Re: [PATCH 2/2] drm/tests/drm_buddy: Add tests for allocations exceeding max_order

[Matthew Auld <matthew.auld@intel.com>]

On 22/12/2025 06:52, Sanjay Yadav wrote:
> Add kunit tests that exercise edge cases where allocation requests
> exceed mm->max_order after rounding. This can happen with
> non-power-of-two VRAM sizes when the allocator rounds up requests.
> 
> For example, with 10G VRAM (8G + 2G roots), mm->max_order represents
> the 8G block. A 9G allocation can round up to 16G in multiple ways:
> CONTIGUOUS allocation rounds to next power-of-two, or non-CONTIGUOUS
> with 8G min_block_size rounds to next alignment boundary.
> 
> The test validates CONTIGUOUS and RANGE flag combinations, ensuring that
> only CONTIGUOUS-alone allocations use try_harder fallback, while other
> combinations return -EINVAL when rounded size exceeds memory, preventing
> BUG_ON assertions.
> 
> Cc: Christian König <christian.koenig@amd.com>
> Cc: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
> Suggested-by: Matthew Auld <matthew.auld@intel.com>
> Signed-off-by: Sanjay Yadav <sanjay.kumar.yadav@intel.com>

Reviewed-by: Matthew Auld <matthew.auld@intel.com>