datapath: improve l4_rxhash regex

Red Hat Enterprise Linux 6 has a comment saying
that it doesn't support l4_rxhash which matches
the current grep regex.

Signed-off-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>

diff --git a/acinclude.m4 b/acinclude.m4
index 45cfaf6..db0de0d 100644 (file)
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -381,7 +381,8 @@ AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
                   [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [l4_rxhash])
+  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u8.*l4_rxhash],
+                  [OVS_DEFINE([HAVE_L4_RXHASH])])
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])