CONFIG_MACH_LOONGSON1 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_MACH_LOONGSON1.
Result is shown for kernelversion 6.5.1

Loongson 1 family of machines

modulename: clk-ls1x.ko

configname: CONFIG_MACH_LOONGSON1

System type
└─>Loongson 1 family of machines
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This enables support for the Loongson 1 based machines.

Loongson 1 is a family of 32-bit MIPS-compatible SoCs developed by
the ICT (Institute of Computing Technology) and the Chinese Academy
of Sciences.

source code: