linux-kernel - Re: [PATCH v9 12/27] rust: add `kernel` crate

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Date:   Sat, 6 Aug 2022 13:22:52 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Konstantin Shelekhin <k.shelekhin@...ro.com>
Cc:     ojeda@...nel.org, alex.gaynor@...il.com, ark.email@...il.com,
        bjorn3_gh@...tonmail.com, bobo1239@....de, bonifaido@...il.com,
        boqun.feng@...il.com, davidgow@...gle.com, dev@...lasmohrin.de,
        dsosnowski@...snowski.pl, foxhlchen@...il.com, gary@...yguo.net,
        geofft@...reload.com, gregkh@...uxfoundation.org,
        jarkko@...nel.org, john.m.baublitz@...il.com,
        leseulartichaut@...il.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, m.falkowski@...sung.com,
        me@...enk.de, milan@...verde.com, mjmouse9999@...il.com,
        patches@...ts.linux.dev, rust-for-linux@...r.kernel.org,
        thesven73@...il.com, torvalds@...ux-foundation.org,
        viktor@...ar.de, wedsonaf@...gle.com,
        Andreas Hindborg <andreas.hindborg@....com>
Subject: Re: [PATCH v9 12/27] rust: add `kernel` crate

On Sat, Aug 6, 2022 at 12:25 PM Konstantin Shelekhin
<k.shelekhin@...ro.com> wrote:
>
> I sense possible problems here. It's common for a kernel code to pass
> flags during memory allocations.

Yes, of course. We will support this, but how exactly it will look
like, to what extent upstream Rust's `alloc` could support our use
cases, etc. has been on discussion for a long time.

For instance, see https://github.com/Rust-for-Linux/linux/pull/815 for
a potential extension trait approach with no allocator carried on the
type that Andreas wrote after a discussion in the last informal call:

    let a = Box::try_new_atomic(101)?;

Cheers,
Miguel