cgroup: rename cgroup->dummy_css to ->self and move it to the top
cgroup->dummy_css is used as the placeholder css when performing css
oriended operations on the cgroup. We're gonna shift more cgroup
management to this css. Let's rename it to ->self and move it to the
top.
This is pure rename and field relocation.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index f36fd9c..b57a949 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -220,7 +220,7 @@
/**
* cgroup_css - obtain a cgroup's css for the specified subsystem
* @cgrp: the cgroup of interest
- * @ss: the subsystem of interest (%NULL returns the dummy_css)
+ * @ss: the subsystem of interest (%NULL returns @cgrp->self)
*
* Return @cgrp's css (cgroup_subsys_state) associated with @ss. This
* function must be called either under cgroup_mutex or rcu_read_lock() and
@@ -235,13 +235,13 @@
return rcu_dereference_check(cgrp->subsys[ss->id],
lockdep_is_held(&cgroup_mutex));
else
- return &cgrp->dummy_css;
+ return &cgrp->self;
}
/**
* cgroup_e_css - obtain a cgroup's effective css for the specified subsystem
* @cgrp: the cgroup of interest
- * @ss: the subsystem of interest (%NULL returns the dummy_css)
+ * @ss: the subsystem of interest (%NULL returns @cgrp->self)
*
* Similar to cgroup_css() but returns the effctive css, which is defined
* as the matching css of the nearest ancestor including self which has @ss
@@ -254,7 +254,7 @@
lockdep_assert_held(&cgroup_mutex);
if (!ss)
- return &cgrp->dummy_css;
+ return &cgrp->self;
if (!(cgrp->root->subsys_mask & (1 << ss->id)))
return NULL;
@@ -288,7 +288,7 @@
if (cft->ss)
return rcu_dereference_raw(cgrp->subsys[cft->ss->id]);
else
- return &cgrp->dummy_css;
+ return &cgrp->self;
}
EXPORT_SYMBOL_GPL(of_css);
@@ -1551,7 +1551,7 @@
INIT_LIST_HEAD(&cgrp->release_list);
INIT_LIST_HEAD(&cgrp->pidlists);
mutex_init(&cgrp->pidlist_mutex);
- cgrp->dummy_css.cgroup = cgrp;
+ cgrp->self.cgroup = cgrp;
for_each_subsys(ss, ssid)
INIT_LIST_HEAD(&cgrp->e_csets[ssid]);
@@ -3454,7 +3454,7 @@
* ->can_attach() fails.
*/
do {
- css_task_iter_start(&from->dummy_css, &it);
+ css_task_iter_start(&from->self, &it);
task = css_task_iter_next(&it);
if (task)
get_task_struct(task);
@@ -3719,7 +3719,7 @@
if (!array)
return -ENOMEM;
/* now, populate the array */
- css_task_iter_start(&cgrp->dummy_css, &it);
+ css_task_iter_start(&cgrp->self, &it);
while ((tsk = css_task_iter_next(&it))) {
if (unlikely(n == length))
break;
@@ -3793,7 +3793,7 @@
}
rcu_read_unlock();
- css_task_iter_start(&cgrp->dummy_css, &it);
+ css_task_iter_start(&cgrp->self, &it);
while ((tsk = css_task_iter_next(&it))) {
switch (tsk->state) {
case TASK_RUNNING:
@@ -4274,7 +4274,7 @@
init_cgroup_housekeeping(cgrp);
cgrp->parent = parent;
- cgrp->dummy_css.parent = &parent->dummy_css;
+ cgrp->self.parent = &parent->self;
cgrp->root = root;
if (notify_on_release(parent))
