netdev - Re: 2.6.29 regression? Bonding tied to IPV6 in 29-rc5

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Date:	Tue, 17 Feb 2009 22:56:55 +0200
From:	Thomas Backlund <tmb@...driva.org>
To:	Brian Haley <brian.haley@...com>
CC:	Andrey Borzenkov <arvidjaar@...l.ru>,
	"Rafael J. Wysocki" <rjw@...k.pl>, netdev@...r.kernel.org,
	bonding-devel@...ts.sourceforge.net,
	"J.A. Magallón" <jamagallon@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.29 regression? Bonding tied to IPV6 in 29-rc5

Brian Haley skrev:
> Andrey Borzenkov wrote:
>> On 17 of February 2009 20:01:38 Andrey Borzenkov wrote:
>>> Forward to bonding and netdev
>>>
>>> On 17 of February 2009 11:52:32 J.A. Magallón wrote:
>>>> Hi all...
>>>>
>>>> Don't know if this is specific for -rc5, I have jumped from 28.4 to
>>>> 29-rc5. In this latest kernel, I can not install 'bonding' module
>>>> if 'ipv6' is disabled to load via modprobe.conf:
>>>>
>>>> install ipv6 /bin/true
>>>>
>>>> Trying bonding gives this dmesg:
>>>>
>>>> bonding: Unknown symbol ndisc_build_skb
>>>> bonding: Unknown symbol in6_dev_finish_destroy
>>>> bonding: Unknown symbol ndisc_send_skb
>>>> bonding: Unknown symbol unregister_inet6addr_notifier
>>>> bonding: Unknown symbol register_inet6addr_notifier
>>>>
>>>> Commenting the line in modprobe.conf makes things smooth again.
>>>> We can not disable ipv6 anymore ?
>>> If IPv6 is disable in kernel config bonding loads. But I think it is
>>> regression, it should be possible to disable IPv6 if not required.
>>
>> This hard dependency was apparently introduced by this commit:
>>
>> commit 305d552accae6afb859c493ebc7d98ca3371dae2
>> Author: Brian Haley <brian.haley@...com>
>> Date:   Tue Nov 4 17:51:14 2008 -0800
>>
>>     bonding: send IPv6 neighbor advertisement on failover
> 
> I initially had bonding IPv6 support as a Kconfig option, but it was 
> decided it would be cleaner if it just got built-in whenever CONFIG_IPV6 
> was set like SCTP, with the assumption you might want it.
> 
> Is it a common configuration to not allow a module to load like you're 
> doing in modprobe.conf?  I don't know how hard it would be to rip this 

Yep.

> out into it's own bonding_ipv6.ko module, simply turning-off CONFIG_IPV6 
> seems better.

That's not an option for distro kernels ...

--
Thomas
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