[03/11] UAPI: virtio_net: Fix use of C++ keywords as structural members [ver #2]
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Message ID 153622552270.14298.14568295161017777604.stgit@warthog.procyon.org.uk
State New
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  • [01/11] UAPI: drm: Fix use of C++ keywords as structural members [ver #2]
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Commit Message

David Howells Sept. 6, 2018, 9:18 a.m. UTC
The virtio_net_ctrl_hdr struct uses a C++ keyword as structural members.  Fix
this by inserting an anonymous union that provides an alternative name and
then hide the reserved name in C++.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: "Michael S. Tsirkin" <mst@redhat.com>
cc: Jason Wang <jasowang@redhat.com>
cc: virtualization@lists.linux-foundation.org
---

 include/uapi/linux/virtio_net.h |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Comments

Michael S. Tsirkin Sept. 6, 2018, 3:02 p.m. UTC | #1
On Thu, Sep 06, 2018 at 10:18:42AM +0100, David Howells wrote:
> The virtio_net_ctrl_hdr struct uses a C++ keyword as structural members.  Fix
> this by inserting an anonymous union that provides an alternative name and
> then hide the reserved name in C++.
> 
> Signed-off-by: David Howells <dhowells@redhat.com>
> cc: "Michael S. Tsirkin" <mst@redhat.com>
> cc: Jason Wang <jasowang@redhat.com>
> cc: virtualization@lists.linux-foundation.org
> ---
> 
>  include/uapi/linux/virtio_net.h |    7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
> index a3715a3224c1..967142bc0e05 100644
> --- a/include/uapi/linux/virtio_net.h
> +++ b/include/uapi/linux/virtio_net.h
> @@ -150,7 +150,12 @@ struct virtio_net_hdr_mrg_rxbuf {
>   * command goes in between.
>   */
>  struct virtio_net_ctrl_hdr {
> -	__u8 class;
> +	union {
> +#ifndef __cplusplus
> +		__u8 class;
> +#endif
> +		__u8 _class;
> +	};
>  	__u8 cmd;
>  } __attribute__((packed));
>  

So if we are going to do this, I think I'd prefer something like:

struct virtio_net_ctrl_hdr_v2 {
	__u8 cmd_class;
  	__u8 cmd;
};

And then hide the whole old structure. This also gets rid of the packed
keyword which we don't really need here.

Only issue is virtio_net_ctrl_hdr_v2 is ugly. But oh well.

And then rework at least QEMU to use the v2 of the header.

Quite a bit of churn, so I don't think it makes sense to apply just this
one in isolation - only if rest of the changes go in.

Patch
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diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
index a3715a3224c1..967142bc0e05 100644
--- a/include/uapi/linux/virtio_net.h
+++ b/include/uapi/linux/virtio_net.h
@@ -150,7 +150,12 @@  struct virtio_net_hdr_mrg_rxbuf {
  * command goes in between.
  */
 struct virtio_net_ctrl_hdr {
-	__u8 class;
+	union {
+#ifndef __cplusplus
+		__u8 class;
+#endif
+		__u8 _class;
+	};
 	__u8 cmd;
 } __attribute__((packed));