xref: /linux/include/linux/cpuhotplug.h (revision d642ef71) 
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  * CPU_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  */
57 enum 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_PREPARE,
64 	CPUHP_PERF_X86_PREPARE,
65 	CPUHP_PERF_X86_AMD_UNCORE_PREP,
66 	CPUHP_PERF_POWER,
67 	CPUHP_PERF_SUPERH,
68 	CPUHP_X86_HPET_DEAD,
69 	CPUHP_X86_APB_DEAD,
70 	CPUHP_X86_MCE_DEAD,
71 	CPUHP_VIRT_NET_DEAD,
72 	CPUHP_IBMVNIC_DEAD,
73 	CPUHP_SLUB_DEAD,
74 	CPUHP_DEBUG_OBJ_DEAD,
75 	CPUHP_MM_WRITEBACK_DEAD,
76 	/* Must be after CPUHP_MM_VMSTAT_DEAD */
77 	CPUHP_MM_DEMOTION_DEAD,
78 	CPUHP_MM_VMSTAT_DEAD,
79 	CPUHP_SOFTIRQ_DEAD,
80 	CPUHP_NET_MVNETA_DEAD,
81 	CPUHP_CPUIDLE_DEAD,
82 	CPUHP_ARM64_FPSIMD_DEAD,
83 	CPUHP_ARM_OMAP_WAKE_DEAD,
84 	CPUHP_IRQ_POLL_DEAD,
85 	CPUHP_BLOCK_SOFTIRQ_DEAD,
86 	CPUHP_BIO_DEAD,
87 	CPUHP_ACPI_CPUDRV_DEAD,
88 	CPUHP_S390_PFAULT_DEAD,
89 	CPUHP_BLK_MQ_DEAD,
90 	CPUHP_FS_BUFF_DEAD,
91 	CPUHP_PRINTK_DEAD,
92 	CPUHP_MM_MEMCQ_DEAD,
93 	CPUHP_PERCPU_CNT_DEAD,
94 	CPUHP_RADIX_DEAD,
95 	CPUHP_PAGE_ALLOC,
96 	CPUHP_NET_DEV_DEAD,
97 	CPUHP_PCI_XGENE_DEAD,
98 	CPUHP_IOMMU_IOVA_DEAD,
99 	CPUHP_LUSTRE_CFS_DEAD,
100 	CPUHP_AP_ARM_CACHE_B15_RAC_DEAD,
101 	CPUHP_PADATA_DEAD,
102 	CPUHP_AP_DTPM_CPU_DEAD,
103 	CPUHP_RANDOM_PREPARE,
104 	CPUHP_WORKQUEUE_PREP,
105 	CPUHP_POWER_NUMA_PREPARE,
106 	CPUHP_HRTIMERS_PREPARE,
107 	CPUHP_PROFILE_PREPARE,
108 	CPUHP_X2APIC_PREPARE,
109 	CPUHP_SMPCFD_PREPARE,
110 	CPUHP_RELAY_PREPARE,
111 	CPUHP_SLAB_PREPARE,
112 	CPUHP_MD_RAID5_PREPARE,
113 	CPUHP_RCUTREE_PREP,
114 	CPUHP_CPUIDLE_COUPLED_PREPARE,
115 	CPUHP_POWERPC_PMAC_PREPARE,
116 	CPUHP_POWERPC_MMU_CTX_PREPARE,
117 	CPUHP_XEN_PREPARE,
118 	CPUHP_XEN_EVTCHN_PREPARE,
119 	CPUHP_ARM_SHMOBILE_SCU_PREPARE,
120 	CPUHP_SH_SH3X_PREPARE,
121 	CPUHP_NET_FLOW_PREPARE,
122 	CPUHP_TOPOLOGY_PREPARE,
123 	CPUHP_NET_IUCV_PREPARE,
124 	CPUHP_ARM_BL_PREPARE,
125 	CPUHP_TRACE_RB_PREPARE,
126 	CPUHP_MM_ZS_PREPARE,
127 	CPUHP_MM_ZSWP_MEM_PREPARE,
128 	CPUHP_MM_ZSWP_POOL_PREPARE,
129 	CPUHP_KVM_PPC_BOOK3S_PREPARE,
130 	CPUHP_ZCOMP_PREPARE,
131 	CPUHP_TIMERS_PREPARE,
132 	CPUHP_MIPS_SOC_PREPARE,
133 	CPUHP_BP_PREPARE_DYN,
134 	CPUHP_BP_PREPARE_DYN_END		= CPUHP_BP_PREPARE_DYN + 20,
135 	CPUHP_BP_KICK_AP,
136 	CPUHP_BRINGUP_CPU,
137 
138 	/*
139 	 * STARTING section invoked on the hotplugged CPU in low level
140 	 * bringup and teardown code.
141 	 */
142 	CPUHP_AP_IDLE_DEAD,
143 	CPUHP_AP_OFFLINE,
144 	CPUHP_AP_CACHECTRL_STARTING,
145 	CPUHP_AP_SCHED_STARTING,
146 	CPUHP_AP_RCUTREE_DYING,
147 	CPUHP_AP_CPU_PM_STARTING,
148 	CPUHP_AP_IRQ_GIC_STARTING,
149 	CPUHP_AP_IRQ_HIP04_STARTING,
150 	CPUHP_AP_IRQ_APPLE_AIC_STARTING,
151 	CPUHP_AP_IRQ_ARMADA_XP_STARTING,
152 	CPUHP_AP_IRQ_BCM2836_STARTING,
153 	CPUHP_AP_IRQ_MIPS_GIC_STARTING,
154 	CPUHP_AP_IRQ_RISCV_STARTING,
155 	CPUHP_AP_IRQ_LOONGARCH_STARTING,
156 	CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
157 	CPUHP_AP_ARM_MVEBU_COHERENCY,
158 	CPUHP_AP_MICROCODE_LOADER,
159 	CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING,
160 	CPUHP_AP_PERF_X86_STARTING,
161 	CPUHP_AP_PERF_X86_AMD_IBS_STARTING,
162 	CPUHP_AP_PERF_X86_CQM_STARTING,
163 	CPUHP_AP_PERF_X86_CSTATE_STARTING,
164 	CPUHP_AP_PERF_XTENSA_STARTING,
165 	CPUHP_AP_MIPS_OP_LOONGSON3_STARTING,
166 	CPUHP_AP_ARM_VFP_STARTING,
167 	CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING,
168 	CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING,
169 	CPUHP_AP_PERF_ARM_ACPI_STARTING,
170 	CPUHP_AP_PERF_ARM_STARTING,
171 	CPUHP_AP_PERF_RISCV_STARTING,
172 	CPUHP_AP_ARM_L2X0_STARTING,
173 	CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
174 	CPUHP_AP_ARM_ARCH_TIMER_STARTING,
175 	CPUHP_AP_ARM_ARCH_TIMER_EVTSTRM_STARTING,
176 	CPUHP_AP_ARM_GLOBAL_TIMER_STARTING,
177 	CPUHP_AP_JCORE_TIMER_STARTING,
178 	CPUHP_AP_ARM_TWD_STARTING,
179 	CPUHP_AP_QCOM_TIMER_STARTING,
180 	CPUHP_AP_TEGRA_TIMER_STARTING,
181 	CPUHP_AP_ARMADA_TIMER_STARTING,
182 	CPUHP_AP_MARCO_TIMER_STARTING,
183 	CPUHP_AP_MIPS_GIC_TIMER_STARTING,
184 	CPUHP_AP_ARC_TIMER_STARTING,
185 	CPUHP_AP_RISCV_TIMER_STARTING,
186 	CPUHP_AP_CLINT_TIMER_STARTING,
187 	CPUHP_AP_CSKY_TIMER_STARTING,
188 	CPUHP_AP_TI_GP_TIMER_STARTING,
189 	CPUHP_AP_HYPERV_TIMER_STARTING,
190 	/* Must be the last timer callback */
191 	CPUHP_AP_DUMMY_TIMER_STARTING,
192 	CPUHP_AP_ARM_XEN_STARTING,
193 	CPUHP_AP_ARM_XEN_RUNSTATE_STARTING,
194 	CPUHP_AP_ARM_CORESIGHT_STARTING,
195 	CPUHP_AP_ARM_CORESIGHT_CTI_STARTING,
196 	CPUHP_AP_ARM64_ISNDEP_STARTING,
197 	CPUHP_AP_SMPCFD_DYING,
198 	CPUHP_AP_HRTIMERS_DYING,
199 	CPUHP_AP_X86_TBOOT_DYING,
200 	CPUHP_AP_ARM_CACHE_B15_RAC_DYING,
201 	CPUHP_AP_ONLINE,
202 	CPUHP_TEARDOWN_CPU,
203 
204 	/* Online section invoked on the hotplugged CPU from the hotplug thread */
205 	CPUHP_AP_ONLINE_IDLE,
206 	CPUHP_AP_HYPERV_ONLINE,
207 	CPUHP_AP_KVM_ONLINE,
208 	CPUHP_AP_SCHED_WAIT_EMPTY,
209 	CPUHP_AP_SMPBOOT_THREADS,
210 	CPUHP_AP_IRQ_AFFINITY_ONLINE,
211 	CPUHP_AP_BLK_MQ_ONLINE,
212 	CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS,
213 	CPUHP_AP_X86_INTEL_EPB_ONLINE,
214 	CPUHP_AP_PERF_ONLINE,
215 	CPUHP_AP_PERF_X86_ONLINE,
216 	CPUHP_AP_PERF_X86_UNCORE_ONLINE,
217 	CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE,
218 	CPUHP_AP_PERF_X86_AMD_POWER_ONLINE,
219 	CPUHP_AP_PERF_X86_RAPL_ONLINE,
220 	CPUHP_AP_PERF_X86_CQM_ONLINE,
221 	CPUHP_AP_PERF_X86_CSTATE_ONLINE,
222 	CPUHP_AP_PERF_X86_IDXD_ONLINE,
223 	CPUHP_AP_PERF_S390_CF_ONLINE,
224 	CPUHP_AP_PERF_S390_SF_ONLINE,
225 	CPUHP_AP_PERF_ARM_CCI_ONLINE,
226 	CPUHP_AP_PERF_ARM_CCN_ONLINE,
227 	CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE,
228 	CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
229 	CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE,
230 	CPUHP_AP_PERF_ARM_HISI_L3_ONLINE,
231 	CPUHP_AP_PERF_ARM_HISI_PA_ONLINE,
232 	CPUHP_AP_PERF_ARM_HISI_SLLC_ONLINE,
233 	CPUHP_AP_PERF_ARM_HISI_PCIE_PMU_ONLINE,
234 	CPUHP_AP_PERF_ARM_HNS3_PMU_ONLINE,
235 	CPUHP_AP_PERF_ARM_L2X0_ONLINE,
236 	CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
237 	CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE,
238 	CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE,
239 	CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
240 	CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE,
241 	CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE,
242 	CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE,
243 	CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE,
244 	CPUHP_AP_PERF_POWERPC_TRACE_IMC_ONLINE,
245 	CPUHP_AP_PERF_POWERPC_HV_24x7_ONLINE,
246 	CPUHP_AP_PERF_POWERPC_HV_GPCI_ONLINE,
247 	CPUHP_AP_PERF_CSKY_ONLINE,
248 	CPUHP_AP_WATCHDOG_ONLINE,
249 	CPUHP_AP_WORKQUEUE_ONLINE,
250 	CPUHP_AP_RANDOM_ONLINE,
251 	CPUHP_AP_RCUTREE_ONLINE,
252 	CPUHP_AP_BASE_CACHEINFO_ONLINE,
253 	CPUHP_AP_ONLINE_DYN,
254 	CPUHP_AP_ONLINE_DYN_END		= CPUHP_AP_ONLINE_DYN + 30,
255 	/* Must be after CPUHP_AP_ONLINE_DYN for node_states[N_CPU] update */
256 	CPUHP_AP_MM_DEMOTION_ONLINE,
257 	CPUHP_AP_X86_HPET_ONLINE,
258 	CPUHP_AP_X86_KVM_CLK_ONLINE,
259 	CPUHP_AP_ACTIVE,
260 	CPUHP_ONLINE,
261 };
262 
263 int __cpuhp_setup_state(enum cpuhp_state state,	const char *name, bool invoke,
264 			int (*startup)(unsigned int cpu),
265 			int (*teardown)(unsigned int cpu), bool multi_instance);
266 
267 int __cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name,
268 				   bool invoke,
269 				   int (*startup)(unsigned int cpu),
270 				   int (*teardown)(unsigned int cpu),
271 				   bool multi_instance);
272 /**
273  * cpuhp_setup_state - Setup hotplug state callbacks with calling the @startup
274  *                     callback
275  * @state:	The state for which the calls are installed
276  * @name:	Name of the callback (will be used in debug output)
277  * @startup:	startup callback function or NULL if not required
278  * @teardown:	teardown callback function or NULL if not required
279  *
280  * Installs the callback functions and invokes the @startup callback on
281  * the online cpus which have already reached the @state.
282  */
283 static inline int cpuhp_setup_state(enum cpuhp_state state,
284 				    const char *name,
285 				    int (*startup)(unsigned int cpu),
286 				    int (*teardown)(unsigned int cpu))
287 {
288 	return __cpuhp_setup_state(state, name, true, startup, teardown, false);
289 }
290 
291 /**
292  * cpuhp_setup_state_cpuslocked - Setup hotplug state callbacks with calling
293  *				  @startup callback from a cpus_read_lock()
294  *				  held region
295  * @state:	The state for which the calls are installed
296  * @name:	Name of the callback (will be used in debug output)
297  * @startup:	startup callback function or NULL if not required
298  * @teardown:	teardown callback function or NULL if not required
299  *
300  * Same as cpuhp_setup_state() except that it must be invoked from within a
301  * cpus_read_lock() held region.
302  */
303 static inline int cpuhp_setup_state_cpuslocked(enum cpuhp_state state,
304 					       const char *name,
305 					       int (*startup)(unsigned int cpu),
306 					       int (*teardown)(unsigned int cpu))
307 {
308 	return __cpuhp_setup_state_cpuslocked(state, name, true, startup,
309 					      teardown, false);
310 }
311 
312 /**
313  * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the
314  *			       @startup callback
315  * @state:	The state for which the calls are installed
316  * @name:	Name of the callback.
317  * @startup:	startup callback function or NULL if not required
318  * @teardown:	teardown callback function or NULL if not required
319  *
320  * Same as cpuhp_setup_state() except that the @startup callback is not
321  * invoked during installation. NOP if SMP=n or HOTPLUG_CPU=n.
322  */
323 static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state,
324 					    const char *name,
325 					    int (*startup)(unsigned int cpu),
326 					    int (*teardown)(unsigned int cpu))
327 {
328 	return __cpuhp_setup_state(state, name, false, startup, teardown,
329 				   false);
330 }
331 
332 /**
333  * cpuhp_setup_state_nocalls_cpuslocked - Setup hotplug state callbacks without
334  *					  invoking the @startup callback from
335  *					  a cpus_read_lock() held region
336  *			       callbacks
337  * @state:	The state for which the calls are installed
338  * @name:	Name of the callback.
339  * @startup:	startup callback function or NULL if not required
340  * @teardown:	teardown callback function or NULL if not required
341  *
342  * Same as cpuhp_setup_state_nocalls() except that it must be invoked from
343  * within a cpus_read_lock() held region.
344  */
345 static inline int cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state,
346 						     const char *name,
347 						     int (*startup)(unsigned int cpu),
348 						     int (*teardown)(unsigned int cpu))
349 {
350 	return __cpuhp_setup_state_cpuslocked(state, name, false, startup,
351 					    teardown, false);
352 }
353 
354 /**
355  * cpuhp_setup_state_multi - Add callbacks for multi state
356  * @state:	The state for which the calls are installed
357  * @name:	Name of the callback.
358  * @startup:	startup callback function or NULL if not required
359  * @teardown:	teardown callback function or NULL if not required
360  *
361  * Sets the internal multi_instance flag and prepares a state to work as a multi
362  * instance callback. No callbacks are invoked at this point. The callbacks are
363  * invoked once an instance for this state are registered via
364  * cpuhp_state_add_instance() or cpuhp_state_add_instance_nocalls()
365  */
366 static inline int cpuhp_setup_state_multi(enum cpuhp_state state,
367 					  const char *name,
368 					  int (*startup)(unsigned int cpu,
369 							 struct hlist_node *node),
370 					  int (*teardown)(unsigned int cpu,
371 							  struct hlist_node *node))
372 {
373 	return __cpuhp_setup_state(state, name, false,
374 				   (void *) startup,
375 				   (void *) teardown, true);
376 }
377 
378 int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node,
379 			       bool invoke);
380 int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state,
381 					  struct hlist_node *node, bool invoke);
382 
383 /**
384  * cpuhp_state_add_instance - Add an instance for a state and invoke startup
385  *                            callback.
386  * @state:	The state for which the instance is installed
387  * @node:	The node for this individual state.
388  *
389  * Installs the instance for the @state and invokes the registered startup
390  * callback on the online cpus which have already reached the @state. The
391  * @state must have been earlier marked as multi-instance by
392  * cpuhp_setup_state_multi().
393  */
394 static inline int cpuhp_state_add_instance(enum cpuhp_state state,
395 					   struct hlist_node *node)
396 {
397 	return __cpuhp_state_add_instance(state, node, true);
398 }
399 
400 /**
401  * cpuhp_state_add_instance_nocalls - Add an instance for a state without
402  *                                    invoking the startup callback.
403  * @state:	The state for which the instance is installed
404  * @node:	The node for this individual state.
405  *
406  * Installs the instance for the @state. The @state must have been earlier
407  * marked as multi-instance by cpuhp_setup_state_multi. NOP if SMP=n or
408  * HOTPLUG_CPU=n.
409  */
410 static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state,
411 						   struct hlist_node *node)
412 {
413 	return __cpuhp_state_add_instance(state, node, false);
414 }
415 
416 /**
417  * cpuhp_state_add_instance_nocalls_cpuslocked - Add an instance for a state
418  *						 without invoking the startup
419  *						 callback from a cpus_read_lock()
420  *						 held region.
421  * @state:	The state for which the instance is installed
422  * @node:	The node for this individual state.
423  *
424  * Same as cpuhp_state_add_instance_nocalls() except that it must be
425  * invoked from within a cpus_read_lock() held region.
426  */
427 static inline int
428 cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state,
429 					    struct hlist_node *node)
430 {
431 	return __cpuhp_state_add_instance_cpuslocked(state, node, false);
432 }
433 
434 void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);
435 void __cpuhp_remove_state_cpuslocked(enum cpuhp_state state, bool invoke);
436 
437 /**
438  * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown
439  * @state:	The state for which the calls are removed
440  *
441  * Removes the callback functions and invokes the teardown callback on
442  * the online cpus which have already reached the @state.
443  */
444 static inline void cpuhp_remove_state(enum cpuhp_state state)
445 {
446 	__cpuhp_remove_state(state, true);
447 }
448 
449 /**
450  * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking
451  *				the teardown callback
452  * @state:	The state for which the calls are removed
453  */
454 static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state)
455 {
456 	__cpuhp_remove_state(state, false);
457 }
458 
459 /**
460  * cpuhp_remove_state_nocalls_cpuslocked - Remove hotplug state callbacks without invoking
461  *					   teardown from a cpus_read_lock() held region.
462  * @state:	The state for which the calls are removed
463  *
464  * Same as cpuhp_remove_state nocalls() except that it must be invoked
465  * from within a cpus_read_lock() held region.
466  */
467 static inline void cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state)
468 {
469 	__cpuhp_remove_state_cpuslocked(state, false);
470 }
471 
472 /**
473  * cpuhp_remove_multi_state - Remove hotplug multi state callback
474  * @state:	The state for which the calls are removed
475  *
476  * Removes the callback functions from a multi state. This is the reverse of
477  * cpuhp_setup_state_multi(). All instances should have been removed before
478  * invoking this function.
479  */
480 static inline void cpuhp_remove_multi_state(enum cpuhp_state state)
481 {
482 	__cpuhp_remove_state(state, false);
483 }
484 
485 int __cpuhp_state_remove_instance(enum cpuhp_state state,
486 				  struct hlist_node *node, bool invoke);
487 
488 /**
489  * cpuhp_state_remove_instance - Remove hotplug instance from state and invoke
490  *                               the teardown callback
491  * @state:	The state from which the instance is removed
492  * @node:	The node for this individual state.
493  *
494  * Removes the instance and invokes the teardown callback on the online cpus
495  * which have already reached @state.
496  */
497 static inline int cpuhp_state_remove_instance(enum cpuhp_state state,
498 					      struct hlist_node *node)
499 {
500 	return __cpuhp_state_remove_instance(state, node, true);
501 }
502 
503 /**
504  * cpuhp_state_remove_instance_nocalls - Remove hotplug instance from state
505  *					 without invoking the teardown callback
506  * @state:	The state from which the instance is removed
507  * @node:	The node for this individual state.
508  *
509  * Removes the instance without invoking the teardown callback.
510  */
511 static inline int cpuhp_state_remove_instance_nocalls(enum cpuhp_state state,
512 						      struct hlist_node *node)
513 {
514 	return __cpuhp_state_remove_instance(state, node, false);
515 }
516 
517 #ifdef CONFIG_SMP
518 void cpuhp_online_idle(enum cpuhp_state state);
519 #else
520 static inline void cpuhp_online_idle(enum cpuhp_state state) { }
521 #endif
522 
523 struct task_struct;
524 
525 void cpuhp_ap_sync_alive(void);
526 void arch_cpuhp_sync_state_poll(void);
527 void arch_cpuhp_cleanup_kick_cpu(unsigned int cpu);
528 int arch_cpuhp_kick_ap_alive(unsigned int cpu, struct task_struct *tidle);
529 bool arch_cpuhp_init_parallel_bringup(void);
530 
531 #ifdef CONFIG_HOTPLUG_CORE_SYNC_DEAD
532 void cpuhp_ap_report_dead(void);
533 void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu);
534 #else
535 static inline void cpuhp_ap_report_dead(void) { }
536 static inline void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu) { }
537 #endif
538 
539 #endif
540