Claude review: drm/buddy: Documentation and internal helper cleanup

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

Overall Series Review

Subject: drm/buddy: Documentation and internal helper cleanup
Author: Sanjay Yadav <sanjay.kumar.yadav@intel.com>
Patches: 3
Reviewed: 2026-02-11T16:07:51.694362

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This v2 patch series improves the GPU buddy allocator by adding comprehensive kernel-doc documentation and cleaning up the internal API surface. The series addresses feedback from v1, including correcting documentation for tree index values and adapting to the recent code relocation to `drivers/gpu/`.

**Series Structure:** The two-patch split is logical - documentation additions first, followed by code cleanup. This ordering makes sense as it documents the API before narrowing it.

**Scope:** The series claims "No functional changes" which appears accurate. The changes are purely documentation and code organization improvements.

**Version Changes:** The v2 changelog indicates:
- Rebase after DRM buddy allocator moved to `drivers/gpu/`
- Retained `gpu_buddy_block_is_free()` in header (now used by `drm_buddy.c`)
- Fixed tree index documentation (responding to Arun's feedback)

**Review Status:** Patch 2/2 already has `Reviewed-by: Arunpravin Paneer Selvam`.

**Concerns:**
1. The series references `drm_buddy.c` using `gpu_buddy_block_is_free()`, but this file isn't shown in the diff context. Need to verify this external dependency.
2. The header bit layout documentation in Patch 1 should be verified against actual usage.

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