netdev - [PATCH net-next] geneve: fix build with modular IPV6

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Message-Id: <20180426103636.16113-1-tobias.regnery@gmail.com>
Date:   Thu, 26 Apr 2018 12:36:36 +0200
From:   Tobias Regnery <tobias.regnery@...il.com>
To:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     alexey.kodanev@...cle.com,
        Tobias Regnery <tobias.regnery@...il.com>
Subject: [PATCH net-next] geneve: fix build with modular IPV6

Commit c40e89fd358e ("geneve: configure MTU based on a lower device") added
an IS_ENABLED(CONFIG_IPV6) to geneve, leading to the following link error
with CONFIG_GENEVE=y and CONFIG_IPV6=m:

drivers/net/geneve.o: In function `geneve_link_config':
geneve.c:(.text+0x14c): undefined reference to `rt6_lookup'

Fix this by adding a Kconfig dependency and forcing GENEVE to be a module
when IPV6 is a module.

Fixes: c40e89fd358e ("geneve: configure MTU based on a lower device")
Signed-off-by: Tobias Regnery <tobias.regnery@...il.com>
---
 drivers/net/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 891846655000..a029b27fd002 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -198,6 +198,7 @@ config VXLAN
 config GENEVE
        tristate "Generic Network Virtualization Encapsulation"
        depends on INET && NET_UDP_TUNNEL
+       depends on IPV6 || !IPV6
        select NET_IP_TUNNEL
        select GRO_CELLS
        ---help---
-- 
2.17.0