diff --git a/include/linux/libata.h b/include/linux/libata.h
index 890262f..cbbc821 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -122,6 +122,7 @@
 	/* struct ata_device stuff */
 	ATA_DFLAG_LBA		= (1 << 0), /* device supports LBA */
 	ATA_DFLAG_LBA48		= (1 << 1), /* device supports LBA48 */
+	ATA_DFLAG_CFG_MASK	= (1 << 8) - 1,
 
 	ATA_DFLAG_PIO		= (1 << 8), /* device currently in PIO mode */