CONFIG_ARC_HAS_RTSC is not available for thedefaultarchitecture x86.
Result is shown for architecture arc
default or selected kernelversion does not have config value CONFIG_ARC_HAS_RTSC.
Result is shown for kernelversion 6.5.1

Insn: RTSC (64-bit r/o cycle counter)

configname: CONFIG_ARC_HAS_RTSC

Linux Kernel Configuration
└─>ARC Architecture Configuration
└─>ARC CPU Configuration
└─>Enable support for Rel 4.10 features
└─>Insn: RTSC (64-bit r/o cycle counter)
In linux kernel since version 3.1 (release Date: 2011-10-24)