CONFIG_CPU_MIPSR2_IRQ_VI is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

Vectored interrupt mode

configname: CONFIG_CPU_MIPSR2_IRQ_VI

Linux/MIPS Kernel Configuration
└─>Kernel type
└─>MIPSR2 Interrupt handling
└─>Vectored interrupt mode
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
Vectored interrupt mode allowing faster dispatching of interrupts.
The board support code needs to be written to take advantage of this
mode. Compatibility code is included to allow the kernel to run on
a CPU that does not support vectored interrupts. It's safe to
say Y here.