1. 根目录:
2. include
3. uapi
4. asm-generic
5. types.h

#ifndef _ASM_GENERIC_TYPES_H
#define _ASM_GENERIC_TYPES_H
/*
 * int-ll64 is used everywhere now.
 */
#include <asm-generic/int-ll64.h>

#endif /* _ASM_GENERIC_TYPES_H */