Claude review: drm/i915/gem: update outdated comment

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

Patch Review

**Correctness:** The patch is correct.

- `set_engines()` is confirmed to no longer exist in `i915_gem_context.c`.
- The `engines_mutex` lock at line 1520 is still needed because `i915_gem_context_lock_engines()` (defined in `i915_gem_context.h:190`) and callers such as `i915_gem_throttle.c:61` access `ctx->engines` under this mutex concurrently.
- The replacement comment `/* Serialize against concurrent access to the context's engines */` accurately describes the purpose of the lock.

**Minor notes:**

1. The `Assisted-by: unnamed:deepseek-v3.2 coccinelle` tag is non-standard. Typically `Assisted-by` is not an established kernel tag (the recognized ones are things like `Suggested-by`, `Reported-by`, etc.). The maintainer may want the author to either drop this tag or use a more standard format. Additionally, listing "coccinelle" alongside an AI model name is confusing since Coccinelle is a separate tool — it's unclear what role each played in a comment-only change.

2. The commit message is well-written and provides good justification for why the lock is retained even though `set_engines()` is gone.

**Verdict:** Looks good to merge, modulo the non-standard tag. The code change itself is a clear improvement.

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Generated by Claude Code Patch Reviewer