CONFIG_MACH_LOONGSON64 is not available for the selected architecture x86.
Result is shown for architecture loongarch

CONFIG_MACH_LOONGSON64 (not configurable)

modulename: cop2-ex.ko

configname: CONFIG_MACH_LOONGSON64

Linux Kernel Configuration
└─>MACH_LOONGSON64
In linux kernel since version 3.10 (release Date: 2013-06-30)