Re: [PATCH 2/3] drm/amdgpu: fix VM update overrun on non-4K page kernels

[Junrui Luo]

On Thu, Aug 06, 2026 at 01:59:52PM +0200, Christian König wrote:
> 
> That check is clearly not correct. The pages_addr must be fully consumed, otherwise we run into major problems later on.

Is that an invariant today?  num_entries <= AMDGPU_GPU_PAGES_IN_CPU_PAGE
skips the scan and is used as it is, so on a 64K page kernel a 4K mapping
maps a single GPU page and pages_addr is not consumed in whole CPU pages
there either.

So what should the code do for a mapping whose size is not a multiple of
AMDGPU_GPU_PAGES_IN_CPU_PAGE?  Could you sketch what you have in mind?

Thanks,
Junrui Luo