Fixes following compilation error:
In file included from ovs/datapath/linux/actions.c:30: 
ovs/datapath/linux/compat/include/linux/if_vlan.h:65:
error: redefinition of ‘__vlan_hwaccel_push_inside’ 
include/linux/if_vlan.h:353: note: previous definition of
‘__vlan_hwaccel_push_inside’ was here 
ovs/datapath/linux/compat/include/linux/if_vlan.h:83:

Signed-off-by: Pravin B Shelar <pshe...@nicira.com>
---
 .travis.yml                                   |    2 +-
 acinclude.m4                                  |    1 +
 datapath/linux/compat/include/linux/if_vlan.h |    3 ++-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index f4b9188..c721f53 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,7 +16,7 @@ env:
   - KERNEL=4.0.9
   - KERNEL=3.17.7 DPDK=1
   - KERNEL=3.17.7 DPDK=1 OPTS="--enable-shared"
-  - KERNEL=3.17.7
+  - KERNEL=3.18.21
   - KERNEL=3.16.7
   - KERNEL=3.14.27
   - KERNEL=3.12.35
diff --git a/acinclude.m4 b/acinclude.m4
index beb320b..df3e75e 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -323,6 +323,7 @@ AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
 
   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
+  OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_hwaccel_push_inside])
 
   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [proto_ports_offset])
diff --git a/datapath/linux/compat/include/linux/if_vlan.h 
b/datapath/linux/compat/include/linux/if_vlan.h
index 05c2876..060bb62 100644
--- a/datapath/linux/compat/include/linux/if_vlan.h
+++ b/datapath/linux/compat/include/linux/if_vlan.h
@@ -52,7 +52,8 @@ static inline struct sk_buff 
*rpl_vlan_insert_tag_set_proto(struct sk_buff *skb,
 }
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3,19,0)
+#ifndef HAVE_VLAN_HWACCEL_PUSH_INSIDE
+
 /*
  * __vlan_hwaccel_push_inside - pushes vlan tag to the payload
  * @skb: skbuff to tag
-- 
1.7.1

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