ttm_bo_wait
ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
ret = ttm_bo_wait(bo, false, true, no_wait);
ret = ttm_bo_wait(bo, false, false, false);
(void) ttm_bo_wait(bo, false, false, true);
ret = ttm_bo_wait(bo, false, false, true);
ret = ttm_bo_wait(bo, false, false, true);
ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
extern int ttm_bo_wait(struct ttm_buffer_object *bo, bool lazy,
ret = ttm_bo_wait(bo, false, false, false);
ret = ttm_bo_wait(bo, false, false, false);