memcg: fold __mem_cgroup_move_account into caller
It is one logical function, no need to have it split up. Also, get rid of some checks from the inner function that ensured the sanity of the outer function. Signed-off-by: NJohannes Weiner <hannes@cmpxchg.org> Acked-by: NKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: NDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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