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[bluetooth-dev] debug info

I've got another question. 
Could anybody explain how the debug info works? 

I don't understand what I got to do with this: 
#define D_ERR(fmt, args...) printk(BT_SYS_STR" ERROR :" fmt, ## args)

The compiler doesn't understand it and I don't also

How can I use D_ERR, D_SYS, PRINTPKT etc.. 

Thnx again,