Claude review: drm/dumb-buffers: Increase size limits to match current devices

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Overall Series Review

Subject: drm/dumb-buffers: Increase size limits to match current devices
Author: Thomas Zimmermann <tzimmermann@suse.de>
Patches: 4
Reviewed: 2026-06-04T13:08:23.071360

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This is a single patch from Thomas Zimmermann that increases the hardcoded sanity limits for dumb buffer creation from 8192x8192 at 32bpp to 16384x16384 at 64bpp. It fixes commit `5ab62dd3687b` which introduced overly strict limits that broke CI and high-end devices (e.g., 64bpp formats like XRGB16161616F, and resolutions beyond 8K).

**The patch targets an older codebase.** On the current drm-next tree, the file has been significantly refactored — the hardcoded width/height/bpp limits this patch modifies have been entirely removed and replaced with proper overflow-safe arithmetic (`check_mul_overflow`, `DIV_ROUND_UP` with explicit `U32_MAX` bounds, and format-aware pitch calculation via `drm_mode_size_dumb()`). This explains why the patch does not apply cleanly.

This patch is likely intended for **stable backport** or an older branch where the refactoring hasn't landed yet. As a fix for the original limiting commit, the approach is reasonable.

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