linux-kernel - Re: [PATCH v2 2/3] scripts: generate_rust

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Date: Tue, 27 Feb 2024 12:36:23 +0000
From: Conor Dooley <conor.dooley@...rochip.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
CC: Conor Dooley <conor@...nel.org>, <linux-riscv@...ts.infradead.org>, Miguel
 Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida
 Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo
	<gary@...yguo.net>, Björn Roy Baron
	<bjorn3_gh@...tonmail.com>, Jonathan Corbet <corbet@....net>, Paul Walmsley
	<paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, Nathan
 Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>,
	Tom Rix <trix@...hat.com>, <rust-for-linux@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<llvm@...ts.linux.dev>
Subject: Re: [PATCH v2 2/3] scripts: generate_rust_target: enable building on
 RISC-V

On Tue, Feb 27, 2024 at 01:12:51PM +0100, Miguel Ojeda wrote:
> On Tue, Feb 27, 2024 at 12:05 PM Conor Dooley
> <conor.dooley@...rochip.com> wrote:
> >
> > My point though was more
> > that either this was acceptable for v6.9 or would be v6.10 material
> > with the same mechanism as arm64. Rebasing after v6.9-rc1 but not
> > adapting to that way of doing things is what seemed silly to me, since
> > if a resend is required then the other improvements should be carried
> > out at the same time.
> 
> If avoiding the `target.json` is possible, definitely.
> 
> I didn't want to assume it is, though -- e.g. the native integer
> widths you have is 64 but the built-in targets use 32:64 (perhaps
> there is a way to tweak it with an LLVM param via `-Cllvm-args`, but I
> don't see any obvious way from a quick look; `opt` does have it,
> though).

Looking closer at those targets, all of them enable compressed
instructors, but we support hardware that does not support them.
I think that means we are stuck with the custom targets.

I could badger Palmer to pick this up tomorrow, provided you're okay
with the gist of this series.

Cheers,
Conor.

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