[PATCH v3 0/5] rust: add DropGuard

[Mohamed Osama]

Add the Rust kernel DropGuard API and migrate the existing ScopeGuard
users in the block, serdev, and locking code.

DropGuard runs a FnOnce callback when dropped and provides dismiss() to
take ownership of the wrapped value without running the cleanup callback.

Changes since v2:
- Clarified why DropGuard is added alongside the existing ScopeGuard.
- Fixed the core imports in mem.rs to follow the Rust kernel import style.

The series was previously tested with:
- make LLVM=1 rustfmtcheck
- make LLVM=1 rustdoc
- make LLVM=1 -j$(nproc)
- git diff --check
- scripts/checkpatch.pl

The changes in v3 are limited to the import style and commit-message
clarification.

Mohamed Osama (5):
  rust: add DropGuard KUnit test configuration
  rust: mem: add DropGuard
  rust: block: gen_disk: use DropGuard
  rust: serdev: use DropGuard
  rust: sync: lock: use DropGuard

 rust/kernel/Kconfig.test         |  10 +++
 rust/kernel/block/mq/gen_disk.rs |  11 +--
 rust/kernel/mem.rs               | 121 +++++++++++++++++++++++++++++++
 rust/kernel/serdev.rs            |  10 +--
 rust/kernel/sync/lock.rs         |   5 +-
 5 files changed, 144 insertions(+), 13 deletions(-)

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2.43.0