cpuhotplug.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef __CPUHOTPLUG_H
  3#define __CPUHOTPLUG_H
  4
  5#include <linux/types.h>
  6
  7/*
  8 * CPU-up			CPU-down
  9 *
 10 * BP		AP		BP		AP
 11 *
 12 * OFFLINE			OFFLINE
 13 *   |				  ^
 14 *   v				  |
 15 * BRINGUP_CPU->AP_OFFLINE	BRINGUP_CPU  <- AP_IDLE_DEAD (idle thread/play_dead)
 16 *		  |				AP_OFFLINE
 17 *		  v (IRQ-off)	  ,---------------^
 18 *		AP_ONLNE	  | (stop_machine)
 19 *		  |		TEARDOWN_CPU <-	AP_ONLINE_IDLE
 20 *		  |				  ^
 21 *		  v				  |
 22 *              AP_ACTIVE			AP_ACTIVE
 23 */
 24
 25/*
 26 * CPU hotplug states. The state machine invokes the installed state
 27 * startup callbacks sequentially from CPUHP_OFFLINE + 1 to CPUHP_ONLINE
 28 * during a CPU online operation. During a CPU offline operation the
 29 * installed teardown callbacks are invoked in the reverse order from
 30 * CPUHP_ONLINE - 1 down to CPUHP_OFFLINE.
 31 *
 32 * The state space has three sections: PREPARE, STARTING and ONLINE.
 33 *
 34 * PREPARE: The callbacks are invoked on a control CPU before the
 35 * hotplugged CPU is started up or after the hotplugged CPU has died.
 36 *
 37 * STARTING: The callbacks are invoked on the hotplugged CPU from the low level
 38 * hotplug startup/teardown code with interrupts disabled.
 39 *
 40 * ONLINE: The callbacks are invoked on the hotplugged CPU from the per CPU
 41 * hotplug thread with interrupts and preemption enabled.
 42 *
 43 * Adding explicit states to this enum is only necessary when:
 44 *
 45 * 1) The state is within the STARTING section
 46 *
 47 * 2) The state has ordering constraints vs. other states in the
 48 *    same section.
 49 *
 50 * If neither #1 nor #2 apply, please use the dynamic state space when
 51 * setting up a state by using CPUHP_BP_PREPARE_DYN or CPUHP_AP_ONLINE_DYN
 52 * for the @state argument of the setup function.
 53 *
 54 * See Documentation/core-api/cpu_hotplug.rst for further information and
 55 * examples.
 56 */
 57enum cpuhp_state {
 58	CPUHP_INVALID = -1,
 59
 60	/* PREPARE section invoked on a control CPU */
 61	CPUHP_OFFLINE = 0,
 62	CPUHP_CREATE_THREADS,
 63	CPUHP_PERF_X86_PREPARE,
 64	CPUHP_PERF_X86_AMD_UNCORE_PREP,
 65	CPUHP_PERF_POWER,
 66	CPUHP_PERF_SUPERH,
 67	CPUHP_X86_HPET_DEAD,
 68	CPUHP_X86_MCE_DEAD,
 69	CPUHP_VIRT_NET_DEAD,
 70	CPUHP_IBMVNIC_DEAD,
 71	CPUHP_SLUB_DEAD,
 72	CPUHP_DEBUG_OBJ_DEAD,
 73	CPUHP_MM_WRITEBACK_DEAD,
 74	CPUHP_MM_VMSTAT_DEAD,
 75	CPUHP_SOFTIRQ_DEAD,
 76	CPUHP_NET_MVNETA_DEAD,
 77	CPUHP_CPUIDLE_DEAD,
 78	CPUHP_ARM64_FPSIMD_DEAD,
 79	CPUHP_ARM_OMAP_WAKE_DEAD,
 80	CPUHP_IRQ_POLL_DEAD,
 81	CPUHP_BLOCK_SOFTIRQ_DEAD,
 82	CPUHP_BIO_DEAD,
 83	CPUHP_ACPI_CPUDRV_DEAD,
 84	CPUHP_S390_PFAULT_DEAD,
 85	CPUHP_BLK_MQ_DEAD,
 86	CPUHP_FS_BUFF_DEAD,
 87	CPUHP_PRINTK_DEAD,
 88	CPUHP_MM_MEMCQ_DEAD,
 89	CPUHP_PERCPU_CNT_DEAD,
 90	CPUHP_RADIX_DEAD,
 91	CPUHP_PAGE_ALLOC,
 92	CPUHP_NET_DEV_DEAD,
 93	CPUHP_IOMMU_IOVA_DEAD,
 94	CPUHP_AP_ARM_CACHE_B15_RAC_DEAD,
 95	CPUHP_PADATA_DEAD,
 96	CPUHP_AP_DTPM_CPU_DEAD,
 97	CPUHP_RANDOM_PREPARE,
 98	CPUHP_WORKQUEUE_PREP,
 99	CPUHP_POWER_NUMA_PREPARE,
100	CPUHP_HRTIMERS_PREPARE,
101	CPUHP_X2APIC_PREPARE,
102	CPUHP_SMPCFD_PREPARE,
103	CPUHP_RELAY_PREPARE,
104	CPUHP_MD_RAID5_PREPARE,
105	CPUHP_RCUTREE_PREP,
106	CPUHP_CPUIDLE_COUPLED_PREPARE,
107	CPUHP_POWERPC_PMAC_PREPARE,
108	CPUHP_POWERPC_MMU_CTX_PREPARE,
109	CPUHP_XEN_PREPARE,
110	CPUHP_XEN_EVTCHN_PREPARE,
111	CPUHP_ARM_SHMOBILE_SCU_PREPARE,
112	CPUHP_SH_SH3X_PREPARE,
113	CPUHP_TOPOLOGY_PREPARE,
114	CPUHP_NET_IUCV_PREPARE,
115	CPUHP_ARM_BL_PREPARE,
116	CPUHP_TRACE_RB_PREPARE,
117	CPUHP_MM_ZSWP_POOL_PREPARE,
118	CPUHP_KVM_PPC_BOOK3S_PREPARE,
119	CPUHP_ZCOMP_PREPARE,
120	CPUHP_TIMERS_PREPARE,
121	CPUHP_TMIGR_PREPARE,
122	CPUHP_MIPS_SOC_PREPARE,
123	CPUHP_BP_PREPARE_DYN,
124	CPUHP_BP_PREPARE_DYN_END		= CPUHP_BP_PREPARE_DYN + 20,
125	CPUHP_BP_KICK_AP,
126	CPUHP_BRINGUP_CPU,
127
128	/*
129	 * STARTING section invoked on the hotplugged CPU in low level
130	 * bringup and teardown code.
131	 */
132	CPUHP_AP_IDLE_DEAD,
133	CPUHP_AP_OFFLINE,
134	CPUHP_AP_CACHECTRL_STARTING,
135	CPUHP_AP_SCHED_STARTING,
136	CPUHP_AP_RCUTREE_DYING,
137	CPUHP_AP_CPU_PM_STARTING,
138	CPUHP_AP_IRQ_GIC_STARTING,
139	CPUHP_AP_IRQ_HIP04_STARTING,
140	CPUHP_AP_IRQ_APPLE_AIC_STARTING,
141	CPUHP_AP_IRQ_ARMADA_XP_STARTING,
142	CPUHP_AP_IRQ_BCM2836_STARTING,
143	CPUHP_AP_IRQ_MIPS_GIC_STARTING,
144	CPUHP_AP_IRQ_EIOINTC_STARTING,
145	CPUHP_AP_IRQ_AVECINTC_STARTING,
146	CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
147	CPUHP_AP_IRQ_ACLINT_SSWI_STARTING,
148	CPUHP_AP_IRQ_RISCV_IMSIC_STARTING,
149	CPUHP_AP_IRQ_RISCV_SBI_IPI_STARTING,
150	CPUHP_AP_ARM_MVEBU_COHERENCY,
151	CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING,
152	CPUHP_AP_PERF_X86_STARTING,
153	CPUHP_AP_PERF_X86_AMD_IBS_STARTING,
154	CPUHP_AP_PERF_XTENSA_STARTING,
155	CPUHP_AP_ARM_VFP_STARTING,
156	CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING,
157	CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING,
158	CPUHP_AP_PERF_ARM_ACPI_STARTING,
159	CPUHP_AP_PERF_ARM_STARTING,
160	CPUHP_AP_PERF_RISCV_STARTING,
161	CPUHP_AP_ARM_L2X0_STARTING,
162	CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
163	CPUHP_AP_ARM_ARCH_TIMER_STARTING,
164	CPUHP_AP_ARM_ARCH_TIMER_EVTSTRM_STARTING,
165	CPUHP_AP_ARM_GLOBAL_TIMER_STARTING,
166	CPUHP_AP_JCORE_TIMER_STARTING,
167	CPUHP_AP_ARM_TWD_STARTING,
168	CPUHP_AP_QCOM_TIMER_STARTING,
169	CPUHP_AP_TEGRA_TIMER_STARTING,
170	CPUHP_AP_ARMADA_TIMER_STARTING,
171	CPUHP_AP_LOONGARCH_ARCH_TIMER_STARTING,
172	CPUHP_AP_MIPS_GIC_TIMER_STARTING,
173	CPUHP_AP_ARC_TIMER_STARTING,
174	CPUHP_AP_REALTEK_TIMER_STARTING,
175	CPUHP_AP_RISCV_TIMER_STARTING,
176	CPUHP_AP_CLINT_TIMER_STARTING,
177	CPUHP_AP_CSKY_TIMER_STARTING,
178	CPUHP_AP_TI_GP_TIMER_STARTING,
179	CPUHP_AP_HYPERV_TIMER_STARTING,
180	/* Must be the last timer callback */
181	CPUHP_AP_DUMMY_TIMER_STARTING,
182	CPUHP_AP_ARM_XEN_STARTING,
183	CPUHP_AP_ARM_XEN_RUNSTATE_STARTING,
184	CPUHP_AP_ARM_CORESIGHT_STARTING,
185	CPUHP_AP_ARM_CORESIGHT_CTI_STARTING,
186	CPUHP_AP_ARM64_ISNDEP_STARTING,
187	CPUHP_AP_SMPCFD_DYING,
188	CPUHP_AP_HRTIMERS_DYING,
189	CPUHP_AP_TICK_DYING,
190	CPUHP_AP_X86_TBOOT_DYING,
191	CPUHP_AP_ARM_CACHE_B15_RAC_DYING,
192	CPUHP_AP_ONLINE,
193	CPUHP_TEARDOWN_CPU,
194
195	/* Online section invoked on the hotplugged CPU from the hotplug thread */
196	CPUHP_AP_ONLINE_IDLE,
197	CPUHP_AP_HYPERV_ONLINE,
198	CPUHP_AP_KVM_ONLINE,
199	CPUHP_AP_SCHED_WAIT_EMPTY,
200	CPUHP_AP_SMPBOOT_THREADS,
201	CPUHP_AP_IRQ_AFFINITY_ONLINE,
202	CPUHP_AP_BLK_MQ_ONLINE,
203	CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS,
204	CPUHP_AP_X86_INTEL_EPB_ONLINE,
205	CPUHP_AP_PERF_ONLINE,
206	CPUHP_AP_PERF_X86_ONLINE,
207	CPUHP_AP_PERF_X86_UNCORE_ONLINE,
208	CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE,
209	CPUHP_AP_PERF_X86_AMD_POWER_ONLINE,
210	CPUHP_AP_PERF_S390_CF_ONLINE,
211	CPUHP_AP_PERF_S390_SF_ONLINE,
212	CPUHP_AP_PERF_ARM_CCI_ONLINE,
213	CPUHP_AP_PERF_ARM_CCN_ONLINE,
214	CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE,
215	CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
216	CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE,
217	CPUHP_AP_PERF_ARM_HISI_L3_ONLINE,
218	CPUHP_AP_PERF_ARM_HISI_PA_ONLINE,
219	CPUHP_AP_PERF_ARM_HISI_SLLC_ONLINE,
220	CPUHP_AP_PERF_ARM_HISI_PCIE_PMU_ONLINE,
221	CPUHP_AP_PERF_ARM_HNS3_PMU_ONLINE,
222	CPUHP_AP_PERF_ARM_L2X0_ONLINE,
223	CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
224	CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE,
225	CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE,
226	CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
227	CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE,
228	CPUHP_AP_PERF_ARM_MRVL_PEM_ONLINE,
229	CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE,
230	CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE,
231	CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE,
232	CPUHP_AP_PERF_POWERPC_TRACE_IMC_ONLINE,
233	CPUHP_AP_PERF_POWERPC_HV_24x7_ONLINE,
234	CPUHP_AP_PERF_POWERPC_HV_GPCI_ONLINE,
235	CPUHP_AP_PERF_CSKY_ONLINE,
236	CPUHP_AP_TMIGR_ONLINE,
237	CPUHP_AP_WATCHDOG_ONLINE,
238	CPUHP_AP_WORKQUEUE_ONLINE,
239	CPUHP_AP_RANDOM_ONLINE,
240	CPUHP_AP_RCUTREE_ONLINE,
241	CPUHP_AP_KTHREADS_ONLINE,
242	CPUHP_AP_BASE_CACHEINFO_ONLINE,
243	CPUHP_AP_ONLINE_DYN,
244	CPUHP_AP_ONLINE_DYN_END		= CPUHP_AP_ONLINE_DYN + 40,
245	CPUHP_AP_X86_HPET_ONLINE,
246	CPUHP_AP_X86_KVM_CLK_ONLINE,
247	CPUHP_AP_ACTIVE,
248	CPUHP_ONLINE,
249};
250
251int __cpuhp_setup_state(enum cpuhp_state state,	const char *name, bool invoke,
252			int (*startup)(unsigned int cpu),
253			int (*teardown)(unsigned int cpu), bool multi_instance);
254
255int __cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name,
256				   bool invoke,
257				   int (*startup)(unsigned int cpu),
258				   int (*teardown)(unsigned int cpu),
259				   bool multi_instance);
260/**
261 * cpuhp_setup_state - Setup hotplug state callbacks with calling the @startup
262 *                     callback
263 * @state:	The state for which the calls are installed
264 * @name:	Name of the callback (will be used in debug output)
265 * @startup:	startup callback function or NULL if not required
266 * @teardown:	teardown callback function or NULL if not required
267 *
268 * Installs the callback functions and invokes the @startup callback on
269 * the online cpus which have already reached the @state.
270 */
271static inline int cpuhp_setup_state(enum cpuhp_state state,
272				    const char *name,
273				    int (*startup)(unsigned int cpu),
274				    int (*teardown)(unsigned int cpu))
275{
276	return __cpuhp_setup_state(state, name, true, startup, teardown, false);
277}
278
279/**
280 * cpuhp_setup_state_cpuslocked - Setup hotplug state callbacks with calling
281 *				  @startup callback from a cpus_read_lock()
282 *				  held region
283 * @state:	The state for which the calls are installed
284 * @name:	Name of the callback (will be used in debug output)
285 * @startup:	startup callback function or NULL if not required
286 * @teardown:	teardown callback function or NULL if not required
287 *
288 * Same as cpuhp_setup_state() except that it must be invoked from within a
289 * cpus_read_lock() held region.
290 */
291static inline int cpuhp_setup_state_cpuslocked(enum cpuhp_state state,
292					       const char *name,
293					       int (*startup)(unsigned int cpu),
294					       int (*teardown)(unsigned int cpu))
295{
296	return __cpuhp_setup_state_cpuslocked(state, name, true, startup,
297					      teardown, false);
298}
299
300/**
301 * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the
302 *			       @startup callback
303 * @state:	The state for which the calls are installed
304 * @name:	Name of the callback.
305 * @startup:	startup callback function or NULL if not required
306 * @teardown:	teardown callback function or NULL if not required
307 *
308 * Same as cpuhp_setup_state() except that the @startup callback is not
309 * invoked during installation. NOP if SMP=n or HOTPLUG_CPU=n.
310 */
311static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state,
312					    const char *name,
313					    int (*startup)(unsigned int cpu),
314					    int (*teardown)(unsigned int cpu))
315{
316	return __cpuhp_setup_state(state, name, false, startup, teardown,
317				   false);
318}
319
320/**
321 * cpuhp_setup_state_nocalls_cpuslocked - Setup hotplug state callbacks without
322 *					  invoking the @startup callback from
323 *					  a cpus_read_lock() held region
324 *			       callbacks
325 * @state:	The state for which the calls are installed
326 * @name:	Name of the callback.
327 * @startup:	startup callback function or NULL if not required
328 * @teardown:	teardown callback function or NULL if not required
329 *
330 * Same as cpuhp_setup_state_nocalls() except that it must be invoked from
331 * within a cpus_read_lock() held region.
332 */
333static inline int cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state,
334						     const char *name,
335						     int (*startup)(unsigned int cpu),
336						     int (*teardown)(unsigned int cpu))
337{
338	return __cpuhp_setup_state_cpuslocked(state, name, false, startup,
339					    teardown, false);
340}
341
342/**
343 * cpuhp_setup_state_multi - Add callbacks for multi state
344 * @state:	The state for which the calls are installed
345 * @name:	Name of the callback.
346 * @startup:	startup callback function or NULL if not required
347 * @teardown:	teardown callback function or NULL if not required
348 *
349 * Sets the internal multi_instance flag and prepares a state to work as a multi
350 * instance callback. No callbacks are invoked at this point. The callbacks are
351 * invoked once an instance for this state are registered via
352 * cpuhp_state_add_instance() or cpuhp_state_add_instance_nocalls()
353 */
354static inline int cpuhp_setup_state_multi(enum cpuhp_state state,
355					  const char *name,
356					  int (*startup)(unsigned int cpu,
357							 struct hlist_node *node),
358					  int (*teardown)(unsigned int cpu,
359							  struct hlist_node *node))
360{
361	return __cpuhp_setup_state(state, name, false,
362				   (void *) startup,
363				   (void *) teardown, true);
364}
365
366int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node,
367			       bool invoke);
368int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state,
369					  struct hlist_node *node, bool invoke);
370
371/**
372 * cpuhp_state_add_instance - Add an instance for a state and invoke startup
373 *                            callback.
374 * @state:	The state for which the instance is installed
375 * @node:	The node for this individual state.
376 *
377 * Installs the instance for the @state and invokes the registered startup
378 * callback on the online cpus which have already reached the @state. The
379 * @state must have been earlier marked as multi-instance by
380 * cpuhp_setup_state_multi().
381 */
382static inline int cpuhp_state_add_instance(enum cpuhp_state state,
383					   struct hlist_node *node)
384{
385	return __cpuhp_state_add_instance(state, node, true);
386}
387
388/**
389 * cpuhp_state_add_instance_nocalls - Add an instance for a state without
390 *                                    invoking the startup callback.
391 * @state:	The state for which the instance is installed
392 * @node:	The node for this individual state.
393 *
394 * Installs the instance for the @state. The @state must have been earlier
395 * marked as multi-instance by cpuhp_setup_state_multi. NOP if SMP=n or
396 * HOTPLUG_CPU=n.
397 */
398static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state,
399						   struct hlist_node *node)
400{
401	return __cpuhp_state_add_instance(state, node, false);
402}
403
404/**
405 * cpuhp_state_add_instance_nocalls_cpuslocked - Add an instance for a state
406 *						 without invoking the startup
407 *						 callback from a cpus_read_lock()
408 *						 held region.
409 * @state:	The state for which the instance is installed
410 * @node:	The node for this individual state.
411 *
412 * Same as cpuhp_state_add_instance_nocalls() except that it must be
413 * invoked from within a cpus_read_lock() held region.
414 */
415static inline int
416cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state,
417					    struct hlist_node *node)
418{
419	return __cpuhp_state_add_instance_cpuslocked(state, node, false);
420}
421
422void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);
423void __cpuhp_remove_state_cpuslocked(enum cpuhp_state state, bool invoke);
424
425/**
426 * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown
427 * @state:	The state for which the calls are removed
428 *
429 * Removes the callback functions and invokes the teardown callback on
430 * the online cpus which have already reached the @state.
431 */
432static inline void cpuhp_remove_state(enum cpuhp_state state)
433{
434	__cpuhp_remove_state(state, true);
435}
436
437/**
438 * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking
439 *				the teardown callback
440 * @state:	The state for which the calls are removed
441 */
442static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state)
443{
444	__cpuhp_remove_state(state, false);
445}
446
447/**
448 * cpuhp_remove_state_nocalls_cpuslocked - Remove hotplug state callbacks without invoking
449 *					   teardown from a cpus_read_lock() held region.
450 * @state:	The state for which the calls are removed
451 *
452 * Same as cpuhp_remove_state nocalls() except that it must be invoked
453 * from within a cpus_read_lock() held region.
454 */
455static inline void cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state)
456{
457	__cpuhp_remove_state_cpuslocked(state, false);
458}
459
460/**
461 * cpuhp_remove_multi_state - Remove hotplug multi state callback
462 * @state:	The state for which the calls are removed
463 *
464 * Removes the callback functions from a multi state. This is the reverse of
465 * cpuhp_setup_state_multi(). All instances should have been removed before
466 * invoking this function.
467 */
468static inline void cpuhp_remove_multi_state(enum cpuhp_state state)
469{
470	__cpuhp_remove_state(state, false);
471}
472
473int __cpuhp_state_remove_instance(enum cpuhp_state state,
474				  struct hlist_node *node, bool invoke);
475
476/**
477 * cpuhp_state_remove_instance - Remove hotplug instance from state and invoke
478 *                               the teardown callback
479 * @state:	The state from which the instance is removed
480 * @node:	The node for this individual state.
481 *
482 * Removes the instance and invokes the teardown callback on the online cpus
483 * which have already reached @state.
484 */
485static inline int cpuhp_state_remove_instance(enum cpuhp_state state,
486					      struct hlist_node *node)
487{
488	return __cpuhp_state_remove_instance(state, node, true);
489}
490
491/**
492 * cpuhp_state_remove_instance_nocalls - Remove hotplug instance from state
493 *					 without invoking the teardown callback
494 * @state:	The state from which the instance is removed
495 * @node:	The node for this individual state.
496 *
497 * Removes the instance without invoking the teardown callback.
498 */
499static inline int cpuhp_state_remove_instance_nocalls(enum cpuhp_state state,
500						      struct hlist_node *node)
501{
502	return __cpuhp_state_remove_instance(state, node, false);
503}
504
505#ifdef CONFIG_SMP
506void cpuhp_online_idle(enum cpuhp_state state);
507#else
508static inline void cpuhp_online_idle(enum cpuhp_state state) { }
509#endif
510
511struct task_struct;
512
513void cpuhp_ap_sync_alive(void);
514void arch_cpuhp_sync_state_poll(void);
515void arch_cpuhp_cleanup_kick_cpu(unsigned int cpu);
516int arch_cpuhp_kick_ap_alive(unsigned int cpu, struct task_struct *tidle);
517bool arch_cpuhp_init_parallel_bringup(void);
518
519#ifdef CONFIG_HOTPLUG_CORE_SYNC_DEAD
520void cpuhp_ap_report_dead(void);
521void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu);
522#else
523static inline void cpuhp_ap_report_dead(void) { }
524static inline void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu) { }
525#endif
526
527#endif