linux-kernel - Re: [PATCH v10 25/27] x86: enable initial Rust support

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Message-ID: <CAHk-=wiiBpw-0MKBbPkvo54=Cvyi0b3_1bDtqbgiD4ixd+OPow@mail.gmail.com>
Date:   Fri, 13 Oct 2023 12:22:02 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "H. Peter Anvin" <hpa@...or.com>
Cc:     Ramon de C Valle <rcvalle@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, patches@...ts.linux.dev,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...gle.com>,
        David Gow <davidgow@...gle.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Jonathan Corbet <corbet@....net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v10 25/27] x86: enable initial Rust support

On Fri, 13 Oct 2023 at 12:01, H. Peter Anvin <hpa@...or.com> wrote:
>
> Transparent unions have been standard C since C99.

Ahh, I didn't realize they made it into the standard.

In gcc, they've been usable for a lot longer (ie --std=gnu89 certainly
is happy with them), but the kernel never really picked up on them.

I think they've mainly been used by glibc for a couple of functions
that can take a couple of different types without complaining.

           Linus