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CONFIG_HOTPLUG_CPU: Support for enabling/disabling CPUs

General informations

The Linux kernel configuration item CONFIG_HOTPLUG_CPU has multiple definitions:

arch/powerpc/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for enabling/disabling CPUs
type: tristate
depends on: CONFIG_SMP && CONFIG_HOTPLUG && CONFIG_EXPERIMENTAL && ( CONFIG_PPC_PSERIES || CONFIG_PPC_PMAC )
defined in arch/powerpc/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to be able to disable and re-enable individual CPUs at runtime on SMP machines.

Say N if you are unsure.

arch/sparc/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for hot-pluggable CPUs
type: tristate
depends on: CONFIG_SPARC64 && CONFIG_SMP
defined in arch/sparc/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to experiment with turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu/cpu#. Say N if you want to disable CPU hotplug.

arch/mn10300/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt:
type: tristate
depends on: (none)
defined in arch/mn10300/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

arch/mips/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt:
type: tristate
depends on: (none)
defined in arch/mips/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

arch/mips/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for hot-pluggable CPUs
type: tristate
depends on: CONFIG_SMP && CONFIG_HOTPLUG && CONFIG_SYS_SUPPORTS_HOTPLUG_CPU
defined in arch/mips/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to allow turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu. (Note: power management support will enable this option automatically on SMP systems. ) Say N if you want to disable CPU hotplug.

arch/arm/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for hot-pluggable CPUs (EXPERIMENTAL)
type: tristate
depends on: CONFIG_SMP && CONFIG_HOTPLUG && CONFIG_EXPERIMENTAL
defined in arch/arm/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to experiment with turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu.

arch/blackfin/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for hot-pluggable CPUs
type: tristate
depends on: CONFIG_SMP && CONFIG_HOTPLUG
defined in arch/blackfin/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

arch/sh/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for hot-pluggable CPUs (EXPERIMENTAL)
type: tristate
depends on: CONFIG_SMP && CONFIG_HOTPLUG && CONFIG_EXPERIMENTAL
defined in arch/sh/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to experiment with turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu.

arch/ia64/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for hot-pluggable CPUs (EXPERIMENTAL)
type: tristate
depends on: CONFIG_SMP && CONFIG_EXPERIMENTAL
defined in arch/ia64/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to experiment with turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu/cpu#. Say N if you want to disable CPU hotplug.

arch/s390/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for hot-pluggable CPUs
type: tristate
depends on: CONFIG_SMP
defined in arch/s390/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to be able to turn CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu/cpu#. Say N if you want to disable CPU hotplug.

arch/s390/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for hot-pluggable CPUs (EXPERIMENTAL)
type: tristate
depends on: CONFIG_SMP && CONFIG_EXPERIMENTAL
defined in arch/s390/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to experiment with turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu/cpu#. Say N if you want to disable CPU hotplug.

arch/x86/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for hot-pluggable CPUs
type: tristate
depends on: CONFIG_SMP && CONFIG_HOTPLUG && ! CONFIG_X86_VOYAGER
defined in arch/x86/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to allow turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu. ( Note: power management support will enable this option automatically on SMP systems. ) Say N if you want to disable CPU hotplug.

arch/x86/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)
type: tristate
depends on: CONFIG_SMP && CONFIG_HOTPLUG && CONFIG_EXPERIMENTAL && ! CONFIG_X86_VOYAGER
defined in arch/x86/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to experiment with turning CPUs off and on, and to enable suspend on SMP systems. CPUs can be controlled through /sys/devices/system/cpu. Say N if you want to disable CPU hotplug and don't need to suspend.

arch/sparc64/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for hot-pluggable CPUs
type: tristate
depends on: CONFIG_SMP
defined in arch/sparc64/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to experiment with turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu/cpu#. Say N if you want to disable CPU hotplug.

arch/parisc/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt:
type: tristate
depends on: CONFIG_SMP
defined in arch/parisc/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

arch/ppc64/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for hot-pluggable CPUs
type: tristate
depends on: CONFIG_SMP && CONFIG_EXPERIMENTAL && ( CONFIG_PPC_PSERIES || CONFIG_PPC_PMAC )
defined in arch/ppc64/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to be able to turn CPUs off and on.

Say N if you are unsure.

arch/x86_64/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for hot-pluggable CPUs (EXPERIMENTAL)
type: tristate
depends on: CONFIG_SMP && CONFIG_HOTPLUG && CONFIG_EXPERIMENTAL
defined in arch/x86_64/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to experiment with turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu/cpu#. Say N if you want to disable CPU hotplug.

arch/x86_64/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)
type: tristate
depends on: CONFIG_SMP && CONFIG_HOTPLUG && CONFIG_EXPERIMENTAL
defined in arch/x86_64/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to experiment with turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu/cpu#. This is also required for suspend/hibernation on SMP systems.

Say N if you want to disable CPU hotplug and don't need to suspend.

arch/i386/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for hot-pluggable CPUs (EXPERIMENTAL)
type: tristate
depends on: CONFIG_SMP && CONFIG_HOTPLUG && CONFIG_EXPERIMENTAL
defined in arch/i386/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to experiment with turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu.

Say N.

arch/i386/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)
type: tristate
depends on: CONFIG_SMP && CONFIG_HOTPLUG && CONFIG_EXPERIMENTAL && ! CONFIG_X86_VOYAGER
defined in arch/i386/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to experiment with turning CPUs off and on, and to enable suspend on SMP systems. CPUs can be controlled through /sys/devices/system/cpu.

arch/ppc/Kconfig

The configuration item CONFIG_HOTPLUG_CPU:

prompt: Support for enabling/disabling CPUs
type: tristate
depends on: CONFIG_SMP && CONFIG_HOTPLUG && CONFIG_EXPERIMENTAL && CONFIG_PPC_PMAC
defined in arch/ppc/Kconfig
found in Linux Kernels: from 2.6.6 release still available on 2.6.34 release

Help text

Say Y here to be able to disable and re-enable individual CPUs at runtime on SMP machines.

Say N if you are unsure.

Hardware

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Sources

Linux Kernel
Linux Kernel Driver DataBase (LKDDb)

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