URL: https://linuxfr.org/forums/linux-noyau/posts/warning-a-la-compilation-d-un-module-temps-reel-rtai
Title: Warning à la compilation d'un module Temps Réel (RTAI)
Authors: SpeedInfo
Date: 2014年04月11日T02:21:39+02:00
License: CC By-SA
Tags: 
Score: 1
Bonsoir,
A la compilation d'un module qui utilise les fonctions Temps Réel de RTAI. J'ai une suite de Warnings qui ressemblent à ça:
```sh
Warning: "stop_rt_timer" [/....................time.ko] undefined!
Warning: "rt_task_delete" [/....................time.ko] undefined!
Warning: "rt_task_make_periodic" [/....................time.ko] undefined!*** Warning: 
Warning: "rt_get_time" [/....................time.ko] undefined!
Warning: "start_rt_timer" [/....................time.ko] undefined!
Warning: "rt_set_periodic_mode" [/....................time.ko] undefined!
Warning: "rt_task_init" [/....................time.ko] undefined!
Warning: "nano2count" [/....................time.ko] undefined!
Warning: "rt_get_time" [/....................time.ko] undefined!
Warning: "rt_task_init" [/....................time.ko] undefined!
```
Pourtant, j'ai fait include la bibliothèque "rtai_sched.h" et dans le Makefile j'ai spécifié le chemin de la bibliothèque.
Ci-dessous le code et le Makefile
```C
#include <linux/kernel.h> 
#include <linux/module.h> 
#include <linux/version.h> 
#include <linux/sched.h> 
#include <linux/errno.h> 
#include <asm/io.h>
#include <rtai.h>
#include <rtai_sched.h>
#include <rtai_shm.h>
static RT_TASK sound_task;
static RTIME sound_period_ns = 1000000;
#define SOUND_PORT 0x061
#define SOUND_MASK 0x02
void sound_fct(){
 unsigned char sound_byte;
 unsigned char toggle = 0;
 while (1){
 sound_byte = inb(SOUND_PORT);
 if (toggle){
 sound_byte = sound_byte &#124; SOUND_MASK;
 }
 else {
 sound_byte = sound_byte & ~SOUND_MASK;
 }
 outb (sound_byte,SOUND_PORT);
 toggle = !toggle;
 rt_task_wait_period();
 }
 return;
 }
int init_module(void) {
RTIME sound_period_count;
RTIME timer_period_count;
int retval;
printk("inserting sound module\n");
rt_set_periodic_mode();
sound_period_count = nano2count(sound_period_ns); //conversion de la pأ©riode (ns) en tics d'horloge
timer_period_count = start_rt_timer(sound_period_count); //requete d'une pأ©riode formulأ©e en tics d'horloge
printk("peiodic_task: rquested %d counts, got %d counts \n", (int) sound_period_count, (int) timer_period_count); //periode obtenue auprأ ̈s du timer
/* ================ test ici de requete de la periode ===================================*/
retval = rt_task_init(&sound_task, sound_fct, 0, 1024, RT_SCHED_LOWEST_PRIORITY, 0,0);
if (retval !=0) {
 if (-EINVAL == retval) printk("task already in use\n");
 else if (-ENOMEM == retval) printk("could not allocate stack\n");
 else printk("error initializing task\n");
 return 0;
}
rt_task_make_periodic(&sound_task, rt_get_time()+ sound_period_count, sound_period_count);
}
void cleanup_module(void){
rt_task_delete(&sound_task);
outb (inb(SOUND_PORT) & ~SOUND_MASK, SOUND_PORT); //On أ©teint le son
stop_rt_timer();
}
```
```sh 
===============================================================================
Makefile
===============================================================================
obj-m := time.o
KDIR:= /lib/modules/3.8.13/build
EXTRA_CFLAGS := -I/usr/realtime/include -I/usr/include
PWD := /root/exercices/ex02
default:
		make -C $(KDIR) SUBDIRS=$(PWD) modules
clean:
		make -C $(KDIR) SUBDIRS=$(PWD) clean
```
J'espère que vous pourriez m'aider. Merci d'avance.
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