It's not used, and it can be retrieved via cgrp->root->top_cgroup.
Signed-off-by: Li Zefan <lize...@huawei.com>
---
include/linux/cgroup.h | 1 -
kernel/cgroup.c | 2 --
2 files changed, 3 deletions(-)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 9c300ad..64047ae 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -204,7 +204,6 @@ struct cgroup {
struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
struct cgroupfs_root *root;
- struct cgroup *top_cgroup;
/*
* List of cg_cgroup_links pointing at css_sets with
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 6780459..c16719e 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);
--
1.8.0.2
--
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