≥ 4.15 for cgroup-bpf device hook and cpu controller in cgroup v2
≥ 4.17 for cgroup-bpf socket address hooks and /sys/power/resume_offset
≥ 4.20 for PSI (used by systemd-oomd)
- ≥ 5.2 for cgroup freezer, and fsopen()
+ ≥ 5.2 for cgroup freezer and new mount API
≥ 5.3 for bounded loops in BPF program and keyring namespacing
- ≥ 5.4 for pidfd, new mount API, and signed Verity images
+ ≥ 5.4 for pidfd and signed Verity images
⛔ Kernel versions below 5.4 ("minimum baseline") are not supported at all,
and are missing required functionality as listed above.