Merge remote-tracking branch 'cgroup/for-next'

diff --cc Documentation/cgroups/unified-hierarchy.txt
Simple merge

diff --cc block/blk-cgroup.c
Simple merge

diff --cc include/linux/backing-dev.h
Simple merge

diff --cc include/linux/init_task.h
Simple merge

diff --cc include/linux/jump_label.h
Simple merge

diff --cc include/linux/memcontrol.h
Simple merge

diff --cc include/linux/sched.h
Simple merge

diff --cc kernel/events/core.c
Simple merge

diff --cc kernel/fork.c
Simple merge

diff --cc kernel/sched/core.c
Simple merge

diff --cc mm/memcontrol.c
Simple merge

diff --cc mm/vmscan.c
index 7f63a9381f71ebbb0c1f9bdda94a913c930280f0,2d978b28a410b25df1acde351630dee387efbbe5..e7057af54b6e267558a99749fac80dc77dd7855f
--- 1/mm/vmscan.c
--- 2/mm/vmscan.c
+++ b/mm/vmscan.c
@@@ -175,7 -175,7 +175,7 @@@ static bool sane_reclaim(struct scan_co
        if (!memcg)
                return true;
  #ifdef CONFIG_CGROUP_WRITEBACK
-       if (cgroup_on_dfl(memcg->css.cgroup))
 -      if (memcg->css.cgroup)
++      if (cgroup_subsys_on_dfl(memory_cgrp_subsys))
                return true;
  #endif
        return false;