sudo pacman -S llvm clang lld
make LLVM=1

sudo insmod fake_time_driver.ko

Check logs:

dmesg | tail

Example:

Fake Time Driver: Initializing Fake device created at /dev/fake_time

cat /dev/fake_time

Current kernel time: 1710001234.123456789

sudo rmmod fake_time_driver

sudo pacman -S llvm clang lld