RE: [PATCH RFC 1/2] virtio: introduce packed ring defines

[David Laight]

From: Tiwei Bie
> Sent: 23 February 2018 11:18
...
> +struct vring_packed_desc_event {
> +	/* Descriptor Event Offset */
> +	__virtio16 desc_event_off   : 15,
> +	/* Descriptor Event Wrap Counter */
> +		   desc_event_wrap  : 1;
> +	/* Descriptor Event Flags */
> +	__virtio16 desc_event_flags : 2;
> +};

This looks like you are assuming that a bit-field has a defined
layout and can be used to map a 'hardware' structure.
The don't, don't use them like that.

	David