mm: memcontrol: privatize memcg_page_state query functions
There are no users outside of the memory controller itself. The rest of the kernel cares either about node or lruvec stats. Link: https://lkml.kernel.org/r/20210209163304.77088-4-hannes@cmpxchg.orgSigned-off-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Shakeel Butt <shakeelb@google.com> Reviewed-by: Roman Gushchin <guro@fb.com> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Michal Koutný <mkoutny@suse.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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