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CONFIG_X86_UP_APIC: Local APIC support on uniprocessors
General informations
The Linux kernel configuration item CONFIG_X86_UP_APIC has multiple definitions:
Local APIC support on uniprocessors found in arch/i386/Kconfig
The configuration item CONFIG_X86_UP_APIC:
- prompt: Local APIC support on uniprocessors
- type: bool
- depends on:
(! CONFIG_SMP ) && (!( CONFIG_X86_VISWS || CONFIG_X86_VOYAGER )) - defined in arch/i386/Kconfig
- found in Linux kernels: 2.6.0–2.6.23
Help text
A local APIC (Advanced Programmable Interrupt Controller) is an integrated interrupt controller in the CPU. If you have a single-CPU system which has a processor with a local APIC, you can say Y here to enable and use it. If you say Y here even though your machine doesn't have a local APIC, then the kernel will still run with no slowdown at all. The local APIC supports CPU-generated self-interrupts (timer, performance counters), and the NMI watchdog which detects hard lockups.
If you have a system with several CPUs, you do not need to say Y here: the local APIC will be used automatically.
Local APIC support on uniprocessors found in arch/x86/Kconfig
The configuration item CONFIG_X86_UP_APIC:
- prompt: Local APIC support on uniprocessors
- type: bool
- depends on:
CONFIG_X86_32 && ! CONFIG_SMP && ! CONFIG_X86_32_NON_STANDARD - 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
A local APIC (Advanced Programmable Interrupt Controller) is an integrated interrupt controller in the CPU. If you have a single-CPU system which has a processor with a local APIC, you can say Y here to enable and use it. If you say Y here even though your machine doesn't have a local APIC, then the kernel will still run with no slowdown at all. The local APIC supports CPU-generated self-interrupts (timer, performance counters), and the NMI watchdog which detects hard lockups.
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