ttm_tt_create
.ttm_tt_create = &amdgpu_ttm_tt_create,
struct ttm_tt *(*ttm_tt_create)(struct ttm_buffer_object *bo,
int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc);
.ttm_tt_create = &radeon_ttm_tt_create,
ret = ttm_tt_create(bo, true);
ret = ttm_tt_create(bo, zero);
return ttm_tt_create(bo, false);
bo->ttm = bdev->driver->ttm_tt_create(bo, page_flags);