Claude review: drm/sched: Add test suite for concurrent job submissions

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Overall Series Review

Subject: drm/sched: Add test suite for concurrent job submissions
Author: Marco Pagani <marco.pagani@linux.dev>
Patches: 7
Reviewed: 2026-04-12T12:16:53.731140

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This is a single patch (v2) that adds a new KUnit test suite for concurrent job submissions to the DRM GPU scheduler. The patch is well-structured and addresses a genuine gap in test coverage — the existing tests all submit jobs from a single thread, whereas real GPU workloads involve concurrent submissions from multiple userspace contexts.

The patch introduces two test cases: (1) parallel bulk submission followed by manual timeline advance, and (2) interleaved submission with automatic duration-based completion using a sliding window. Both are parameterized, though each currently has only a single parameter set.

The code is generally clean and follows reasonable patterns. It introduces `KUNIT_DEFINE_ACTION_WRAPPER` and `kunit_add_action_or_reset` for cleanup, which is a departure from the existing `init`/`exit` pattern used by the other suites in this file, but is arguably better suited for the more complex resource lifecycle in concurrent tests. There are a few issues worth discussing.

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