1. 根目录:
2. tools
3. perf
4. util
5. include
6. asm
7. uaccess.h

#ifndef _PERF_ASM_UACCESS_H_
#define _PERF_ASM_UACCESS_H_

#define __get_user(src, dest)						\
({									\
	(src) = *dest;							\
	0;								\
})

#define get_user	__get_user

#define access_ok(type, addr, size)	1

#endif