user mode linux on kernel 2.6

comp 
http://usermodelinux.org/modules.php?name=News&file=article&sid=142

 --- 1.5/arch/um/os-Linux/process.c Sat Jan 18 12:29:27 2003 
 +++ 1.6/arch/um/os-Linux/process.c Thu Oct 2 14:27:57 2003 
 @@ -7,6 +7,7 @@ 
 #include  
 #include  
 #include  
 + #include  
 #include  
 #include  
 #include "os.h" 
 @@ -87,7 +88,8 @@ 

 void os_usr1_process(int pid) 
 { 
 - kill(pid, SIGUSR1); 
 + syscall(__NR_tkill, pid, SIGUSR1); 
 +/* tkill(pid, SIGUSR1);*/ 
 } 

 int os_getpid(void)

これでハマッってるぽい。メモメモ。