stddef.h

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#define NULL    (void*)0
#define restrict /* restrict */

#ifdef __compiler_offsetof
#define offsetof(TYPE,MEMBER) __compiler_offsetof(TYPE,MEMBER)
#else
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif

#define __PACKED __attribute__((packed))

#define __UNUSED __attribute__((unused))

#define __NORET __attribute__((noreturn))

#define container_of(ptr, type, member) \
        ({ const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
        (type *)( (char *)__mptr - offsetof(type,member) );})

#define prefetch(a)     (void)(a)