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Date: Mon, 12 Feb 2024 20:17:31 +0000
From: Conor Dooley <conor@kernel.org>
To: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Cc: Ramon de C Valle <rcvalle@google.com>, Trevor Gross <tmgross@umich.edu>,
	Conor Dooley <conor.dooley@microchip.com>,
	linux-riscv@lists.infradead.org, Miguel Ojeda <ojeda@kernel.org>,
	Alex Gaynor <alex.gaynor@gmail.com>,
	Wedson Almeida Filho <wedsonaf@gmail.com>,
	Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>,
	=?iso-8859-1?Q?Bj=F6rn?= Roy Baron <bjorn3_gh@protonmail.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Tom Rix <trix@redhat.com>, rust-for-linux@vger.kernel.org,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	llvm@lists.linux.dev, Matthew Maurer <mmaurer@google.com>,
	Sami Tolvanen <samitolvanen@google.com>
Subject: Re: [PATCH v1 0/2] RISC-V: enable rust
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On Mon, Feb 12, 2024 at 08:11:21PM +0100, Miguel Ojeda wrote:
> On Mon, Feb 12, 2024 at 8:02=E2=80=AFPM Ramon de C Valle <rcvalle@google.=
com> wrote:
> >
> > Sorry for the late reply. Sami might be the best person to answer this,=
 but KCFI (not CFI) tests are lowered by passes that are architecture speci=
fic (see https://reviews.llvm.org/D119296), so we'd need to add support for=
 RISC-V. There is no additional work required in the Rust compiler besides =
enabling it for the new target.
>=20
> Thanks a lot Ramon!
>=20
> Then for RISC-V let's go for the `depends on` for the moment, and we
> can remove when the support lands for RISC-V (ideally when someone has
> managed to boot it at least under some configuration).

If all you want is a boot under some configuration, that's not
difficult. After all, I found the original issue by booting a kernel
with CFI_CLANG enabled on the C side...

> There is no additional work required in the Rust compiler besides enablin=
g it for the new target.

This is not super clear though, it says "in the Rust compiler", not "in
the kernel's buildsystem".

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