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

Use 1 TC on each available VPE for SMP

modulename: smp_mt.ko

and/or

msp_smp.ko

and/or

smp-mt.ko

configname: CONFIG_MIPS_MT_SMP

MIPS MT options
└─>Use 1 TC on each available VPE for SMP
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
source code:
arch/mips/kernel/smp_mt.c

depends
 or CONFIG_SYS_SUPPORTS_MULTITHREADING |
NOT | CONFIG_CPU_MICROMIPS or  NOT CONFIG_CPU_MIPSR6