[PATCH v3 00/13] Quality of life improvements for pin-init

[Benno Lossin <benno.lossin@proton.me>]

This patch series adds several improvements to the pin-init api:
- a derive macro for the `Zeroable` trait,
- makes hygiene of fields in initializers behave like normal struct
  initializers would behave,
- prevent stackoverflow without optimizations
- add `..Zeroable::zeroed()` syntax to zero missing fields,
- support arbitrary paths in initializer macros.

It is based on the `rust-dev` branch.

This is the third version of this patch series.
- v2: https://lore.kernel.org/rust-for-linux/20230719141918.543938-1-benno.lossin@proton.me/
- v1: https://lore.kernel.org/rust-for-linux/20230624092330.157338-1-benno.lossin@proton.me/

Changes not present on modified commits:
v2 -> v3:
- make `#[pin_data]` work better with `#[cfg]` attributes on fields.

v1 -> v2:
- implement `Zeroable` for `Opaque`,
- remove blanket impl of `PinInit` for `Init` and make it a supertrait
  instead,
- add `{pin_}chain` functions to execute code after initialization,
- update the example macro expansion.

Benno Lossin (13):
  rust: init: consolidate init macros
  rust: init: make `#[pin_data]` compatible with conditional compilation
    of fields
  rust: add derive macro for `Zeroable`
  rust: init: make guards in the init macros hygienic
  rust: init: wrap type checking struct initializers in a closure
  rust: init: make initializer values inaccessible after initializing
  rust: init: add `..Zeroable::zeroed()` syntax for zeroing all missing
    fields
  rust: init: Add functions to create array initializers
  rust: init: add support for arbitrary paths in init macros
  rust: init: implement `Zeroable` for `UnsafeCell<T>` and `Opaque<T>`
  rust: init: make `PinInit<T, E>` a supertrait of `Init<T, E>`
  rust: init: add `{pin_}chain` functions to `{Pin}Init<T, E>`
  rust: init: update expanded macro explanation

 rust/kernel/init.rs            | 645 ++++++++++++++-------------------
 rust/kernel/init/__internal.rs |  39 +-
 rust/kernel/init/macros.rs     | 519 +++++++++++++++++++++++---
 rust/kernel/prelude.rs         |   2 +-
 rust/macros/lib.rs             |  20 +
 rust/macros/quote.rs           |   6 +
 rust/macros/zeroable.rs        |  72 ++++
 7 files changed, 850 insertions(+), 453 deletions(-)
 create mode 100644 rust/macros/zeroable.rs


base-commit: 65fba633fcdf8c4c15ddc24a21d8e55094607e33
-- 
2.41.0