cgroup: s/cgroup_subsys_state/cgroup_css/ s/task_subsys_state/task_css/

The names of the two struct cgroup_subsys_state accessors -
cgroup_subsys_state() and task_subsys_state() - are somewhat awkward.
The former clashes with the type name and the latter doesn't even
indicate it's somehow related to cgroup.

We're about to revamp large portion of cgroup API, so, let's rename
them so that they're less awkward.  Most per-controller usages of the
accessors are localized in accessor wrappers and given the amount of
scheduled changes, this isn't gonna add any noticeable headache.

Rename cgroup_subsys_state() to cgroup_css() and task_subsys_state()
to task_css().  This patch is pure rename.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>

3 files changed, 7 insertions, 7 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 9b1f2e533b95..323d907eac1a 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6761,7 +6761,7 @@ void sched_move_task(struct task_struct *tsk)
         if (unlikely(running))
                 tsk->sched_class->put_prev_task(rq, tsk);
 
-        tg = container_of(task_subsys_state_check(tsk, cpu_cgroup_subsys_id,
+        tg = container_of(task_css_check(tsk, cpu_cgroup_subsys_id,
                                 lockdep_is_held(&tsk->sighand->siglock)),
                           struct task_group, css);
         tg = autogroup_task_group(tsk, tg);
@@ -7086,7 +7086,7 @@ int sched_rt_handler(struct ctl_table *table, int write,
 /* return corresponding task_group object of a cgroup */
 static inline struct task_group *cgroup_tg(struct cgroup *cgrp)
 {
-        return container_of(cgroup_subsys_state(cgrp, cpu_cgroup_subsys_id),
+        return container_of(cgroup_css(cgrp, cpu_cgroup_subsys_id),
                             struct task_group, css);
 }
 
diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
index dbb7e2cd95eb..4a210faaab77 100644
--- a/kernel/sched/cpuacct.c
+++ b/kernel/sched/cpuacct.c
@@ -36,14 +36,14 @@ struct cpuacct {
 /* return cpu accounting group corresponding to this container */
 static inline struct cpuacct *cgroup_ca(struct cgroup *cgrp)
 {
-        return container_of(cgroup_subsys_state(cgrp, cpuacct_subsys_id),
+        return container_of(cgroup_css(cgrp, cpuacct_subsys_id),
                             struct cpuacct, css);
 }
 
 /* return cpu accounting group to which this task belongs */
 static inline struct cpuacct *task_ca(struct task_struct *tsk)
 {
-        return container_of(task_subsys_state(tsk, cpuacct_subsys_id),
+        return container_of(task_css(tsk, cpuacct_subsys_id),
                             struct cpuacct, css);
 }
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index ef0a7b2439dd..471a56db05ea 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -665,9 +665,9 @@ extern int group_balance_cpu(struct sched_group *sg);
 /*
  * Return the group to which this tasks belongs.
  *
- * We cannot use task_subsys_state() and friends because the cgroup
- * subsystem changes that value before the cgroup_subsys::attach() method
- * is called, therefore we cannot pin it and might observe the wrong value.
+ * We cannot use task_css() and friends because the cgroup subsystem
+ * changes that value before the cgroup_subsys::attach() method is called,
+ * therefore we cannot pin it and might observe the wrong value.
  *
  * The same is true for autogroup's p->signal->autogroup->tg, the autogroup
  * core changes this before calling sched_move_task().