The QOM type of HvBalloon is declared by OBJECT_DECLARE_SIMPLE_TYPE,
which means it doesn't need the class!

Therefore, use OBJECT_DEFINE_SIMPLE_TYPE_WITH_INTERFACES to implement
the type, then there's no need for class definition.

Cc: "Maciej S. Szmigiero" <maciej.szmigiero@oracle.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
 hw/hyperv/hv-balloon.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/hw/hyperv/hv-balloon.c b/hw/hyperv/hv-balloon.c
index 94b0abbd6834..db3be4246eae 100644
--- a/hw/hyperv/hv-balloon.c
+++ b/hw/hyperv/hv-balloon.c
@@ -67,10 +67,6 @@
  * these requests
  */
 
-struct HvBalloonClass {
-    VMBusDeviceClass parent_class;
-} HvBalloonClass;
-
 typedef enum State {
     /* not a real state */
     S_NO_CHANGE = 0,
@@ -162,8 +158,8 @@ typedef struct HvBalloon {
     MemoryRegion *mr;
 } HvBalloon;
 
-OBJECT_DEFINE_TYPE_WITH_INTERFACES(HvBalloon, hv_balloon, HV_BALLOON, VMBUS_DEVICE, \
-                                   { TYPE_MEMORY_DEVICE }, { })
+OBJECT_DEFINE_SIMPLE_TYPE_WITH_INTERFACES(HvBalloon, hv_balloon, HV_BALLOON, VMBUS_DEVICE, \
+                                          { TYPE_MEMORY_DEVICE }, { })
 
 #define HV_BALLOON_SET_STATE(hvb, news)             \
     do {                                            \
-- 
2.34.1

On 14.05.2025 10:49, Zhao Liu wrote:
> The QOM type of HvBalloon is declared by OBJECT_DECLARE_SIMPLE_TYPE,
> which means it doesn't need the class!
> 
> Therefore, use OBJECT_DEFINE_SIMPLE_TYPE_WITH_INTERFACES to implement
> the type, then there's no need for class definition.
> 
> Cc: "Maciej S. Szmigiero" <maciej.szmigiero@oracle.com>
> Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
> ---

Acked-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>

Thanks,
Maciej