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

CONFIG_ARCH_HAS_BARRIERS (not configurable)

configname: CONFIG_ARCH_HAS_BARRIERS

Linux Kernel Configuration
└─>ARCH_HAS_BARRIERS
In linux kernel since version 2.6.34 (release Date: 2010-05-16)  
This option allows the use of custom mandatory barriers
included via the mach/barriers.h file.