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8291471ea5
css_alloc() needs the parent css, while cgroup_css() gets current cgropu's css. So we are getting the wrong css during cgroup_init_subsys(). Fortunately, cgrp_dfl_root.cgrp's css is not set yet, so the value we pass to css_alloc() is NULL anyway. Let's pass NULL directly during init, since we know there is no parent yet. Signed-off-by: Wei Yang <richard.weiyang@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>