linux-kernel - Re: [PATCH 00/13] [RFC] Rust support

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Message-ID: <CANiq72=LE64F9VDvr5aajeBNfXCvVK+yXN8m97jo-E6TDHNVbg@mail.gmail.com>
Date:   Fri, 16 Apr 2021 16:21:02 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        rust-for-linux@...r.kernel.org,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/13] [RFC] Rust support

On Fri, Apr 16, 2021 at 1:24 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> IMO RAII is over-valued, but just in case you care, the below seems to
> work just fine. No fancy new language needed, works today. Similarly you
> can create refcount_t guards, or with a little more work full blown
> smart_ptr crud.

Please note that even smart pointers (as in C++'s `std::unique_ptr`
etc.) do not guarantee memory safety. Yes, they help a lot writing
sound code (in particular exception-safe C++ code), but they do not
bring the same guarantees.

That's why using C language extensions (the existing ones, that is) to
recreate RAII/guards, smart pointers, etc. would only bring you to a
point closer to C++, but not to Rust.

Cheers,
Miguel