Re: [PATCH 6.6.y] rust: lockdep: Remove support for dynamically allocated LockClassKeys

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

Summary of potential issues:
⚠️ Found matching upstream commit but patch is missing proper reference to it

Found matching upstream commit: 966944f3711665db13e214fef6d02982c49bb972

WARNING: Author mismatch between patch and found commit:
Backport author: Boqun Feng<boqun.feng@gmail.com>
Commit author: Mitchell Levy<levymitchell0@gmail.com>

Status in newer kernel trees:
6.13.y | Present (different SHA1: 3e5d366aabae)
6.12.y | Present (different SHA1: c5b195dd9564)

Note: The patch differs from the upstream commit:
---
1:  966944f371166 ! 1:  b037a70e0eccb rust: lockdep: Remove support for dynamically allocated LockClassKeys
    @@ Commit message
         Reviewed-by: Benno Lossin <benno.lossin@proton.me>
         Cc: stable@vger.kernel.org
         Link: https://lore.kernel.org/r/20250307232717.1759087-11-boqun.feng@gmail.com
    +    (cherry picked from commit 966944f3711665db13e214fef6d02982c49bb972)
    +    Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
     
      ## rust/kernel/sync.rs ##
     @@
    @@ rust/kernel/sync.rs
          pub(crate) fn as_ptr(&self) -> *mut bindings::lock_class_key {
              self.0.get()
          }
    - }
    - 
    --impl Default for LockClassKey {
    --    fn default() -> Self {
    --        Self::new()
    --    }
    --}
    --
    - /// Defines a new static lock class and returns a pointer to it.
    - #[doc(hidden)]
    +@@ rust/kernel/sync.rs: pub(crate) fn as_ptr(&self) -> *mut bindings::lock_class_key {
      #[macro_export]
      macro_rules! static_lock_class {
          () => {{
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.6.y        |  Success    |  Success   |