cgroup: convert cgroup_cft_commit() to use cgroup_for_each_descendant_pre()

We used root->allcg_list to iterate cgroup hierarchy because at that time
cgroup_for_each_descendant_pre() hasn't been invented.

tj: In cgroup_cfts_commit(), s/@serial_nr/@update_upto/, move the
    assignment right above releasing cgroup_mutex and explain what's
    going on there.

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

1 files changed, 0 insertions, 6 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index f97522790682..b28365890646 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -206,9 +206,6 @@ struct cgroup {
          */
         struct list_head cset_links;
 
-        struct list_head allcg_node;    /* cgroupfs_root->allcg_list */
-        struct list_head cft_q_node;    /* used during cftype add/rm */
-
         /*
          * Linked list running through all cgroups that can
          * potentially be reaped by the release agent. Protected by
@@ -313,9 +310,6 @@ struct cgroupfs_root {
         /* A list running through the active hierarchies */
         struct list_head root_list;
 
-        /* All cgroups on this root, cgroup_mutex protected */
-        struct list_head allcg_list;
-
         /* Hierarchy-specific flags */
         unsigned long flags;