From arekm at maven.pl  Thu Dec 22 11:49:52 2022
From: arekm at maven.pl (=?UTF-8?Q?Arkadiusz_Mi=c5=9bkiewicz?=)
Date: Thu, 22 Dec 2022 11:49:52 +0100
Subject: udev-core R >= 4.15
Message-ID: <89c504b3-b495-8359-c193-93d62e6debba@maven.pl>

udev-core change:

-Requires:      uname(release) >= 3.13
+Requires:      uname(release) >= 4.15


Is this true requirement?

I mean docs say:

"
     README: say kernel 4.15 is the minimum recommended

     After various long discussions
 
(https://lists.freedesktop.org/archives/systemd-devel/2022-March/047587.html,
     https://lwn.net/Articles/889610/), there is no clear answer what 
the minimum
     version should be. Bumping the version above 3.15 doesn't allow us 
to make any
     significant simplifications (unless we went *much* higher). In 
particular, even
     renameat2() is not fully supported with latest kernel versions, 
e.g. nfs still
     doesn't have it. And the bpf stuff is optional anyway. So let's 
just say that
     4.15 is what we recommend, because it provides fairly complete 
cgroups-v2, but
     without any removals of compat in the code."


and

"+        Kernel versions below 4.15 have significant gaps in 
functionality and
+        are not recommended for use with this version of systemd. Taint 
flag
+        'old-kernel' will be set. Systemd will most likely still 
function, but
+        upstream support and testing are limited."

so looks like it should work on older kernels but there could be problems.

Is there really some problem with udev-core that needs forcing >= 4.15? 
(I'm still using vserver 4.9 kernels)


-- 
Arkadiusz Mi?kiewicz, arekm / ( maven.pl | pld-linux.org )


From atler at pld-linux.org  Thu Dec 22 12:06:44 2022
From: atler at pld-linux.org (Jan Palus)
Date: Thu, 22 Dec 2022 12:06:44 +0100
Subject: udev-core R >= 4.15
In-Reply-To: <89c504b3-b495-8359-c193-93d62e6debba@maven.pl>
References: <89c504b3-b495-8359-c193-93d62e6debba@maven.pl>
Message-ID: <20221222110644.2ti2cdnpyzy6qiro@pine>

On 22.12.2022 11:49, Arkadiusz Mi?kiewicz via pld-devel-en wrote:
> udev-core change:
> 
> -Requires:      uname(release) >= 3.13
> +Requires:      uname(release) >= 4.15
> 
> 
> Is this true requirement?

This R: was updated purely based on very first entry in release notes for 251:

    Backwards-incompatible changes:

    * The minimum kernel version required has been bumped from 3.13 to 4.15,
      and CLOCK_BOOTTIME is now assumed to always exist.

If it actually works with lower kernel versions feel free to adjust.