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

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Message-ID: <YHoTc+5DGnvwwI0R@zeniv-ca.linux.org.uk>
Date:   Fri, 16 Apr 2021 22:45:07 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Willy Tarreau <w@....eu>
Cc:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Connor Kuehl <ckuehl@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Miguel Ojeda <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 Sat, Apr 17, 2021 at 12:04:16AM +0200, Willy Tarreau wrote:

> Yep but I kept it just to have comparable output code since in C
> you'd simply use "goto leave" and not have this function call to
> do the cleanup.

... or use any number of other technics; the real question was how
much of cleanups would be skipped by that syntax sugar.

IME anything that interacts with flow control should be as explicit
and unambiguous as possible.  _Especially_ concerning how large
a scope are we leaving.

There's a bunch of disciplines that make use of that kind of tools
and do it more or less safely, but they need to be well-specified
and very well understood.  And some tools (C++-style exceptions,
for example) simply need to be taken out and shot, but that's
a separate story^Wflamewar...