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    Subject[PATCH v9 13/27] rust: export generated symbols
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    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>
    Co-developed-by: Björn Roy Baron <bjorn3_gh@protonmail.com>
    Signed-off-by: Björn Roy Baron <bjorn3_gh@protonmail.com>
    Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
    ---
    rust/exports.c | 21 +++++++++++++++++++++
    1 file changed, 21 insertions(+)
    create mode 100644 rust/exports.c

    diff --git a/rust/exports.c b/rust/exports.c
    new file mode 100644
    index 000000000000..bb7cc64cecd0
    --- /dev/null
    +++ b/rust/exports.c
    @@ -0,0 +1,21 @@
    +// 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).
    + *
    + * All symbols are exported as GPL-only to guarantee no GPL-only feature is
    + * accidentally exposed.
    + */
    +
    +#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_bindings_generated.h"
    +#include "exports_kernel_generated.h"
    --
    2.37.1
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