acinclude: Check for extended netlink ack presence
RTNL ops validate and newlink now include the extended netlink
ack feature.  Check for it and set HAVE_EXT_ACK_IN_RTNL_LINKOPS
if found.
@@ -772,6 +772,9 @@ AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
[OVS_DEFINE([HAVE_SKB_GSO_UDP])])
OVS_GREP_IFELSE([$KSRC/include/net/dst.h],[DST_NOCACHE],
[OVS_DEFINE([HAVE_DST_NOCACHE])])
+ OVS_FIND_FIELD_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_link_ops],
+ [extack],
+ [OVS_DEFINE([HAVE_EXT_ACK_IN_RTNL_LINKOPS])])
if cmp -s datapath/linux/kcompat.h.new \
datapath/linux/kcompat.h >/dev/null 2>&1; then
