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

CONFIG_CPU_HAS_RIXI (not configurable)

configname: CONFIG_CPU_HAS_RIXI

Linux Kernel Configuration
└─>Kernel type
└─>CPU_HAS_RIXI
In linux kernel since version 4.1 (release Date: 2015-06-21)