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    Subject[PATCH 08/13] Rust: Export generated symbols
    Date
    From: Miguel Ojeda <ojeda@kernel.org>

    Now that all the shared Rust infrastructure is in, we export all
    the symbols reusing the `EXPORT_SYMBOL_GPL` macro from C. The lists
    of symbols are generated on the fly when compiling the crates.

    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: Geoffrey Thomas <geofft@ldpreload.com>
    Signed-off-by: Geoffrey Thomas <geofft@ldpreload.com>
    Co-developed-by: Finn Behrens <me@kloenk.de>
    Signed-off-by: Finn Behrens <me@kloenk.de>
    Co-developed-by: Adam Bratschi-Kaye <ark.email@gmail.com>
    Signed-off-by: Adam Bratschi-Kaye <ark.email@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/Makefile | 2 ++
    rust/exports.c | 16 ++++++++++++++++
    2 files changed, 18 insertions(+)
    create mode 100644 rust/exports.c

    diff --git a/rust/Makefile b/rust/Makefile
    index dbbbdbad6941..2d1d9d7af77c 100644
    --- a/rust/Makefile
    +++ b/rust/Makefile
    @@ -9,6 +9,8 @@ extra-$(CONFIG_RUST) += bindings_generated.rs
    obj-$(CONFIG_RUST) += alloc.o kernel.o
    extra-$(CONFIG_RUST) += exports_alloc_generated.h exports_kernel_generated.h

    +obj-$(CONFIG_RUST) += exports.o
    +
    RUSTDOC = rustdoc

    quiet_cmd_rustdoc = RUSTDOC $<
    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"
    --
    2.17.1
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