mm: memcg: move pc lookup point to commit_charge()
None of the callsites actually need the page_cgroup descriptor themselves, so just pass the page and do the look up in there. We already had two bugs (6568d4a9 'mm: memcg: update the correct soft limit tree during migration' and 'memcg: fix Bad page state after replace_page_cache') where the passed page and pc were not referring to the same page frame. Signed-off-by: NJohannes Weiner <hannes@cmpxchg.org> Acked-by: NHugh Dickins <hughd@google.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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