[PATCH cgroup/for-5.5] cgroup: fix incorrect WARN_ON_ONCE() in cgroup_setup_root()

From: Tejun Heo
Date: Thu Nov 14 2019 - 17:54:13 EST

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Never mind. I just failed to see the warning on x86_32. The warning
is spurious and fixed with the following commit. Applied to
cgroup/for-5.5.

Thanks.

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