CONFIG_LOCKUP_DETECTOR (not configurable)

modulename: watchdog.ko

configname: CONFIG_LOCKUP_DETECTOR

Linux Kernel Configuration
└─>Kernel hacking
└─>Debug Oops, Lockups and Hangs
└─>LOCKUP_DETECTOR
In linux kernel since version 2.6.36 (release Date: 2010-10-20)  
source code:
kernel/watchdog.c