Linux kprintf with some debug info

debug_k_printf.c

#define _dprintk(_fmt, ... )\
   do {                                                        \
       struct timeval _t0;                                     \
       do_gettimeofday(&_t0);                                  \
       printk(KERN_ERR "%03d.%06d %s():%d - " _fmt "%s\n",     \
               (int)(_t0.tv_sec % 1000), (int)_t0.tv_usec,     \
               __func__, __LINE__, __VA_ARGS__);               \
   } while (0);
#define sprintk(...) _dprintk(__VA_ARGS__, "")
#ifdef PDEBUG
#define dprintk(...) _dprintk(__VA_ARGS__, "")
#else
#define dprintk(...) do {} while(0);
#endif