Fwd: Problem: plist_add undefined!

[Julie Sullivan]

Hi All,
If you reply to this please make sure to Cc Monica Puig-Pey
<puigpeym at unican.es> as well as kernelnewbies each time , I doubt
she's subscribed.
Cheers
Julie


---------- Forwarded message ----------
From: Monica Puig-Pey <puigpeym at unican.es>
Date: Tue, Dec 20, 2011 at 9:24 AM
Subject: Problem: plist_add undefined!
To: linux-rt-users at vger.kernel.org, linux-kernel at vger.kernel.org



Hi there,

As I told in previous posts in this list I'm developing drivers for the

linux-rt kernel version in Ubuntu 10.04, based on 2.6.31 with rt_preempt patch.

Currently I'm studying how to use priority lists (linux/plist.h) in a
module. I read some pages from the Linux Kernel Development book to
learn how linked list work in the kernel.

I made and easy example, shown below, trying to put three elements,
with their priorities, in a plist_head.

Then, I had two problems:

* First error:

 An error is produced when using the MACROs:
   - PLIST_HEAD_INIT(head, _lock)
   - PLIST_NODE_INIT(node, __prio)

 it says :


/home/monica/Escritorio/plists/priolist.c: In function 'init_module':
/home/monica/Escritorio/plists/priolist.c:67: error: expected
expression before '.' token


 --> To solve this I used the functions:


- static inline void plist_head_init(struct plist_head *head, struct
spinlock *lock)

- static inline void plist_node_init(struct plist_node *node, int prio)

 But I still have the problem with the MACRO




* Second error, problem using plist_add:

 It says:


“WARNING: "plist_add" [/home/monica/Escritorio/plists/priolist.ko] undefined! ”

 I made the module GPL, I don't know what am I doing wrong.

Does anybody have an idea what is happening?

Thanks in advance for any help,

Cheers,

       Monica

CODE:

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/plist.h>
#include <linux/spinlock.h>


MODULE_LICENSE("GPL");

#define pid_miguel 1
#define fichero_miguel 1
#define prio_miguel 10


#define pid_monica 2
#define fichero_monica 1
#define prio_monica 30

#define pid_hector 3
#define fichero_hector 1
#define prio_hector 20



static DEFINE_SPINLOCK(lock);


struct misdatos
{
 int pid;
 int fichero;
 struct plist_node token_del_plist;
};


int init_module(void)
{


 struct plist_head mi_lista_de_datos;
 //struct spinlock lock;
 struct misdatos datos_miguel;
 struct misdatos datos_monica;
 struct misdatos datos_hector;

 struct misdatos *elemento_iterador;

 // Inicializo mi lista
 //PLIST_HEAD_INIT( mi_lista_de_datos, lock);
 plist_head_init( &mi_lista_de_datos, &lock);

 // Creo mis datos
 datos_miguel.pid = pid_miguel;
 datos_miguel.fichero = fichero_miguel;

 datos_monica.pid = pid_monica;
 datos_monica.fichero = fichero_monica;

 datos_hector.pid = pid_hector;
 datos_hector.fichero = fichero_hector;

 // Inicializamos los nodos CON LA PRIORIDAD
 //PLIST_NODE_INIT(datos_miguel.token_del_plist, prio_miguel);
 //PLIST_NODE_INIT(datos_monica.token_del_plist, prio_monica);
 //PLIST_NODE_INIT(datos_hector.token_del_plist, prio_hector);
 plist_node_init(&datos_miguel.token_del_plist, prio_miguel);
 plist_node_init(&datos_monica.token_del_plist, prio_monica);
 plist_node_init(&datos_hector.token_del_plist, prio_hector);


 // Los agnadimos
 plist_add(&(datos_miguel.token_del_plist), &mi_lista_de_datos);
 plist_add(&(datos_monica.token_del_plist), &mi_lista_de_datos);
 plist_add(&(datos_hector.token_del_plist), &mi_lista_de_datos);




plist_for_each_entry(elemento_iterador, &mi_lista_de_datos, token_del_plist)

 {

printk(KERN_INFO "El pid es : %d, con prioridad %d\n",
elemento_iterador->pid, elemento_iterador->token_del_plist.prio);

 }
 return 0;
}

void cleanup_module(void)
{
printk(KERN_INFO "cleanup_module() called\n");

}
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