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The cid mapping is built from the online cpu set at scheduler enable and stays valid for that set; routine hotplug invalidates it. The default cid behavior is to restart the scheduler so the mapping gets rebuilt against the new online set, and that requires not implementing cpu_online / cpu_offline (which suppress the kernel's ACT_RESTART). Drop the two ops along with their print_cpus() helper - the cluster view was only useful as a hotplug demo and is meaningless over the dense cid space the scheduler will move to. Wire main() to handle the ACT_RESTART exit by reopening the skel and reattaching, matching the pattern in scx_simple / scx_central / scx_flatcg etc. Reset optind so getopt re-parses argv into the fresh skel rodata each iteration. Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Cheng-Yang Chou <yphbchou0911@gmail.com> Reviewed-by: Changwoo Min <changwoo@igalia.com> Reviewed-by: Andrea Righi <arighi@nvidia.com>