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linux-stable/include/linux/cpuhotplug.h
Thomas Gleixner 18415f33e2 cpu/hotplug: Allow "parallel" bringup up to CPUHP_BP_KICK_AP_STATE 
There is often significant latency in the early stages of CPU bringup, and
time is wasted by waking each CPU (e.g. with SIPI/INIT/INIT on x86) and
then waiting for it to respond before moving on to the next.

Allow a platform to enable parallel setup which brings all to be onlined
CPUs up to the CPUHP_BP_KICK_AP state. While this state advancement on the
control CPU (BP) is single-threaded the important part is the last state
CPUHP_BP_KICK_AP which wakes the to be onlined CPUs up.

This allows the CPUs to run up to the first sychronization point
cpuhp_ap_sync_alive() where they wait for the control CPU to release them
one by one for the full onlining procedure.

This parallelism depends on the CPU hotplug core sync mechanism which
ensures that the parallel brought up CPUs wait for release before touching
any state which would make the CPU visible to anything outside the hotplug
control mechanism.

To handle the SMT constraints of X86 correctly the bringup happens in two
iterations when CONFIG_HOTPLUG_SMT is enabled. The control CPU brings up
the primary SMT threads of each core first, which can load the microcode
without the need to rendevouz with the thread siblings. Once that's
completed it brings up the secondary SMT threads.

Co-developed-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Tested-by: Helge Deller <deller@gmx.de> # parisc
Tested-by: Guilherme G. Piccoli <gpiccoli@igalia.com> # Steam Deck
Link: https://lore.kernel.org/r/20230512205257.240231377@linutronix.de
2023-05-15 13:45:02 +02:00

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/* 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
* CPU_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_PREPARE_DYN or CPUHP_PREPARE_ONLINE
* 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_PREPARE,
CPUHP_PERF_X86_PREPARE,
CPUHP_PERF_X86_AMD_UNCORE_PREP,
CPUHP_PERF_POWER,
CPUHP_PERF_SUPERH,
CPUHP_X86_HPET_DEAD,
CPUHP_X86_APB_DEAD,
CPUHP_X86_MCE_DEAD,
CPUHP_VIRT_NET_DEAD,
CPUHP_IBMVNIC_DEAD,
CPUHP_SLUB_DEAD,
CPUHP_DEBUG_OBJ_DEAD,
CPUHP_MM_WRITEBACK_DEAD,
/* Must be after CPUHP_MM_VMSTAT_DEAD */
CPUHP_MM_DEMOTION_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_XFS_DEAD,
CPUHP_PERCPU_CNT_DEAD,
CPUHP_RADIX_DEAD,
CPUHP_PAGE_ALLOC,
CPUHP_NET_DEV_DEAD,
CPUHP_PCI_XGENE_DEAD,
CPUHP_IOMMU_IOVA_DEAD,
CPUHP_LUSTRE_CFS_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_PROFILE_PREPARE,
CPUHP_X2APIC_PREPARE,
CPUHP_SMPCFD_PREPARE,
CPUHP_RELAY_PREPARE,
CPUHP_SLAB_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_NET_FLOW_PREPARE,
CPUHP_TOPOLOGY_PREPARE,
CPUHP_NET_IUCV_PREPARE,
CPUHP_ARM_BL_PREPARE,
CPUHP_TRACE_RB_PREPARE,
CPUHP_MM_ZS_PREPARE,
CPUHP_MM_ZSWP_MEM_PREPARE,
CPUHP_MM_ZSWP_POOL_PREPARE,
CPUHP_KVM_PPC_BOOK3S_PREPARE,
CPUHP_ZCOMP_PREPARE,
CPUHP_TIMERS_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_RISCV_STARTING,
CPUHP_AP_IRQ_LOONGARCH_STARTING,
CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
CPUHP_AP_ARM_MVEBU_COHERENCY,
CPUHP_AP_MICROCODE_LOADER,
CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING,
CPUHP_AP_PERF_X86_STARTING,
CPUHP_AP_PERF_X86_AMD_IBS_STARTING,
CPUHP_AP_PERF_X86_CQM_STARTING,
CPUHP_AP_PERF_X86_CSTATE_STARTING,
CPUHP_AP_PERF_XTENSA_STARTING,
CPUHP_AP_MIPS_OP_LOONGSON3_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_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_MARCO_TIMER_STARTING,
CPUHP_AP_MIPS_GIC_TIMER_STARTING,
CPUHP_AP_ARC_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_CORESIGHT_STARTING,
CPUHP_AP_ARM_CORESIGHT_CTI_STARTING,
CPUHP_AP_ARM64_ISNDEP_STARTING,
CPUHP_AP_SMPCFD_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_KVM_ONLINE,
CPUHP_AP_SCHED_WAIT_EMPTY,
CPUHP_AP_SMPBOOT_THREADS,
CPUHP_AP_X86_VDSO_VMA_ONLINE,
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_X86_RAPL_ONLINE,
CPUHP_AP_PERF_X86_CQM_ONLINE,
CPUHP_AP_PERF_X86_CSTATE_ONLINE,
CPUHP_AP_PERF_X86_IDXD_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_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_WATCHDOG_ONLINE,
CPUHP_AP_WORKQUEUE_ONLINE,
CPUHP_AP_RANDOM_ONLINE,
CPUHP_AP_RCUTREE_ONLINE,
CPUHP_AP_BASE_CACHEINFO_ONLINE,
CPUHP_AP_ONLINE_DYN,
CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 30,
/* Must be after CPUHP_AP_ONLINE_DYN for node_states[N_CPU] update */
CPUHP_AP_MM_DEMOTION_ONLINE,
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
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