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SubjectRe: [PATCHv9 3/3] vhost_net: a kernel-level virtio server
On Tue, Nov 10, 2009 at 01:49:09PM +1030, Rusty Russell wrote:
> One fix:
>
> vhost: fix TUN=m VHOST_NET=y
>
> drivers/built-in.o: In function `get_tun_socket':
> net.c:(.text+0x15436e): undefined reference to `tun_get_socket'
>
> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
> ---
> drivers/vhost/Kconfig | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig
> --- a/drivers/vhost/Kconfig
> +++ b/drivers/vhost/Kconfig
> @@ -1,6 +1,6 @@
> config VHOST_NET
> tristate "Host kernel accelerator for virtio net (EXPERIMENTAL)"
> - depends on NET && EVENTFD && EXPERIMENTAL
> + depends on NET && EVENTFD && TUN && EXPERIMENTAL
> ---help---
> This kernel module can be loaded in host kernel to accelerate
> guest networking with virtio_net. Not to be confused with virtio_net

In fact, vhost can be built with TUN=n VHOST_NET=y as well
(tun_get_socket is stubbed out in that case).
So I think this is better (it looks strange
until you realize that for tristate variables
boolean logic math does not apply):

--->
From: Michael S. Tsirkin <mst@redhat.com>
Subject: vhost: fix TUN=m VHOST_NET=y

drivers/built-in.o: In function `get_tun_socket':
net.c:(.text+0x15436e): undefined reference to `tun_get_socket'

If tun is a module, vhost must be a module, too.
If tun is built-in or disabled, vhost can be built-in.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

---
diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig
index 9f409f4..9e93553 100644
--- a/drivers/vhost/Kconfig
+++ b/drivers/vhost/Kconfig
@@ -1,6 +1,6 @@
config VHOST_NET
tristate "Host kernel accelerator for virtio net (EXPERIMENTAL)"
- depends on NET && EVENTFD && EXPERIMENTAL
+ depends on NET && EVENTFD && (TUN || !TUN) && EXPERIMENTAL
---help---
This kernel module can be loaded in host kernel to accelerate
guest networking with virtio_net. Not to be confused with virtio_net

--
MST


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