linux-kernel - [PATCH v2] delayacct: optimize delayacct init

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20210915063040.159018-1-yang.yang29@zte.com.cn>
Date:   Wed, 15 Sep 2021 06:30:41 +0000
From:   cgel.zte@...il.com
To:     bsingharora@...il.com
Cc:     linux-kernel@...r.kernel.org, Yang Yang <yang.yang29@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH v2] 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>
Tested-by: Zeal Robot <zealci@....com.cn>
---
v2: move set_delayacct() in CONFIG_PROC_SYSCTL now 
---
 kernel/delayacct.c | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index 51530d5b15a8..1135a551edd1 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -18,17 +18,6 @@ DEFINE_STATIC_KEY_FALSE(delayacct_key);
 int delayacct_on __read_mostly;	/* Delay accounting turned on/off */
 struct kmem_cache *delayacct_cache;
 
-static void set_delayacct(bool enabled)
-{
-	if (enabled) {
-		static_branch_enable(&delayacct_key);
-		delayacct_on = 1;
-	} else {
-		delayacct_on = 0;
-		static_branch_disable(&delayacct_key);
-	}
-}
-
 static int __init delayacct_setup_enable(char *str)
 {
 	delayacct_on = 1;
@@ -39,11 +28,26 @@ __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
+static void set_delayacct(bool enabled)
+{
+	if (enabled) {
+		static_branch_enable(&delayacct_key);
+		delayacct_on = 1;
+	} else {
+		delayacct_on = 0;
+		static_branch_disable(&delayacct_key);
+	}
+}
+
 int sysctl_delayacct(struct ctl_table *table, int write, void *buffer,
 		     size_t *lenp, loff_t *ppos)
 {
-- 
2.25.1