TIL: If you have full-disk encryption with a key embedded in initrd (https://en.opensuse.org/SDB:Encrypted_root_file_system#Avoiding_to_type_the_passphrase_twice) you can easily use kexec (https://doc.opensuse.org/documentation/leap/tuning/html/book.sle.tuning/cha-tuning-kexec.html#cha-tuning-kexec-basic-usage) for fast and passwordless reboots.
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