CONFIG_CPU_MIPSR2_SRS is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_CPU_MIPSR2_SRS (not configurable)

configname: CONFIG_CPU_MIPSR2_SRS

Linux/MIPS Kernel Configuration
└─>Kernel type
└─>CPU_MIPSR2_SRS
In linux kernel since version 2.6.15 (release Date: 2006-01-02)