RE: [PATCH V2 2/4] misc: vop: do not allocate and reassign the used ring

[Sherry Sun]

Hi Christoph,

> > diff --git a/include/uapi/linux/mic_common.h
> > b/include/uapi/linux/mic_common.h index 504e523f702c..e680fe27af69
> > 100644
> > --- a/include/uapi/linux/mic_common.h
> > +++ b/include/uapi/linux/mic_common.h
> > @@ -56,8 +56,6 @@ struct mic_device_desc {
> >   * @vdev_reset: Set to 1 by guest to indicate virtio device has been reset.
> >   * @guest_ack: Set to 1 by guest to ack a command.
> >   * @host_ack: Set to 1 by host to ack a command.
> > - * @used_address_updated: Set to 1 by guest when the used address
> > should be
> > - * updated.
> >   * @c2h_vdev_db: The doorbell number to be used by guest. Set by host.
> >   * @h2c_vdev_db: The doorbell number to be used by host. Set by guest.
> >   */
> > @@ -67,7 +65,6 @@ struct mic_device_ctrl {
> >  	__u8 vdev_reset;
> >  	__u8 guest_ack;
> >  	__u8 host_ack;
> > -	__u8 used_address_updated;
> >  	__s8 c2h_vdev_db;
> >  	__s8 h2c_vdev_db;
> >  } __attribute__ ((aligned(8)));
> 
> This is an ABI change.

Yes, it is. But I noticed that this structure is only used by the vop driver.
And until now I haven't seen any user tools use it, including the user tool
mpssd which is corresponding to the vop driver.

Regards
Sherry