linux-kernel - [PATCH v3 3/7] sched: Extract __schedule

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Message-Id: <20230908162254.999499-4-bigeasy@linutronix.de>
Date:   Fri,  8 Sep 2023 18:22:50 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org
Cc:     bigeasy@...utronix.de, tglx@...utronix.de, boqun.feng@...il.com,
        bristot@...hat.com, bsegall@...gle.com, dietmar.eggemann@....com,
        jstultz@...gle.com, juri.lelli@...hat.com, longman@...hat.com,
        mgorman@...e.de, mingo@...hat.com, rostedt@...dmis.org,
        swood@...hat.com, vincent.guittot@...aro.org, vschneid@...hat.com,
        will@...nel.org
Subject: [PATCH v3 3/7] sched: Extract __schedule_loop()

From: Thomas Gleixner <tglx@...utronix.de>

There are currently two implementations of this basic __schedule()
loop, and there is soon to be a third.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: "Peter Zijlstra (Intel)" <peterz@...radead.org>
Link: https://lkml.kernel.org/r/20230427111937.2745231-2-bigeasy@linutronix.de
Link: https://lore.kernel.org/r/20230815111430.288063671@infradead.org
Link: https://lore.kernel.org/r/20230825181033.504534-4-bigeasy@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 kernel/sched/core.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index d55564097bd86..1ea7ba53aad24 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6770,16 +6770,21 @@ static void sched_update_worker(struct task_struct *tsk)
 	}
 }
 
+static __always_inline void __schedule_loop(unsigned int sched_mode)
+{
+	do {
+		preempt_disable();
+		__schedule(sched_mode);
+		sched_preempt_enable_no_resched();
+	} while (need_resched());
+}
+
 asmlinkage __visible void __sched schedule(void)
 {
 	struct task_struct *tsk = current;
 
 	sched_submit_work(tsk);
-	do {
-		preempt_disable();
-		__schedule(SM_NONE);
-		sched_preempt_enable_no_resched();
-	} while (need_resched());
+	__schedule_loop(SM_NONE);
 	sched_update_worker(tsk);
 }
 EXPORT_SYMBOL(schedule);
@@ -6843,11 +6848,7 @@ void __sched schedule_preempt_disabled(void)
 #ifdef CONFIG_PREEMPT_RT
 void __sched notrace schedule_rtlock(void)
 {
-	do {
-		preempt_disable();
-		__schedule(SM_RTLOCK_WAIT);
-		sched_preempt_enable_no_resched();
-	} while (need_resched());
+	__schedule_loop(SM_RTLOCK_WAIT);
 }
 NOKPROBE_SYMBOL(schedule_rtlock);
 #endif
-- 
2.40.1