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cgroup: move cgroup->sibling and ->children into cgroup_subsys_state

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We're moving towards using cgroup_subsys_states as the fundamental
structural blocks.  Let's move cgroup->sibling and ->children into
cgroup_subsys_state.  This is pure move without functional change and
only cgroup->self's fields are actually used.  Other csses will make
use of the fields later.

While at it, update init_and_link_css() so that it zeroes the whole
css before initializing it and remove explicit zeroing of ->flags.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo
2014-05-16 13:22:48 -04:00
parent d51f39b05c
commit d5c419b68e
2 changed files with 24 additions and 25 deletions
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11
include/linux/cgroup.h
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@@ -68,6 +68,10 @@ struct cgroup_subsys_state {
/* PI: the parent css */
struct cgroup_subsys_state *parent;
/* siblings list anchored at the parent's ->children */
struct list_head sibling;
struct list_head children;
/*
* PI: Subsys-unique ID. 0 is unused and root is always 1. The
* matching css can be looked up using css_from_id().
@@ -171,13 +175,6 @@ struct cgroup {
*/
int populated_cnt;
/*
* We link our 'sibling' struct into our parent's 'children'.
* Our children link their 'sibling' into our 'children'.
*/
struct list_head sibling; /* my parent's children */
struct list_head children; /* my children */
struct kernfs_node *kn; /* cgroup kernfs entry */
struct kernfs_node *populated_kn; /* kn for "cgroup.subtree_populated" */