Extern or forward variable declaration at include/linux/libata.h, line 1241 References: drivers/ata/libata-core.c, line 6495 drivers/ata/pata_imx.c, line 94 drivers/ata/pata_imx.c, line 180 drivers/ata/sata_highbank.c, line 465 drivers/ata/sata_mv.c, line 4051 drivers/ata/sata_mv.c, line 4203 drivers/ata/sata_mv.c, line 4226 drivers/ata/sata_mv.c, line 4235 drivers/ata/sata_rcar.c, line 857 drivers/ata/sata_rcar.c, line 921 include/linux/libata.h, line 1241 include/linux/libata.h, line 1243