linux-kernel - [PATCH 3/6] sched: Extract __schedule

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Message-ID: <20230815111430.288063671@infradead.org>
Date:   Tue, 15 Aug 2023 13:01:24 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     bigeasy@...utronix.de, tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        bsegall@...gle.com, boqun.feng@...il.com, swood@...hat.com,
        bristot@...hat.com, dietmar.eggemann@....com, mingo@...hat.com,
        jstultz@...gle.com, juri.lelli@...hat.com, mgorman@...e.de,
        rostedt@...dmis.org, vschneid@...hat.com,
        vincent.guittot@...aro.org, longman@...hat.com, will@...nel.org
Subject: [PATCH 3/6] 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
---
 kernel/sched/core.c |   21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6787,16 +6787,21 @@ static void sched_update_worker(struct t
 	}
 }
 
-asmlinkage __visible void __sched schedule(void)
+static __always_inline void __schedule_loop(unsigned int sched_mode)
 {
-	struct task_struct *tsk = current;
-
-	sched_submit_work(tsk);
 	do {
 		preempt_disable();
-		__schedule(SM_NONE);
+		__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);
+	__schedule_loop(SM_NONE);
 	sched_update_worker(tsk);
 }
 EXPORT_SYMBOL(schedule);
@@ -6860,11 +6865,7 @@ void __sched schedule_preempt_disabled(v
 #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