Re: [BUGFIX][PATCH] memcg: fix thresholds with use_hierarchy == 1

[Daisuke Nishimura]

> I think you can simplify this part by using parent_mem_cgroup() like:
> 
> 	parent = parent_mem_cgroup(memcg);
> 	if (!memcg)
           ^^^^^^^^ must be !parent of course :)
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