CONFIG_SYS_HAS_CPU_LOONGSON2E is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_SYS_HAS_CPU_LOONGSON2E (not configurable)

configname: CONFIG_SYS_HAS_CPU_LOONGSON2E

Linux Kernel Configuration
└─>CPU selection
└─>SYS_HAS_CPU_LOONGSON2E
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
is selected by
CONFIG_CPU_LOONGSON2E