virtio: Reorder fields in 'struct virtqueue'

Group some variables based on their sizes to reduce hole and avoid padding.
On x86_64, this shrinks the size of 'struct virtqueue'
from 72 to 68 bytes.

It saves a few bytes of memory.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Message-Id: <8f3d2e49270a2158717e15008e7ed7228196ba02.1676707807.git.christophe.jaillet@wanadoo.fr>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Peter Lafreniere <peter@n8pjl.ca>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>

diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 2b47251..d6e161a 100644 (file)
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -34,8 +34,8 @@ struct virtqueue {
        unsigned int index;
        unsigned int num_free;
        unsigned int num_max;
-       void *priv;
        bool reset;
+       void *priv;
 };
 
 int virtqueue_add_outbuf(struct virtqueue *vq,