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CONFIG_X86_UP_IOAPIC: IO-APIC support on uniprocessors

General informations

The Linux kernel configuration item CONFIG_X86_UP_IOAPIC has multiple definitions:

IO-APIC support on uniprocessors found in arch/i386/Kconfig

The configuration item CONFIG_X86_UP_IOAPIC:

• prompt: IO-APIC support on uniprocessors
• type: bool
• depends on: ! CONFIG_SMP && CONFIG_X86_UP_APIC
• defined in arch/i386/Kconfig
• found in Linux kernels: 2.6.0–2.6.23

Help text

An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an SMP-capable replacement for PC-style interrupt controllers. Most SMP systems and a small number of uniprocessor systems have one. If you have a single-CPU system with an IO-APIC, you can say Y here to use it. If you say Y here even though your machine doesn't have an IO-APIC, then the kernel will still run with no slowdown at all.

If you have a system with several CPUs, you do not need to say Y here: the IO-APIC will be used automatically.

IO-APIC support on uniprocessors found in arch/x86/Kconfig

The configuration item CONFIG_X86_UP_IOAPIC:

• prompt: IO-APIC support on uniprocessors
• type: bool
• depends on: CONFIG_X86_UP_APIC
• defined in arch/x86/Kconfig
• found in Linux kernels: 2.6.24–2.6.39, 3.0–3.9, 3.10-rc+HEAD

Help text

An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an SMP-capable replacement for PC-style interrupt controllers. Most SMP systems and many recent uniprocessor systems have one.

If you have a single-CPU system with an IO-APIC, you can say Y here to use it. If you say Y here even though your machine doesn't have an IO-APIC, then the kernel will still run with no slowdown at all.

Hardware

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