49  * @single:	Single callback invocation
50  * @bringup:	Single callback bringup or teardown selector
51  * @cb_state:	The state for a single callback (install/uninstall)
64 	bool			single;  member
116 		int		(*single)(unsigned int cpu);  member
121 		int		(*single)(unsigned int cpu);  member
143  * @node:	For multi-instance, do a single entry callback for install/remove
161 		if (!(bringup ? step->startup.single : step->teardown.single))  in cpuhp_invoke_callback()
169 		cb = bringup ? step->startup.single : step->teardown.single;  in cpuhp_invoke_callback()
181 	/* Single invocation for instance add/remove */  in cpuhp_invoke_callback()
462 	st->single = false;  in cpuhp_set_state()
491 	if (!st->single && st->state == st->target)  in __cpuhp_kick_ap()
649  * Each invocation of this function by the smpboot thread does a single AP
653  *  - single: runs st->cb_state
682 	if (st->single) {  in cpuhp_thread_fun()
731 /* Invoke a single callback on a remote cpu */
761 	st->single = true;  in cpuhp_invoke_ap_callback()
1513 		.startup.single		= NULL,
1514 		.teardown.single	= NULL,
1519 		.startup.single		= smpboot_create_threads,
1520 		.teardown.single	= NULL,
1525 		.startup.single		= perf_event_init_cpu,
1526 		.teardown.single	= perf_event_exit_cpu,
1530 		.startup.single		= workqueue_prepare_cpu,
1531 		.teardown.single	= NULL,
1535 		.startup.single		= hrtimers_prepare_cpu,
1536 		.teardown.single	= hrtimers_dead_cpu,
1540 		.startup.single		= smpcfd_prepare_cpu,
1541 		.teardown.single	= smpcfd_dead_cpu,
1545 		.startup.single		= relay_prepare_cpu,
1546 		.teardown.single	= NULL,
1550 		.startup.single		= slab_prepare_cpu,
1551 		.teardown.single	= slab_dead_cpu,
1555 		.startup.single		= rcutree_prepare_cpu,
1556 		.teardown.single	= rcutree_dead_cpu,
1565 		.startup.single		= timers_prepare_cpu,
1566 		.teardown.single	= timers_dead_cpu,
1571 		.startup.single		= bringup_cpu,
1572 		.teardown.single	= finish_cpu,
1590 		.startup.single		= sched_cpu_starting,
1591 		.teardown.single	= sched_cpu_dying,
1595 		.startup.single		= NULL,
1596 		.teardown.single	= rcutree_dying_cpu,
1600 		.startup.single		= NULL,
1601 		.teardown.single	= smpcfd_dying_cpu,
1614 		.startup.single		= NULL,
1615 		.teardown.single	= takedown_cpu,
1621 		.startup.single		= smpboot_unpark_threads,
1622 		.teardown.single	= smpboot_park_threads,
1626 		.startup.single		= irq_affinity_online_cpu,
1627 		.teardown.single	= NULL,
1631 		.startup.single		= perf_event_init_cpu,
1632 		.teardown.single	= perf_event_exit_cpu,
1636 		.startup.single		= lockup_detector_online_cpu,
1637 		.teardown.single	= lockup_detector_offline_cpu,
1641 		.startup.single		= workqueue_online_cpu,
1642 		.teardown.single	= workqueue_offline_cpu,
1646 		.startup.single		= rcutree_online_cpu,
1647 		.teardown.single	= rcutree_offline_cpu,
1658 		.startup.single		= sched_cpu_activate,
1659 		.teardown.single	= sched_cpu_deactivate,
1666 		.startup.single		= NULL,
1667 		.teardown.single	= NULL,
1739 	sp->startup.single = startup;  in cpuhp_store_callbacks()
1740 	sp->teardown.single = teardown;  in cpuhp_store_callbacks()
1749 	return cpuhp_get_step(state)->teardown.single;  in cpuhp_get_teardown_cb()
1766 	if ((bringup && !sp->startup.single) ||  in cpuhp_issue_call()
1767 	    (!bringup && !sp->teardown.single))  in cpuhp_issue_call()
2210 	if (!sp->startup.single && !sp->teardown.single)  in write_cpuhp_fail()
2409  * mask value that has a single bit set only.