WARNING: "rt_task_init" [*.ko] undefined!

Hi, everyone

I am building the simple rtai kernel module showed in RTAI 3.4 User Manual rev 0.3, and I got a warning which said that the rt_task_init was not defined during the make process and an error about 


	
	
	
	Invalid Parameters  when I tried to insert the *.ko file. The nm commands seems to verify this. 

The outputs of the make/insmod/nm commands are:
***********************************************************************



	
	
	
	


root@Justice:/home/athrun/桌面/mRTAIcodes/KernelMode#
make

make
-C /lib/modules/3.4-9-rtai-686-pae/build
M=/home/athrun/桌面/mRTAIcodes/KernelMode
modules -I/usr/realtime-3.4-9-rtai-686-pae/include

make[1]:
Entering directory `/usr/src/linux-headers-3.4-9-rtai-686-pae'

  CC
[M]  /home/athrun/桌面/mRTAIcodes/KernelMode/rtai_kernel_mode_task2.o

  Building
modules, stage 2.

  MODPOST
1 modules

WARNING:
"rt_task_init"
[/home/athrun/桌面/mRTAIcodes/KernelMode/rtai_kernel_mode_task2.ko]
undefined!

  CC
    
/home/athrun/桌面/mRTAIcodes/KernelMode/rtai_kernel_mode_task2.mod.o

  LD
[M]  /home/athrun/桌面/mRTAIcodes/KernelMode/rtai_kernel_mode_task2.ko

make[1]:
Leaving directory `/usr/src/linux-headers-3.4-9-rtai-686-pae'

root@Justice:/home/athrun/桌面/mRTAIcodes/KernelMode#
insmod rtai_kernel_mode_task2.ko

Error:
could not insert module rtai_kernel_mode_task2.ko: Invalid
parameters 
root@Justice:/home/athrun/桌面/mRTAIcodes/KernelMode#
nm 
rtai_kernel_mode_task2.ko00000000 b Simple_Task

00000000
t Simple_Thread

00000000
r ____versions

00000000
r __mod_license10

00000015
r __mod_vermagic5

0000000c
r __module_depends

00000000
D __this_module

00000090
T cleanup_module

00000030
T init_module

     
   U
printk

     
   U
rt_task_init


****************************************************************
and the source file  rtai_kernel_mode_task2.c :
 #include <linux/module.h>

//#include <linux/kernel.h>

//#include <linux/init.h>

#include <asm/io.h>

#include <rtai.h>

#include <rtai_sched.h>

 

static RT_TASK Simple_Task; 

 
MODULE_LICENSE("GPL");

 
static void Simple_Thread(long int t)

{

    //This is the real-time thread

    int i=0;

    for(i=0;i<100;i++)

    {

        printk("Simple_Thread i = %d",i);

    }

}

 
int init_module(void)

{

    int rt_task_init_result=1;

    printk("Init module function starting point\n");

    rt_task_init_result=rt_task_init(&Simple_Task,Simple_Thread,0,3000,0,0,0);

 
    if(0==rt_task_init_result)

    {

        printk("RTAI task init success!\n");

    }

    return 0;

}

void cleanup_module(void)

{

    printk("Cleanup module function starting point\n");

} 
***********************************************
The makefile:
obj-m += rtai_kernel_mode_task2.o

all:
    make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules -I/usr/realtime-3.4-9-rtai-686-pae/include

clean:
    make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean***************************************************Have you ever met this problem before? Or would you help me to fix it?3Q~                                                                  yours: C.P.                                                                 2016-09-29

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