On Sun, Aug 30, 2020 at 02:01:30PM -0700, Hugh Dickins wrote:

hugetlbfs pages do not participate in memcg: so although they do find
most of migrate_page_states() useful, it would be better if they did
not call into mem_cgroup_migrate() - where Qian Cai reported that LTP's
move_pages12 triggers the warning in Alex Shi's prospective commit
"mm/memcg: warning on !memcg after readahead page charged".

Signed-off-by: Hugh Dickins <hughd@google.com>

Acked-by: Johannes Weiner <redacted>