AMDGPU_GPU_PAGE_MASK
#define AMDGPU_GPU_PAGE_ALIGN(a) (((a) + AMDGPU_GPU_PAGE_MASK) & ~AMDGPU_GPU_PAGE_MASK)
if (saddr & AMDGPU_GPU_PAGE_MASK
|| offset & AMDGPU_GPU_PAGE_MASK
|| size & AMDGPU_GPU_PAGE_MASK)