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Merge pull request #22968 from keszybz/kernel-4.4
Recommend kernel 4.15 or newer
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commit
39ff521c99
56
README
56
README
@ -30,14 +30,21 @@ LICENSE:
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LGPL-2.1-or-later for all code, exceptions noted in LICENSES/README.md
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REQUIREMENTS:
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Linux kernel >= 3.15
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Linux kernel >= 4.2 for unified cgroup hierarchy support
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Linux kernel >= 4.10 for cgroup-bpf egress and ingress hooks
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Linux kernel >= 4.15 for cgroup-bpf device hook
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Linux kernel >= 4.17 for cgroup-bpf socket address hooks
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Linux kernel >= 5.3 for bounded-loops in BPF program
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Linux kernel >= 5.4 for signed Verity images support
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Linux kernel >= 5.7 for BPF links and the BPF LSM hook
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Linux kernel ≥ 3.15
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≥ 4.5 for pids controller in cgroup v2
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≥ 4.6 for cgroup namespaces
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≥ 4.9 for RENAME_NOREPLACE support in vfat
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≥ 4.10 for cgroup-bpf egress and ingress hooks
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≥ 4.15 for cgroup-bpf device hook and cpu controller in cgroup v2
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≥ 4.17 for cgroup-bpf socket address hooks
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≥ 5.3 for bounded loops in BPF program
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≥ 5.4 for signed Verity images
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≥ 5.7 for BPF links and the BPF LSM hook
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Kernel versions below 4.15 have significant gaps in functionality and
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are not recommended for use with this version of systemd. Taint flag
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'old-kernel' will be set. Systemd will most likely still function, but
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upstream support and testing are limited.
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Kernel Config Options:
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CONFIG_DEVTMPFS
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@ -330,24 +337,41 @@ SYSV INIT.D SCRIPTS:
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Please see src/systemctl/systemd-sysv-install.SKELETON for how this
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needs to look like, and provide an implementation at the marked places.
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WARNINGS:
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WARNINGS and TAINT FLAGS:
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systemd will warn during early boot if /usr is not already mounted at
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this point (that means: either located on the same file system as / or
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already mounted in the initrd). While in systemd itself very little
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will break if /usr is on a separate, late-mounted partition, many of
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its dependencies very likely will break sooner or later in one form or
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will break if /usr is on a separate late-mounted partition, many of its
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dependencies very likely will break sooner or later in one form or
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another. For example, udev rules tend to refer to binaries in /usr,
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binaries that link to libraries in /usr or binaries that refer to data
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files in /usr. Since these breakages are not always directly visible,
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systemd will warn about this, since this kind of file system setup is
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not really supported anymore by the basic set of Linux OS components.
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systemd requires that the /run mount point exists. systemd also
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requires that /var/run is a symlink to /run.
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systemd will warn about this. Such setups are not really supported by
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the basic set of Linux OS components. Taint flag 'split-usr' will be
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set when this condition is detected.
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For more information on this issue consult
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https://www.freedesktop.org/wiki/Software/systemd/separate-usr-is-broken
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systemd requires that the /run mount point exists. systemd also
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requires that /var/run is a symlink to /run. Taint flag 'var-run-bad'
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will be set when this condition is detected.
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Systemd will also warn when the cgroup support is unavailable in the
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kernel (taint flag 'cgroups-missing'), the system is using the old
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cgroup hierarchy (taint flag 'cgroupsv1'), the hardware clock is
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running in non-UTC mode (taint flag 'local-hwclock'), the kernel
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overflow UID or GID are not 65534 (taint flags 'overflowuid-not-65534'
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and 'overflowgid-not-65534'), the UID or GID range assigned to the
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running systemd instance covers less than 0…65534 (taint flags
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'short-uid-range' and 'short-gid-range').
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Taint conditions are logged during boot, but may also be checked at any
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time with:
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busctl get-property org.freedesktop.systemd1 /org/freedesktop/systemd1 org.freedesktop.systemd1.Manager Tainted
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VALGRIND:
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To run systemd under valgrind, compile with meson option
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-Dvalgrind=true and have valgrind development headers installed
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(i.e. valgrind-devel or equivalent). Otherwise, false positives will be
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@ -74,4 +74,4 @@
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/* Path where systemd-oomd listens for varlink connections from user managers to report changes in ManagedOOM settings. */
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#define VARLINK_ADDR_PATH_MANAGED_OOM_USER "/run/systemd/oom/io.system.ManagedOOM"
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#define KERNEL_BASELINE_VERSION "3.15"
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#define KERNEL_BASELINE_VERSION "4.15"
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@ -4384,7 +4384,7 @@ char *manager_taint_string(Manager *m) {
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buf = new(char, sizeof("split-usr:"
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"cgroups-missing:"
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"cgrousv1:"
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"cgroupsv1:"
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"local-hwclock:"
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"var-run-bad:"
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"overflowuid-not-65534:"
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