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From: Miguel Ojeda <ojeda@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: rust-for-linux@vger.kernel.org, linux-kbuild@vger.kernel.org,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	Miguel Ojeda <ojeda@kernel.org>,
	Alex Gaynor <alex.gaynor@gmail.com>,
	Wedson Almeida Filho <wedsonaf@google.com>
Subject: [PATCH v3 10/19] rust: export generated symbols
Date: Mon, 17 Jan 2022 06:33:40 +0100	[thread overview]
Message-ID: <20220117053349.6804-11-ojeda@kernel.org> (raw)
In-Reply-To: <20220117053349.6804-1-ojeda@kernel.org>

All symbols are reexported reusing the `EXPORT_SYMBOL_GPL` macro
from C. The lists of symbols are generated on the fly.

There are three main sets of symbols to distinguish:

  - The ones from the `core` and `alloc` crates (from the Rust
    standard library). The code is licensed as Apache/MIT.

  - The ones from our abstractions in the `kernel` crate.

  - The helpers (already exported since they are not generated).

We export everything as GPL. This ensures we do not mistakenly
expose GPL kernel symbols/features as non-GPL, even indirectly.

Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com>
Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com>
Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 rust/exports.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 rust/exports.c

diff --git a/rust/exports.c b/rust/exports.c
new file mode 100644
index 000000000000..d7dff1b3b919
--- /dev/null
+++ b/rust/exports.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// A hack to export Rust symbols for loadable modules without having to redo
+// the entire `include/linux/export.h` logic in Rust.
+//
+// This requires the Rust's new/future `v0` mangling scheme because the default
+// one ("legacy") uses invalid characters for C identifiers (thus we cannot use
+// the `EXPORT_SYMBOL_*` macros).
+
+#include <linux/module.h>
+
+#define EXPORT_SYMBOL_RUST_GPL(sym) extern int sym; EXPORT_SYMBOL_GPL(sym);
+
+#include "exports_core_generated.h"
+#include "exports_alloc_generated.h"
+#include "exports_kernel_generated.h"
-- 
2.34.1


  parent reply	other threads:[~2022-01-17  5:34 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-17  5:33 [PATCH v3 00/19] Rust support Miguel Ojeda
2022-01-17  5:33 ` [PATCH v3 01/19] kallsyms: support "big" kernel symbols Miguel Ojeda
2022-01-17  5:33 ` [PATCH v3 02/19] kallsyms: increase maximum kernel symbol length to 512 Miguel Ojeda
2022-01-17  5:33 ` [PATCH v3 03/19] kallsyms: use the correct buffer size for symbols Miguel Ojeda
2022-01-17  5:33 ` [PATCH v3 04/19] rust: add C helpers Miguel Ojeda
2022-01-17  5:33 ` [PATCH v3 05/19] rust: add `compiler_builtins` crate Miguel Ojeda
2022-01-17  5:33 ` [PATCH v3 07/19] rust: add `build_error` crate Miguel Ojeda
2022-01-17  5:33 ` [PATCH v3 08/19] rust: add `macros` crate Miguel Ojeda
2022-01-17  5:33 ` Miguel Ojeda [this message]
2022-01-17  5:33 ` [PATCH v3 11/19] vsprintf: add new `%pA` format specifier Miguel Ojeda
2022-01-17  5:33 ` [PATCH v3 12/19] scripts: add `generate_rust_analyzer.py` Miguel Ojeda
2022-01-17  5:33 ` [PATCH v3 13/19] scripts: decode_stacktrace: demangle Rust symbols Miguel Ojeda
2022-01-17  5:33 ` [PATCH v3 14/19] docs: add Rust documentation Miguel Ojeda
2022-01-18 22:33   ` Jonathan Corbet
2022-01-19 13:58     ` Miguel Ojeda
2022-01-17  5:33 ` [PATCH v3 15/19] Kbuild: add Rust support Miguel Ojeda
2022-01-17  5:33 ` [PATCH v3 16/19] samples: add Rust examples Miguel Ojeda
2022-01-17  5:33 ` [PATCH v3 17/19] MAINTAINERS: Rust Miguel Ojeda
2022-01-17  5:33 ` [RFC PATCH v3 18/19] drivers: gpio: PrimeCell PL061 in Rust Miguel Ojeda

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