mm: memcg: add folio_memcg_check()

mm: memcg: add folio_memcg_check()

Patch series "mm: convert page_idle/damon to use folios", v4.

This patch (of 8):

Convert page_memcg_check() into folio_memcg_check() and add a
page_memcg_check() wrapper.  The behaviour of page_memcg_check() is
unchanged; tail pages always had a NULL ->memcg_data.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Signed-off-by: Kefeng Wang <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: SeongJae Park <[email protected]>
Cc: Vishal Moola (Oracle) <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>