Claude review: drm/panthor: Add a GEM shrinker

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

Overall Series Review

Subject: drm/panthor: Add a GEM shrinker
Author: Boris Brezillon <boris.brezillon@collabora.com>
Patches: 11
Reviewed: 2026-03-31T17:24:45.257645

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This is a well-structured 9-patch series adding GEM shrinker support to the panthor GPU driver. The series is at v6 and has already collected Reviewed-by from both Steven Price and Liviu Dudau on all patches. The approach is sound: first fork away from `drm_gem_shmem_object` to gain control over page lifetimes (patch 5), add lazy page allocation on mmap (patch 6), prepare the infrastructure (patches 7-8), then implement the shrinker itself (patch 9). The preparatory patches (1-4) are clean and low-risk.

The locking strategy (trylock everywhere in the reclaim path) is pragmatic given the lock ordering constraints. The tiered LRU approach (unused -> mmapped -> single-VM GPU mapped -> multi-VM GPU mapped) is reasonable. The series has clearly benefited from multiple review rounds and addresses prior concerns well.

A few items are worth attention, mostly in the large patch 9.

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