linux-kernel - Re: [PATCH v2 16/19] gendwarfksyms: Add support for reserved structure fields

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Message-ID: <CABCJKudN7vGB1gfGDuEArdkH9DL4iPFw3DXMPrX1ZLzPRp8+3w@mail.gmail.com>
Date: Wed, 21 Aug 2024 16:01:08 -0700
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Benno Lossin <benno.lossin@...ton.me>
Cc: Matthew Maurer <mmaurer@...gle.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Masahiro Yamada <masahiroy@...nel.org>, Luis Chamberlain <mcgrof@...nel.org>, 
	Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Wedson Almeida Filho <wedsonaf@...il.com>, Gary Guo <gary@...yguo.net>, Petr Pavlu <petr.pavlu@...e.com>, 
	Neal Gompa <neal@...pa.dev>, Hector Martin <marcan@...can.st>, Janne Grunau <j@...nau.net>, 
	Asahi Linux <asahi@...ts.linux.dev>, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-modules@...r.kernel.org, 
	rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v2 16/19] gendwarfksyms: Add support for reserved
 structure fields

On Wed, Aug 21, 2024 at 4:31 AM Benno Lossin <benno.lossin@...ton.me> wrote:
>
> On 20.08.24 22:03, Matthew Maurer wrote:
> >>> The way `KAbiReserved` is implemented is via a `union` (maybe a bit
> >>> ironic, considering what I said in my other replies, but in this case,
> >>> we would provide a safe abstraction over this `union`, thus avoiding
> >>> exposing users of this type to `unsafe`):
> >>>
> >>>     #[repr(C)]
> >>>     pub union KAbiReserved<T, R> {
> >>>         value: T,
> >>>         _reserved: R,
> >>>     }
> >>
> >> I like this approach even better, assuming any remaining issues with
> >> ownership etc. can be sorted out. This would also look identical to
> >> the C version in DWARF if you rename _reserved in the union to
> >> __kabi_reserved. Of course, we can always change gendwarfksyms to
> >> support a different scheme for Rust code if a better solution comes
> >> along later.
>
> Yeah sure, that should also then work directly with this patch, right?

Yes, this would work without changes.

Sami