arch.s390x.cpu.hotplug Module Reference

Enumerations
enum class	cpu_hotplug_notify : u8 {   pre_up = 0 , post_up = 1 , pre_down = 2 , post_down = 3 ,   pre_setup = 4 , post_teardown = 5 }
	Notification reason code for the hotplug notifier chain.
enum class	cpu_hotplug_state : u8 {   absent = 0 , present = 1 , possible = 2 , online = 3 ,   offline = 4 , failed = 5 }
	CPU lifecycle states per the hotplug state machine.

Typedefs
using	arch::s390x::cpu::hotplug::hotplug_callback = auto (*)(u16 cpu_id, cpu_hotplug_notify reason) noexcept -> void
	Notifier callback signature.

Functions
auto	arch::s390x::cpu::hotplug::cpu_down (u16 cpu_id) noexcept -> ::std::expected< void, ::lib::kernel_error >
	Take a CPU offline.
auto	arch::s390x::cpu::hotplug::cpu_is_online (u16 cpu_id) noexcept -> bool
	Check if a CPU is online.
auto	arch::s390x::cpu::hotplug::cpu_is_possible (u16 cpu_id) noexcept -> bool
	Check if a CPU can be brought online.
auto	arch::s390x::cpu::hotplug::cpu_is_present (u16 cpu_id) noexcept -> bool
	Check if hardware exists at this slot.
auto	arch::s390x::cpu::hotplug::cpu_state (u16 cpu_id) noexcept -> cpu_hotplug_state
	Query the current hotplug state of a CPU.
auto	arch::s390x::cpu::hotplug::cpu_up (u16 cpu_id) noexcept -> ::std::expected< void, ::lib::kernel_error >
	Bring a CPU online.
auto	arch::s390x::cpu::hotplug::hotplug_init () noexcept -> void
	Initialize the hotplug subsystem — mark BSP online.
auto	arch::s390x::cpu::hotplug::hotplug_mark_possible (u16 cpu_id) noexcept -> void
	Mark a CPU as possible (ready for online).
auto	arch::s390x::cpu::hotplug::hotplug_mark_present (u16 cpu_id) noexcept -> void
	Mark a CPU slot as present (firmware reports hardware exists).
auto	arch::s390x::cpu::hotplug::hotplug_notify_str (cpu_hotplug_notify r) noexcept -> ::std::string_view
	Resolve hotplug notify reason to a human-readable string.
auto	arch::s390x::cpu::hotplug::hotplug_register_notifier (hotplug_callback cb) noexcept -> bool
	Register a hotplug notifier.
auto	arch::s390x::cpu::hotplug::is_valid_hotplug_target (cpu_hotplug_state s) noexcept -> bool
	Check whether a state is a valid hotplug target.

Variables
constexpr u32	arch::s390x::cpu::hotplug::HOTPLUG_NOTIFIER_MAX = 8
	Maximum number of registered hotplug notifiers.

Files
file	arch/s390x/cpu/hotplug.zcomponent/hotplug.cxxm
file	arch/s390x/cpu/hotplug.zcomponent/hotplug.cxx