len += get_blkdev_list(page+len);
len += get_blkdev_list(page+len, len);
static int devices_read_proc(char *page, char **start, off_t off,				 int count, int *eof, void *data){	int len = get_chrdev_list(page);	len += get_blkdev_list(page+len);	return proc_calc_metrics(page, start, off, count, eof, len);}