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

#ifndef ___ASM_SPARC_UACCESS_H
#define ___ASM_SPARC_UACCESS_H
#if defined(__sparc__) && defined(__arch64__)
#include <asm/uaccess_64.h>
#else
#include <asm/uaccess_32.h>
#endif

#define user_addr_max() \
	(segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL)

long strncpy_from_user(char *dest, const char __user *src, long count);

#endif