amdgpu_ttm_clear_buffer
r = amdgpu_ttm_clear_buffer(amdgpu_ttm_next_clear_entity(adev),
r = amdgpu_ttm_clear_buffer(amdgpu_ttm_next_clear_entity(adev),
r = amdgpu_ttm_clear_buffer(entity, abo, NULL, &wipe_fence,
int amdgpu_ttm_clear_buffer(struct amdgpu_ttm_buffer_entity *entity,