CONFIG_CPU_R3000 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

R3000

modulename: c-r3k.ko

and/or

r3k_dump_tlb.ko

and/or

r2300_fpu.ko

configname: CONFIG_CPU_R3000

CPU type
└─>R3000
In linux kernel since version 2.6.12  
Please make sure to pick the right CPU type. Linux/MIPS is not
designed to be generic, i.e. Kernels compiled for R3000 CPUs will
*not* work on R4000 machines and vice versa. However, since most
of the supported machines have an R4000 (or similar) CPU, R4x00
might be a safe bet. If the resulting kernel does not work,
try to recompile with R3000.

source code: