[PATCH v2 0/2] Miscdevices in Rust

[Alice Ryhl <aliceryhl@google.com>]

A misc device is generally the best place to start with your first Rust
driver, so having abstractions for miscdevice in Rust will be important
for our ability to teach Rust to kernel developers.

I intend to add a sample driver using these abstractions, and I also
intend to use it in Rust Binder to handle the case where binderfs is
turned off.

To avoid having a dependency on files, this patchset does not provide
the file operations callbacks a pointer to the file. This means that
they cannot check file properties such as O_NONBLOCK (which Binder
needs). Support for that can be added as a follow-up.

To avoid having a dependency on vma, this patchset does not provide any
way to implement mmap (which Binder needs). Support for that can be
added as a follow-up.

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
---
Changes in v2:
- Remove dependency on vma and file patchsets.
- Remove mmap, llseek, read_iter functions.
- Drop file position commit.
- Reword commit messages.
- Link to v1: https://lore.kernel.org/r/20240926-b4-miscdevice-v1-0-7349c2b2837a@google.com

---
Alice Ryhl (2):
      rust: types: add Opaque::try_ffi_init
      rust: miscdevice: add base miscdevice abstraction

 rust/bindings/bindings_helper.h |   1 +
 rust/kernel/lib.rs              |   1 +
 rust/kernel/miscdevice.rs       | 241 ++++++++++++++++++++++++++++++++++++++++
 rust/kernel/types.rs            |  16 +++
 4 files changed, 259 insertions(+)
---
base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc
change-id: 20240926-b4-miscdevice-29a0fd8438b1

Best regards,
-- 
Alice Ryhl <aliceryhl@google.com>