default or selected kernelversion does not have config value CONFIG_LUSTRE_LLITE_LLOOP.
Result is shown for kernelversion 6.5.1

Lustre virtual block device

modulename: llite_lloop.ko

configname: CONFIG_LUSTRE_LLITE_LLOOP

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Lustre virtual block device
In linux kernel since version 3.12 (release Date: 2013-11-03)  
source code:
drivers/staging/lustre/lustre/llite//