virtio_pci_modern: correct sparse tags for notify

When switching virtio_pci_modern to use a helper for mappings we lost an
__iomem tag. Restore it.
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 9e3bb9b7 ("virtio_pci_modern: introduce helper to map vq notify area")
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

drivers/virtio/virtio_pci_modern_dev.c

@@ -605,8 +605,8 @@ static u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev,
  *
  * Returns the address of the notification area
  */
-void *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
-			      u16 index, resource_size_t *pa)
+void __iomem *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
+				      u16 index, resource_size_t *pa)
 {
 	u16 off = vp_modern_get_queue_notify_off(mdev, index);
 
@@ -624,10 +624,9 @@ void *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
 		if (pa)
 			*pa = mdev->notify_pa +
 			      off * mdev->notify_offset_multiplier;
-		return (void __force *)mdev->notify_base +
-			off * mdev->notify_offset_multiplier;
+		return mdev->notify_base + off * mdev->notify_offset_multiplier;
 	} else {
-		return (void __force *)vp_modern_map_capability(mdev,
+		return vp_modern_map_capability(mdev,
 				       mdev->notify_map_cap, 2, 2,
 				       off * mdev->notify_offset_multiplier, 2,
 				       NULL, pa);

include/linux/virtio_pci_modern.h

@@ -101,8 +101,8 @@ void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev,
 u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev,
 			     u16 idx);
 u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev);
-void *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
-                              u16 index, resource_size_t *pa);
+void __iomem * vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
+				       u16 index, resource_size_t *pa);
 int vp_modern_probe(struct virtio_pci_modern_device *mdev);
 void vp_modern_remove(struct virtio_pci_modern_device *mdev);
 #endif