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我在调用athread_get/put接口在主存和局存之间传递数据时，报出warning: passing argument 5 of 'athread_get' discards qualifiers from pointer target type这样的警告，然后函数的返回值并非0，（手册中说返回值非0都是有问题），结果我分析，返回值是我传递的数据量的大小，请问这是什么原因造成的呢？