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Merge pull request #34795 from YHNdnzj/bump-kernel-baseline-5.4

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Bump kernel baseline to 5.4
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Lennart Poettering 2024-10-17 14:42:25 +02:00 committed by GitHub
commit 67fd2f0ef3
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3 changed files with 50 additions and 44 deletions
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84
NEWS
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@ -16,47 +16,9 @@ CHANGES WITH 257 in spe:
LoadCredentialEncrypted= service setting. Previously it could only
read raw binary data.
Announcements of Future Feature Removals and Incompatible Changes:
* To work around limitations of X11's keyboard handling systemd's
keyboard mapping hardware database (hwdb.d/60-keyboard.hwdb) so far
mapped the microphone mute and touchpad on/off/toggle keys to the
function keys F20, F21, F22, F23 instead of their correct key
codes. This key code mangling will be removed in the next systemd
release v258. To maintain compatibility with X11 applications that
rely on the old function key code mappings, this mangling has now
been moved to the relevant X11 keyboard driver modules instead. Thus,
in order to ensure these keys continue to work as before make sure to
update the xf86-input-evdev and xf86-input-libinput packages to the
newest version before updating systemd to v258.
* Support for automatic flushing of the nscd user/group database caches
has been dropped.
* 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,
SYSTEMD_CGROUP_ENABLE_LEGACY_FORCE=1 must be set on kernel command
line. The meson option 'default-hierarchy=' is also deprecated, i.e.
only cgroup v2 ('unified' hierarchy) can be selected as build-time
default.
* Support for System V service scripts is deprecated and will be
removed in a future release. Please make sure to update your software
*now* to include a native systemd unit file instead of a legacy
System V script to retain compatibility with future systemd releases.
* Support for the SystemdOptions EFI variable is deprecated.
'bootctl systemd-efi-options' will emit a warning when used. It seems
that this feature is little-used and it is better to use alternative
approaches like credentials and confexts. The plan is to drop support
altogether at a later point, but this might be revisited based on
user feedback.
* systemd-run's switch --expand-environment= which currently is disabled
by default when combined with --scope, will be changed in a future
release to be enabled by default.
* The FileDescriptorName= setting for socket units is now honored by
Accept=yes sockets too, where it was previously silently ignored and
"connection" was used unconditionally.
@ -78,8 +40,52 @@ CHANGES WITH 257 in spe:
filesystem. $SYSTEMD_NSPAWN_UNIFIED_HIERARCHY=0 can be used to override
this behavior.
Announcements of Future Feature Removals:
* D-Bus method org.freedesktop.systemd1.StartAuxiliaryScope() becomes
deprecated (reach out if you have use cases).
deprecated because accounting data and such cannot be reasonably
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,
SYSTEMD_CGROUP_ENABLE_LEGACY_FORCE=1 must be set on kernel command
line. The complete removal of cgroup v1 is scheduled for v258.
* Support for System V service scripts is deprecated and will be
removed in v258. Please make sure to update your software
*now* to include a native systemd unit file instead of a legacy
System V script to retain compatibility with future systemd releases.
* To work around limitations of X11's keyboard handling systemd's
keyboard mapping hardware database (hwdb.d/60-keyboard.hwdb) so far
mapped the microphone mute and touchpad on/off/toggle keys to the
function keys F20, F21, F22, F23 instead of their correct key
codes. This key code mangling will be removed in the next systemd
release v258. To maintain compatibility with X11 applications that
rely on the old function key code mappings, this mangling has now
been moved to the relevant X11 keyboard driver modules instead. Thus,
in order to ensure these keys continue to work as before make sure to
update the xf86-input-evdev and xf86-input-libinput packages to the
newest version before updating systemd to v258.
* Support for the SystemdOptions EFI variable is deprecated.
'bootctl systemd-efi-options' will emit a warning when used. It seems
that this feature is little-used and it is better to use alternative
approaches like credentials and confexts. The plan is to drop support
altogether at a later point, but this might be revisited based on
user feedback.
* systemd-run's switch --expand-environment= which currently is disabled
by default when combined with --scope, will be changed in a future
release to be enabled by default.
libsystemd:

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"