I can't printk() with netfilter

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In the definition of the hook function, the function
printk() is called, but nothing matter.... or i can't
see  where it happens (the "Dropped packet on ...." is
showed in the screen..!!!).  Please, can anybody tell
me what must i do or what is wrong with this? Thanks!

    unsigned int hook_func(unsigned int hooknum,
                           struct sk_buff **skb,
                           const struct net_device
*in,
                           const struct net_device
*out,
                           int (*okfn)(struct sk_buff
*))
    {
        if (strcmp(in->name, drop_if) == 0) {
            printk("Dropped packet on %s...\n",
drop_if);
            return NF_DROP;
	} else {
	    return NF_ACCEPT;
	}
    }


		
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