CONFIG_ARC_CURR_IN_REG is not available for thedefaultarchitecture x86.
Result is shown for architecture arc

cache current task pointer in gp

configname: CONFIG_ARC_CURR_IN_REG

Linux Kernel Configuration
└─>ARC Architecture Configuration
└─>cache current task pointer in gp
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This reserves gp register to point to Current Task in
kernel mode eliding memory access for each access