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From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Miguel Ojeda <ojeda@kernel.org>,
	Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	rust-for-linux <rust-for-linux@vger.kernel.org>,
	Linux Doc Mailing List <linux-doc@vger.kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Alex Gaynor <alex.gaynor@gmail.com>,
	Wedson Almeida Filho <wedsonaf@google.com>,
	Sven Van Asbroeck <thesven73@gmail.com>,
	Gary Guo <gary@garyguo.net>
Subject: Re: [PATCH 05/19] rust: add `compiler_builtins` crate
Date: Thu, 9 Dec 2021 20:34:00 +0100	[thread overview]
Message-ID: <CANiq72kUBy64D_psB2YsBs4evfyGUJO6g2eb5-5xZYg2rVETsw@mail.gmail.com> (raw)
In-Reply-To: <CAKwvOdk+A2PBdjSFVUhj4xyCGCKujtej1uPgywQgrKPiK2ksPw@mail.gmail.com>

On Wed, Dec 8, 2021 at 12:02 AM Nick Desaulniers
<ndesaulniers@google.com> wrote:
>
> Rather than panic at runtime, could we do some binary post processing
> in Kbuild with $(NM) to error the build if any of the below symbols
> are referenced from .o files produced by .rs sources?

To error the build, we only need to not define them; i.e. the issue is
passing the build. Eventually, we should be able to avoid defining
them (this is what the comment is referring to).

There are other ways around, like providing an in-tree `core`, but it
is best to see if upstream Rust can do it.

> If we provide definitions of these symbols, then I worry about C code
> that previously would have failed to link at build time when
> referencing these will now succeed at linking when CONFIG_RUST=y is
> enabled, but may panic at runtime IF we happen to hit those code
> paths.

It should be fine -- by the time we consider the Rust support
non-experimental, we should not be defining them.

Cheers,
Miguel

  reply	other threads:[~2021-12-09 19:34 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-06 14:02 [PATCH 00/19] Rust support Miguel Ojeda
2021-12-06 14:02 ` [PATCH 01/19] kallsyms: support "big" kernel symbols Miguel Ojeda
2021-12-06 14:18   ` Matthew Wilcox
2021-12-06 17:00     ` Miguel Ojeda
2021-12-06 14:02 ` [PATCH 02/19] kallsyms: increase maximum kernel symbol length to 512 Miguel Ojeda
2021-12-06 14:02 ` [PATCH 03/19] kallsyms: use the correct buffer size for symbols Miguel Ojeda
2021-12-06 14:02 ` [PATCH 04/19] rust: add C helpers Miguel Ojeda
2021-12-06 14:02 ` [PATCH 05/19] rust: add `compiler_builtins` crate Miguel Ojeda
2021-12-07 23:01   ` Nick Desaulniers
2021-12-09 19:34     ` Miguel Ojeda [this message]
2021-12-06 14:03 ` [PATCH 07/19] rust: add `build_error` crate Miguel Ojeda
2021-12-06 14:03 ` [PATCH 08/19] rust: add `macros` crate Miguel Ojeda
2021-12-06 14:03 ` [PATCH 10/19] rust: export generated symbols Miguel Ojeda
2021-12-06 14:03 ` [PATCH 11/19] vsprintf: add new `%pA` format specifier Miguel Ojeda
2021-12-06 15:02   ` Greg Kroah-Hartman
2021-12-06 15:56     ` Miguel Ojeda
2021-12-06 16:02       ` Greg Kroah-Hartman
2021-12-06 19:52         ` Nick Desaulniers
2021-12-06 19:55           ` Matthew Wilcox
2021-12-06 20:02             ` Nick Desaulniers
2021-12-06 14:03 ` [PATCH 12/19] scripts: add `generate_rust_analyzer.py` Miguel Ojeda
2021-12-06 14:03 ` [PATCH 13/19] scripts: decode_stacktrace: demangle Rust symbols Miguel Ojeda
2021-12-06 14:03 ` [PATCH 14/19] docs: add Rust documentation Miguel Ojeda
2021-12-08  1:29   ` Nick Desaulniers
2021-12-08 23:07     ` Miguel Ojeda
2021-12-06 14:03 ` [PATCH 15/19] Kbuild: add Rust support Miguel Ojeda
2021-12-07 22:45   ` Nick Desaulniers
2021-12-07 23:21     ` Nick Desaulniers
2021-12-07 23:25       ` Wedson Almeida Filho
2021-12-08  0:05         ` Nick Desaulniers
2021-12-08 22:52     ` Miguel Ojeda
2021-12-11 15:53   ` Masahiro Yamada
2022-01-17  4:45     ` Miguel Ojeda
2021-12-06 14:03 ` [PATCH 16/19] samples: add Rust examples Miguel Ojeda
2021-12-06 14:03 ` [PATCH 17/19] MAINTAINERS: Rust Miguel Ojeda
2021-12-06 14:03 ` [RFC PATCH 18/19] drivers: gpio: PrimeCell PL061 in Rust Miguel Ojeda
     [not found] ` <20211206140313.5653-20-ojeda@kernel.org>
2021-12-06 15:01   ` [RFC PATCH 19/19] drivers: android: Binder IPC " Greg Kroah-Hartman
2021-12-06 15:59     ` Wedson Almeida Filho
2021-12-06 16:02       ` Greg Kroah-Hartman

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