hi how does this work ??? #undef dbg #define dbg(format, arg,...) do {if(debug) printk(KERN_DEBUG __FILE__": "format "\n", ##arg); )while (0) #endif - Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/