sched/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@huawei.com>
Cc: Tejun Heo <tj@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/51553834.9090701@huawei.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

3 files changed, 4 insertions, 14 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 92930a89529d..ee8c1bd703fe 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6936,8 +6936,6 @@ 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 a691c4dd65be..04255814a0ed 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 51cd76eb4f0f..ed605624a5e7 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)
 {
 }