linux-kernel - [PATCH 2/5] cpuacct: Initialize root cpuacct earlier

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Message-ID: <5153EF5A.3060402@huawei.com>
Date:	Thu, 28 Mar 2013 15:20:58 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Ingo Molnar <mingo@...nel.org>, Tejun Heo <tj@...nel.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>
Subject: [PATCH 2/5] cpuacct: Initialize root cpuacct earlier

Now we don't need cpuacct_init(), and instead we just initialize
root_cpuacct when it's defined.

Signed-off-by: Li Zefan <lizefan@...wei.com>
---
 kernel/sched/core.c    |  2 --
 kernel/sched/cpuacct.c | 11 ++++-------
 kernel/sched/cpuacct.h |  5 -----
 3 files changed, 4 insertions(+), 14 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 9f5a804..e12649c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6860,8 +6860,6 @@ void __init sched_init(void)
 
 #endif /* CONFIG_CGROUP_SCHED */
 
-	cpuacct_init();
-
 	for_each_possible_cpu(i) {
 		struct rq *rq;
 
diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
index a691c4d..0425581 100644
--- a/kernel/sched/cpuacct.c
+++ b/kernel/sched/cpuacct.c
@@ -59,7 +59,10 @@ static inline struct cpuacct *parent_ca(struct cpuacct *ca)
 }
 
 static DEFINE_PER_CPU(u64, root_cpuacct_cpuusage);
-static struct cpuacct root_cpuacct;
+static struct cpuacct root_cpuacct = {
+	.cpustat	= &kernel_cpustat,
+	.cpuusage	= &root_cpuacct_cpuusage,
+};
 
 /* create a new cpu accounting group */
 static struct cgroup_subsys_state *cpuacct_css_alloc(struct cgroup *cgrp)
@@ -288,12 +291,6 @@ void cpuacct_account_field(struct task_struct *p, int index, u64 val)
 	rcu_read_unlock();
 }
 
-void __init cpuacct_init(void)
-{
-	root_cpuacct.cpustat = &kernel_cpustat;
-	root_cpuacct.cpuusage = &root_cpuacct_cpuusage;
-}
-
 struct cgroup_subsys cpuacct_subsys = {
 	.name = "cpuacct",
 	.css_alloc = cpuacct_css_alloc,
diff --git a/kernel/sched/cpuacct.h b/kernel/sched/cpuacct.h
index 51cd76e..ed60562 100644
--- a/kernel/sched/cpuacct.h
+++ b/kernel/sched/cpuacct.h
@@ -1,15 +1,10 @@
 #ifdef CONFIG_CGROUP_CPUACCT
 
-extern void cpuacct_init(void);
 extern void cpuacct_charge(struct task_struct *tsk, u64 cputime);
 extern void cpuacct_account_field(struct task_struct *p, int index, u64 val);
 
 #else
 
-static inline void cpuacct_init(void)
-{
-}
-
 static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime)
 {
 }
-- 
1.8.0.2
--
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