netdev - Re: Build error v3.9-rc when CONFIG

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Message-ID: <1366016535.8361.2.camel@jlt4.sipsolutions.net>
Date:	Mon, 15 Apr 2013 11:02:15 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Tomas Melin <tomas.melin@....fi>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: Build error v3.9-rc when CONFIG_IPV6 configured as module

On Sun, 2013-04-14 at 12:45 +0300, Tomas Melin wrote:
> 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.

Oops, I didn't realize that IPv6 could even (still) be built as a
module. I'll add this to mac80211's Kconfig:
	depends on IPV6 || !IPV6
to fix this.

johannes

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