CONFIG_NR_CPUS_DEFAULT_2 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_NR_CPUS_DEFAULT_2.
Result is shown for kernelversion 6.2.5

CONFIG_NR_CPUS_DEFAULT_2 (not configurable)

configname: CONFIG_NR_CPUS_DEFAULT_2

Linux Kernel Configuration
└─>Kernel type
└─>NR_CPUS_DEFAULT_2
In linux kernel since version 2.6.21 (release Date: 2007-04-25)  
is depended by
CONFIG_MIPS_MT_SMP