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It was merged in 5.15. Does any major distro configure this in?

• usr1106 4y ago
  Looks like already Ubuntu 20.04 has it as a loadable module. However, it can be started only by a privileged user and it requires user space tools. So I would guess it's not running unless the sysadmin has actively configured it. Even in Linux 6.1 it is marked experimental.