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之所以需要自旋锁，是为了保证“原子操作”，请问，在AM57xx中，32位的系统，对于一个 Int32 数据的读、写，其本身是否就已经是“原子操作”? 若多核对同一 Int32 （仅一个）变量访问，是否不需要自旋锁？
