linux-kernel - Re: linux-next: manual merge of the y2038 tree with the vhost tree

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Date:   Mon, 6 Jan 2020 09:31:14 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: linux-next: manual merge of the y2038 tree with the vhost tree

On Mon, Jan 6, 2020 at 5:24 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi all,
>
> Today's linux-next merge of the y2038 tree got a conflict in:
>
>   drivers/block/virtio_blk.c
>
> between commit:
>
>   d1281e3a562e ("virtio-blk: remove VIRTIO_BLK_F_SCSI support")
>
> from the vhost tree and commit:
>
>   d320a9551e39 ("compat_ioctl: scsi: move ioctl handling into drivers")
>
> from the y2038 tree.
>
> I wonder if this driver needs a compat_ioctl entry at all any more?

It doesn't. The rules used to be fairly complicated, but not
(after my patches) basically any driver that has an .ioctl
function must have a .compat_ioctl function and vice versa.

> index 54158766334b,fbbf18ac1d5d..000000000000
> --- a/drivers/block/virtio_blk.c
> +++ b/drivers/block/virtio_blk.c
> @@@ -310,6 -404,10 +310,9 @@@ static int virtblk_getgeo(struct block_
>   }
>
>   static const struct block_device_operations virtblk_fops = {
>  -      .ioctl  = virtblk_ioctl,
> + #ifdef CONFIG_COMPAT
> +       .compat_ioctl = blkdev_compat_ptr_ioctl,
> + #endif
>         .owner  = THIS_MODULE,
>         .getgeo = virtblk_getgeo,
>   };

Removing it would be better, but this version is not wrong.

        Arnd