linux-kernel - Re: [PATCH] kcov: rust: add flags for KCOV with Rust

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Message-ID: <CAG_fn=VoGiRmeYZ=tN+e+R=6VU+piSkdzewwVGuVhfddSTzu3w@mail.gmail.com>
Date: Wed, 30 Apr 2025 18:15:31 +0200
From: Alexander Potapenko <glider@...gle.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>, Andrey Konovalov <andreyknvl@...il.com>, 
	Masahiro Yamada <masahiroy@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Miguel Ojeda <ojeda@...nel.org>, Nicolas Schier <nicolas.schier@...ux.dev>, 
	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@...nel.org>, 
	Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, 
	Aleksandr Nogikh <nogikh@...gle.com>, Nick Desaulniers <nick.desaulniers+lkml@...il.com>, 
	Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, kasan-dev@...glegroups.com, 
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, llvm@...ts.linux.dev, 
	Matthew Maurer <mmaurer@...gle.com>
Subject: Re: [PATCH] kcov: rust: add flags for KCOV with Rust

On Wed, Apr 30, 2025 at 10:04 AM 'Alice Ryhl' via kasan-dev
<kasan-dev@...glegroups.com> wrote:
>
> Rust code is currently not instrumented properly when KCOV is enabled.
> Thus, add the relevant flags to perform instrumentation correctly. This
> is necessary for efficient fuzzing of Rust code.
>
> The sanitizer-coverage features of LLVM have existed for long enough
> that they are available on any LLVM version supported by rustc, so we do
> not need any Kconfig feature detection.
>
> The coverage level is set to 3, as that is the level needed by trace-pc.
>
> Co-developed-by: Matthew Maurer <mmaurer@...gle.com>
> Signed-off-by: Matthew Maurer <mmaurer@...gle.com>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>