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

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Message-ID: <CAH5fLgiCLxe3bjHtf3frY3vOsYucu4cFDtDR1UUZYXCGwxLv8w@mail.gmail.com>
Date: Thu, 25 Jul 2024 11:43:28 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Miguel Ojeda <ojeda@...nel.org>
Cc: Josh Poimboeuf <jpoimboe@...nel.org>, Peter Zijlstra <peterz@...radead.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>, 
	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 6:15 PM Miguel Ojeda <ojeda@...nel.org> 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.
>
> Testing is very welcome for this one!

Verified that this eliminates the relevant warnings in an x86 build of
the android-mainline kernel.

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