include/linux/stddef.h

#ifndef _LINUX_STDDEF_H
#define _LINUX_STDDEF_H

#include <linux/compiler_types.h>

#undef NULL
#if defined(__cplusplus)
#define NULL 0
#else
#define NULL ((void *)0)
#endif

#ifndef _SIZE_T
#include <linux/types.h>
#endif

#undef offsetof
#define offsetof(TYPE, MEMBER)	__builtin_offsetof(TYPE, MEMBER)

#endif