73 	bool			single;  member
126 		int		(*single)(unsigned int cpu);  member
131 		int		(*single)(unsigned int cpu);  member
152 	return bringup ? !step->startup.single : !step->teardown.single;  in cpuhp_step_empty()
189 		cb = bringup ? step->startup.single : step->teardown.single;  in cpuhp_invoke_callback()
487 	st->single = false;  in cpuhp_set_state()
531 	if (!st->single && st->state == st->target)  in __cpuhp_kick_ap()
764 	if (st->single) {  in cpuhp_thread_fun()
836 	st->single = true;  in cpuhp_invoke_ap_callback()
1659 		.startup.single		= NULL,
1660 		.teardown.single	= NULL,
1665 		.startup.single		= smpboot_create_threads,
1666 		.teardown.single	= NULL,
1671 		.startup.single		= perf_event_init_cpu,
1672 		.teardown.single	= perf_event_exit_cpu,
1676 		.startup.single		= random_prepare_cpu,
1677 		.teardown.single	= NULL,
1681 		.startup.single		= workqueue_prepare_cpu,
1682 		.teardown.single	= NULL,
1686 		.startup.single		= hrtimers_prepare_cpu,
1687 		.teardown.single	= hrtimers_dead_cpu,
1691 		.startup.single		= smpcfd_prepare_cpu,
1692 		.teardown.single	= smpcfd_dead_cpu,
1696 		.startup.single		= relay_prepare_cpu,
1697 		.teardown.single	= NULL,
1701 		.startup.single		= slab_prepare_cpu,
1702 		.teardown.single	= slab_dead_cpu,
1706 		.startup.single		= rcutree_prepare_cpu,
1707 		.teardown.single	= rcutree_dead_cpu,
1716 		.startup.single		= timers_prepare_cpu,
1717 		.teardown.single	= timers_dead_cpu,
1722 		.startup.single		= bringup_cpu,
1723 		.teardown.single	= finish_cpu,
1741 		.startup.single		= sched_cpu_starting,
1742 		.teardown.single	= sched_cpu_dying,
1746 		.startup.single		= NULL,
1747 		.teardown.single	= rcutree_dying_cpu,
1751 		.startup.single		= NULL,
1752 		.teardown.single	= smpcfd_dying_cpu,
1765 		.startup.single		= NULL,
1766 		.teardown.single	= takedown_cpu,
1772 		.startup.single		= NULL,
1773 		.teardown.single	= sched_cpu_wait_empty,
1779 		.startup.single		= smpboot_unpark_threads,
1780 		.teardown.single	= smpboot_park_threads,
1784 		.startup.single		= irq_affinity_online_cpu,
1785 		.teardown.single	= NULL,
1789 		.startup.single		= perf_event_init_cpu,
1790 		.teardown.single	= perf_event_exit_cpu,
1794 		.startup.single		= lockup_detector_online_cpu,
1795 		.teardown.single	= lockup_detector_offline_cpu,
1799 		.startup.single		= workqueue_online_cpu,
1800 		.teardown.single	= workqueue_offline_cpu,
1804 		.startup.single		= random_online_cpu,
1805 		.teardown.single	= NULL,
1809 		.startup.single		= rcutree_online_cpu,
1810 		.teardown.single	= rcutree_offline_cpu,
1821 		.startup.single		= sched_cpu_activate,
1822 		.teardown.single	= sched_cpu_deactivate,
1829 		.startup.single		= NULL,
1830 		.teardown.single	= NULL,
1902 	sp->startup.single = startup;  in cpuhp_store_callbacks()
1903 	sp->teardown.single = teardown;  in cpuhp_store_callbacks()
1912 	return cpuhp_get_step(state)->teardown.single;  in cpuhp_get_teardown_cb()
2384 	if (!sp->startup.single && !sp->teardown.single)  in fail_store()