CONFIG_TLS_REG_EMUL is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_TLS_REG_EMUL (not configurable)

configname: CONFIG_TLS_REG_EMUL

Linux Kernel Configuration
└─>TLS_REG_EMUL
In linux kernel since version 2.6.12  
An SMP system using a pre-ARMv6 processor (there are apparently
a few prototypes like that in existence) and therefore access to
that required register must be emulated.