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>

7 files changed, 16 insertions, 16 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index ae4c468..0b3caa3 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -81,7 +81,7 @@
  */
 #ifdef CONFIG_PROVE_RCU
 DEFINE_MUTEX(cgroup_mutex);
-EXPORT_SYMBOL_GPL(cgroup_mutex);	/* only for task_subsys_state_check() */
+EXPORT_SYMBOL_GPL(cgroup_mutex);	/* only for lockdep */
 #else
 static DEFINE_MUTEX(cgroup_mutex);
 #endif
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index 75dda1e..9d3f615 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -47,13 +47,13 @@ struct freezer {
 
 static inline struct freezer *cgroup_freezer(struct cgroup *cgroup)
 {
-	return container_of(cgroup_subsys_state(cgroup, freezer_subsys_id),
+	return container_of(cgroup_css(cgroup, freezer_subsys_id),
 			    struct freezer, css);
 }
 
 static inline struct freezer *task_freezer(struct task_struct *task)
 {
-	return container_of(task_subsys_state(task, freezer_subsys_id),
+	return container_of(task_css(task, freezer_subsys_id),
 			    struct freezer, css);
 }
 
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 1b9c315..be4512b 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -117,14 +117,14 @@ struct cpuset {
 /* Retrieve the cpuset for a cgroup */
 static inline struct cpuset *cgroup_cs(struct cgroup *cgrp)
 {
-	return container_of(cgroup_subsys_state(cgrp, cpuset_subsys_id),
+	return container_of(cgroup_css(cgrp, cpuset_subsys_id),
 			    struct cpuset, css);
 }
 
 /* Retrieve the cpuset for a task */
 static inline struct cpuset *task_cs(struct task_struct *task)
 {
-	return container_of(task_subsys_state(task, cpuset_subsys_id),
+	return container_of(task_css(task, cpuset_subsys_id),
 			    struct cpuset, css);
 }
 
@@ -2724,7 +2724,7 @@ int proc_cpuset_show(struct seq_file *m, void *unused_v)
 		goto out_free;
 
 	rcu_read_lock();
-	css = task_subsys_state(tsk, cpuset_subsys_id);
+	css = task_css(tsk, cpuset_subsys_id);
 	retval = cgroup_path(css->cgroup, buf, PAGE_SIZE);
 	rcu_read_unlock();
 	if (retval < 0)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 1833bc5..414c61f 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -340,8 +340,8 @@ struct perf_cgroup {
 static inline struct perf_cgroup *
 perf_cgroup_from_task(struct task_struct *task)
 {
-	return container_of(task_subsys_state(task, perf_subsys_id),
-			struct perf_cgroup, css);
+	return container_of(task_css(task, perf_subsys_id),
+			    struct perf_cgroup, css);
 }
 
 static inline bool
@@ -7798,7 +7798,7 @@ static struct cgroup_subsys_state *perf_cgroup_css_alloc(struct cgroup *cont)
 static void perf_cgroup_css_free(struct cgroup *cont)
 {
 	struct perf_cgroup *jc;
-	jc = container_of(cgroup_subsys_state(cont, perf_subsys_id),
+	jc = container_of(cgroup_css(cont, perf_subsys_id),
 			  struct perf_cgroup, css);
 	free_percpu(jc->info);
 	kfree(jc);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 9b1f2e5..323d907 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 dbb7e2c..4a210fa 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 ef0a7b2..471a56d 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().