cgroup: convert all non-memcg controllers to the new cftype interface

Convert debug, freezer, cpuset, cpu_cgroup, cpuacct, net_prio, blkio,
net_cls and device controllers to use the new cftype based interface.
Termination entry is added to cftype arrays and populate callbacks are
replaced with cgroup_subsys->base_cftypes initializations.

This is functionally identical transformation.  There shouldn't be any
visible behavior change.

memcg is rather special and will be converted separately.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Paul Menage <paul@paulmenage.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Vivek Goyal <vgoyal@redhat.com>

1 files changed, 3 insertions, 8 deletions

diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index f86e93920b62..3649fc6b3eaa 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -358,24 +358,19 @@ static int freezer_write(struct cgroup *cgroup,
 static struct cftype files[] = {
         {
                 .name = "state",
+                .flags = CFTYPE_NOT_ON_ROOT,
                 .read_seq_string = freezer_read,
                 .write_string = freezer_write,
         },
+        { }     /* terminate */
 };
 
-static int freezer_populate(struct cgroup_subsys *ss, struct cgroup *cgroup)
-{
-        if (!cgroup->parent)
-                return 0;
-        return cgroup_add_files(cgroup, ss, files, ARRAY_SIZE(files));
-}
-
 struct cgroup_subsys freezer_subsys = {
         .name           = "freezer",
         .create         = freezer_create,
         .destroy        = freezer_destroy,
-        .populate       = freezer_populate,
         .subsys_id      = freezer_subsys_id,
         .can_attach     = freezer_can_attach,
         .fork           = freezer_fork,
+        .base_cftypes   = files,
 };