cgroup: merge cft_release_agent cftype array into the base files array

Now that cftype can express whether a file should only be on root,
cft_release_agent can be merged into the base files cftypes array.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizf@cn.fujitsu.com>

1 files changed, 7 insertions, 12 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index df8fb82ef350..66c1e3b5c0f2 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -3732,13 +3732,13 @@ static struct cftype files[] = {
                 .read_u64 = cgroup_clone_children_read,
                 .write_u64 = cgroup_clone_children_write,
         },
-};
-
-static struct cftype cft_release_agent = {
-        .name = "release_agent",
-        .read_seq_string = cgroup_release_agent_show,
-        .write_string = cgroup_release_agent_write,
-        .max_write_len = PATH_MAX,
+        {
+                .name = "release_agent",
+                .flags = CFTYPE_ONLY_ON_ROOT,
+                .read_seq_string = cgroup_release_agent_show,
+                .write_string = cgroup_release_agent_write,
+                .max_write_len = PATH_MAX,
+        },
 };
 
 static int cgroup_populate_dir(struct cgroup *cgrp)
@@ -3750,11 +3750,6 @@ static int cgroup_populate_dir(struct cgroup *cgrp)
         if (err < 0)
                 return err;
 
-        if (cgrp == cgrp->top_cgroup) {
-                if ((err = cgroup_add_file(cgrp, NULL, &cft_release_agent)) < 0)
-                        return err;
-        }
-
         /* process cftsets of each subsystem */
         for_each_subsys(cgrp->root, ss) {
                 struct cftype_set *set;