486SX

configname: CONFIG_M486SX

Processor family
└─>486SX
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Select this for an 486-class CPU without an FPU such as
AMD/Cyrix/IBM/Intel SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5S.

depends
CONFIG_X86_32

is selected by
CONFIG_HIGHMEM64G