netdev - Re: build breakage due to br_multicast.c referencing ipv6_dev_get

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Message-Id: <4D81CCF80200007800036FFD@vpn.id2.novell.com>
Date:	Thu, 17 Mar 2011 07:57:28 +0000
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Brian Haley" <brian.haley@...com>
Cc:	<davem@...emloft.net>, <shemminger@...ux-foundation.org>,
	<bridge@...ts.linux-foundation.org>, <netdev@...r.kernel.org>,
	<linus.luessing@....de>
Subject: Re: build breakage due to br_multicast.c referencing
	 ipv6_dev_get_saddr()

>>> On 16.03.11 at 18:34, Brian Haley <brian.haley@...com> wrote:
> On 03/16/2011 08:34 AM, Jan Beulich wrote:
>> With BRIDGE=y and IPV6=m commit
>> fe29ec41aaa51902aebd63658dfb04fe6fea8be5 ("bridge: Use IPv6
>> link-local address for multicast listener queries") causes the build to
>> break.
>> 
>> Similary, even if both are =m, but ipv6.ko got blacklisted (as is
>> happening in various SuSE distros when disabling IPv6), there's
>> a runtime problem since bridge.ko then won't load anymore due
>> to the missing symbol.
> 
> Load the ipv6 module with disable=1, which is why I added it :)

Indeed, I realized there is such an option only after I sent
that mail. Nevertheless, I think it is overkill to load a huge
module like this just to satisfy never actually used symbol
references.

In fact, just like it seems bogus to load ipv6.ko in a pure IPv4
environment, I think the opposite is also true: IPv4 support
should be in a module, and it should be possible to not load
it in a pure IPv6 environment.

Jan

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