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_GLOBAL_TIMER_STARTING,
176 CPUHP_AP_JCORE_TIMER_STARTING,
177 CPUHP_AP_ARM_TWD_STARTING,
178 CPUHP_AP_QCOM_TIMER_STARTING,
179 CPUHP_AP_TEGRA_TIMER_STARTING,
180 CPUHP_AP_ARMADA_TIMER_STARTING,
181 CPUHP_AP_MARCO_TIMER_STARTING,
182 CPUHP_AP_MIPS_GIC_TIMER_STARTING,
183 CPUHP_AP_ARC_TIMER_STARTING,
184 CPUHP_AP_RISCV_TIMER_STARTING,
185 CPUHP_AP_CLINT_TIMER_STARTING,
186 CPUHP_AP_CSKY_TIMER_STARTING,
187 CPUHP_AP_TI_GP_TIMER_STARTING,
188 CPUHP_AP_HYPERV_TIMER_STARTING,
189 /* Must be the last timer callback */
190 CPUHP_AP_DUMMY_TIMER_STARTING,
191 CPUHP_AP_ARM_XEN_STARTING,
192 CPUHP_AP_ARM_XEN_RUNSTATE_STARTING,
193 CPUHP_AP_ARM_CORESIGHT_STARTING,
194 CPUHP_AP_ARM_CORESIGHT_CTI_STARTING,
195 CPUHP_AP_ARM64_ISNDEP_STARTING,
196 CPUHP_AP_SMPCFD_DYING,
197 CPUHP_AP_HRTIMERS_DYING,
198 CPUHP_AP_X86_TBOOT_DYING,
199 CPUHP_AP_ARM_CACHE_B15_RAC_DYING,
200 CPUHP_AP_ONLINE,
201 CPUHP_TEARDOWN_CPU,
202
203 /* Online section invoked on the hotplugged CPU from the hotplug thread */
204 CPUHP_AP_ONLINE_IDLE,
205 CPUHP_AP_HYPERV_ONLINE,
206 CPUHP_AP_KVM_ONLINE,
207 CPUHP_AP_SCHED_WAIT_EMPTY,
208 CPUHP_AP_SMPBOOT_THREADS,
209 CPUHP_AP_X86_VDSO_VMA_ONLINE,
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 */
cpuhp_setup_state(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))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 */
cpuhp_setup_state_cpuslocked(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))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 */
cpuhp_setup_state_nocalls(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))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 */
cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))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 */
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))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 */
cpuhp_state_add_instance(enum cpuhp_state state,struct hlist_node * node)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 */
cpuhp_state_add_instance_nocalls(enum cpuhp_state state,struct hlist_node * node)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
cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state,struct hlist_node * node)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 */
cpuhp_remove_state(enum cpuhp_state state)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 */
cpuhp_remove_state_nocalls(enum cpuhp_state state)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 */
cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state)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 */
cpuhp_remove_multi_state(enum cpuhp_state state)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 */
cpuhp_state_remove_instance(enum cpuhp_state state,struct hlist_node * node)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 */
cpuhp_state_remove_instance_nocalls(enum cpuhp_state state,struct hlist_node * node)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
cpuhp_online_idle(enum cpuhp_state state)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
cpuhp_ap_report_dead(void)535 static inline void cpuhp_ap_report_dead(void) { }
arch_cpuhp_cleanup_dead_cpu(unsigned int cpu)536 static inline void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu) { }
537 #endif
538
539 #endif
540