CONFIG_X86_IO_APIC (not configurable)

modulename: io_apic.ko

configname: CONFIG_X86_IO_APIC

Linux Kernel Configuration
└─>Processor type and features
└─>X86_IO_APIC
In linux kernel since version 2.6.12  
source code:
arch/x86/kernel/apic/io_apic.c
selects
CONFIG_GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
CONFIG_IRQ_DOMAIN

depends
CONFIG_PCI_MSI or CONFIG_SMP or CONFIG_X86_32_NON_STANDARD or CONFIG_X86_64 or CONFIG_X86_UP_IOAPIC