Hi All,
If you reply to this please make sure to Cc Monica Puig-Pey
<puigpeym@xxxxxxxxx> as well as kernelnewbies each time , I doubt
she's subscribed.
Cheers
Julie
---------- Forwarded message ----------
From: Monica Puig-Pey <puigpeym@xxxxxxxxx>
Date: Tue, Dec 20, 2011 at 9:24 AM
Subject: Problem: plist_add undefined!
To: linux-rt-users@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
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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