CONFIG_MIPS_NR_CPU_NR_MAP_1024 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_MIPS_NR_CPU_NR_MAP_1024 (not configurable)

configname: CONFIG_MIPS_NR_CPU_NR_MAP_1024

Linux Kernel Configuration
└─>Kernel type
└─>MIPS_NR_CPU_NR_MAP_1024
In linux kernel since version 4.2 (release Date: 2015-08-30)