linux-kernel - Re: [PATCHv9 3/3] vhost_net: a kernel-level virtio server

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Message-ID: <20091110113637.GB6989@redhat.com>
Date:	Tue, 10 Nov 2009 13:36:37 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, mingo@...e.hu,
	linux-mm@...ck.org, akpm@...ux-foundation.org, hpa@...or.com,
	gregory.haskins@...il.com, s.hetze@...ux-ag.com,
	Daniel Walker <dwalker@...o99.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [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@...tcorp.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@...hat.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@...hat.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


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