Re: [Buildroot] [PATCH 1/1] package/docker-engine: prefer cgroup v2 with kernel >=5.4 and no systemd

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

On Mon, 25 Aug 2025 12:24:27 +0200
Fiona Klute <fiona.klute@gmx.de> wrote:

> It looks like the "kernel too old for toolchain" problem appeared 
> before, in commit 521b6f85508ee9ab848b0b2ea1d36edaf1701bc1 that was the 
> reason to use the "stable" Bootlin toolchain instead of "bleeding-edge". 
> Earlier this year the stable toolchain was updated with headers 5.4 
> (commit 947dbc92a20c5acea7882166cae7893e6ea661e1), so I think the 
> reasonable solution here is to update the kernel. Looks like the kernel 
> config needs to be adjusted for 5.4.x, I'll send a patch when I have the 
> tests passing.

Indeed, now that the stable Bootlin toolchains use 5.4 headers, all
tests should use >= 5.4 kernel versions.

> Another question is if it still makes sense to claim support for kernel 
> versions < 5.4 and cgroup v1. Maybe it'd be better to simplify things 
> and have "depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_4" for all the 
> Docker packages, or even remove package/cgroupfs-mount entirely and 
> require all packages that need cgroups to use v2? There aren't that 
> many, grepping for BR2_PACKAGE_CGROUPFS_MOUNT (other than Docker and 
> Podman, which already works with either) there are package/moby-buildkit 
> (definitely supports cgroupv2), package/libvirt (haven't checked, but 
> I'd be extremely surprised if not), and package/balena-engine (no idea, 
> this is the first time I've heard of it).

Totally fine with this idea. I think it's OK to require a 5.4 kernel if
you want to run Docker.

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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