linux-kernel - [PATCH v2 3/5] sched/fair: remove useless check in select_idle

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Message-Id: <20220901131107.71785-3-wuyun.abel@bytedance.com>
Date:   Thu,  1 Sep 2022 21:11:05 +0800
From:   Abel Wu <wuyun.abel@...edance.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Mel Gorman <mgorman@...e.de>,
        Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Josh Don <joshdon@...gle.com>, Chen Yu <yu.c.chen@...el.com>,
        Yicong Yang <yangyicong@...wei.com>,
        linux-kernel@...r.kernel.org, Abel Wu <wuyun.abel@...edance.com>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH v2 3/5] sched/fair: remove useless check in select_idle_core

The function only gets called when sds->has_idle_cores is true
which can be possible only when sched_smt_present is enabled.
This change also aligns select_idle_core with select_idle_smt
that the caller do the check if necessary.

Signed-off-by: Abel Wu <wuyun.abel@...edance.com>
Acked-by: Mel Gorman <mgorman@...hsingularity.net>
---
 kernel/sched/fair.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1ad79aaaaf93..03ce65068333 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6321,9 +6321,6 @@ static int select_idle_core(struct task_struct *p, int core, struct cpumask *cpu
 	bool idle = true;
 	int cpu;
 
-	if (!static_branch_likely(&sched_smt_present))
-		return __select_idle_cpu(core, p);
-
 	for_each_cpu(cpu, cpu_smt_mask(core)) {
 		if (!available_idle_cpu(cpu)) {
 			idle = false;
-- 
2.31.1