[systemd-devel] Required kernel version for pid1 only?

[林自均]

Hi Zbyszek and Mantas,

I got it. Thank you for the detailed answers.

John Lin

Mantas Mikulėnas <grawity at gmail.com> 於 2018年1月9日 週二 下午4:23寫道：

> On Tue, Jan 9, 2018 at 10:10 AM, 林自均 <johnlinp at gmail.com> wrote:
>
>> Hi folks,
>>
>> I saw the following lines in README:
>>
>> > REQUIREMENTS:
>> >         Linux kernel >= 3.13
>> >         Linux kernel >= 4.2 for unified cgroup hierarchy support
>>
>> I guess it means that some part of the whole systemd project requires
>> Linux kernel 3.13. What if I don't need that part and only pid1 is relevant
>> to me? Is such information provided somewhere?
>>
>
> There's no full list. You can only check commit logs to find out why the
> requirement was bumped (git log -p README), but once the new dependency is
> published, it's always possible that other parts of systemd code will start
> implicitly depending on *other* kernel features available in that release.
>
> For example, here's what prompted each bump:
>
> 3.13 - DM_DEFERRED_REMOVE (dcce98a4bdc3)
> 3.12 - %P in core_pattern (58015d7815bc)
> 3.11 - arbitrary (a0c3e16b7bce)
> 3.7 - kernel-based firmware loading (be2ea723b1d0)
> 3.0 - cgroup.procs (e946948eff51)
> 2.6.39 - oh come on
>
> ~
>
> In short, if it says "REQUIREMENTS: Linux ≥ 3.13", that's what you need to
> use. Anything below that is at your own risk.
>
> --
> Mantas Mikulėnas
>
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