sched/cpuacct: Initialize cpuacct subsystem earlier

Initialize cpuacct before the scheduler is functioning, so when
cpuacct_charge() and cpuacct_account_field() are called,
task_ca() won't return NULL.

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/5155383F.8000005@huawei.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 6 insertions, 5 deletions

diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
index 04255814a0ed..75e46d291f9c 100644
--- a/kernel/sched/cpuacct.c
+++ b/kernel/sched/cpuacct.c
@@ -292,9 +292,10 @@ void cpuacct_account_field(struct task_struct *p, int index, u64 val)
 }
 
 struct cgroup_subsys cpuacct_subsys = {
-        .name = "cpuacct",
-        .css_alloc = cpuacct_css_alloc,
-        .css_free = cpuacct_css_free,
-        .subsys_id = cpuacct_subsys_id,
-        .base_cftypes = files,
+        .name           = "cpuacct",
+        .css_alloc      = cpuacct_css_alloc,
+        .css_free       = cpuacct_css_free,
+        .subsys_id      = cpuacct_subsys_id,
+        .base_cftypes   = files,
+        .early_init     = 1,
 };