linux-kernel - Re: ldd module param practice

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Date:	Sun, 22 Aug 2010 19:12:07 -0700 (PDT)
From:	rdunlap@...otime.net
To:	"runcoderen" <runcoderzhcn@...il.com>
Cc:	"Linux Kernel List" <linux-kernel@...r.kernel.org>
Subject: Re: ldd module param practice

On Sun, August 22, 2010 4:00 pm, runcoderen wrote:
> hi all:
>
> #include <linux/init.h>
> #include <linux/module.h>
> #include <linux/moduleparam.h>
>
>
> MODULE_LICENSE("Dual BSD/GPL");
>
>
> static char *whom = "world"; static char howmany = 1;


What happens if you make 'howmany' an int instead of
a char?


> module_param(howmany, int, S_IRUGO); module_param(whom, charp, S_IRUGO);
>
> static int hello_init(void) {
> printk(KERN_ALERT "Hello, world\n"); return 0; }
>
>
> static void hello_exit(void) {
> printk(KERN_ALERT "Goodbye, cruel world\n"); }
>
>
> module_init(hello_init); module_exit(hello_exit);
>
> insmod hellop.ko howmany=10 whom="Mom"
>
> this code I want to printk "hello Mom" 10 times.
>
> but it doesn't work. so I modified static int howmany = 10, it doesn't
> work either. I don't know whether it's my wronging use?


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