48  * @single:	Single callback invocation
49  * @bringup:	Single callback bringup or teardown selector
50  * @cb_state:	The state for a single callback (install/uninstall)
63 	bool			single;  member
115 		int		(*single)(unsigned int cpu);  member
120 		int		(*single)(unsigned int cpu);  member
142  * @node:	For multi-instance, do a single entry callback for install/remove
160 		if (!(bringup ? step->startup.single : step->teardown.single))  in cpuhp_invoke_callback()
168 		cb = bringup ? step->startup.single : step->teardown.single;  in cpuhp_invoke_callback()
180 	/* Single invocation for instance add/remove */  in cpuhp_invoke_callback()
461 	st->single = false;  in cpuhp_set_state()
490 	if (!st->single && st->state == st->target)  in __cpuhp_kick_ap()
634  * Each invocation of this function by the smpboot thread does a single AP
638  *  - single: runs st->cb_state
667 	if (st->single) {  in cpuhp_thread_fun()
716 /* Invoke a single callback on a remote cpu */
746 	st->single = true;  in cpuhp_invoke_ap_callback()
1373 		.startup.single		= NULL,
1374 		.teardown.single	= NULL,
1379 		.startup.single		= smpboot_create_threads,
1380 		.teardown.single	= NULL,
1385 		.startup.single		= perf_event_init_cpu,
1386 		.teardown.single	= perf_event_exit_cpu,
1390 		.startup.single		= workqueue_prepare_cpu,
1391 		.teardown.single	= NULL,
1395 		.startup.single		= hrtimers_prepare_cpu,
1396 		.teardown.single	= hrtimers_dead_cpu,
1400 		.startup.single		= smpcfd_prepare_cpu,
1401 		.teardown.single	= smpcfd_dead_cpu,
1405 		.startup.single		= relay_prepare_cpu,
1406 		.teardown.single	= NULL,
1410 		.startup.single		= slab_prepare_cpu,
1411 		.teardown.single	= slab_dead_cpu,
1415 		.startup.single		= rcutree_prepare_cpu,
1416 		.teardown.single	= rcutree_dead_cpu,
1425 		.startup.single		= timers_prepare_cpu,
1426 		.teardown.single	= timers_dead_cpu,
1431 		.startup.single		= bringup_cpu,
1432 		.teardown.single	= NULL,
1450 		.startup.single		= sched_cpu_starting,
1451 		.teardown.single	= sched_cpu_dying,
1455 		.startup.single		= NULL,
1456 		.teardown.single	= rcutree_dying_cpu,
1460 		.startup.single		= NULL,
1461 		.teardown.single	= smpcfd_dying_cpu,
1474 		.startup.single		= NULL,
1475 		.teardown.single	= takedown_cpu,
1481 		.startup.single		= smpboot_unpark_threads,
1482 		.teardown.single	= smpboot_park_threads,
1486 		.startup.single		= irq_affinity_online_cpu,
1487 		.teardown.single	= NULL,
1491 		.startup.single		= perf_event_init_cpu,
1492 		.teardown.single	= perf_event_exit_cpu,
1496 		.startup.single		= lockup_detector_online_cpu,
1497 		.teardown.single	= lockup_detector_offline_cpu,
1501 		.startup.single		= workqueue_online_cpu,
1502 		.teardown.single	= workqueue_offline_cpu,
1506 		.startup.single		= rcutree_online_cpu,
1507 		.teardown.single	= rcutree_offline_cpu,
1518 		.startup.single		= sched_cpu_activate,
1519 		.teardown.single	= sched_cpu_deactivate,
1526 		.startup.single		= NULL,
1527 		.teardown.single	= NULL,
1599 	sp->startup.single = startup;  in cpuhp_store_callbacks()
1600 	sp->teardown.single = teardown;  in cpuhp_store_callbacks()
1609 	return cpuhp_get_step(state)->teardown.single;  in cpuhp_get_teardown_cb()
1626 	if ((bringup && !sp->startup.single) ||  in cpuhp_issue_call()
1627 	    (!bringup && !sp->teardown.single))  in cpuhp_issue_call()
1998 	if (!sp->startup.single && !sp->teardown.single)  in write_cpuhp_fail()
2268  * mask value that has a single bit set only.