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Subject[PATCH 2/5] mm: migration of hugetlbfs page skip memcg
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>
---
This fixes a likely future warning, but is just a cleanup right now.

mm/migrate.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- 5.9-rc2/mm/migrate.c 2020-08-16 17:32:50.665507048 -0700
+++ linux/mm/migrate.c 2020-08-28 17:42:07.967278385 -0700
@@ -668,7 +668,8 @@ void migrate_page_states(struct page *ne

copy_page_owner(page, newpage);

- mem_cgroup_migrate(page, newpage);
+ if (!PageHuge(page))
+ mem_cgroup_migrate(page, newpage);
}
EXPORT_SYMBOL(migrate_page_states);

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