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I don't follow — I'm not reinventing anything here. Patch 3 will use the existing CPU-hotplug callback interface: cpuhp_setup_state() with a down callback that returns -EBUSY to refuse the offline while SNP is active. That's the standard mechanism for conditionally preventing a CPU offline, and it keeps no private "hotplug disabled" state of its own — so there's nothing here for a getter on cpu_hotplug_disabled to replace. I chose the cpuhp callback specifically over cpu_hotplug_disable_offlining(): the callback can be torn down with cpuhp_remove_state() when SNP is fully shut down, which re-enables CPU offlining. cpu_hotplug_disable_offlining() sets cpu_hotplug_offline_disabled, which is __ro_after_init and one-way — there's no interface to clear it, and adding one would mean dropping the __ro_after_init marking and a new core "re-enable offlining" API. So that route can't re-enable offlining on SNP shutdown without new core plumbing, whereas the cpuhp callback gives me that for free. Happy to go whichever way you/tglx prefers — if there's a specific variable/getter you had in mind, please point me at it. Thanks, Ashish