linux-kernel - Re: [PATCH 04/13] Kbuild: Rust support

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Message-ID: <CAHk-=wh_zb=K1B-N8mgHmSZDqTLgOm711NRXbTX_OwFAzDYg0Q@mail.gmail.com>
Date:   Fri, 16 Apr 2021 10:05:18 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     ojeda@...nel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        rust-for-linux@...r.kernel.org,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Geoffrey Thomas <geofft@...reload.com>,
        Finn Behrens <me@...enk.de>,
        Adam Bratschi-Kaye <ark.email@...il.com>,
        Wedson Almeida Filho <wedsonaf@...gle.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH 04/13] Kbuild: Rust support

On Fri, Apr 16, 2021 at 6:38 AM Peter Zijlstra <peterz@...radead.org> wrote:
>
> AFAICT rust has try/throw/catch exception handling (like
> C++/Java/others) which is typically implemented with stack unwinding of
> its own.

I was assuming that the kernel side would never do that.

There's some kind of "catch_unwind()" thing that catches a Rust
"panic!" thing, but I think it's basically useless for the kernel.

Typical Rust error handling should match the regular kernel
IS_ERR/ERR_PTR/PTR_ERR model fairly well, although the syntax is
fairly different (and it's not limited to pointers).

                Linus