netdev - Re: [Patch net-next] l2tp: fix compile error when CONFIG_IPV6=m and CONFIG

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Date:	Thu, 20 Sep 2012 15:36:54 +0800
From:	Cong Wang <amwang@...hat.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [Patch net-next] l2tp: fix compile error when CONFIG_IPV6=m and
 CONFIG_L2TP=y

On Wed, 2012-09-19 at 16:44 -0400, David Miller wrote:
> From: Cong Wang <amwang@...hat.com>
> Date: Tue, 18 Sep 2012 13:54:02 +0800
> 
> > When CONFIG_IPV6=m and CONFIG_L2TP=y, I got the following compile error:
>  ...
> > This is due to l2tp uses symbols from IPV6, so when l2tp is
> > builtin, IPV6 has to be builtin too.
> > 
> > Cc: David Miller <davem@...emloft.net>
> > Signed-off-by: Cong Wang <amwang@...hat.com>
> 
> The correct way to express this is:
> 
> 	depends on (IPV6 || IPV6=n)
> 
> Which results in the KCONFIG option only being offers in modes
> compatible with the dependency.  Using a 'select' doesn't work
> properly in these kinds of cases.
> 
> Anyways, grep for that string to see how it is used in other similar
> situations.
> 

Thanks for the hints! I will update this patch.


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