On Fri, Feb 05, 2021 at 12:30:55AM +0800, Muchun Song wrote:

The rule of list walk has gone since:

 commit a9d5adeeb4b2 ("mm/memcontrol: allow to uncharge page without using page->lru field")

So remove the strange comment and replace the loop with a
list_for_each_entry().

There is only one caller of the uncharge_list(). So just fold it into
mem_cgroup_uncharge_list() and remove it.

Signed-off-by: Muchun Song <redacted>

Acked-by: Johannes Weiner <redacted>

Thank you, Muchun!