From: Johannes Weiner <hannes@cmpxchg.org>
Date: Thu, 12 Nov 2015 18:41:21 -0500

Letting shrink_slab() handle the root_mem_cgroup, and implicitely the
!CONFIG_MEMCG case, allows shrink_zone() to invoke the shrinkers
unconditionally from within the memcg iteration loop.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>

Acked-by: David S. Miller <davem@davemloft.net>

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