rust: lock: Add a Pin<&mut T> accessor
In order for callers to be able to access the inner T safely if T:
!Unpin, there needs to be a way to get a Pin<&mut T>. Add this accessor
and a corresponding example to tell users how it works.
This requires the pin projection functionality [1] for better ergonomic.
Link: https://github.com/Rust-for-Linux/linux/issues/1181
Link: https://lore.kernel.org/rust-for-linux/20250912174148.373530-1-lossin@kernel.org/ [1]
Suggested-by: Benno Lossin <lossin@kernel.org>
Suggested-by: Boqun Feng <boqun.feng@gmail.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Daniel Almeida <daniel.almeida@collabora.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
[boqun: Apply Daniel's fix to the code example, add the reference to pin
projection patch and remove out-of-date part in the commit log]
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Notes:
SubmissionLink: https://lore.kernel.org/all/20250828-lock-t-when-t-is-pinned-v2-3-b067c4b93fd6@collabora.com/
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