netdev - Build error v3.9-rc when CONFIG

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Date:	Sun, 14 Apr 2013 12:45:57 +0300
From:	Tomas Melin <tomas.melin@....fi>
To:	johannes@...solutions.net, davem@...emloft.net
Cc:	netdev@...r.kernel.org
Subject: Build error v3.9-rc when CONFIG_IPV6 configured as module

It seems CONFIG_IPV6 cannot be built as a module, using "m"-option
leads to to the following linking error:

net/built-in.o: In function `ieee80211_unregister_hw':
(.text+0x10f0e1): undefined reference to `unregister_inet6addr_notifier'
net/built-in.o: In function `ieee80211_register_hw':
(.text+0x10f610): undefined reference to `register_inet6addr_notifier'
make: *** [vmlinux] Error 1

This happens since the caller net/mac80211/main.c is statically built
in but net/ipv6/addrconf.c is then built as a module. Is this expected
behaviour or should it be fixed?

Configuration:  v3.9-rc6 with defconfig but ipv6 set to be a module
instead of built in.

-Tomas
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