Enable userfaultfd() system call

modulename: userfaultfd.ko

configname: CONFIG_USERFAULTFD

Linux Kernel Configuration
└─>Memory Management options
└─>Enable userfaultfd() system call
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
Enable the userfaultfd() system call that allows to intercept and
handle page faults in userland.

source code:
fs/userfaultfd.c
depends
CONFIG_MMU