CONFIG_NO_IDLE_HZ is not available for thedefaultarchitecture x86.
Result is shown for architecture ia64
default or selected kernelversion does not have config value CONFIG_NO_IDLE_HZ.
Result is shown for kernelversion 6.5.1

CONFIG_NO_IDLE_HZ (not configurable)

configname: CONFIG_NO_IDLE_HZ

Linux Kernel Configuration
└─>NO_IDLE_HZ
In linux kernel since version 2.6.12  
depends
CONFIG_XEN

is depended by
CONFIG_XEN