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 */
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_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_AP_DTPM_CPU_DEAD,
96 CPUHP_RANDOM_PREPARE,
97 CPUHP_WORKQUEUE_PREP,
98 CPUHP_POWER_NUMA_PREPARE,
99 CPUHP_HRTIMERS_PREPARE,
100 CPUHP_X2APIC_PREPARE,
101 CPUHP_SMPCFD_PREPARE,
102 CPUHP_RELAY_PREPARE,
103 CPUHP_MD_RAID5_PREPARE,
104 CPUHP_RCUTREE_PREP,
105 CPUHP_CPUIDLE_COUPLED_PREPARE,
106 CPUHP_POWERPC_PMAC_PREPARE,
107 CPUHP_POWERPC_MMU_CTX_PREPARE,
108 CPUHP_XEN_PREPARE,
109 CPUHP_XEN_EVTCHN_PREPARE,
110 CPUHP_ARM_SHMOBILE_SCU_PREPARE,
111 CPUHP_SH_SH3X_PREPARE,
112 CPUHP_TOPOLOGY_PREPARE,
113 CPUHP_NET_IUCV_PREPARE,
114 CPUHP_ARM_BL_PREPARE,
115 CPUHP_TRACE_RB_PREPARE,
116 CPUHP_MM_ZSWP_POOL_PREPARE,
117 CPUHP_KVM_PPC_BOOK3S_PREPARE,
118 CPUHP_ZCOMP_PREPARE,
119 CPUHP_TIMERS_PREPARE,
120 CPUHP_TMIGR_PREPARE,
121 CPUHP_MIPS_SOC_PREPARE,
122 CPUHP_BP_PREPARE_DYN,
123 CPUHP_BP_PREPARE_DYN_END = CPUHP_BP_PREPARE_DYN + 20,
124 CPUHP_BP_KICK_AP,
125 CPUHP_BRINGUP_CPU,
126
127 /*
128 * STARTING section invoked on the hotplugged CPU in low level
129 * bringup and teardown code.
130 */
131 CPUHP_AP_IDLE_DEAD,
132 CPUHP_AP_OFFLINE,
133 CPUHP_AP_CACHECTRL_STARTING,
134 CPUHP_AP_SCHED_STARTING,
135 CPUHP_AP_RCUTREE_DYING,
136 CPUHP_AP_CPU_PM_STARTING,
137 CPUHP_AP_IRQ_GIC_STARTING,
138 CPUHP_AP_IRQ_HIP04_STARTING,
139 CPUHP_AP_IRQ_APPLE_AIC_STARTING,
140 CPUHP_AP_IRQ_ARMADA_XP_STARTING,
141 CPUHP_AP_IRQ_BCM2836_STARTING,
142 CPUHP_AP_IRQ_MIPS_GIC_STARTING,
143 CPUHP_AP_IRQ_EIOINTC_STARTING,
144 CPUHP_AP_IRQ_AVECINTC_STARTING,
145 CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
146 CPUHP_AP_IRQ_ACLINT_SSWI_STARTING,
147 CPUHP_AP_IRQ_RISCV_IMSIC_STARTING,
148 CPUHP_AP_IRQ_RISCV_SBI_IPI_STARTING,
149 CPUHP_AP_ARM_MVEBU_COHERENCY,
150 CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING,
151 CPUHP_AP_PERF_X86_STARTING,
152 CPUHP_AP_PERF_X86_AMD_IBS_STARTING,
153 CPUHP_AP_PERF_XTENSA_STARTING,
154 CPUHP_AP_ARM_VFP_STARTING,
155 CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING,
156 CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING,
157 CPUHP_AP_PERF_ARM_ACPI_STARTING,
158 CPUHP_AP_PERF_ARM_STARTING,
159 CPUHP_AP_PERF_RISCV_STARTING,
160 CPUHP_AP_ARM_L2X0_STARTING,
161 CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
162 CPUHP_AP_ARM_ARCH_TIMER_STARTING,
163 CPUHP_AP_ARM_ARCH_TIMER_EVTSTRM_STARTING,
164 CPUHP_AP_ARM_GLOBAL_TIMER_STARTING,
165 CPUHP_AP_JCORE_TIMER_STARTING,
166 CPUHP_AP_ARM_TWD_STARTING,
167 CPUHP_AP_QCOM_TIMER_STARTING,
168 CPUHP_AP_TEGRA_TIMER_STARTING,
169 CPUHP_AP_ARMADA_TIMER_STARTING,
170 CPUHP_AP_LOONGARCH_ARCH_TIMER_STARTING,
171 CPUHP_AP_MIPS_GIC_TIMER_STARTING,
172 CPUHP_AP_ARC_TIMER_STARTING,
173 CPUHP_AP_REALTEK_TIMER_STARTING,
174 CPUHP_AP_RISCV_TIMER_STARTING,
175 CPUHP_AP_CLINT_TIMER_STARTING,
176 CPUHP_AP_CSKY_TIMER_STARTING,
177 CPUHP_AP_TI_GP_TIMER_STARTING,
178 CPUHP_AP_HYPERV_TIMER_STARTING,
179 /* Must be the last timer callback */
180 CPUHP_AP_DUMMY_TIMER_STARTING,
181 CPUHP_AP_ARM_XEN_STARTING,
182 CPUHP_AP_ARM_XEN_RUNSTATE_STARTING,
183 CPUHP_AP_ARM64_ISNDEP_STARTING,
184 CPUHP_AP_SMPCFD_DYING,
185 CPUHP_AP_HRTIMERS_DYING,
186 CPUHP_AP_TICK_DYING,
187 CPUHP_AP_X86_TBOOT_DYING,
188 CPUHP_AP_ARM_CACHE_B15_RAC_DYING,
189 CPUHP_AP_ONLINE,
190 CPUHP_TEARDOWN_CPU,
191
192 /* Online section invoked on the hotplugged CPU from the hotplug thread */
193 CPUHP_AP_ONLINE_IDLE,
194 CPUHP_AP_HYPERV_ONLINE,
195 CPUHP_AP_KVM_ONLINE,
196 CPUHP_AP_SCHED_WAIT_EMPTY,
197 CPUHP_AP_SMPBOOT_THREADS,
198 CPUHP_AP_IRQ_AFFINITY_ONLINE,
199 CPUHP_AP_BLK_MQ_ONLINE,
200 CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS,
201 CPUHP_AP_ARM_CORESIGHT_ONLINE,
202 CPUHP_AP_X86_INTEL_EPB_ONLINE,
203 CPUHP_AP_PERF_ONLINE,
204 CPUHP_AP_PERF_X86_ONLINE,
205 CPUHP_AP_PERF_X86_UNCORE_ONLINE,
206 CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE,
207 CPUHP_AP_PERF_X86_AMD_POWER_ONLINE,
208 CPUHP_AP_PERF_S390_CF_ONLINE,
209 CPUHP_AP_PERF_S390_SF_ONLINE,
210 CPUHP_AP_PERF_ARM_CCI_ONLINE,
211 CPUHP_AP_PERF_ARM_CCN_ONLINE,
212 CPUHP_AP_PERF_ARM_HISI_PCIE_PMU_ONLINE,
213 CPUHP_AP_PERF_ARM_HNS3_PMU_ONLINE,
214 CPUHP_AP_PERF_ARM_L2X0_ONLINE,
215 CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
216 CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE,
217 CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE,
218 CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
219 CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE,
220 CPUHP_AP_PERF_ARM_MRVL_PEM_ONLINE,
221 CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE,
222 CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE,
223 CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE,
224 CPUHP_AP_PERF_POWERPC_TRACE_IMC_ONLINE,
225 CPUHP_AP_PERF_POWERPC_HV_24x7_ONLINE,
226 CPUHP_AP_PERF_POWERPC_HV_GPCI_ONLINE,
227 CPUHP_AP_PERF_CSKY_ONLINE,
228 CPUHP_AP_TMIGR_ONLINE,
229 CPUHP_AP_WATCHDOG_ONLINE,
230 CPUHP_AP_WORKQUEUE_ONLINE,
231 CPUHP_AP_RANDOM_ONLINE,
232 CPUHP_AP_RCUTREE_ONLINE,
233 CPUHP_AP_KTHREADS_ONLINE,
234 CPUHP_AP_BASE_CACHEINFO_ONLINE,
235 CPUHP_AP_ONLINE_DYN,
236 CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 40,
237 CPUHP_AP_X86_HPET_ONLINE,
238 CPUHP_AP_X86_KVM_CLK_ONLINE,
239 CPUHP_AP_ACTIVE,
240 CPUHP_ONLINE,
241 };
242
243 int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke,
244 int (*startup)(unsigned int cpu),
245 int (*teardown)(unsigned int cpu), bool multi_instance);
246
247 int __cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name,
248 bool invoke,
249 int (*startup)(unsigned int cpu),
250 int (*teardown)(unsigned int cpu),
251 bool multi_instance);
252 /**
253 * cpuhp_setup_state - Setup hotplug state callbacks with calling the @startup
254 * callback
255 * @state: The state for which the calls are installed
256 * @name: Name of the callback (will be used in debug output)
257 * @startup: startup callback function or NULL if not required
258 * @teardown: teardown callback function or NULL if not required
259 *
260 * Installs the callback functions and invokes the @startup callback on
261 * the online cpus which have already reached the @state.
262 */
cpuhp_setup_state(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))263 static inline int cpuhp_setup_state(enum cpuhp_state state,
264 const char *name,
265 int (*startup)(unsigned int cpu),
266 int (*teardown)(unsigned int cpu))
267 {
268 return __cpuhp_setup_state(state, name, true, startup, teardown, false);
269 }
270
271 /**
272 * cpuhp_setup_state_cpuslocked - Setup hotplug state callbacks with calling
273 * @startup callback from a cpus_read_lock()
274 * held region
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 * Same as cpuhp_setup_state() except that it must be invoked from within a
281 * cpus_read_lock() held region.
282 */
cpuhp_setup_state_cpuslocked(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))283 static inline int cpuhp_setup_state_cpuslocked(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_cpuslocked(state, name, true, startup,
289 teardown, false);
290 }
291
292 /**
293 * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the
294 * @startup callback
295 * @state: The state for which the calls are installed
296 * @name: Name of the callback.
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 the @startup callback is not
301 * invoked during installation. NOP if SMP=n or HOTPLUG_CPU=n.
302 */
cpuhp_setup_state_nocalls(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))303 static inline int cpuhp_setup_state_nocalls(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(state, name, false, startup, teardown,
309 false);
310 }
311
312 /**
313 * cpuhp_setup_state_nocalls_cpuslocked - Setup hotplug state callbacks without
314 * invoking the @startup callback from
315 * a cpus_read_lock() held region
316 * callbacks
317 * @state: The state for which the calls are installed
318 * @name: Name of the callback.
319 * @startup: startup callback function or NULL if not required
320 * @teardown: teardown callback function or NULL if not required
321 *
322 * Same as cpuhp_setup_state_nocalls() except that it must be invoked from
323 * within a cpus_read_lock() held region.
324 */
cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))325 static inline int cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state,
326 const char *name,
327 int (*startup)(unsigned int cpu),
328 int (*teardown)(unsigned int cpu))
329 {
330 return __cpuhp_setup_state_cpuslocked(state, name, false, startup,
331 teardown, false);
332 }
333
334 /**
335 * cpuhp_setup_state_multi - Add callbacks for multi state
336 * @state: The state for which the calls are installed
337 * @name: Name of the callback.
338 * @startup: startup callback function or NULL if not required
339 * @teardown: teardown callback function or NULL if not required
340 *
341 * Sets the internal multi_instance flag and prepares a state to work as a multi
342 * instance callback. No callbacks are invoked at this point. The callbacks are
343 * invoked once an instance for this state are registered via
344 * cpuhp_state_add_instance() or cpuhp_state_add_instance_nocalls()
345 */
cpuhp_setup_state_multi(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu,struct hlist_node * node),int (* teardown)(unsigned int cpu,struct hlist_node * node))346 static inline int cpuhp_setup_state_multi(enum cpuhp_state state,
347 const char *name,
348 int (*startup)(unsigned int cpu,
349 struct hlist_node *node),
350 int (*teardown)(unsigned int cpu,
351 struct hlist_node *node))
352 {
353 return __cpuhp_setup_state(state, name, false,
354 (void *) startup,
355 (void *) teardown, true);
356 }
357
358 int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node,
359 bool invoke);
360 int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state,
361 struct hlist_node *node, bool invoke);
362
363 /**
364 * cpuhp_state_add_instance - Add an instance for a state and invoke startup
365 * callback.
366 * @state: The state for which the instance is installed
367 * @node: The node for this individual state.
368 *
369 * Installs the instance for the @state and invokes the registered startup
370 * callback on the online cpus which have already reached the @state. The
371 * @state must have been earlier marked as multi-instance by
372 * cpuhp_setup_state_multi().
373 */
cpuhp_state_add_instance(enum cpuhp_state state,struct hlist_node * node)374 static inline int cpuhp_state_add_instance(enum cpuhp_state state,
375 struct hlist_node *node)
376 {
377 return __cpuhp_state_add_instance(state, node, true);
378 }
379
380 /**
381 * cpuhp_state_add_instance_nocalls - Add an instance for a state without
382 * invoking the startup callback.
383 * @state: The state for which the instance is installed
384 * @node: The node for this individual state.
385 *
386 * Installs the instance for the @state. The @state must have been earlier
387 * marked as multi-instance by cpuhp_setup_state_multi. NOP if SMP=n or
388 * HOTPLUG_CPU=n.
389 */
cpuhp_state_add_instance_nocalls(enum cpuhp_state state,struct hlist_node * node)390 static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state,
391 struct hlist_node *node)
392 {
393 return __cpuhp_state_add_instance(state, node, false);
394 }
395
396 /**
397 * cpuhp_state_add_instance_nocalls_cpuslocked - Add an instance for a state
398 * without invoking the startup
399 * callback from a cpus_read_lock()
400 * held region.
401 * @state: The state for which the instance is installed
402 * @node: The node for this individual state.
403 *
404 * Same as cpuhp_state_add_instance_nocalls() except that it must be
405 * invoked from within a cpus_read_lock() held region.
406 */
407 static inline int
cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state,struct hlist_node * node)408 cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state,
409 struct hlist_node *node)
410 {
411 return __cpuhp_state_add_instance_cpuslocked(state, node, false);
412 }
413
414 void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);
415 void __cpuhp_remove_state_cpuslocked(enum cpuhp_state state, bool invoke);
416
417 /**
418 * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown
419 * @state: The state for which the calls are removed
420 *
421 * Removes the callback functions and invokes the teardown callback on
422 * the online cpus which have already reached the @state.
423 */
cpuhp_remove_state(enum cpuhp_state state)424 static inline void cpuhp_remove_state(enum cpuhp_state state)
425 {
426 __cpuhp_remove_state(state, true);
427 }
428
429 /**
430 * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking
431 * the teardown callback
432 * @state: The state for which the calls are removed
433 */
cpuhp_remove_state_nocalls(enum cpuhp_state state)434 static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state)
435 {
436 __cpuhp_remove_state(state, false);
437 }
438
439 /**
440 * cpuhp_remove_state_nocalls_cpuslocked - Remove hotplug state callbacks without invoking
441 * teardown from a cpus_read_lock() held region.
442 * @state: The state for which the calls are removed
443 *
444 * Same as cpuhp_remove_state nocalls() except that it must be invoked
445 * from within a cpus_read_lock() held region.
446 */
cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state)447 static inline void cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state)
448 {
449 __cpuhp_remove_state_cpuslocked(state, false);
450 }
451
452 /**
453 * cpuhp_remove_multi_state - Remove hotplug multi state callback
454 * @state: The state for which the calls are removed
455 *
456 * Removes the callback functions from a multi state. This is the reverse of
457 * cpuhp_setup_state_multi(). All instances should have been removed before
458 * invoking this function.
459 */
cpuhp_remove_multi_state(enum cpuhp_state state)460 static inline void cpuhp_remove_multi_state(enum cpuhp_state state)
461 {
462 __cpuhp_remove_state(state, false);
463 }
464
465 int __cpuhp_state_remove_instance(enum cpuhp_state state,
466 struct hlist_node *node, bool invoke);
467
468 /**
469 * cpuhp_state_remove_instance - Remove hotplug instance from state and invoke
470 * the teardown callback
471 * @state: The state from which the instance is removed
472 * @node: The node for this individual state.
473 *
474 * Removes the instance and invokes the teardown callback on the online cpus
475 * which have already reached @state.
476 */
cpuhp_state_remove_instance(enum cpuhp_state state,struct hlist_node * node)477 static inline int cpuhp_state_remove_instance(enum cpuhp_state state,
478 struct hlist_node *node)
479 {
480 return __cpuhp_state_remove_instance(state, node, true);
481 }
482
483 /**
484 * cpuhp_state_remove_instance_nocalls - Remove hotplug instance from state
485 * without invoking the teardown callback
486 * @state: The state from which the instance is removed
487 * @node: The node for this individual state.
488 *
489 * Removes the instance without invoking the teardown callback.
490 */
cpuhp_state_remove_instance_nocalls(enum cpuhp_state state,struct hlist_node * node)491 static inline int cpuhp_state_remove_instance_nocalls(enum cpuhp_state state,
492 struct hlist_node *node)
493 {
494 return __cpuhp_state_remove_instance(state, node, false);
495 }
496
497 #ifdef CONFIG_SMP
498 void cpuhp_online_idle(enum cpuhp_state state);
499 #else
cpuhp_online_idle(enum cpuhp_state state)500 static inline void cpuhp_online_idle(enum cpuhp_state state) { }
501 #endif
502
503 struct task_struct;
504
505 void cpuhp_ap_sync_alive(void);
506 void arch_cpuhp_sync_state_poll(void);
507 void arch_cpuhp_cleanup_kick_cpu(unsigned int cpu);
508 int arch_cpuhp_kick_ap_alive(unsigned int cpu, struct task_struct *tidle);
509 bool arch_cpuhp_init_parallel_bringup(void);
510
511 #ifdef CONFIG_HOTPLUG_CORE_SYNC_DEAD
512 void cpuhp_ap_report_dead(void);
513 void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu);
514 #else
cpuhp_ap_report_dead(void)515 static inline void cpuhp_ap_report_dead(void) { }
arch_cpuhp_cleanup_dead_cpu(unsigned int cpu)516 static inline void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu) { }
517 #endif
518
519 #endif
520