Re: [Xenomai] Error: could not insert module kernel-task.ko: Unknown symbol in module

[Helder Daniel <hdaniel@ualg.pt>]

Hi,

Are you using Xenomai version 3.x or 2.6.x?

In version 3.x the native API is no longer exported to kernel, only the
RTDM API.

//NOT EXPORTED in 3.x: #include <native/task.h>

Helder



On 18 April 2015 at 03:52, Ruika You <crazylinuxcnc@gmail.com> wrote:

> Dear all,
>
> I just start to explore xenomai with compile a kernel module as simple as
> "hello world". After compile successful, sudo insmod kernel-task.ko,
> failed, error message as follow:
> Error: could not insert module kernel-task.ko: Unknown symbol in module
>
> Dmesg result as belllow:
> [52170.262642] kernel_task: Unknown symbol rt_task_create (err 0)
> [52170.262688] kernel_task: Unknown symbol rt_task_start (err 0)
> [52170.262722] kernel_task: Unknown symbol rt_task_delete (err 0)
>
> Source code:
> #include <native/task.h>
> #define TASK_PRIO 99 /* Highest RT priority */
> #define TASK_MODE T_FPU|T_CPU(0) /* Uses FPU, bound to CPU #0 */
> #define TASK_STKSZ 4096 /* Stack size (in bytes) */
> RT_TASK task_desc;
> void task_body (void *cookie)
> {
> for (;;) {
> /* ... "cookie" should be NULL ... */
> }
> }
> int init_module (void)
> {
> int err;
> /* ... */
> err =
> rt_task_create(&task_desc,"MyTaskName",TASK_STKSZ,TASK_PRIO,TASK_MODE);
> if (!err)
> rt_task_start(&task_desc,&task_body,NULL);
> return 1;
> /* ... */
> }
> void cleanup_module (void)
> {
> rt_task_delete(&task_desc);
> }
>
> As I analyzed the reason might be :
>
> 1. kernel build configure problem ?
> 2. xenomai userland  configure problem?
> 3. any xenomai module not loaded? native?
> 4. have to export all these unknow symbol to kernel?
>
> Please advise!
> Thank you very much!
> -chengxi
> _______________________________________________
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> Xenomai@xenomai.org
> http://www.xenomai.org/mailman/listinfo/xenomai
>



-- 
Helder Daniel
UALG - FCT
DEEI

http://w3.ualg.pt/~hdaniel