CONFIG_MIPS_RM9122 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_MIPS_RM9122 (not configurable)

configname: CONFIG_MIPS_RM9122

Linux/MIPS Kernel Configuration
└─>MIPS_RM9122
In linux kernel since version 2.6.19 (release Date: 2006-11-29)