AMDGPU_VA_RESERVED_SIZE
if (args->va_address < AMDGPU_VA_RESERVED_SIZE) {
args->va_address, AMDGPU_VA_RESERVED_SIZE);
vm_size -= AMDGPU_VA_RESERVED_SIZE;
dev_info.virtual_address_offset = AMDGPU_VA_RESERVED_SIZE;
addr -= AMDGPU_VA_RESERVED_SIZE;
uint32_t low = AMDGPU_VA_RESERVED_SIZE >> AMDGPU_GPU_PAGE_SHIFT;
(AMDGPU_VA_RESERVED_SIZE >> AMDGPU_GPU_PAGE_SHIFT);
uint32_t low = AMDGPU_VA_RESERVED_SIZE >> AMDGPU_GPU_PAGE_SHIFT;
(AMDGPU_VA_RESERVED_SIZE >> AMDGPU_GPU_PAGE_SHIFT);