Claude review: kunit: Add support for suppressing warning backtraces

[Claude Code Review Bot <claude-review@example.com>]

Overall Series Review

Subject: kunit: Add support for suppressing warning backtraces
Author: Albert Esteve <aesteve@redhat.com>
Patches: 7
Reviewed: 2026-05-16T10:56:13.154192

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This is v11 of a well-iterated 4-patch series adding KUnit warning backtrace suppression, authored by Alessandro Carminati and Guenter Roeck, shepherded by Albert Esteve. The design is solid: it integrates into the existing KUnit hooks infrastructure, uses task-scoped suppression (avoiding fragile function-name matching), provides both scoped and direct APIs, and has good test coverage including cross-kthread isolation testing.

The series has multiple Reviewed-by/Acked-by tags from KUnit maintainer David Gow, Kees Cook, Dan Carpenter, and Maira Canal, indicating thorough upstream review. The architecture is clean: zero overhead when KUnit isn't running (via static branch), RCU for readers, spinlock for writers, and kunit_kzalloc/kunit_add_action for lifecycle management.

**Key concerns are minor at this stage.** The series looks ready to merge from the DRM perspective (patch 3), and the core infrastructure (patches 1-2) have the necessary KUnit maintainer sign-offs.

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