51  * @single:	Single callback invocation
52  * @bringup:	Single callback bringup or teardown selector
55  *		single entry callback for install/remove
57  * @cb_state:	The state for a single callback (install/uninstall)
70 	bool			single;  member
124 		int		(*single)(unsigned int cpu);  member
129 		int		(*single)(unsigned int cpu);  member
150 	return bringup ? !step->startup.single : !step->teardown.single;  in cpuhp_step_empty()
158  * @node:	For multi-instance, do a single entry callback for install/remove
187 		cb = bringup ? step->startup.single : step->teardown.single;  in cpuhp_invoke_callback()
196 	/* Single invocation for instance add/remove */  in cpuhp_invoke_callback()
485 	st->single = false;  in cpuhp_set_state()
528 	if (!st->single && st->state == st->target)  in __cpuhp_kick_ap()
730  * Each invocation of this function by the smpboot thread does a single AP
734  *  - single: runs st->cb_state
763 	if (st->single) {  in cpuhp_thread_fun()
805 /* Invoke a single callback on a remote cpu */
835 	st->single = true;  in cpuhp_invoke_ap_callback()
1640 		.startup.single		= NULL,
1641 		.teardown.single	= NULL,
1646 		.startup.single		= smpboot_create_threads,
1647 		.teardown.single	= NULL,
1652 		.startup.single		= perf_event_init_cpu,
1653 		.teardown.single	= perf_event_exit_cpu,
1657 		.startup.single		= workqueue_prepare_cpu,
1658 		.teardown.single	= NULL,
1662 		.startup.single		= hrtimers_prepare_cpu,
1663 		.teardown.single	= hrtimers_dead_cpu,
1667 		.startup.single		= smpcfd_prepare_cpu,
1668 		.teardown.single	= smpcfd_dead_cpu,
1672 		.startup.single		= relay_prepare_cpu,
1673 		.teardown.single	= NULL,
1677 		.startup.single		= slab_prepare_cpu,
1678 		.teardown.single	= slab_dead_cpu,
1682 		.startup.single		= rcutree_prepare_cpu,
1683 		.teardown.single	= rcutree_dead_cpu,
1692 		.startup.single		= timers_prepare_cpu,
1693 		.teardown.single	= timers_dead_cpu,
1698 		.startup.single		= bringup_cpu,
1699 		.teardown.single	= finish_cpu,
1717 		.startup.single		= sched_cpu_starting,
1718 		.teardown.single	= sched_cpu_dying,
1722 		.startup.single		= NULL,
1723 		.teardown.single	= rcutree_dying_cpu,
1727 		.startup.single		= NULL,
1728 		.teardown.single	= smpcfd_dying_cpu,
1741 		.startup.single		= NULL,
1742 		.teardown.single	= takedown_cpu,
1748 		.startup.single		= NULL,
1749 		.teardown.single	= sched_cpu_wait_empty,
1755 		.startup.single		= smpboot_unpark_threads,
1756 		.teardown.single	= smpboot_park_threads,
1760 		.startup.single		= irq_affinity_online_cpu,
1761 		.teardown.single	= NULL,
1765 		.startup.single		= perf_event_init_cpu,
1766 		.teardown.single	= perf_event_exit_cpu,
1770 		.startup.single		= lockup_detector_online_cpu,
1771 		.teardown.single	= lockup_detector_offline_cpu,
1775 		.startup.single		= workqueue_online_cpu,
1776 		.teardown.single	= workqueue_offline_cpu,
1780 		.startup.single		= rcutree_online_cpu,
1781 		.teardown.single	= rcutree_offline_cpu,
1792 		.startup.single		= sched_cpu_activate,
1793 		.teardown.single	= sched_cpu_deactivate,
1800 		.startup.single		= NULL,
1801 		.teardown.single	= NULL,
1873 	sp->startup.single = startup;  in cpuhp_store_callbacks()
1874 	sp->teardown.single = teardown;  in cpuhp_store_callbacks()
1883 	return cpuhp_get_step(state)->teardown.single;  in cpuhp_get_teardown_cb()
2355 	if (!sp->startup.single && !sp->teardown.single)  in fail_store()
2553  * mask value that has a single bit set only.