From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
To: Greg KH <greg@kroah.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
Alex Gaynor <alex.gaynor@gmail.com>,
Carlos Llamas <cmllamas@google.com>, Finn Behrens <me@kloenk.de>,
Gary Guo <gary@garyguo.net>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Next Mailing List <linux-next@vger.kernel.org>,
Miguel Ojeda <ojeda@kernel.org>,
Sven Van Asbroeck <thesven73@gmail.com>,
Wayne Campbell <wcampbell1995@gmail.com>,
Wedson Almeida Filho <wedsonaf@google.com>,
Stephen Rothwell <sfr@canb.auug.org.au>
Subject: Re: linux-next: manual merge of the rust tree with the char-misc tree
Date: Mon, 16 May 2022 10:18:45 +0200 [thread overview]
Message-ID: <CANiq72mtirFqVr9eHnh9Y=nAbBZcNxspdLoWKzvwmvjHfvBQ4w@mail.gmail.com> (raw)
In-Reply-To: <YoIB8WCdgHr6Cp+z@kroah.com>
Hi Greg,
On Mon, May 16, 2022 at 9:49 AM Greg KH <greg@kroah.com> wrote:
>
> Odd, why does the Rust binder implementation require the IOCTL
> definitions to be in an enum instead of a #define?
It is because bindgen (the tool which generates the "raw" C bindings)
only works with simple C `#define`s. Thus there are two options when
one hits something like this: either copy-paste them manually into the
Rust side (which adds maintenance), or change them into real
objects/identifiers in the C side.
There may be support in the future for expanding macros that end up in
a numeric one: https://github.com/rust-lang/rust-bindgen/issues/753.
Stephen: the resolution looks fine, thanks!
> If that's required, I can take that type of change now to prevent merge
> issues in the future.
We have two so far: this one (for the RFC Android patch) and another
small one in include/linux/spinlock.h (for the `sync` module).
So far I have put those changes in their respective patches, but if
you prefer I can send them independently too (like the prerequisite
patches).
Cheers,
Miguel
next prev parent reply other threads:[~2022-05-16 8:19 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-16 7:13 linux-next: manual merge of the rust tree with the char-misc tree Stephen Rothwell
2022-05-16 7:49 ` Greg KH
2022-05-16 8:18 ` Miguel Ojeda [this message]
2022-05-16 8:27 ` Greg KH
-- strict thread matches above, loose matches on Subject: below --
2021-04-16 7:58 Stephen Rothwell
2021-04-16 8:10 ` Greg KH
2021-04-16 8:26 ` Stephen Rothwell
2021-04-16 12:31 ` Miguel Ojeda
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