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Pull percpu changes from Tejun Heo: "Nothing too interesting. One cleanup patch and another to add a trivial state check function" * 'for-3.20' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: percpu_ref: implement percpu_ref_is_dying() percpu_ref: remove unnecessary ACCESS_ONCE() in percpu_ref_tryget_live()