linux-kernel - Re: [PATCH v2 0/6] Rust: support `CPU

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Message-ID: <20240725083836.GE13387@noisy.programming.kicks-ass.net>
Date: Thu, 25 Jul 2024 10:38:36 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Miguel Ojeda <ojeda@...nel.org>
Cc: Josh Poimboeuf <jpoimboe@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Masahiro Yamada <masahiroy@...nel.org>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>,
	Wedson Almeida Filho <wedsonaf@...il.com>,
	Alex Gaynor <alex.gaynor@...il.com>,
	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>,
	Alice Ryhl <aliceryhl@...gle.com>, rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH v2 0/6] Rust: support `CPU_MITIGATIONS` and enable
 `objtool`

On Wed, Jul 24, 2024 at 06:14:53PM +0200, Miguel Ojeda wrote:
> Hi,
> 
> This is an updated series to the CPU mitigations support for Rust. It
> also has the patch to enable `objtool`, so that we can start running it
> for Rust.
> 
> It would be nice to get this applied soon, so that we start being
> warning-free (since we already get warnings under IBT builds via
> `vmlinux.o`). I am happy to take it through the Rust tree if the x86 and
> objtool maintainers give an Acked-by, or through any of the other trees,
> as you prefer. Otherwise, I think at this point we would need to make
> Rust exclusive to the mitigations, which isn't great.
> 
> With this series, again, x86_64 is warning-free with `objtool` enabled. I
> tested `-O2`/`-Os` and the Rust versions we support under `-O2` (mainly
> for the `noreturn` patch, which uses heuristics), as well as IBT vs. no
> IBT (i.e.  running on individual object files vs. in `vmlinux`). I also
> did an arm64 build.

W00t :-)

Aside from a small niggle about maybe doing a helper function for those
Rust runtime things, I don't see anything objectionable here.

Thanks!