[ovs-dev] [PATCH] datapath: Fix build failure on RHEL 6.4

[Pravin B Shelar]

Patch fixes following build failure:-

make[4]: Entering directory
`/usr/src/kernels/2.6.32-358.18.1.el6.x86_64'
  CC [M]  openvswitch/datapath/linux/actions.o
In file included from
openvswitch/datapath/linux/actions.c:21:
openvswitch/datapath/linux/compat/include/linux/skbuff.h:273:
error: redefinition of ‘__skb_fill_page_desc’
include/linux/skbuff.h:1123: note: previous definition of
‘__skb_fill_page_desc’ was here
-----

Signed-off-by: Pravin B Shelar <pshelar at nicira.com>
---
 acinclude.m4                                 |    1 +
 datapath/linux/compat/include/linux/skbuff.h |    2 +-
 2 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/acinclude.m4 b/acinclude.m4
index 2ca9311..321b3b0 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -256,6 +256,7 @@ AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
+  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
 
diff --git a/datapath/linux/compat/include/linux/skbuff.h b/datapath/linux/compat/include/linux/skbuff.h
index 41ec951..d1224ac 100644
--- a/datapath/linux/compat/include/linux/skbuff.h
+++ b/datapath/linux/compat/include/linux/skbuff.h
@@ -269,7 +269,7 @@ void skb_zerocopy(struct sk_buff *to, const struct sk_buff *from, int len,
 #define skb_has_frag_list skb_has_frags
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3,2,0)
+#ifndef HAVE___SKB_FILL_PAGE_DESC
 static inline void __skb_fill_page_desc(struct sk_buff *skb, int i,
 					struct page *page, int off, int size)
 {
-- 
1.7.1