1. 根目录:
2. arch
3. m68k
4. include
5. asm
6. uaccess.h

#ifdef __uClinux__
#include <asm/uaccess_no.h>
#else
#include <asm/uaccess_mm.h>
#endif

#ifdef CONFIG_CPU_HAS_NO_UNALIGNED
#include <asm-generic/uaccess-unaligned.h>
#else
#define __get_user_unaligned(x, ptr)	__get_user((x), (ptr))
#define __put_user_unaligned(x, ptr)	__put_user((x), (ptr))
#endif