linux-kernel - [PATCH 2/4] sched/core: Remove redundant 'preempt' param from sched_class->yield_to

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Message-Id: <20200603080304.16548-3-dietmar.eggemann@arm.com>
Date:   Wed,  3 Jun 2020 10:03:02 +0200
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] sched/core: Remove redundant 'preempt' param from sched_class->yield_to_task()

Commit 6d1cafd8b56e ("sched: Resched proper CPU on yield_to()") moved
the code to resched the CPU from yield_to_task_fair() to yield_to()
making the preempt parameter in sched_class->yield_to_task()
unnecessary. Remove it. No other sched_class implements yield_to_task().

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>
---
 kernel/sched/core.c  | 2 +-
 kernel/sched/fair.c  | 2 +-
 kernel/sched/sched.h | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 95e457d4ed1c..687b16047f92 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5812,7 +5812,7 @@ int __sched yield_to(struct task_struct *p, bool preempt)
 	if (task_running(p_rq, p) || p->state)
 		goto out_unlock;
 
-	yielded = curr->sched_class->yield_to_task(rq, p, preempt);
+	yielded = curr->sched_class->yield_to_task(rq, p);
 	if (yielded) {
 		schedstat_inc(rq->yld_count);
 		/*
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index dda9b194d225..5c4a559d0dae 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7158,7 +7158,7 @@ static void yield_task_fair(struct rq *rq)
 	set_skip_buddy(se);
 }
 
-static bool yield_to_task_fair(struct rq *rq, struct task_struct *p, bool preempt)
+static bool yield_to_task_fair(struct rq *rq, struct task_struct *p)
 {
 	struct sched_entity *se = &p->se;
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 4b32cff0dcbe..12a0d0c7c164 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1752,7 +1752,7 @@ struct sched_class {
 	void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
 	void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
 	void (*yield_task)   (struct rq *rq);
-	bool (*yield_to_task)(struct rq *rq, struct task_struct *p, bool preempt);
+	bool (*yield_to_task)(struct rq *rq, struct task_struct *p);
 
 	void (*check_preempt_curr)(struct rq *rq, struct task_struct *p, int flags);
 
-- 
2.17.1