Claude review: ForLt/CovariantForLt split, auxiliary closure API and DevresLt

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Overall Series Review

Subject: ForLt/CovariantForLt split, auxiliary closure API and DevresLt
Author: Danilo Krummrich <dakr@kernel.org>
Patches: 11
Reviewed: 2026-06-04T12:08:38.911660

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This is a well-designed series that splits the existing `ForLt` trait into a two-level hierarchy to support both covariant and invariant lifetime-parameterized types in the kernel's device resource management infrastructure. The motivation is clear: types like `Mutex<&'bound T>` are invariant over their lifetime parameter and cannot safely use `cast_ref()`, but they still need to participate in the `Devres`/registration-data patterns.

The series is cleanly structured: rename first, introduce the base trait, add the closure-based API, demonstrate it in a sample, then build `DevresLt` on top, and finally convert the concrete types. The safety arguments are sound — the HRTB closure pattern (`for<'a> FnOnce(...)`) is a well-established technique for preventing lifetime smuggling with invariant types.

No correctness bugs found. A few minor observations follow.

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