Commits on Jun 19, 2024

1. ci: Add Rust for Linux …

   Rust for Linux, so far, has pinned the Rust compiler and `bindgen`
   versions. The kernel is looking into expanding that support to several
   versions, i.e. establishing a minimum supported version, so that the
   kernel can start to be more easily built. In particular, it should be
   possible to build the kernel using the tools provided directly by Linux
   distributions. In order to help achieve that goal, the Rust project has
   added the kernel to its Rust pre-merge CI.
   
   This commit does the same for `bindgen`. In particular, it adds a quick,
   build-only test of the Rust code in the kernel as an extra step in the
   `test` workflow.
   
   This is intended to be an end-to-end test that runs what kernel
   developers/users would do. In particular, it is useful to catch certain
   issues that go beyond the C header comparisons. For instance, it would
   have been able to catch an issue like the `--version` option unexpectedly
   requiring a header in 0.69.0 (fixed in 0.69.1) [1].
   
   It would also have detected another issue present in 0.66.0 and 0.66.1:
   a panic handling certain C headers with string literals containing
   an interior NUL [2]. While the kernel is not really a stable test,
   and such an issue would still require that a proper test is added,
   it is nevertheless a good test case of non-trivial C headers that may
   trigger edge cases like that.
   
   Of course, `bindgen` may need to disable the test for different reasons,
   i.e. there is no expectation to block any urgent/important PR, and the
   kernel can also call `bindgen` differently depending on the version,
   i.e. we are happy to adjust on our side too. Even if it gets disabled
   often, we would still be in a better situation than not having the test
   at all.
   
   The Linux version (hash or tag) should ideally be updated from time to
   time (e.g. every kernel `-rc1`), and each update should only contain
   that change.
   
   Link: rust-lang#2678 [1]
   Link: rust-lang#2567 [2]
   Signed-off-by: Miguel Ojeda <[email protected]>

   

   ojeda committed Jun 19, 2024
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