CONFIG_HAVE_ARCH_KCSAN (not configurable)

configname: CONFIG_HAVE_ARCH_KCSAN

Linux Kernel Configuration
└─>Kernel hacking
└─>Generic Kernel Debugging Instruments
└─>HAVE_ARCH_KCSAN
In linux kernel since version 5.1 (release Date: 2019-05-05)  
is selected by
CONFIG_KCSAN