linux-kernel - [PATCH] sched: idle: Change the cpu_idle

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Message-Id: <20200827121225.2991-1-frank@allwinnertech.com>
Date:   Thu, 27 Aug 2020 20:12:25 +0800
From:   Frank Lee <frank@...winnertech.com>
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de
Cc:     linux-kernel@...r.kernel.org, tiny.windzz@...il.com,
        Yangtao Li <frank@...winnertech.com>
Subject: [PATCH] sched: idle: Change the cpu_idle_poll() return type to void

From: Yangtao Li <frank@...winnertech.com>

No one cares about the return value of this function, which only
increases the time spent in idle loop. Let's drop it.

Signed-off-by: Yangtao Li <frank@...winnertech.com>

---
 kernel/sched/idle.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 6bf34986f45c..5250a7c466e6 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -52,7 +52,7 @@ static int __init cpu_idle_nopoll_setup(char *__unused)
 __setup("hlt", cpu_idle_nopoll_setup);
 #endif
 
-static noinline int __cpuidle cpu_idle_poll(void)
+static noinline void __cpuidle cpu_idle_poll(void)
 {
 	rcu_idle_enter();
 	trace_cpu_idle_rcuidle(0, smp_processor_id());
@@ -65,8 +65,6 @@ static noinline int __cpuidle cpu_idle_poll(void)
 	start_critical_timings();
 	trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
 	rcu_idle_exit();
-
-	return 1;
 }
 
 /* Weak implementations for optional arch specific functions */
-- 
2.28.0