ide: add warning about possible HPA compatibility issue

Index: b/drivers/ide/ide-disk.c
===================================================================
@@ -302,6 +302,16 @@ static const struct drive_list_entry hpa
 	{ NULL,		NULL }
 };
 
+static inline void ide_disk_hpa_warn(unsigned long long first_sector,
+				     unsigned long long last_sector)
+{
+	printk(KERN_WARNING "\t*** possible compatibility issue:\n"
+		"\t*** sectors %llu-%llu may be inaccessible\n"
+		"\t*** if Host Protected Area is used for filesystem data\n"
+		"\t*** (please refer to \"ignore_hpa\" module parameter)\n",
+		first_sector, last_sector);
+}
+
 static void idedisk_check_hpa(ide_drive_t *drive)
 {
 	unsigned long long capacity, set_max;

@@ -330,8 +340,10 @@ static void idedisk_check_hpa(ide_drive_
 			 capacity, sectors_to_MB(capacity),
 			 set_max, sectors_to_MB(set_max));
 
-	if (ide_ignore_hpa == 0)
+	if (ide_ignore_hpa == 0) {
+		ide_disk_hpa_warn(capacity, set_max - 1);
 		return;
+	}
 
 	set_max = idedisk_set_max_address(drive, set_max, lba48);