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Date:	Tue,  3 May 2016 17:19:57 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Tom Herbert <tom@...bertland.com>,
	Thomas Egerer <hakke_007@....de>,
	Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] gre6: add Kconfig dependency for NET_IPGRE_DEMUX

The ipv6 gre implementation was cleaned up to share more code
with the ipv4 version, but it can be enabled even when NET_IPGRE_DEMUX
is disabled, resulting in a link error:

net/built-in.o: In function `gre_rcv':
:(.text+0x17f5d0): undefined reference to `gre_parse_header'
ERROR: "gre_parse_header" [net/ipv6/ip6_gre.ko] undefined!

This adds a Kconfig dependency to prevent that now invalid
configuration.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Fixes: 308edfdf1563 ("gre6: Cleanup GREv6 receive path, call common GRE functions")
---
 net/ipv6/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index 11e875ffd7ac..3f8411328de5 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -218,6 +218,7 @@ config IPV6_GRE
 	tristate "IPv6: GRE tunnel"
 	select IPV6_TUNNEL
 	select NET_IP_TUNNEL
+	depends on NET_IPGRE_DEMUX
 	---help---
 	  Tunneling means encapsulating data of one protocol type within
 	  another protocol and sending it over a channel that understands the
-- 
2.7.0

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