#define container_of(ptr, type, member) ({			
	const typeof( ((type *)0)->member ) *__mptr = (ptr);	
	(type *)( (char *)__mptr - offsetof(type,member) );})
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struct person{
    int age;
    char *name;
}somebody;
struct person *the_person
the_person = container_of (somebody.name, struct person, name);
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