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rust: lockdep: Use Pin for all LockClassKey usages

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Reintroduce dynamically-allocated LockClassKeys such that they are
automatically (de)registered. Require that all usages of LockClassKeys
ensure that they are Pin'd.

Currently, only `'static` LockClassKeys are supported, so Pin is
redundant. However, it is intended that dynamically-allocated
LockClassKeys will eventually be supported, so using Pin from the outset
will make that change simpler.

Closes: https://github.com/Rust-for-Linux/linux/issues/1102
Suggested-by: Benno Lossin <benno.lossin@proton.me>
Suggested-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Mitchell Levy <levymitchell0@gmail.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20250307232717.1759087-12-boqun.feng@gmail.com
This commit is contained in:
Mitchell Levy
2025-03-07 15:27:01 -08:00
committed by Ingo Molnar
parent 70b9c8563c
commit f73ca66f0d
8 changed files with 77 additions and 12 deletions
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2
rust/kernel/workqueue.rs
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@@ -369,7 +369,7 @@ unsafe impl<T: ?Sized, const ID: u64> Sync for Work<T, ID> {}
impl<T: ?Sized, const ID: u64> Work<T, ID> {
/// Creates a new instance of [`Work`].
#[inline]
pub fn new(name: &'static CStr, key: &'static LockClassKey) -> impl PinInit<Self>
pub fn new(name: &'static CStr, key: Pin<&'static LockClassKey>) -> impl PinInit<Self>
where
T: WorkItem<ID>,
{