linux-kernel - Re: [PATCH V2 2/4] misc: vop: do not allocate and reassign the used ring

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Message-ID: <20200929102419.GB7784@infradead.org>
Date:   Tue, 29 Sep 2020 11:24:19 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Sherry Sun <sherry.sun@....com>
Cc:     hch@...radead.org, sudeep.dutt@...el.com, ashutosh.dixit@...el.com,
        arnd@...db.de, gregkh@...uxfoundation.org, kishon@...com,
        lorenzo.pieralisi@....com, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-imx@....com
Subject: Re: [PATCH V2 2/4] misc: vop: do not allocate and reassign the used
 ring

> 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.