cgroup: remove cgrp->top_cgroup

It's not used, and it can be retrieved via cgrp->root->top_cgroup.

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

1 files changed, 0 insertions, 2 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 67804590d4b0..c16719e056ab 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1418,7 +1418,6 @@ static void init_cgroup_root(struct cgroupfs_root *root)
         root->number_of_cgroups = 1;
         cgrp->root = root;
         cgrp->name = &root_cgroup_name;
-        cgrp->top_cgroup = cgrp;
         init_cgroup_housekeeping(cgrp);
         list_add_tail(&cgrp->allcg_node, &root->allcg_list);
 }
@@ -4145,7 +4144,6 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
 
         cgrp->parent = parent;
         cgrp->root = parent->root;
-        cgrp->top_cgroup = parent->top_cgroup;
 
         if (notify_on_release(parent))
                 set_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);