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

CONFIG_ARC_HAS_COH_RTSC (not configurable)

configname: CONFIG_ARC_HAS_COH_RTSC

Linux Kernel Configuration
└─>ARC Architecture Configuration
└─>ARC CPU Configuration
└─>ARC_HAS_COH_RTSC
In linux kernel since version 3.1 (release Date: 2011-10-24)  
depends
CONFIG_SMP

is depended by
CONFIG_ISS_SMP_EXTN