The last man standing justifying the need for populate() is the
sock memcg initialization functions. Now that we are able to pass
a struct mem_cgroup instead of a struct cgroup to the socket
initialization, there is nothing that stops us from initializing
everything in create().
Signed-off-by: Glauber Costa <glommer@parallels.com> Acked-by: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org> CC: Li Zefan <lizefan@huawei.com> CC: Johannes Weiner <hannes@cmpxchg.org> CC: Michal Hocko <mhocko@suse.cz>