linux-kernel - [PATCH v6.6 2/4] sched/fair: Small cleanup to sched_balance

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Message-Id: <20251203112255.1738272-3-ajay.kaher@broadcom.com>
Date: Wed,  3 Dec 2025 11:22:53 +0000
From: Ajay Kaher <ajay.kaher@...adcom.com>
To: stable@...r.kernel.org,
	gregkh@...uxfoundation.org
Cc: mingo@...hat.com,
	peterz@...radead.org,
	juri.lelli@...hat.com,
	vincent.guittot@...aro.org,
	dietmar.eggemann@....com,
	rostedt@...dmis.org,
	bsegall@...gle.com,
	mgorman@...e.de,
	vschneid@...hat.com,
	linux-kernel@...r.kernel.org,
	ajay.kaher@...adcom.com,
	alexey.makhalov@...adcom.com,
	yin.ding@...adcom.com,
	tapas.kundu@...adcom.com,
	Chris Mason <clm@...a.com>
Subject: [PATCH v6.6 2/4] sched/fair: Small cleanup to sched_balance_newidle()

From: Peter Zijlstra <peterz@...radead.org>

commit e78e70dbf603c1425f15f32b455ca148c932f6c1 upstream.

Pull out the !sd check to simplify code.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@....com>
Tested-by: Dietmar Eggemann <dietmar.eggemann@....com>
Tested-by: Chris Mason <clm@...a.com>
Link: https://patch.msgid.link/20251107161739.525916173@infradead.org
[ Ajay: Modified to apply on v6.6 ]
Signed-off-by: Ajay Kaher <ajay.kaher@...adcom.com>
---
 kernel/sched/fair.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 842d54a91..e47bf8d6c 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -12362,14 +12362,15 @@ static int sched_balance_newidle(struct rq *this_rq, struct rq_flags *rf)
 
 	rcu_read_lock();
 	sd = rcu_dereference_check_sched_domain(this_rq->sd);
+	if (!sd) {
+		rcu_read_unlock();
+		goto out;
+	}
 
 	if (!READ_ONCE(this_rq->rd->overload) ||
-	    (sd && this_rq->avg_idle < sd->max_newidle_lb_cost)) {
-
-		if (sd)
-			update_next_balance(sd, &next_balance);
+	    this_rq->avg_idle < sd->max_newidle_lb_cost) {
+		update_next_balance(sd, &next_balance);
 		rcu_read_unlock();
-
 		goto out;
 	}
 	rcu_read_unlock();
-- 
2.40.4