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_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_MCE_DEAD,
70  	CPUHP_VIRT_NET_DEAD,
71  	CPUHP_IBMVNIC_DEAD,
72  	CPUHP_SLUB_DEAD,
73  	CPUHP_DEBUG_OBJ_DEAD,
74  	CPUHP_MM_WRITEBACK_DEAD,
75  	CPUHP_MM_VMSTAT_DEAD,
76  	CPUHP_SOFTIRQ_DEAD,
77  	CPUHP_NET_MVNETA_DEAD,
78  	CPUHP_CPUIDLE_DEAD,
79  	CPUHP_ARM64_FPSIMD_DEAD,
80  	CPUHP_ARM_OMAP_WAKE_DEAD,
81  	CPUHP_IRQ_POLL_DEAD,
82  	CPUHP_BLOCK_SOFTIRQ_DEAD,
83  	CPUHP_BIO_DEAD,
84  	CPUHP_ACPI_CPUDRV_DEAD,
85  	CPUHP_S390_PFAULT_DEAD,
86  	CPUHP_BLK_MQ_DEAD,
87  	CPUHP_FS_BUFF_DEAD,
88  	CPUHP_PRINTK_DEAD,
89  	CPUHP_MM_MEMCQ_DEAD,
90  	CPUHP_PERCPU_CNT_DEAD,
91  	CPUHP_RADIX_DEAD,
92  	CPUHP_PAGE_ALLOC,
93  	CPUHP_NET_DEV_DEAD,
94  	CPUHP_PCI_XGENE_DEAD,
95  	CPUHP_IOMMU_IOVA_DEAD,
96  	CPUHP_AP_ARM_CACHE_B15_RAC_DEAD,
97  	CPUHP_PADATA_DEAD,
98  	CPUHP_AP_DTPM_CPU_DEAD,
99  	CPUHP_RANDOM_PREPARE,
100  	CPUHP_WORKQUEUE_PREP,
101  	CPUHP_POWER_NUMA_PREPARE,
102  	CPUHP_HRTIMERS_PREPARE,
103  	CPUHP_X2APIC_PREPARE,
104  	CPUHP_SMPCFD_PREPARE,
105  	CPUHP_RELAY_PREPARE,
106  	CPUHP_MD_RAID5_PREPARE,
107  	CPUHP_RCUTREE_PREP,
108  	CPUHP_CPUIDLE_COUPLED_PREPARE,
109  	CPUHP_POWERPC_PMAC_PREPARE,
110  	CPUHP_POWERPC_MMU_CTX_PREPARE,
111  	CPUHP_XEN_PREPARE,
112  	CPUHP_XEN_EVTCHN_PREPARE,
113  	CPUHP_ARM_SHMOBILE_SCU_PREPARE,
114  	CPUHP_SH_SH3X_PREPARE,
115  	CPUHP_TOPOLOGY_PREPARE,
116  	CPUHP_NET_IUCV_PREPARE,
117  	CPUHP_ARM_BL_PREPARE,
118  	CPUHP_TRACE_RB_PREPARE,
119  	CPUHP_MM_ZS_PREPARE,
120  	CPUHP_MM_ZSWP_POOL_PREPARE,
121  	CPUHP_KVM_PPC_BOOK3S_PREPARE,
122  	CPUHP_ZCOMP_PREPARE,
123  	CPUHP_TIMERS_PREPARE,
124  	CPUHP_TMIGR_PREPARE,
125  	CPUHP_MIPS_SOC_PREPARE,
126  	CPUHP_BP_PREPARE_DYN,
127  	CPUHP_BP_PREPARE_DYN_END		= CPUHP_BP_PREPARE_DYN + 20,
128  	CPUHP_BP_KICK_AP,
129  	CPUHP_BRINGUP_CPU,
130  
131  	/*
132  	 * STARTING section invoked on the hotplugged CPU in low level
133  	 * bringup and teardown code.
134  	 */
135  	CPUHP_AP_IDLE_DEAD,
136  	CPUHP_AP_OFFLINE,
137  	CPUHP_AP_CACHECTRL_STARTING,
138  	CPUHP_AP_SCHED_STARTING,
139  	CPUHP_AP_RCUTREE_DYING,
140  	CPUHP_AP_CPU_PM_STARTING,
141  	CPUHP_AP_IRQ_GIC_STARTING,
142  	CPUHP_AP_IRQ_HIP04_STARTING,
143  	CPUHP_AP_IRQ_APPLE_AIC_STARTING,
144  	CPUHP_AP_IRQ_ARMADA_XP_STARTING,
145  	CPUHP_AP_IRQ_BCM2836_STARTING,
146  	CPUHP_AP_IRQ_MIPS_GIC_STARTING,
147  	CPUHP_AP_IRQ_EIOINTC_STARTING,
148  	CPUHP_AP_IRQ_AVECINTC_STARTING,
149  	CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
150  	CPUHP_AP_IRQ_RISCV_IMSIC_STARTING,
151  	CPUHP_AP_IRQ_RISCV_SBI_IPI_STARTING,
152  	CPUHP_AP_ARM_MVEBU_COHERENCY,
153  	CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING,
154  	CPUHP_AP_PERF_X86_STARTING,
155  	CPUHP_AP_PERF_X86_AMD_IBS_STARTING,
156  	CPUHP_AP_PERF_XTENSA_STARTING,
157  	CPUHP_AP_ARM_VFP_STARTING,
158  	CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING,
159  	CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING,
160  	CPUHP_AP_PERF_ARM_ACPI_STARTING,
161  	CPUHP_AP_PERF_ARM_STARTING,
162  	CPUHP_AP_PERF_RISCV_STARTING,
163  	CPUHP_AP_ARM_L2X0_STARTING,
164  	CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
165  	CPUHP_AP_ARM_ARCH_TIMER_STARTING,
166  	CPUHP_AP_ARM_ARCH_TIMER_EVTSTRM_STARTING,
167  	CPUHP_AP_ARM_GLOBAL_TIMER_STARTING,
168  	CPUHP_AP_JCORE_TIMER_STARTING,
169  	CPUHP_AP_ARM_TWD_STARTING,
170  	CPUHP_AP_QCOM_TIMER_STARTING,
171  	CPUHP_AP_TEGRA_TIMER_STARTING,
172  	CPUHP_AP_ARMADA_TIMER_STARTING,
173  	CPUHP_AP_MIPS_GIC_TIMER_STARTING,
174  	CPUHP_AP_ARC_TIMER_STARTING,
175  	CPUHP_AP_REALTEK_TIMER_STARTING,
176  	CPUHP_AP_RISCV_TIMER_STARTING,
177  	CPUHP_AP_CLINT_TIMER_STARTING,
178  	CPUHP_AP_CSKY_TIMER_STARTING,
179  	CPUHP_AP_TI_GP_TIMER_STARTING,
180  	CPUHP_AP_HYPERV_TIMER_STARTING,
181  	/* Must be the last timer callback */
182  	CPUHP_AP_DUMMY_TIMER_STARTING,
183  	CPUHP_AP_ARM_XEN_STARTING,
184  	CPUHP_AP_ARM_XEN_RUNSTATE_STARTING,
185  	CPUHP_AP_ARM_CORESIGHT_STARTING,
186  	CPUHP_AP_ARM_CORESIGHT_CTI_STARTING,
187  	CPUHP_AP_ARM64_ISNDEP_STARTING,
188  	CPUHP_AP_SMPCFD_DYING,
189  	CPUHP_AP_HRTIMERS_DYING,
190  	CPUHP_AP_TICK_DYING,
191  	CPUHP_AP_X86_TBOOT_DYING,
192  	CPUHP_AP_ARM_CACHE_B15_RAC_DYING,
193  	CPUHP_AP_ONLINE,
194  	CPUHP_TEARDOWN_CPU,
195  
196  	/* Online section invoked on the hotplugged CPU from the hotplug thread */
197  	CPUHP_AP_ONLINE_IDLE,
198  	CPUHP_AP_HYPERV_ONLINE,
199  	CPUHP_AP_KVM_ONLINE,
200  	CPUHP_AP_SCHED_WAIT_EMPTY,
201  	CPUHP_AP_SMPBOOT_THREADS,
202  	CPUHP_AP_IRQ_AFFINITY_ONLINE,
203  	CPUHP_AP_BLK_MQ_ONLINE,
204  	CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS,
205  	CPUHP_AP_X86_INTEL_EPB_ONLINE,
206  	CPUHP_AP_PERF_ONLINE,
207  	CPUHP_AP_PERF_X86_ONLINE,
208  	CPUHP_AP_PERF_X86_UNCORE_ONLINE,
209  	CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE,
210  	CPUHP_AP_PERF_X86_AMD_POWER_ONLINE,
211  	CPUHP_AP_PERF_X86_RAPL_ONLINE,
212  	CPUHP_AP_PERF_S390_CF_ONLINE,
213  	CPUHP_AP_PERF_S390_SF_ONLINE,
214  	CPUHP_AP_PERF_ARM_CCI_ONLINE,
215  	CPUHP_AP_PERF_ARM_CCN_ONLINE,
216  	CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE,
217  	CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
218  	CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE,
219  	CPUHP_AP_PERF_ARM_HISI_L3_ONLINE,
220  	CPUHP_AP_PERF_ARM_HISI_PA_ONLINE,
221  	CPUHP_AP_PERF_ARM_HISI_SLLC_ONLINE,
222  	CPUHP_AP_PERF_ARM_HISI_PCIE_PMU_ONLINE,
223  	CPUHP_AP_PERF_ARM_HNS3_PMU_ONLINE,
224  	CPUHP_AP_PERF_ARM_L2X0_ONLINE,
225  	CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
226  	CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE,
227  	CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE,
228  	CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
229  	CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE,
230  	CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE,
231  	CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE,
232  	CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE,
233  	CPUHP_AP_PERF_POWERPC_TRACE_IMC_ONLINE,
234  	CPUHP_AP_PERF_POWERPC_HV_24x7_ONLINE,
235  	CPUHP_AP_PERF_POWERPC_HV_GPCI_ONLINE,
236  	CPUHP_AP_PERF_CSKY_ONLINE,
237  	CPUHP_AP_TMIGR_ONLINE,
238  	CPUHP_AP_WATCHDOG_ONLINE,
239  	CPUHP_AP_WORKQUEUE_ONLINE,
240  	CPUHP_AP_RANDOM_ONLINE,
241  	CPUHP_AP_RCUTREE_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  
251  int __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  
255  int __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   */
cpuhp_setup_state(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))271  static 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   */
cpuhp_setup_state_cpuslocked(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))291  static 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   */
cpuhp_setup_state_nocalls(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))311  static 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   */
cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state,const char * name,int (* startup)(unsigned int cpu),int (* teardown)(unsigned int cpu))333  static 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   */
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))354  static 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  
366  int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node,
367  			       bool invoke);
368  int __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   */
cpuhp_state_add_instance(enum cpuhp_state state,struct hlist_node * node)382  static 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   */
cpuhp_state_add_instance_nocalls(enum cpuhp_state state,struct hlist_node * node)398  static 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   */
415  static inline int
cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state,struct hlist_node * node)416  cpuhp_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  
422  void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);
423  void __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   */
cpuhp_remove_state(enum cpuhp_state state)432  static 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   */
cpuhp_remove_state_nocalls(enum cpuhp_state state)442  static 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   */
cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state)455  static 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   */
cpuhp_remove_multi_state(enum cpuhp_state state)468  static inline void cpuhp_remove_multi_state(enum cpuhp_state state)
469  {
470  	__cpuhp_remove_state(state, false);
471  }
472  
473  int __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   */
cpuhp_state_remove_instance(enum cpuhp_state state,struct hlist_node * node)485  static 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   */
cpuhp_state_remove_instance_nocalls(enum cpuhp_state state,struct hlist_node * node)499  static 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
506  void cpuhp_online_idle(enum cpuhp_state state);
507  #else
cpuhp_online_idle(enum cpuhp_state state)508  static inline void cpuhp_online_idle(enum cpuhp_state state) { }
509  #endif
510  
511  struct task_struct;
512  
513  void cpuhp_ap_sync_alive(void);
514  void arch_cpuhp_sync_state_poll(void);
515  void arch_cpuhp_cleanup_kick_cpu(unsigned int cpu);
516  int arch_cpuhp_kick_ap_alive(unsigned int cpu, struct task_struct *tidle);
517  bool arch_cpuhp_init_parallel_bringup(void);
518  
519  #ifdef CONFIG_HOTPLUG_CORE_SYNC_DEAD
520  void cpuhp_ap_report_dead(void);
521  void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu);
522  #else
cpuhp_ap_report_dead(void)523  static inline void cpuhp_ap_report_dead(void) { }
arch_cpuhp_cleanup_dead_cpu(unsigned int cpu)524  static inline void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu) { }
525  #endif
526  
527  #endif
528