[thirdparty/kernel/stable.git] / include / linux / cpuhotplug.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __CPUHOTPLUG_H
#define __CPUHOTPLUG_H

#include <linux/types.h>

/*
 * CPU-up			CPU-down
 *
 * BP		AP		BP		AP
 *
 * OFFLINE			OFFLINE
 *   |				  ^
 *   v				  |
 * BRINGUP_CPU->AP_OFFLINE	BRINGUP_CPU  <- AP_IDLE_DEAD (idle thread/play_dead)
 *		  |				AP_OFFLINE
 *		  v (IRQ-off)	  ,---------------^
 *		AP_ONLNE	  | (stop_machine)
 *		  |		TEARDOWN_CPU <-	AP_ONLINE_IDLE
 *		  |				  ^
 *		  v				  |
 *              AP_ACTIVE			AP_ACTIVE
 */

/*
 * CPU hotplug states. The state machine invokes the installed state
 * startup callbacks sequentially from CPUHP_OFFLINE + 1 to CPUHP_ONLINE
 * during a CPU online operation. During a CPU offline operation the
 * installed teardown callbacks are invoked in the reverse order from
 * CPUHP_ONLINE - 1 down to CPUHP_OFFLINE.
 *
 * The state space has three sections: PREPARE, STARTING and ONLINE.
 *
 * PREPARE: The callbacks are invoked on a control CPU before the
 * hotplugged CPU is started up or after the hotplugged CPU has died.
 *
 * STARTING: The callbacks are invoked on the hotplugged CPU from the low level
 * hotplug startup/teardown code with interrupts disabled.
 *
 * ONLINE: The callbacks are invoked on the hotplugged CPU from the per CPU
 * hotplug thread with interrupts and preemption enabled.
 *
 * Adding explicit states to this enum is only necessary when:
 *
 * 1) The state is within the STARTING section
 *
 * 2) The state has ordering constraints vs. other states in the
 *    same section.
 *
 * If neither #1 nor #2 apply, please use the dynamic state space when
 * setting up a state by using CPUHP_BP_PREPARE_DYN or CPUHP_AP_ONLINE_DYN
 * for the @state argument of the setup function.
 *
 * See Documentation/core-api/cpu_hotplug.rst for further information and
 * examples.
 */
enum cpuhp_state {
	CPUHP_INVALID = -1,

	/* PREPARE section invoked on a control CPU */
	CPUHP_OFFLINE = 0,
	CPUHP_CREATE_THREADS,
	CPUHP_PERF_X86_PREPARE,
	CPUHP_PERF_X86_AMD_UNCORE_PREP,
	CPUHP_PERF_POWER,
	CPUHP_PERF_SUPERH,
	CPUHP_X86_HPET_DEAD,
	CPUHP_X86_MCE_DEAD,
	CPUHP_VIRT_NET_DEAD,
	CPUHP_IBMVNIC_DEAD,
	CPUHP_SLUB_DEAD,
	CPUHP_DEBUG_OBJ_DEAD,
	CPUHP_MM_WRITEBACK_DEAD,
	CPUHP_MM_VMSTAT_DEAD,
	CPUHP_SOFTIRQ_DEAD,
	CPUHP_NET_MVNETA_DEAD,
	CPUHP_CPUIDLE_DEAD,
	CPUHP_ARM64_FPSIMD_DEAD,
	CPUHP_ARM_OMAP_WAKE_DEAD,
	CPUHP_IRQ_POLL_DEAD,
	CPUHP_BLOCK_SOFTIRQ_DEAD,
	CPUHP_BIO_DEAD,
	CPUHP_ACPI_CPUDRV_DEAD,
	CPUHP_S390_PFAULT_DEAD,
	CPUHP_BLK_MQ_DEAD,
	CPUHP_FS_BUFF_DEAD,
	CPUHP_PRINTK_DEAD,
	CPUHP_MM_MEMCQ_DEAD,
	CPUHP_PERCPU_CNT_DEAD,
	CPUHP_RADIX_DEAD,
	CPUHP_PAGE_ALLOC,
	CPUHP_NET_DEV_DEAD,
	CPUHP_PCI_XGENE_DEAD,
	CPUHP_IOMMU_IOVA_DEAD,
	CPUHP_AP_ARM_CACHE_B15_RAC_DEAD,
	CPUHP_PADATA_DEAD,
	CPUHP_AP_DTPM_CPU_DEAD,
	CPUHP_RANDOM_PREPARE,
	CPUHP_WORKQUEUE_PREP,
	CPUHP_POWER_NUMA_PREPARE,
	CPUHP_HRTIMERS_PREPARE,
	CPUHP_X2APIC_PREPARE,
	CPUHP_SMPCFD_PREPARE,
	CPUHP_RELAY_PREPARE,
	CPUHP_MD_RAID5_PREPARE,
	CPUHP_RCUTREE_PREP,
	CPUHP_CPUIDLE_COUPLED_PREPARE,
	CPUHP_POWERPC_PMAC_PREPARE,
	CPUHP_POWERPC_MMU_CTX_PREPARE,
	CPUHP_XEN_PREPARE,
	CPUHP_XEN_EVTCHN_PREPARE,
	CPUHP_ARM_SHMOBILE_SCU_PREPARE,
	CPUHP_SH_SH3X_PREPARE,
	CPUHP_TOPOLOGY_PREPARE,
	CPUHP_NET_IUCV_PREPARE,
	CPUHP_ARM_BL_PREPARE,
	CPUHP_TRACE_RB_PREPARE,
	CPUHP_MM_ZSWP_POOL_PREPARE,
	CPUHP_KVM_PPC_BOOK3S_PREPARE,
	CPUHP_ZCOMP_PREPARE,
	CPUHP_TIMERS_PREPARE,
	CPUHP_TMIGR_PREPARE,
	CPUHP_MIPS_SOC_PREPARE,
	CPUHP_BP_PREPARE_DYN,
	CPUHP_BP_PREPARE_DYN_END		= CPUHP_BP_PREPARE_DYN + 20,
	CPUHP_BP_KICK_AP,
	CPUHP_BRINGUP_CPU,

	/*
	 * STARTING section invoked on the hotplugged CPU in low level
	 * bringup and teardown code.
	 */
	CPUHP_AP_IDLE_DEAD,
	CPUHP_AP_OFFLINE,
	CPUHP_AP_CACHECTRL_STARTING,
	CPUHP_AP_SCHED_STARTING,
	CPUHP_AP_RCUTREE_DYING,
	CPUHP_AP_CPU_PM_STARTING,
	CPUHP_AP_IRQ_GIC_STARTING,
	CPUHP_AP_IRQ_HIP04_STARTING,
	CPUHP_AP_IRQ_APPLE_AIC_STARTING,
	CPUHP_AP_IRQ_ARMADA_XP_STARTING,
	CPUHP_AP_IRQ_BCM2836_STARTING,
	CPUHP_AP_IRQ_MIPS_GIC_STARTING,
	CPUHP_AP_IRQ_EIOINTC_STARTING,
	CPUHP_AP_IRQ_AVECINTC_STARTING,
	CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
	CPUHP_AP_IRQ_THEAD_ACLINT_SSWI_STARTING,
	CPUHP_AP_IRQ_RISCV_IMSIC_STARTING,
	CPUHP_AP_IRQ_RISCV_SBI_IPI_STARTING,
	CPUHP_AP_ARM_MVEBU_COHERENCY,
	CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING,
	CPUHP_AP_PERF_X86_STARTING,
	CPUHP_AP_PERF_X86_AMD_IBS_STARTING,
	CPUHP_AP_PERF_XTENSA_STARTING,
	CPUHP_AP_ARM_VFP_STARTING,
	CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING,
	CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING,
	CPUHP_AP_PERF_ARM_ACPI_STARTING,
	CPUHP_AP_PERF_ARM_STARTING,
	CPUHP_AP_PERF_RISCV_STARTING,
	CPUHP_AP_ARM_L2X0_STARTING,
	CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
	CPUHP_AP_ARM_ARCH_TIMER_STARTING,
	CPUHP_AP_ARM_ARCH_TIMER_EVTSTRM_STARTING,
	CPUHP_AP_ARM_GLOBAL_TIMER_STARTING,
	CPUHP_AP_JCORE_TIMER_STARTING,
	CPUHP_AP_ARM_TWD_STARTING,
	CPUHP_AP_QCOM_TIMER_STARTING,
	CPUHP_AP_TEGRA_TIMER_STARTING,
	CPUHP_AP_ARMADA_TIMER_STARTING,
	CPUHP_AP_MIPS_GIC_TIMER_STARTING,
	CPUHP_AP_ARC_TIMER_STARTING,
	CPUHP_AP_REALTEK_TIMER_STARTING,
	CPUHP_AP_RISCV_TIMER_STARTING,
	CPUHP_AP_CLINT_TIMER_STARTING,
	CPUHP_AP_CSKY_TIMER_STARTING,
	CPUHP_AP_TI_GP_TIMER_STARTING,
	CPUHP_AP_HYPERV_TIMER_STARTING,
	/* Must be the last timer callback */
	CPUHP_AP_DUMMY_TIMER_STARTING,
	CPUHP_AP_ARM_XEN_STARTING,
	CPUHP_AP_ARM_XEN_RUNSTATE_STARTING,
	CPUHP_AP_ARM_CORESIGHT_STARTING,
	CPUHP_AP_ARM_CORESIGHT_CTI_STARTING,
	CPUHP_AP_ARM64_ISNDEP_STARTING,
	CPUHP_AP_SMPCFD_DYING,
	CPUHP_AP_HRTIMERS_DYING,
	CPUHP_AP_TICK_DYING,
	CPUHP_AP_X86_TBOOT_DYING,
	CPUHP_AP_ARM_CACHE_B15_RAC_DYING,
	CPUHP_AP_ONLINE,
	CPUHP_TEARDOWN_CPU,

	/* Online section invoked on the hotplugged CPU from the hotplug thread */
	CPUHP_AP_ONLINE_IDLE,
	CPUHP_AP_HYPERV_ONLINE,
	CPUHP_AP_KVM_ONLINE,
	CPUHP_AP_SCHED_WAIT_EMPTY,
	CPUHP_AP_SMPBOOT_THREADS,
	CPUHP_AP_IRQ_AFFINITY_ONLINE,
	CPUHP_AP_BLK_MQ_ONLINE,
	CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS,
	CPUHP_AP_X86_INTEL_EPB_ONLINE,
	CPUHP_AP_PERF_ONLINE,
	CPUHP_AP_PERF_X86_ONLINE,
	CPUHP_AP_PERF_X86_UNCORE_ONLINE,
	CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE,
	CPUHP_AP_PERF_X86_AMD_POWER_ONLINE,
	CPUHP_AP_PERF_S390_CF_ONLINE,
	CPUHP_AP_PERF_S390_SF_ONLINE,
	CPUHP_AP_PERF_ARM_CCI_ONLINE,
	CPUHP_AP_PERF_ARM_CCN_ONLINE,
	CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE,
	CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
	CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE,
	CPUHP_AP_PERF_ARM_HISI_L3_ONLINE,
	CPUHP_AP_PERF_ARM_HISI_PA_ONLINE,
	CPUHP_AP_PERF_ARM_HISI_SLLC_ONLINE,
	CPUHP_AP_PERF_ARM_HISI_PCIE_PMU_ONLINE,
	CPUHP_AP_PERF_ARM_HNS3_PMU_ONLINE,
	CPUHP_AP_PERF_ARM_L2X0_ONLINE,
	CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
	CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE,
	CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE,
	CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
	CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE,
	CPUHP_AP_PERF_ARM_MRVL_PEM_ONLINE,
	CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE,
	CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE,
	CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE,
	CPUHP_AP_PERF_POWERPC_TRACE_IMC_ONLINE,
	CPUHP_AP_PERF_POWERPC_HV_24x7_ONLINE,
	CPUHP_AP_PERF_POWERPC_HV_GPCI_ONLINE,
	CPUHP_AP_PERF_CSKY_ONLINE,
	CPUHP_AP_TMIGR_ONLINE,
	CPUHP_AP_WATCHDOG_ONLINE,
	CPUHP_AP_WORKQUEUE_ONLINE,
	CPUHP_AP_RANDOM_ONLINE,
	CPUHP_AP_RCUTREE_ONLINE,
	CPUHP_AP_KTHREADS_ONLINE,
	CPUHP_AP_BASE_CACHEINFO_ONLINE,
	CPUHP_AP_ONLINE_DYN,
	CPUHP_AP_ONLINE_DYN_END		= CPUHP_AP_ONLINE_DYN + 40,
	CPUHP_AP_X86_HPET_ONLINE,
	CPUHP_AP_X86_KVM_CLK_ONLINE,
	CPUHP_AP_ACTIVE,
	CPUHP_ONLINE,
};

int __cpuhp_setup_state(enum cpuhp_state state,	const char *name, bool invoke,
			int (*startup)(unsigned int cpu),
			int (*teardown)(unsigned int cpu), bool multi_instance);

int __cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name,
				   bool invoke,
				   int (*startup)(unsigned int cpu),
				   int (*teardown)(unsigned int cpu),
				   bool multi_instance);
/**
 * cpuhp_setup_state - Setup hotplug state callbacks with calling the @startup
 *                     callback
 * @state:	The state for which the calls are installed
 * @name:	Name of the callback (will be used in debug output)
 * @startup:	startup callback function or NULL if not required
 * @teardown:	teardown callback function or NULL if not required
 *
 * Installs the callback functions and invokes the @startup callback on
 * the online cpus which have already reached the @state.
 */
static inline int cpuhp_setup_state(enum cpuhp_state state,
				    const char *name,
				    int (*startup)(unsigned int cpu),
				    int (*teardown)(unsigned int cpu))
{
	return __cpuhp_setup_state(state, name, true, startup, teardown, false);
}

/**
 * cpuhp_setup_state_cpuslocked - Setup hotplug state callbacks with calling
 *				  @startup callback from a cpus_read_lock()
 *				  held region
 * @state:	The state for which the calls are installed
 * @name:	Name of the callback (will be used in debug output)
 * @startup:	startup callback function or NULL if not required
 * @teardown:	teardown callback function or NULL if not required
 *
 * Same as cpuhp_setup_state() except that it must be invoked from within a
 * cpus_read_lock() held region.
 */
static inline int cpuhp_setup_state_cpuslocked(enum cpuhp_state state,
					       const char *name,
					       int (*startup)(unsigned int cpu),
					       int (*teardown)(unsigned int cpu))
{
	return __cpuhp_setup_state_cpuslocked(state, name, true, startup,
					      teardown, false);
}

/**
 * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the
 *			       @startup callback
 * @state:	The state for which the calls are installed
 * @name:	Name of the callback.
 * @startup:	startup callback function or NULL if not required
 * @teardown:	teardown callback function or NULL if not required
 *
 * Same as cpuhp_setup_state() except that the @startup callback is not
 * invoked during installation. NOP if SMP=n or HOTPLUG_CPU=n.
 */
static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state,
					    const char *name,
					    int (*startup)(unsigned int cpu),
					    int (*teardown)(unsigned int cpu))
{
	return __cpuhp_setup_state(state, name, false, startup, teardown,
				   false);
}

/**
 * cpuhp_setup_state_nocalls_cpuslocked - Setup hotplug state callbacks without
 *					  invoking the @startup callback from
 *					  a cpus_read_lock() held region
 *			       callbacks
 * @state:	The state for which the calls are installed
 * @name:	Name of the callback.
 * @startup:	startup callback function or NULL if not required
 * @teardown:	teardown callback function or NULL if not required
 *
 * Same as cpuhp_setup_state_nocalls() except that it must be invoked from
 * within a cpus_read_lock() held region.
 */
static inline int cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state,
						     const char *name,
						     int (*startup)(unsigned int cpu),
						     int (*teardown)(unsigned int cpu))
{
	return __cpuhp_setup_state_cpuslocked(state, name, false, startup,
					    teardown, false);
}

/**
 * cpuhp_setup_state_multi - Add callbacks for multi state
 * @state:	The state for which the calls are installed
 * @name:	Name of the callback.
 * @startup:	startup callback function or NULL if not required
 * @teardown:	teardown callback function or NULL if not required
 *
 * Sets the internal multi_instance flag and prepares a state to work as a multi
 * instance callback. No callbacks are invoked at this point. The callbacks are
 * invoked once an instance for this state are registered via
 * cpuhp_state_add_instance() or cpuhp_state_add_instance_nocalls()
 */
static inline int 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))
{
	return __cpuhp_setup_state(state, name, false,
				   (void *) startup,
				   (void *) teardown, true);
}

int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node,
			       bool invoke);
int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state,
					  struct hlist_node *node, bool invoke);

/**
 * cpuhp_state_add_instance - Add an instance for a state and invoke startup
 *                            callback.
 * @state:	The state for which the instance is installed
 * @node:	The node for this individual state.
 *
 * Installs the instance for the @state and invokes the registered startup
 * callback on the online cpus which have already reached the @state. The
 * @state must have been earlier marked as multi-instance by
 * cpuhp_setup_state_multi().
 */
static inline int cpuhp_state_add_instance(enum cpuhp_state state,
					   struct hlist_node *node)
{
	return __cpuhp_state_add_instance(state, node, true);
}

/**
 * cpuhp_state_add_instance_nocalls - Add an instance for a state without
 *                                    invoking the startup callback.
 * @state:	The state for which the instance is installed
 * @node:	The node for this individual state.
 *
 * Installs the instance for the @state. The @state must have been earlier
 * marked as multi-instance by cpuhp_setup_state_multi. NOP if SMP=n or
 * HOTPLUG_CPU=n.
 */
static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state,
						   struct hlist_node *node)
{
	return __cpuhp_state_add_instance(state, node, false);
}

/**
 * cpuhp_state_add_instance_nocalls_cpuslocked - Add an instance for a state
 *						 without invoking the startup
 *						 callback from a cpus_read_lock()
 *						 held region.
 * @state:	The state for which the instance is installed
 * @node:	The node for this individual state.
 *
 * Same as cpuhp_state_add_instance_nocalls() except that it must be
 * invoked from within a cpus_read_lock() held region.
 */
static inline int
cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state,
					    struct hlist_node *node)
{
	return __cpuhp_state_add_instance_cpuslocked(state, node, false);
}

void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);
void __cpuhp_remove_state_cpuslocked(enum cpuhp_state state, bool invoke);

/**
 * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown
 * @state:	The state for which the calls are removed
 *
 * Removes the callback functions and invokes the teardown callback on
 * the online cpus which have already reached the @state.
 */
static inline void cpuhp_remove_state(enum cpuhp_state state)
{
	__cpuhp_remove_state(state, true);
}

/**
 * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking
 *				the teardown callback
 * @state:	The state for which the calls are removed
 */
static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state)
{
	__cpuhp_remove_state(state, false);
}

/**
 * cpuhp_remove_state_nocalls_cpuslocked - Remove hotplug state callbacks without invoking
 *					   teardown from a cpus_read_lock() held region.
 * @state:	The state for which the calls are removed
 *
 * Same as cpuhp_remove_state nocalls() except that it must be invoked
 * from within a cpus_read_lock() held region.
 */
static inline void cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state)
{
	__cpuhp_remove_state_cpuslocked(state, false);
}

/**
 * cpuhp_remove_multi_state - Remove hotplug multi state callback
 * @state:	The state for which the calls are removed
 *
 * Removes the callback functions from a multi state. This is the reverse of
 * cpuhp_setup_state_multi(). All instances should have been removed before
 * invoking this function.
 */
static inline void cpuhp_remove_multi_state(enum cpuhp_state state)
{
	__cpuhp_remove_state(state, false);
}

int __cpuhp_state_remove_instance(enum cpuhp_state state,
				  struct hlist_node *node, bool invoke);

/**
 * cpuhp_state_remove_instance - Remove hotplug instance from state and invoke
 *                               the teardown callback
 * @state:	The state from which the instance is removed
 * @node:	The node for this individual state.
 *
 * Removes the instance and invokes the teardown callback on the online cpus
 * which have already reached @state.
 */
static inline int cpuhp_state_remove_instance(enum cpuhp_state state,
					      struct hlist_node *node)
{
	return __cpuhp_state_remove_instance(state, node, true);
}

/**
 * cpuhp_state_remove_instance_nocalls - Remove hotplug instance from state
 *					 without invoking the teardown callback
 * @state:	The state from which the instance is removed
 * @node:	The node for this individual state.
 *
 * Removes the instance without invoking the teardown callback.
 */
static inline int cpuhp_state_remove_instance_nocalls(enum cpuhp_state state,
						      struct hlist_node *node)
{
	return __cpuhp_state_remove_instance(state, node, false);
}

#ifdef CONFIG_SMP
void cpuhp_online_idle(enum cpuhp_state state);
#else
static inline void cpuhp_online_idle(enum cpuhp_state state) { }
#endif

struct task_struct;

void cpuhp_ap_sync_alive(void);
void arch_cpuhp_sync_state_poll(void);
void arch_cpuhp_cleanup_kick_cpu(unsigned int cpu);
int arch_cpuhp_kick_ap_alive(unsigned int cpu, struct task_struct *tidle);
bool arch_cpuhp_init_parallel_bringup(void);

#ifdef CONFIG_HOTPLUG_CORE_SYNC_DEAD
void cpuhp_ap_report_dead(void);
void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu);
#else
static inline void cpuhp_ap_report_dead(void) { }
static inline void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu) { }
#endif

#endif
Commit	Line	Data
	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_PCI_XGENE_DEAD,
	94	CPUHP_IOMMU_IOVA_DEAD,
	95	CPUHP_AP_ARM_CACHE_B15_RAC_DEAD,
	96	CPUHP_PADATA_DEAD,
	97	CPUHP_AP_DTPM_CPU_DEAD,
	98	CPUHP_RANDOM_PREPARE,
	99	CPUHP_WORKQUEUE_PREP,
	100	CPUHP_POWER_NUMA_PREPARE,
	101	CPUHP_HRTIMERS_PREPARE,
	102	CPUHP_X2APIC_PREPARE,
	103	CPUHP_SMPCFD_PREPARE,
	104	CPUHP_RELAY_PREPARE,
	105	CPUHP_MD_RAID5_PREPARE,
	106	CPUHP_RCUTREE_PREP,
	107	CPUHP_CPUIDLE_COUPLED_PREPARE,
	108	CPUHP_POWERPC_PMAC_PREPARE,
	109	CPUHP_POWERPC_MMU_CTX_PREPARE,
	110	CPUHP_XEN_PREPARE,
	111	CPUHP_XEN_EVTCHN_PREPARE,
	112	CPUHP_ARM_SHMOBILE_SCU_PREPARE,
	113	CPUHP_SH_SH3X_PREPARE,
	114	CPUHP_TOPOLOGY_PREPARE,
	115	CPUHP_NET_IUCV_PREPARE,
	116	CPUHP_ARM_BL_PREPARE,
	117	CPUHP_TRACE_RB_PREPARE,
	118	CPUHP_MM_ZSWP_POOL_PREPARE,
	119	CPUHP_KVM_PPC_BOOK3S_PREPARE,
	120	CPUHP_ZCOMP_PREPARE,
	121	CPUHP_TIMERS_PREPARE,
	122	CPUHP_TMIGR_PREPARE,
	123	CPUHP_MIPS_SOC_PREPARE,
	124	CPUHP_BP_PREPARE_DYN,
	125	CPUHP_BP_PREPARE_DYN_END = CPUHP_BP_PREPARE_DYN + 20,
	126	CPUHP_BP_KICK_AP,
	127	CPUHP_BRINGUP_CPU,
	128
	129	/*
	130	* STARTING section invoked on the hotplugged CPU in low level
	131	* bringup and teardown code.
	132	*/
	133	CPUHP_AP_IDLE_DEAD,
	134	CPUHP_AP_OFFLINE,
	135	CPUHP_AP_CACHECTRL_STARTING,
	136	CPUHP_AP_SCHED_STARTING,
	137	CPUHP_AP_RCUTREE_DYING,
	138	CPUHP_AP_CPU_PM_STARTING,
	139	CPUHP_AP_IRQ_GIC_STARTING,
	140	CPUHP_AP_IRQ_HIP04_STARTING,
	141	CPUHP_AP_IRQ_APPLE_AIC_STARTING,
	142	CPUHP_AP_IRQ_ARMADA_XP_STARTING,
	143	CPUHP_AP_IRQ_BCM2836_STARTING,
	144	CPUHP_AP_IRQ_MIPS_GIC_STARTING,
	145	CPUHP_AP_IRQ_EIOINTC_STARTING,
	146	CPUHP_AP_IRQ_AVECINTC_STARTING,
	147	CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
	148	CPUHP_AP_IRQ_THEAD_ACLINT_SSWI_STARTING,
	149	CPUHP_AP_IRQ_RISCV_IMSIC_STARTING,
	150	CPUHP_AP_IRQ_RISCV_SBI_IPI_STARTING,
	151	CPUHP_AP_ARM_MVEBU_COHERENCY,
	152	CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING,
	153	CPUHP_AP_PERF_X86_STARTING,
	154	CPUHP_AP_PERF_X86_AMD_IBS_STARTING,
	155	CPUHP_AP_PERF_XTENSA_STARTING,
	156	CPUHP_AP_ARM_VFP_STARTING,
	157	CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING,
	158	CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING,
	159	CPUHP_AP_PERF_ARM_ACPI_STARTING,
	160	CPUHP_AP_PERF_ARM_STARTING,
	161	CPUHP_AP_PERF_RISCV_STARTING,
	162	CPUHP_AP_ARM_L2X0_STARTING,
	163	CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
	164	CPUHP_AP_ARM_ARCH_TIMER_STARTING,
	165	CPUHP_AP_ARM_ARCH_TIMER_EVTSTRM_STARTING,
	166	CPUHP_AP_ARM_GLOBAL_TIMER_STARTING,
	167	CPUHP_AP_JCORE_TIMER_STARTING,
	168	CPUHP_AP_ARM_TWD_STARTING,
	169	CPUHP_AP_QCOM_TIMER_STARTING,
	170	CPUHP_AP_TEGRA_TIMER_STARTING,
	171	CPUHP_AP_ARMADA_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
	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	*/
	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	*/
	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	*/
	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	*/
	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	*/
	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	*/
	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	*/
	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
	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	*/
	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	*/
	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	*/
	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	*/
	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	*/
	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	*/
	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
	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
	523	static inline void cpuhp_ap_report_dead(void) { }
	524	static inline void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu) { }
	525	#endif
	526
	527	#endif