linux-kernel - Re: [PATCH] kbuild: rust: remove unneeded `@...tc

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Date: Mon, 22 Apr 2024 11:25:45 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Miguel Ojeda <ojeda@...nel.org>
Cc: Masahiro Yamada <masahiroy@...nel.org>, Wedson Almeida Filho <wedsonaf@...il.com>, 
	Alex Gaynor <alex.gaynor@...il.com>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Nicolas Schier <nicolas@...sle.eu>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...sung.com>, 
	David Gow <davidgow@...gle.com>, Brendan Higgins <brendan.higgins@...ux.dev>, 
	linux-kbuild@...r.kernel.org, rust-for-linux@...r.kernel.org, 
	kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org, 
	linux-kernel@...r.kernel.org, patches@...ts.linux.dev, stable@...r.kernel.org
Subject: Re: [PATCH] kbuild: rust: remove unneeded `@...tc_cfg` to avoid ICE

On Mon, Apr 22, 2024 at 11:13 AM Miguel Ojeda <ojeda@...nel.org> wrote:
>
> When KUnit tests are enabled, under very big kernel configurations
> (e.g. `allyesconfig`), we can trigger a `rustdoc` ICE [1]:
>
>       RUSTDOC TK rust/kernel/lib.rs
>     error: the compiler unexpectedly panicked. this is a bug.
>
> The reason is that this build step has a duplicated `@...tc_cfg` argument,
> which contains the kernel configuration, and thus a lot of arguments. The
> factor 2 happens to be enough to reach the ICE.
>
> Thus remove the unneeded `@...tc_cfg`. By doing so, we clean up the
> command and workaround the ICE.
>
> The ICE has been fixed in the upcoming Rust 1.79 [2].
>
> Cc: stable@...r.kernel.org
> Fixes: a66d733da801 ("rust: support running Rust documentation tests as KUnit ones")
> Link: https://github.com/rust-lang/rust/issues/122722 [1]
> Link: https://github.com/rust-lang/rust/pull/122840 [2]
> Signed-off-by: Miguel Ojeda <ojeda@...nel.org>

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>