解析内核中的offset代码，通过结构体成员地址反获取结构体地址从而可以操控整个结构体，深化对指针的理解，有些面试题中也可能会遇到这种情况-翻译

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Parsing the offset code in the kernel, through the structural member address anti-obtain structural address which can manipulate the entire structure, deepen the understanding of the pointer, some face may also encounter this situation