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Bump kernel recommended baseline to v5.4

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Mike Yuan 2024-10-15 18:36:51 +02:00
parent 7d3ae178fb
commit 102efcd312
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3 changed files with 11 additions and 5 deletions
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6
NEWS
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@ -47,6 +47,12 @@ CHANGES WITH 257 in spe:
migrated between cgroups. It might be fully removed in a future release
(reach out if you have use cases).
* The recommended kernel baseline version has been bumped to v5.4
(released in 2019). Expect limited testing on older kernel versions,
where "old-kernel" taint flag would also be set. Support for them
will be phased out in a future release in 2025, i.e. we expect to bump
the minimum baseline to v5.4 then too.
* Support for cgroup v1 ('legacy' and 'hybrid' hierarchies) is now
considered obsolete and systemd by default will refuse to boot under
it. To forcibly reenable cgroup v1 support,

8
README
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@ -39,16 +39,16 @@ REQUIREMENTS:
≥ 4.17 for cgroup-bpf socket address hooks
≥ 4.20 for PSI (used by systemd-oomd)
≥ 5.3 for bounded loops in BPF program
≥ 5.4 for signed Verity images
≥ 5.7 for BPF links and the BPF LSM hook
≥ 5.4 for pidfd and signed Verity images
≥ 5.7 for CLONE_INTO_CGROUP, BPF links and the BPF LSM hook
⛔ Kernel versions below 3.15 ("minimum baseline") are not supported at
all, and are missing required functionality (e.g. CLOCK_BOOTTIME
support for timerfd_create()).
⚠️ Kernel versions below 4.15 ("recommended baseline") have significant
⚠️ Kernel versions below 5.4 ("recommended baseline") have significant
gaps in functionality and are not recommended for use with this version
of systemd (e.g. lack sufficiently comprehensive and working cgroupv2
of systemd (e.g. lack race-free process tracking by pidfd and new mount API
support). Taint flag 'old-kernel' will be set. systemd will most likely
still function, but upstream support and testing are limited.

2
src/basic/constants.h
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@ -85,4 +85,4 @@
/* Path where systemd-oomd listens for varlink connections from user managers to report changes in ManagedOOM settings. */
#define VARLINK_ADDR_PATH_MANAGED_OOM_USER "/run/systemd/oom/io.systemd.ManagedOOM"
#define KERNEL_BASELINE_VERSION "4.15"
#define KERNEL_BASELINE_VERSION "5.4"