about pr_debug

[lx]

hi all:
       I'm confused with pr_debug. My codes is:
###########################################
#include <linux/module.h>
#include <linux/kernel.h>

static int __init init_page_dir(void)
{
    pr_debug("Hello world\n");
    return 0;
}

static void __exit exit_page_dir(void)
{
    pr_debug("\nGoodbye now...\n\n");
}

MODULE_LICENSE("GPL");
module_init(init_page_dir);
module_exit(exit_page_dir);
###########################################
I make it, and insmod it. But the messages of "Hello world" don't show.

So, My question is If i want to fix it , I should set the
*DEFAULT_MESSAGE_LOGLEVEL
and *
*rebuild the kernel ?*

My kernel version is:2.6.18
OS is: centOS

Thank you.
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