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API定义标准格式
/**
* list_entry - get the struct for this entry
* @ptr: the &struct list_head pointer.
* @type: the type of the struct this is embedded in.
* @member: the name of the list_struct within the struct.
*/
#define list_entry(ptr, type, member) \
container_of(ptr, type, member)功能：将指针ptr指向结构体type中的成员member，并通过指针ptr返回结构体type的起始地址。
FROM “list.h”