Good morning. I face the following problem...
I am trying to compile this simple module
#ifndef MODULE /*Makes code portable for the 2.4
series */
# define MODULE
#endif
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
static int __init initmodule(void)
{
printk("<1> Hello, world 4\n");
return 0;
}
static void __exit cleanupmodule(void)
{
printk("<1> Goodbye, world 4\n");
}
module_init(initmodule);
module_exit(cleanupmodule);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mickey Mouse");
MODULE_DESCRIPTION("Description goes here");
I compile it with the command
gcc -c -O2 -W -Wall -Wstrict-prototypes
-Wmissing-prototypes -isystem
/lib/modules/2.4.25/build/include -DMODULE -D__KERNEL
first.c
The problem is that a warning is displayed
first.c: In function `initmodule':
first.c:11: warning: implicit declaration of function
`printk'
I have searched aroung google but nothing like my
mistake.... I want to know what else to do except
killing myself.
Also.. why the warning appear only for the init
function and not for the exit?
~
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