Re: [Buildroot] [PATCHv2 0/7] Basic support for 64-bit kernel and 32-bit userland

From: "Yann E. MORIN" <yann.morin.1998@free.fr>
To: Thomas De Schampheleire <patrickdepinguin@gmail.com>
Cc: romain.naour@gmail.com,
	Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>,
	buildroot@buildroot.org
Subject: Re: [Buildroot] [PATCHv2 0/7] Basic support for 64-bit kernel and 32-bit userland
Date: Sat, 30 Jul 2022 21:43:31 +0200	[thread overview]
Message-ID: <20220730194331.GA2515056@scaer> (raw)
In-Reply-To: <20220115200306.14037-1-patrickdepinguin@gmail.com>

Thomas, All,

On 2022-01-15 21:02 +0100, Thomas De Schampheleire spake thusly:
> From: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
> Even though there are already cases where a 64-bit kernel is combined with
> 32-bit userland, like MIPS64n32, that Buildroot can support out-of-the-box,
> there are other combinations that don't currently work.
> 
> At work, we have two such cases:
> - 64-bit x86_64 kernel with 32-bit i386 userspace
> - 64-bit aarch64 kernel with 32-bit arm userspace
> 
> This series adds basic support for these cases, with the limitation that the
> user still needs to know what they are doing.

We've discussed this series, and Arnout provided some feedback.

It is not entirely clear that this is something we want to carry,
especially, as Arnout suggest, as there are other ways to do so.

I agree with most of what Arnout said. If your tooling can't handle
building two defconfigs, then I would adapt the tooling (it's very easy
with e.g. gitlab-CI to have two jobs in sequence, where the first builds
the kernel + modules, puts that artefacts, retrieved from the second job
that builds userland + final image).

It also look a bit to fragile and complex (as someone put it: "spit and
ducktape").

So, we're going to decline the rest of this series, sorry.

Regards,
Yann E. MORIN.

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