linux-kernel - [PATCH] delayacct: optimize delayacct init

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Date:   Sat, 11 Sep 2021 07:41:21 +0000
From:   cgel.zte@...il.com
To:     bsingharora@...il.com, peterz@...radead.org
Cc:     linux-kernel@...r.kernel.org, Yang Yang <yang.yang29@....com.cn>
Subject: [PATCH] delayacct: optimize delayacct init

From: Yang Yang <yang.yang29@....com.cn>

In delayacct_init(), first there is no need to assign delayacct_on to
delayacct_on in set_delayacct(). Second if delayacct_on is 0, there
is no need call delayacct_tsk_init().

Signed-off-by: Yang Yang <yang.yang29@....com.cn>
---
 kernel/delayacct.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index 51530d5b15a8..cbf80273be6d 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -39,8 +39,13 @@ __setup("delayacct", delayacct_setup_enable);
 void delayacct_init(void)
 {
 	delayacct_cache = KMEM_CACHE(task_delay_info, SLAB_PANIC|SLAB_ACCOUNT);
+
+	if (delayacct_on)
+		static_branch_enable(&delayacct_key);
+	else
+		return;
+
 	delayacct_tsk_init(&init_task);
-	set_delayacct(delayacct_on);
 }
 
 #ifdef CONFIG_PROC_SYSCTL
-- 
2.25.1