[net-next] l2tp: fix compile error when CONFIG_IPV6=m and CONFIG_L2TP=y

When CONFIG_IPV6=m and CONFIG_L2TP=y, I got the following compile error:

  LD      init/built-in.o
net/built-in.o: In function `l2tp_xmit_core':
l2tp_core.c:(.text+0x147781): undefined reference to `inet6_csk_xmit'
net/built-in.o: In function `l2tp_tunnel_create':
(.text+0x149067): undefined reference to `udpv6_encap_enable'
net/built-in.o: In function `l2tp_ip6_recvmsg':
l2tp_ip6.c:(.text+0x14e991): undefined reference to `ipv6_recv_error'
net/built-in.o: In function `l2tp_ip6_sendmsg':
l2tp_ip6.c:(.text+0x14ec64): undefined reference to `fl6_sock_lookup'
l2tp_ip6.c:(.text+0x14ed6b): undefined reference to `datagram_send_ctl'
l2tp_ip6.c:(.text+0x14eda0): undefined reference to `fl6_sock_lookup'
l2tp_ip6.c:(.text+0x14ede5): undefined reference to `fl6_merge_options'
l2tp_ip6.c:(.text+0x14edf4): undefined reference to `ipv6_fixup_options'
l2tp_ip6.c:(.text+0x14ee5d): undefined reference to `fl6_update_dst'
l2tp_ip6.c:(.text+0x14eea3): undefined reference to `ip6_dst_lookup_flow'
l2tp_ip6.c:(.text+0x14eee7): undefined reference to `ip6_dst_hoplimit'
l2tp_ip6.c:(.text+0x14ef8b): undefined reference to `ip6_append_data'
l2tp_ip6.c:(.text+0x14ef9d): undefined reference to `ip6_flush_pending_frames'
l2tp_ip6.c:(.text+0x14efe2): undefined reference to `ip6_push_pending_frames'
net/built-in.o: In function `l2tp_ip6_destroy_sock':
l2tp_ip6.c:(.text+0x14f090): undefined reference to `ip6_flush_pending_frames'
l2tp_ip6.c:(.text+0x14f0a0): undefined reference to `inet6_destroy_sock'
net/built-in.o: In function `l2tp_ip6_connect':
l2tp_ip6.c:(.text+0x14f14d): undefined reference to `ip6_datagram_connect'
net/built-in.o: In function `l2tp_ip6_bind':
l2tp_ip6.c:(.text+0x14f4fe): undefined reference to `ipv6_chk_addr'
net/built-in.o: In function `l2tp_ip6_init':
l2tp_ip6.c:(.init.text+0x73fa): undefined reference to `inet6_add_protocol'
l2tp_ip6.c:(.init.text+0x740c): undefined reference to `inet6_register_protosw'
net/built-in.o: In function `l2tp_ip6_exit':
l2tp_ip6.c:(.exit.text+0x1954): undefined reference to `inet6_unregister_protosw'
l2tp_ip6.c:(.exit.text+0x1965): undefined reference to `inet6_del_protocol'
net/built-in.o:(.rodata+0xf2d0): undefined reference to `inet6_release'
net/built-in.o:(.rodata+0xf2d8): undefined reference to `inet6_bind'
net/built-in.o:(.rodata+0xf308): undefined reference to `inet6_ioctl'
net/built-in.o:(.data+0x1af40): undefined reference to `ipv6_setsockopt'
net/built-in.o:(.data+0x1af48): undefined reference to `ipv6_getsockopt'
net/built-in.o:(.data+0x1af50): undefined reference to `compat_ipv6_setsockopt'
net/built-in.o:(.data+0x1af58): undefined reference to `compat_ipv6_getsockopt'
make: *** [vmlinux] Error 1

This is due to l2tp uses symbols from IPV6, so when l2tp is
builtin, IPV6 has to be builtin too.

Cc: David Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>

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From: Cong Wang <amwang@redhat.com>
Date: Tue, 18 Sep 2012 13:54:02 +0800

> When CONFIG_IPV6=m and CONFIG_L2TP=y, I got the following compile error:
 ...
> This is due to l2tp uses symbols from IPV6, so when l2tp is
> builtin, IPV6 has to be builtin too.
> 
> Cc: David Miller <davem@davemloft.net>
> Signed-off-by: Cong Wang <amwang@redhat.com>

The correct way to express this is:

	depends on (IPV6 || IPV6=n)

Which results in the KCONFIG option only being offers in modes
compatible with the dependency.  Using a 'select' doesn't work
properly in these kinds of cases.

Anyways, grep for that string to see how it is used in other similar
situations.

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On Wed, 2012-09-19 at 16:44 -0400, David Miller wrote:
> From: Cong Wang <amwang@redhat.com>
> Date: Tue, 18 Sep 2012 13:54:02 +0800
> 
> > When CONFIG_IPV6=m and CONFIG_L2TP=y, I got the following compile error:
>  ...
> > This is due to l2tp uses symbols from IPV6, so when l2tp is
> > builtin, IPV6 has to be builtin too.
> > 
> > Cc: David Miller <davem@davemloft.net>
> > Signed-off-by: Cong Wang <amwang@redhat.com>
> 
> The correct way to express this is:
> 
> 	depends on (IPV6 || IPV6=n)
> 
> Which results in the KCONFIG option only being offers in modes
> compatible with the dependency.  Using a 'select' doesn't work
> properly in these kinds of cases.
> 
> Anyways, grep for that string to see how it is used in other similar
> situations.
> 

Thanks for the hints! I will update this patch.


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