CONFIG_SIRF_IRQ is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_SIRF_IRQ (not configurable)

modulename: irq.ko

configname: CONFIG_SIRF_IRQ

Linux Kernel Configuration
└─>SIRF_IRQ
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
arch/arm/mach-prima2/irq.c

is depended by
CONFIG_ARCH_PRIMA2