linux-kernel - Re: linux-next: build failure after merge of Linus' tree

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Message-ID: <CA+icZUVVRvXA0G932bsEiEWhdv=Zd0WOPOEMXeHudTzqEp6pKA@mail.gmail.com>
Date: Thu, 26 Sep 2024 16:44:03 +0200
From: Sedat Dilek <sedat.dilek@...il.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Nathan Chancellor <nathan@...nel.org>, Stephen Rothwell <sfr@...b.auug.org.au>, 
	Alice Ryhl <aliceryhl@...gle.com>, Linus Torvalds <torvalds@...ux-foundation.org>, 
	Matthew Maurer <mmaurer@...gle.com>, Sami Tolvanen <samitolvanen@...gle.com>, 
	Gatlin Newhouse <gatlin.newhouse@...il.com>, Kees Cook <kees@...nel.org>, 
	"Peter Zijlstra (Intel)" <peterz@...radead.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Andrey Konovalov <andreyknvl@...il.com>, Marco Elver <elver@...gle.com>, 
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, 
	Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of Linus' tree

On Thu, Sep 26, 2024 at 2:58 PM Miguel Ojeda
<miguel.ojeda.sandonis@...il.com> wrote:
>
> On Thu, Sep 26, 2024 at 2:49 PM Sedat Dilek <sedat.dilek@...il.com> wrote:
> >
> > Do you offer a (an optimized - optimized for kernel-builds) prebuilt
> > RUST toolchain - preferable for x86-64 hosts - like Nathan +
> > LLVM/Clang folk offer (see [1],[2])?
>
> Yes, Nathan himself provides those! :)
>
>     https://mirrors.edge.kernel.org/pub/tools/llvm/rust/
>

Thanks for the link!
OK, I darkly remember seeing this somewhere.

> He may comment further -- I think the Rust compiler itself is not
> built (yet?) with PGO etc. like he does for the LLVM side.
>
> As usual -- thanks Nathan!
>
> > Maybe I have missed in [3] or overlooked.
>
> If you go into the Quick Start guide from your link, you will see it
> linked at the top:
>
>     https://docs.kernel.org/rust/quick-start.html
>
> I also mentioned these in LPC's Kernel Summit track (sorry, no
> video/stream yet, as far as I understand):
> https://lpc.events/event/18/contributions/1912/
>
> > [ Provocative ]
> > Can I REALLY use a RUST-compiled Linux-kernel on BARE METAL?
> > Do I need special hardware?
> > Do you have a working in sense of bootable linux-config file?
> > ^^ This is a real question - not interested in any "technical preview".
> > ^^ You do NOT need to answer all this!
>
> I am not sure what you mean -- people has been using Linux with Rust
> enabled in real hardware for quite a while, e.g. Android and Asahi,
> plus others are upcoming (Fedora, as far as I know), and I regularly
> test in CI that the kernel boots in QEMU for several architectures and
> configs that we already have in-tree.
>

Asahi or Fedora-Asahi?
Do you have a link to a Linux-Live-System or maybe a pointer to a kernel-config?

> I also regularly test in CI that the kernel can be built with
> `rustup`'s binaries, with several distro toolchains and with Nathan's
> toolchains too.
>

Is it possible to download a built VM (rustup-binary) and test in QEMU
for example?

I have NO experiences with RUST - but it looks like things/development
moved further.

Before I wanted to test gendwarfksyms-v3 from Sami.

Best regards and wishes,
-sed@-