
 Ingo Molnar <mingo@...nel.org>, John Stultz <jstultz@...gle.com>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: sched/urgent] sched/hrtick: Fix hrtick() vs. scheduling context

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

Commit-ID:     8720ba2d028f1aff08a55d8fe1a124dd5a6cfb0a
Gitweb:        https://git.kernel.org/tip/8720ba2d028f1aff08a55d8fe1a124dd5a6cfb0a
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Mon, 01 Sep 2025 22:46:29 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 02 Dec 2025 15:37:52 +01:00

sched/hrtick: Fix hrtick() vs. scheduling context

The sched_class::task_tick() method is called on the donor
sched_class, and sched_tick() hands it rq->donor as argument,
which is consistent.

However, while hrtick() uses the donor sched_class, it then passes
rq->curr, which is inconsistent. Fix it.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Acked-by: John Stultz <jstultz@...gle.com>
Link: https://patch.msgid.link/20250918080205.442967033@infradead.org
---
 kernel/sched/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 7dfb6a9..be55f95 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -878,7 +878,7 @@ static enum hrtimer_restart hrtick(struct hrtimer *timer)

 	rq_lock(rq, &rf);
 	update_rq_clock(rq);
-	rq->donor->sched_class->task_tick(rq, rq->curr, 1);
+	rq->donor->sched_class->task_tick(rq, rq->donor, 1);
 	rq_unlock(rq, &rf);

 	return HRTIMER_NORESTART;