This reverts commit d1ba277e.
I'm sorry but can you please revert the whole series?
get_active() waiting while a node is deactivated has potential
to lead to deadlock and that deactivate/reactivate interface is
something fundamentally flawed and that cgroup will have to work
with the remove_self() like everybody else. IOW, I think the
first posting was correct.
Cc: Tejun Heo <email@example.com>
Signed-off-by: Greg Kroah-Hartman <firstname.lastname@example.org>