linux-kernel - Re: [PATCH] rust: kernel: drop repetition in offset

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Message-ID: <Y5z6YKNojBqoN5OD@liuwe-devbox-debian-v2>
Date:   Fri, 16 Dec 2022 23:08:16 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Wedson Almeida Filho <wedsonaf@...il.com>
Cc:     Wei Liu <wei.liu@...nel.org>, rust-for-linux@...r.kernel.org,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>
Subject: Re: [PATCH] rust: kernel: drop repetition in offset_of macro

On Fri, Dec 16, 2022 at 06:26:57PM +0000, Wedson Almeida Filho wrote:
> On Fri, 16 Dec 2022 at 17:49, Wei Liu <wei.liu@...nel.org> wrote:
> >
> > It doesn't make sense to allow multiple fields to be specified in
> > offset_of.
> 
> Why do you say it doesn't make sense?
> 
> Here's what I had in mind:
> ```
>     struct Y {
>         z: u32
>     }
>     struct X {
>         y: Y
>     }
>     offset_of!(X, y.z)
> ```
> 
> Which is something very plausible.

You're right. I didn't consider that use case. This patch can be
ignored.

Thanks,
Wei.