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The mount directory for the selftests cgroup tree might not exist so let's make sure it does exist by creating it ourselves if it doesn't exist. Signed-off-by: Daan De Meyer <daan.j.demeyer@gmail.com> Link: https://lore.kernel.org/r/20231011185113.140426-9-daan.j.demeyer@gmail.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>