[PATCH v5 0/7] Additional methods for Vec

[Alice Ryhl <aliceryhl@google.com>]

This adds various Vec methods. Some of them are needed by Rust Binder,
and others are needed in other places. Each commit explains where it is
needed.

This series is based on top of alloc-next and rust: alloc: split
`Vec::set_len` into `Vec::{inc,dec}_len`
https://lore.kernel.org/rust-for-linux/20250416-vec-set-len-v4-0-112b222604cd@gmail.com/

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
---
Changes in v5:
- Replace panics with errors.
- Avoid variable for length in drain_all.
- Link to v4: https://lore.kernel.org/r/20250429-vec-methods-v4-0-dad4436ff82d@google.com

Changes in v4:
- Add missing ? in some doc tests.
- Fix safety comment in Vec::push_within_capacity.
- Add panics section to Vec::remove docs.
- Move self.dec_len(1) to end of Vec::remove.
- Add kunit test for Vec::retain.
- Link to v3: https://lore.kernel.org/r/20250422-vec-methods-v3-0-deff5eea568a@google.com

Changes in v3:
- Rebase on split `Vec::set_len` into `Vec::{inc,dec}_len`.
- Various modifications to work with inc/dec_len instead of set_len,
  with some Reviewed-by's dropped due to this.
- Move push_within_capacity impl into an unchecked variant.
- Link to v2: https://lore.kernel.org/r/20250321-vec-methods-v2-0-6d9c8a4634cb@google.com

Changes in v2:
- Add two more methods that I needed.
- Introduce some uses of set_len.
- Add example to retain.
- Simplify pop.
- Adjust 11 to 10 in push_within_capacity example.
- Link to v1: https://lore.kernel.org/r/20250320-vec-methods-v1-0-7dff5cf25fe8@google.com

---
Alice Ryhl (7):
      rust: alloc: add Vec::clear
      rust: alloc: add Vec::pop
      rust: alloc: add Vec::push_within_capacity
      rust: alloc: add Vec::drain_all
      rust: alloc: add Vec::retain
      rust: alloc: add Vec::remove
      rust: alloc: add Vec::insert_within_capacity

 rust/kernel/alloc/kvec.rs        | 315 ++++++++++++++++++++++++++++++++++++++-
 rust/kernel/alloc/kvec/errors.rs |  61 ++++++++
 2 files changed, 373 insertions(+), 3 deletions(-)
---
base-commit: 88d5d6a38d5161228fbfe017eb94d777d5e8a0e4
change-id: 20250320-vec-methods-adfa41e55311

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