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mm, swap: split the swap memcg charge helpers
From: Nhat Pham nphamcs@gmail.com Split __mem_cgroup_try_charge_swap() into separate get, charge, record, uncharge and put helpers, and factor mem_cgroup_may_zswap() out of obj_cgroup_may_zswap().
From: Nhat Pham nphamcs@gmail.com Split __mem_cgroup_try_charge_swap() into separate get, charge, record, uncharge and put helpers, and factor mem_cgroup_may_zswap() out of obj_cgroup_may_zswap().