about pr_debug

[Varka Bhadram]

refer this :https://www.kernel.org/doc/local/pr_debug.txt

On 06/25/2014 11:39 AM, lx wrote:
> 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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