Extern or forward variable declaration at drivers/staging/comedi/comedidev.h, line 601 References: drivers/staging/comedi/comedidev.h, line 601 drivers/staging/comedi/comedidev.h, line 608 drivers/staging/comedi/drivers/dt2801.c, line 404 drivers/staging/comedi/drivers/dt2801.c, line 424 drivers/staging/comedi/drivers/dt2815.c, line 170 drivers/staging/comedi/drivers/pcl726.c, line 69 drivers/staging/comedi/drivers/pcl726.c, line 78 drivers/staging/comedi/drivers/pcl726.c, line 85 drivers/staging/comedi/drivers/pcl812.c, line 1236 drivers/staging/comedi/drivers/pcl812.c, line 1250 drivers/staging/comedi/drivers/pcl812.c, line 1255 drivers/staging/comedi/drivers/pcl818.c, line 277 drivers/staging/comedi/drivers/pcl818.c, line 945 drivers/staging/comedi/drivers/pcl818.c, line 1068 drivers/staging/comedi/drivers/pcmad.c, line 130 drivers/staging/comedi/drivers/vmk80xx.c, line 122 drivers/staging/comedi/range.c, line 22 drivers/staging/comedi/range.c, line 23