linux-kernel - [RFC PATCH 7/8] cpufreq: Remove SCHED_CPUFREQ

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Message-Id: <20240905092645.2885200-8-christian.loehle@arm.com>
Date: Thu,  5 Sep 2024 10:26:44 +0100
From: Christian Loehle <christian.loehle@....com>
To: linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	rafael@...nel.org,
	peterz@...radead.org
Cc: juri.lelli@...hat.com,
	mingo@...hat.com,
	dietmar.eggemann@....com,
	vschneid@...hat.com,
	vincent.guittot@...aro.org,
	Johannes.Thumshirn@....com,
	adrian.hunter@...el.com,
	ulf.hansson@...aro.org,
	bvanassche@....org,
	andres@...razel.de,
	asml.silence@...il.com,
	linux-block@...r.kernel.org,
	io-uring@...r.kernel.org,
	qyousef@...alina.io,
	dsmythies@...us.net,
	axboe@...nel.dk,
	Christian Loehle <christian.loehle@....com>
Subject: [RFC PATCH 7/8] cpufreq: Remove SCHED_CPUFREQ_IOWAIT update

Neither intel_pstate nor schedutil care for the flag anymore, so
remove the update and flag definition.

Signed-off-by: Christian Loehle <christian.loehle@....com>
---
 include/linux/sched/cpufreq.h | 2 --
 kernel/sched/fair.c           | 8 --------
 2 files changed, 10 deletions(-)

diff --git a/include/linux/sched/cpufreq.h b/include/linux/sched/cpufreq.h
index bdd31ab93bc5..d4af813d3126 100644
--- a/include/linux/sched/cpufreq.h
+++ b/include/linux/sched/cpufreq.h
@@ -8,8 +8,6 @@
  * Interface between cpufreq drivers and the scheduler:
  */
 
-#define SCHED_CPUFREQ_IOWAIT	(1U << 0)
-
 #ifdef CONFIG_CPU_FREQ
 struct cpufreq_policy;
 
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 9057584ec06d..5cae0e5619aa 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6759,14 +6759,6 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 	 */
 	util_est_enqueue(&rq->cfs, p);
 
-	/*
-	 * If in_iowait is set, the code below may not trigger any cpufreq
-	 * utilization updates, so do it here explicitly with the IOWAIT flag
-	 * passed.
-	 */
-	if (p->in_iowait)
-		cpufreq_update_util(rq, SCHED_CPUFREQ_IOWAIT);
-
 	for_each_sched_entity(se) {
 		if (se->on_rq)
 			break;
-- 
2.34.1