[PATCH] tick/sched : remove redundancy cpu_online check

[PATCH] tick/sched : remove redundancy cpu_online check

[Peng Hao]

From: Peng Hao <peng.hao2@zte.com.cn>

in can_stop_idle_tick cpu_online() was called earlier and if cpu
offline it will return. so it don't need to call cpu_online()
again.

Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
---
 kernel/time/tick-sched.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 5b33e2f..69e673b 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -885,7 +885,7 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
 	if (need_resched())
 		return false;
 
-	if (unlikely(local_softirq_pending() && cpu_online(cpu))) {
+	if (unlikely(local_softirq_pending())) {
 		static int ratelimit;
 
 		if (ratelimit < 10 &&
-- 
1.8.3.1

[tip:timers/core] tick/sched : Remove redundant cpu_online() check

[tip-bot for Peng Hao]

Commit-ID:  d59e0ba19481c0046d2ea2bd0e5344eeaf45aace
Gitweb:     https://git.kernel.org/tip/d59e0ba19481c0046d2ea2bd0e5344eeaf45aace
Author:     Peng Hao <peng.hao2@zte.com.cn>
AuthorDate: Tue, 9 Oct 2018 11:43:35 -0400
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Wed, 10 Oct 2018 11:47:20 +0200

tick/sched : Remove redundant cpu_online() check

can_stop_idle_tick() checks cpu_online() twice. The first check leaves the
function when the CPU is not online, so the second check it
redundant. Remove it.

Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: fweisbec@gmail.com
Link: https://lkml.kernel.org/r/1539099815-2943-1-git-send-email-penghao122@sina.com.cn
---
 kernel/time/tick-sched.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 5b33e2f5c0ed..69e673b88474 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -885,7 +885,7 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
 	if (need_resched())
 		return false;
 
-	if (unlikely(local_softirq_pending() && cpu_online(cpu))) {
+	if (unlikely(local_softirq_pending())) {
 		static int ratelimit;
 
 		if (ratelimit < 10 &&