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mm: add page_counter_margin()
[mm: add page_counter_margin()] From: Johannes Weiner hannes@cmpxchg.org mem_cgroup_get_nr_swap_pages() open-codes the remaining capacity across the memcg swap counter hierarchy. Add page_counter_
[mm: add page_counter_margin()] From: Johannes Weiner hannes@cmpxchg.org mem_cgroup_get_nr_swap_pages() open-codes the remaining capacity across the memcg swap counter hierarchy. Add page_counter_