[RFC PATCH 07/78] hw/virtio/virtio-balloon.c: add fallthrough pseudo-keyword

[Emmanouil Pitsidianakis]

In preparation of raising -Wimplicit-fallthrough to 5, replace all
fall-through comments with the fallthrough attribute pseudo-keyword.

Signed-off-by: Emmanouil Pitsidianakis <manos.pitsidianakis@linaro.org>
---
 hw/virtio/virtio-balloon.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
index d004cf29d2..0f0d94bd94 100644
--- a/hw/virtio/virtio-balloon.c
+++ b/hw/virtio/virtio-balloon.c
@@ -636,56 +636,57 @@ static int
 virtio_balloon_free_page_hint_notify(NotifierWithReturn *n, void *data)
 {
     VirtIOBalloon *dev = container_of(n, VirtIOBalloon, free_page_hint_notify);
     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
     PrecopyNotifyData *pnd = data;
 
     if (!virtio_balloon_free_page_support(dev)) {
         /*
          * This is an optimization provided to migration, so just return 0 to
          * have the normal migration process not affected when this feature is
          * not supported.
          */
         return 0;
     }
 
     /*
      * Pages hinted via qemu_guest_free_page_hint() are cleared from the dirty
      * bitmap and will not get migrated, especially also not when the postcopy
      * destination starts using them and requests migration from the source; 
the
      * faulting thread will stall until postcopy migration finishes and
      * all threads are woken up. Let's not start free page hinting if postcopy
      * is possible.
      */
     if (migrate_postcopy_ram()) {
         return 0;
     }
 
     switch (pnd->reason) {
     case PRECOPY_NOTIFY_BEFORE_BITMAP_SYNC:
         virtio_balloon_free_page_stop(dev);
         break;
     case PRECOPY_NOTIFY_AFTER_BITMAP_SYNC:
         if (vdev->vm_running) {
             virtio_balloon_free_page_start(dev);
             break;
         }
         /*
          * Set S_DONE before migrating the vmstate, so the guest will reuse
          * all hinted pages once running on the destination. Fall through.
          */
+        fallthrough;
     case PRECOPY_NOTIFY_CLEANUP:
         /*
          * Especially, if something goes wrong during precopy or if migration
          * is canceled, we have to properly communicate S_DONE to the VM.
          */
         virtio_balloon_free_page_done(dev);
         break;
     case PRECOPY_NOTIFY_SETUP:
     case PRECOPY_NOTIFY_COMPLETE:
         break;
     default:
         virtio_error(vdev, "%s: %d reason unknown", __func__, pnd->reason);
     }
 
     return 0;
 }
-- 
2.39.2