---

yaml
---
r: 277391
b: refs/heads/master
c: 44252e4
h: refs/heads/master
i:
  277389: ed5ee9f
  277387: d8c3892
  277383: 8b680d3
  277375: b37a1d9
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3292beb340c76884427faa1f5d6085719477d889
+refs/heads/master: 44252e421ad81e711c5a9db158fad7f433f70665

trunk/kernel/sched/core.c

@@ -7849,7 +7849,6 @@ struct cpuacct {
 	/* cpuusage holds pointer to a u64-type object on every cpu */
 	u64 __percpu *cpuusage;
 	struct percpu_counter cpustat[CPUACCT_STAT_NSTATS];
-	struct cpuacct *parent;
 };
 
 struct cgroup_subsys cpuacct_subsys;
@@ -7868,6 +7867,13 @@ static inline struct cpuacct *task_ca(struct task_struct *tsk)
 			    struct cpuacct, css);
 }
 
+static inline struct cpuacct *parent_ca(struct cpuacct *ca)
+{
+	if (!ca || !ca->css.cgroup->parent)
+		return NULL;
+	return cgroup_ca(ca->css.cgroup->parent);
+}
+
 /* create a new cpu accounting group */
 static struct cgroup_subsys_state *cpuacct_create(
 	struct cgroup_subsys *ss, struct cgroup *cgrp)
@@ -7886,9 +7892,6 @@ static struct cgroup_subsys_state *cpuacct_create(
 		if (percpu_counter_init(&ca->cpustat[i], 0))
 			goto out_free_counters;
 
-	if (cgrp->parent)
-		ca->parent = cgroup_ca(cgrp->parent);
-
 	return &ca->css;
 
 out_free_counters:
@@ -8055,7 +8058,7 @@ void cpuacct_charge(struct task_struct *tsk, u64 cputime)
 
 	ca = task_ca(tsk);
 
-	for (; ca; ca = ca->parent) {
+	for (; ca; ca = parent_ca(ca)) {
 		u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
 		*cpuusage += cputime;
 	}
@@ -8097,7 +8100,7 @@ void cpuacct_update_stats(struct task_struct *tsk,
 
 	do {
 		__percpu_counter_add(&ca->cpustat[idx], val, batch);
-		ca = ca->parent;
+		ca = parent_ca(ca);
 	} while (ca);
 	rcu_read_unlock();
 }