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

[Brian Haley]

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

-Brian
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