NUM_EXTRA_DBG_LINES
return (struct dbg_bus_line*)&dbg_bus_lines[block_desc->lines_offset + block_bus->line_num - NUM_EXTRA_DBG_LINES(block_desc)];
#define NUM_DBG_LINES(block_desc) (block_desc->num_of_lines + NUM_EXTRA_DBG_LINES(block_desc))