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test_hugetlb_memcg creates a child cgroup and then writes memory.max and memory.swap.max. When the test is run standalone, the memory controller may not be enabled in the test root cgroup's subtree_control. In that case, the child cgroup is created without the memory control files, and the test fails during setup before reaching the hugetlb memcg accounting checks. Skip the test when the memory controller is unavailable. Otherwise, enable it in subtree_control before creating the test cgroup. Signed-off-by: Guopeng Zhang <zhangguopeng@kylinos.cn> Acked-by: Michal Koutný <mkoutny@suse.com> Signed-off-by: Tejun Heo <tj@kernel.org>