rust: sync: introduce `LockClassKey`
It is a wrapper around C's `lock_class_key`, which is used by the synchronisation primitives that are checked with lockdep. This is in preparation for introducing Rust abstractions for these primitives. Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Will Deacon <will@kernel.org> Cc: Waiman Long <longman@redhat.com> Reviewed-by:Martin Rodriguez Reboredo <yakoyoku@gmail.com> Co-developed-by:
Boqun Feng <boqun.feng@gmail.com> Signed-off-by:
Boqun Feng <boqun.feng@gmail.com> Signed-off-by:
Wedson Almeida Filho <walmeida@microsoft.com> Reviewed-by:
Gary Guo <gary@garyguo.net> Reviewed-by:
Benno Lossin <benno.lossin@proton.me> Link: https://lore.kernel.org/r/20230411054543.21278-1-wedsonaf@gmail.comSigned-off-by:
Miguel Ojeda <ojeda@kernel.org>
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