# Re: \[PATCH net-next v2 5/7\] virtio-net, xsk: realize the function of xsk packet sending

- From: Jakub Kicinski \<kuba@kernel.org\>
- Date: 2021-01-16 04:48:27 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/01/7756753
- Thread: https://ratatoskr.run/netdev/2021/01/6223975/t.md

```text
On Sat, 16 Jan 2021 10:59:26 +0800 Xuan Zhuo wrote:
> +	idx = sq->xsk.hdr_con % sq->xsk.hdr_n;

The arguments here are 64 bit, this code will not build on 32 bit
machines:

ERROR: modpost: "__umoddi3" [drivers/net/virtio_net.ko] undefined!

There's also a sparse warning in this patch:

drivers/net/virtio_net.c:2704:16: warning: incorrect type in assignment (different address spaces)
drivers/net/virtio_net.c:2704:16:    expected struct virtnet_xsk_hdr *xskhdr
drivers/net/virtio_net.c:2704:16:    got struct virtnet_xsk_hdr [noderef] __rcu *
```