cgroup: remove cgroup_subsys->populate()

With memcg converted, cgroup_subsys->populate() doesn't have any user
left.  Remove it.

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

1 files changed, 0 insertions, 3 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 2905977e0f33..b2f203f25ec8 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -3842,9 +3842,6 @@ static int cgroup_populate_dir(struct cgroup *cgrp)
         for_each_subsys(cgrp->root, ss) {
                 struct cftype_set *set;
 
-                if (ss->populate && (err = ss->populate(ss, cgrp)) < 0)
-                        return err;
-
                 list_for_each_entry(set, &ss->cftsets, node)
                         cgroup_addrm_files(cgrp, ss, set->cfts, true);
         }