CONFIG_CPU_PABRT_LEGACY is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_CPU_PABRT_LEGACY (not configurable)

modulename: pabort-legacy.ko

configname: CONFIG_CPU_PABRT_LEGACY

Linux Kernel Configuration
└─>CPU_PABRT_LEGACY
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
source code:
/arch/arm/mm/