mm: memcontrol: remove synchronous stock draining code
With charge reparenting, the last synchronous stock drainer left. Signed-off-by: NJohannes Weiner <hannes@cmpxchg.org> Reviewed-by: NVladimir Davydov <vdavydov@parallels.com> Acked-by: NMichal Hocko <mhocko@suse.cz> Cc: David Rientjes <rientjes@google.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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