[PATCH v2 0/3] rust: doctest: unify with other kunit tests

[Gary Guo <gary@garyguo.net>]

Currently in Rust, kunit tests are handled with `kunit_tests`, while the
doctests generate a lot `extern "C"` functions and invoke them through a
generated C wrapper.

This is currently needed because of the special treatment of file name and
line numbers from doctests. Convert them to override `file!()` and
`line!()` macro instead, and use them inside `kunit_assert!`.

With this it is possible to just generate `#[kunit_tests]` and `#[test]`
for doctests.

David mentioned in [1] that this should route via the Rust tree.

Link: https://lore.kernel.org/rust-for-linux/e30d16ec-f5a3-4cd8-9b25-96e0dfa8b9d2@davidgow.net/ [1]

Signed-off-by: Gary Guo <gary@garyguo.net>
---
Changes in v2:
- Rebased on v7.3-rc1
- Picked up tags
- Link to v1: https://patch.msgid.link/20260616-kunit-v1-0-b191604a8d6b@garyguo.net

---
Gary Guo (3):
      rust: kunit: use `file!()` inside `kunit_assert!`
      rust: kunit: use `line!()` inside `kunit_assert!`
      rust: doctest: generate Rust kunit test suites

 Documentation/rust/general-information.rst |  4 +-
 init/Kconfig                               |  3 --
 rust/Makefile                              |  4 +-
 rust/kernel/kunit.rs                       | 11 +++--
 rust/kernel/str.rs                         |  2 +-
 rust/macros/helpers.rs                     | 16 -------
 rust/macros/kunit.rs                       |  5 +-
 rust/macros/lib.rs                         |  5 --
 scripts/rustdoc_test_gen.rs                | 73 ++++++++----------------------
 9 files changed, 30 insertions(+), 93 deletions(-)
---
base-commit: cee9395acd8043be0644b25c34bfa86623f2b935
change-id: 20260616-kunit-348f2c029b1e

Best regards,
--  
Gary Guo <gary@garyguo.net>