Hi all,
I use the kernel version "3.10.0-4" that came with Ubuntu distribution.
When I compile the example module I got from LKMPG (hello-5.c) and try to load the driver by passing the module with the following command, it gives the following error:
# insmod parameter.ko mystring="bebop"
Error: could not insert module parameter.ko: Unknown symbol in module
Error in dmesg:
[ 3687.132110] parameter: Unknown parameter `mystring'
However, if I insert the module without any parameters, it gets inserted just fine.
# insmod parameter.ko
I am attaching the source code for reference. Kindly let me know what could be done.
Thanks,
Binoy
Regards,
Binoy Jayan
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#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/stat.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("LKMPG");
static short int myshort = 1;
static int myint = 420;
static long int mylong = 9999;
static char *mystring = "blah";
static int myintArray[2] = { -1, -1 };
static int arr_argc = 0;
/*
* module_param(foo, int, 0000)
* The first param is the parameters name
* The second param is it's data type
* The final argument is the permissions bits,
* for exposing parameters in sysfs (if non-zero) at a later stage.
*/
module_param(myshort, short, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
MODULE_PARM_DESC(myshort, "A short integer");
module_param(myint, int, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
MODULE_PARM_DESC(myint, "An integer");
module_param(mylong, long, S_IRUSR);
MODULE_PARM_DESC(mylong, "A long integer");
module_param(mystring, charp, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
MODULE_PARM_DESC(mystring, "A character string");
EXPORT_SYMBOL(mystring);
EXPORT_SYMBOL_GPL(myint);
/*
* module_param_array(name, type, num, perm);
* The first param is the parameter's (in this case the array's) name
* The second param is the data type of the elements of the array
* The third argument is a pointer to the variable that will store the number
* of elements of the array initialized by the user at module loading time
* The fourth argument is the permission bits
*/
module_param_array(myintArray, int, &arr_argc, 0000);
MODULE_PARM_DESC(myintArray, "An array of integers");
static int __init hello_5_init(void)
{
int i;
printk(KERN_INFO "Demonstrating module parameters\n");
printk(KERN_INFO "===============================\n");
printk(KERN_INFO "myshort is a short integer: %hd\n", myshort);
printk(KERN_INFO "myint is an integer: %d\n", myint);
printk(KERN_INFO "mylong is a long integer: %ld\n", mylong);
printk(KERN_INFO "mystring is a string: %s\n", mystring);
for (i = 0; i < (sizeof myintArray / sizeof (int)); i++)
{
printk(KERN_INFO "myintArray[%d] = %d\n", i, myintArray[i]);
}
printk(KERN_INFO "got %d arguments for myintArray.\n", arr_argc);
return 0;
}
static void __exit hello_5_exit(void)
{
printk(KERN_INFO "Goodbye...\n");
printk(KERN_INFO "===============================\n");
}
module_init(hello_5_init);
module_exit(hello_5_exit);
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