diff mbox series

[ovs-dev,V5,5/6] acinclude.m4: Remove support for building the OVS kernel module.

Message ID 20220713223642.10767-6-gvrose8192@gmail.com
State Superseded
Headers show
Series Remove OVS kernel driver | expand

Checks

Context Check Description
ovsrobot/apply-robot warning apply and check: warning
ovsrobot/intel-ovs-compilation fail test: fail

Commit Message

Gregory Rose July 13, 2022, 10:36 p.m. UTC 
Since the openvswitch project inception it has had support for building
a Linux kernel module to support the OVS kernel datapath.  Since Linux
kernel release 5.8 support for newer kernels has been deprecated.  Now
is the time to fully discontinue support for building the openvswitch
kernel driver. Since Linux 5.9 the Linux built-in openvswitch kernel
driver supports all necessary features and functions of the kernel
datapath and the need to support this additional "out of tree" kernel
module is gone.

Remove the --with-linux configuration support from the acinclude.m4
configuration and warn user it is not supported any longer.

Signed-off-by: Greg Rose <gvrose8192@gmail.com>
---
 acinclude.m4 | 810 +--------------------------------------------------
 1 file changed, 1 insertion(+), 809 deletions(-)

Comments

0-day Robot July 13, 2022, 11:05 p.m. UTC | #1 
Bleep bloop.  Greetings Greg Rose, I am a robot and I have tried out your patch.
Thanks for your contribution.

I encountered some error that I wasn't expecting.  See the details below.


Patch skipped due to previous failure.

Please check this out.  If you feel there has been an error, please email aconole@redhat.com

Thanks,
0-day Robot
diff mbox series

Patch

diff --git a/acinclude.m4 b/acinclude.m4
index d15f11a4e..e20d61df4 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -119,133 +119,9 @@  dnl OVS_CHECK_LINUX
 dnl
 dnl Configure linux kernel source tree
 AC_DEFUN([OVS_CHECK_LINUX], [
-  AC_ARG_WITH([linux],
-              [AC_HELP_STRING([--with-linux=/path/to/linux],
-                              [Specify the Linux kernel build directory])])
-  AC_ARG_WITH([linux-source],
-              [AC_HELP_STRING([--with-linux-source=/path/to/linux-source],
-                              [Specify the Linux kernel source directory
-                               (usually figured out automatically from build
-                               directory)])])
-
-  # Deprecated equivalents to --with-linux, --with-linux-source.
-  AC_ARG_WITH([l26])
-  AC_ARG_WITH([l26-source])
-
   if test X"$with_linux" != X; then
-    KBUILD=$with_linux
-    AC_MSG_WARN([--with-linux is deprecated and kernel support is limited to 5.8 and below])
-  elif test X"$with_l26" != X; then
-    KBUILD=$with_l26
-    AC_MSG_WARN([--with-l26 is deprecated, please use --with-linux instead])
-  else
-    KBUILD=
-  fi
-
-  if test X"$KBUILD" != X; then
-    if test X"$with_linux_source" != X; then
-      KSRC=$with_linux_source
-    elif test X"$with_l26_source" != X; then
-      KSRC=$with_l26_source
-      AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
-    else
-      KSRC=
-    fi
-  elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
-    AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
-  fi
-
-  if test -n "$KBUILD"; then
-    KBUILD=`eval echo "$KBUILD"`
-    case $KBUILD in
-        /*) ;;
-        *) KBUILD=`pwd`/$KBUILD ;;
-    esac
-
-    # The build directory is what the user provided.
-    # Make sure that it exists.
-    AC_MSG_CHECKING([for Linux build directory])
-    if test -d "$KBUILD"; then
-        AC_MSG_RESULT([$KBUILD])
-        AC_SUBST(KBUILD)
-    else
-        AC_MSG_RESULT([no])
-        AC_ERROR([source dir $KBUILD doesn't exist])
-    fi
-
-    # Debian breaks kernel headers into "source" header and "build" headers.
-    # We want the source headers, but $KBUILD gives us the "build" headers.
-    # Use heuristics to find the source headers.
-    AC_MSG_CHECKING([for Linux source directory])
-    if test -n "$KSRC"; then
-      KSRC=`eval echo "$KSRC"`
-      case $KSRC in
-          /*) ;;
-          *) KSRC=`pwd`/$KSRC ;;
-      esac
-      if test ! -e $KSRC/include/linux/kernel.h; then
-        AC_MSG_ERROR([$KSRC is not a kernel source directory])
-      fi
-    else
-      KSRC=$KBUILD
-      if test ! -e $KSRC/include/linux/kernel.h; then
-        # Debian kernel build Makefiles tend to include a line of the form:
-        # MAKEARGS := -C /usr/src/linux-headers-3.2.0-1-common O=/usr/src/linux-headers-3.2.0-1-486
-        # First try to extract the source directory from this line.
-        KSRC=`sed -n 's/.*-C \([[^ ]]*\).*/\1/p' "$KBUILD"/Makefile`
-        if test ! -e "$KSRC"/include/linux/kernel.h; then
-          # Didn't work.  Fall back to name-based heuristics that used to work.
-          case `echo "$KBUILD" | sed 's,/*$,,'` in # (
-            */build)
-              KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
-              ;; # (
-            *)
-              KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
-              ;;
-          esac
-        fi
-      fi
-      if test ! -e "$KSRC"/include/linux/kernel.h; then
-        AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
-      fi
-    fi
-    AC_MSG_RESULT([$KSRC])
-
-    AC_MSG_CHECKING([for kernel version])
-    version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
-    patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
-    sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
-    if test X"$version" = X || test X"$patchlevel" = X; then
-       AC_ERROR([cannot determine kernel version])
-    elif test X"$sublevel" = X; then
-       kversion=$version.$patchlevel
-    else
-       kversion=$version.$patchlevel.$sublevel
-    fi
-    AC_MSG_RESULT([$kversion])
-
-    if test "$version" -ge 5; then
-       if test "$version" = 5 && test "$patchlevel" -le 8; then
-          : # Linux 5.x
-       else
-          AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 5.8.x is not supported (please refer to the FAQ for advice)])
-       fi
-    elif test "$version" = 4; then
-       : # Linux 4.x
-    elif test "$version" = 3 && test "$patchlevel" -ge 10; then
-       : # Linux 3.x
-    else
-       AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 3.10 or later is required])
-    fi
-    if (test ! -e "$KBUILD"/include/linux/version.h && \
-        test ! -e "$KBUILD"/include/generated/uapi/linux/version.h)|| \
-       (test ! -e "$KBUILD"/include/linux/autoconf.h && \
-        test ! -e "$KBUILD"/include/generated/autoconf.h); then
-        AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
-    fi
-    OVS_CHECK_LINUX_COMPAT
+    AC_MSG_WARN([--with-linux is no longer supported])
   fi
-  AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
 ])
 
 dnl OVS_CHECK_LINUX_NETLINK
@@ -543,690 +419,6 @@  AC_DEFUN([OVS_CHECK_DPDK], [
   AM_CONDITIONAL([DPDK_NETDEV], test "$DPDKLIB_FOUND" = true)
 ])
 
-dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
-dnl
-dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
-dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
-dnl <REGEX> translated to uppercase.
-AC_DEFUN([OVS_GREP_IFELSE], [
-  AC_MSG_CHECKING([whether $2 matches in $1])
-  if test -f $1; then
-    grep '$2' $1 >/dev/null 2>&1
-    status=$?
-    case $status in
-      0)
-        AC_MSG_RESULT([yes])
-        m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
-        ;;
-      1)
-        AC_MSG_RESULT([no])
-        $4
-        ;;
-      *)
-        AC_MSG_ERROR([grep exited with status $status])
-        ;;
-    esac
-  else
-    AC_MSG_RESULT([file not found])
-    $4
-  fi
-])
-
-dnl OVS_FIND_FIELD_IFELSE(FILE, STRUCTURE, REGEX, [IF-MATCH], [IF-NO-MATCH])
-dnl
-dnl Looks for STRUCTURE in FILE. If it is found, greps for REGEX within the
-dnl structure definition. If this is successful, runs IF-MATCH, otherwise
-dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
-dnl OVS_DEFINE(HAVE_<STRUCTURE>_WITH_<REGEX>), with <STRUCTURE> and <REGEX>
-dnl translated to uppercase.
-AC_DEFUN([OVS_FIND_FIELD_IFELSE], [
-  AC_MSG_CHECKING([whether $2 has member $3 in $1])
-  if test -f $1; then
-    awk '/$2.{/,/^}/' $1 2>/dev/null | grep '$3' >/dev/null
-    status=$?
-    case $status in
-      0)
-        AC_MSG_RESULT([yes])
-        m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
-        ;;
-      1)
-        AC_MSG_RESULT([no])
-        $5
-        ;;
-      *)
-        AC_MSG_ERROR([grep exited with status $status])
-        ;;
-    esac
-  else
-    AC_MSG_RESULT([file not found])
-    $5
-  fi
-])
-
-dnl OVS_FIND_PARAM_IFELSE(FILE, FUNCTION, REGEX, [IF-MATCH], [IF-NO-MATCH])
-dnl
-dnl Looks for FUNCTION in FILE. If it is found, greps for REGEX within
-dnl the function signature starting from the line matching FUNCTION
-dnl and ending with the line containing the closing parenthesis.  If
-dnl this is successful, runs IF-MATCH, otherwise IF_NO_MATCH.  If
-dnl IF-MATCH is empty then it defines to
-dnl OVS_DEFINE(HAVE_<FUNCTION>_WITH_<REGEX>), with <FUNCTION> and
-dnl <REGEX> translated to uppercase.
-AC_DEFUN([OVS_FIND_PARAM_IFELSE], [
-  AC_MSG_CHECKING([whether $2 has parameter $3 in $1])
-  if test -f $1; then
-    awk '/$2[[ \t\n]]*\(/,/\)/' $1 2>/dev/null | grep '$3' >/dev/null
-    status=$?
-    case $status in
-      0)
-        AC_MSG_RESULT([yes])
-        m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
-        ;;
-      1)
-        AC_MSG_RESULT([no])
-        $5
-        ;;
-      *)
-        AC_MSG_ERROR([grep exited with status $status])
-        ;;
-    esac
-  else
-    AC_MSG_RESULT([file not found])
-    $5
-  fi
-])
-
-dnl OVS_FIND_OP_PARAM_IFELSE(FILE, OP, REGEX, [IF-MATCH], [IF-NO-MATCH])
-dnl
-dnl Looks for OP in FILE. If it is found, greps for REGEX within the
-dnl OP definition. If this is successful, runs IF-MATCH, otherwise
-dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
-dnl OVS_DEFINE(HAVE_<OP>_WITH_<REGEX>), with <OP> and <REGEX>
-dnl translated to uppercase.
-AC_DEFUN([OVS_FIND_OP_PARAM_IFELSE], [
-  AC_MSG_CHECKING([whether $2 has member $3 in $1])
-  if test -f $1; then
-    awk '/$2[[ \t\n]]*\)\(/,/;/' $1 2>/dev/null | grep '$3' >/dev/null
-    status=$?
-    case $status in
-      0)
-        AC_MSG_RESULT([yes])
-        m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
-        ;;
-      1)
-        AC_MSG_RESULT([no])
-        $5
-        ;;
-      *)
-        AC_MSG_ERROR([grep exited with status $status])
-        ;;
-    esac
-  else
-    AC_MSG_RESULT([file not found])
-    $5
-  fi
-])
-
-dnl OVS_DEFINE(NAME)
-dnl
-dnl Defines NAME to 1 in kcompat.h.
-AC_DEFUN([OVS_DEFINE], [
-  echo '#define $1 1' >> datapath/linux/kcompat.h.new
-])
-
-dnl OVS_CHECK_LINUX_COMPAT
-dnl
-dnl Runs various Autoconf checks on the Linux kernel source in
-dnl the directory in $KBUILD.
-AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
-  rm -f datapath/linux/kcompat.h.new
-  mkdir -p datapath/linux
-  : > datapath/linux/kcompat.h.new
-
-  echo '#include <linux/version.h>
-#ifndef RHEL_RELEASE_CODE
-#define RHEL_RELEASE_CODE 0
-#define RHEL_RELEASE_VERSION(a, b) 0
-#endif' >> datapath/linux/kcompat.h.new
-
-  OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
-                  [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
-
-  OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6_get_cookie],
-                  [OVS_DEFINE([HAVE_RT6_GET_COOKIE])])
-
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_stub],
-                        [dst_entry])
-  OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup.*net],
-                  [OVS_DEFINE([HAVE_IPV6_DST_LOOKUP_NET])])
-  OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup_flow.*net],
-                  [OVS_DEFINE([HAVE_IPV6_DST_LOOKUP_FLOW_NET])])
-  OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_stub])
-  OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup_flow])
-
-  OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
-  OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
-  OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [PTR_ERR_OR_ZERO])
-
-  OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h], [static_branch_unlikely(],
-                  [OVS_DEFINE([HAVE_UPSTREAM_STATIC_KEY])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h], [DEFINE_STATIC_KEY_FALSE],
-                  [OVS_DEFINE([HAVE_DEFINE_STATIC_KEY])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h],
-                  [DECLARE_STATIC_KEY_FALSE],
-                  [OVS_DEFINE([HAVE_DECLARE_STATIC_KEY])])
-
-  OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
-  OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
-
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [IFLA_GENEVE_TOS])
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [rtnl_link_stats64])
-  OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
-  OVS_GREP_IFELSE([$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/if_vlan.h], [__vlan_hwaccel_clear_tag])
-
-  OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
-  OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [proto_ports_offset])
-  OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
-                  [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
-  OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*net],
-                  [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_NET])])
-
-  OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [inet_get_local_port_range.*net],
-                  [OVS_DEFINE([HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET])])
-  OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_defrag.*net],
-                  [OVS_DEFINE([HAVE_IP_DEFRAG_TAKES_NET])])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
-                        [ip_do_fragment], [net],
-                        [OVS_DEFINE([HAVE_IP_DO_FRAGMENT_TAKES_NET])])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
-                        [ip_local_out], [net],
-                        [OVS_DEFINE([HAVE_IP_LOCAL_OUT_TAKES_NET])])
-
-  OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_skb_dst_mtu])
-
-  OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [IPSKB_FRAG_PMTU],
-                  [OVS_DEFINE([HAVE_CORRECT_MRU_HANDLING])])
-  OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h], [__ip_tunnel_change_mtu])
-  OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [hashfn.*const],
-                  [OVS_DEFINE([HAVE_INET_FRAGS_CONST])])
-  OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [last_in],
-                  [OVS_DEFINE([HAVE_INET_FRAGS_LAST_IN])])
-  OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evicting])
-  OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evictor])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
-                        [frags_work])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
-                        [rwlock])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_queue],
-                        [list_evictor])
-  OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_lru_move])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/inet_frag.h],
-                        [sub_frag_mem_limit], [struct.netns_frags],
-                        [OVS_DEFINE([HAVE_SUB_FRAG_MEM_LIMIT_ARG_STRUCT_NETNS_FRAGS])])
-  OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [void.*inet_frags_init],
-                  [OVS_DEFINE([HAVE_VOID_INET_FRAGS_INIT])])
-  OVS_GREP_IFELSE([$KSRC/include/net/inetpeer.h], [vif],
-                  [OVS_DEFINE([HAVE_INETPEER_VIF_SUPPORT])])
-
-  dnl Check for dst_cache and ipv6 lable to use backported tunnel infrastructure.
-  dnl OVS does not really need ipv6 label field, but its presence signifies that
-  dnl the stack has all required ipv6 support.
-  dnl OVS also does not need dst_cache But this dependency allows us to write
-  dnl much cleaner code.
-
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip_tunnels.h], [ip_tunnel_key],
-                        [label],
-                        [OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h],
-                                         [iptunnel_pull_offloads],
-                        [OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
-                        [OVS_GREP_IFELSE([$KSRC/include/net/erspan.h], [erspan_md2],
-                                         [OVS_DEFINE([USE_UPSTREAM_TUNNEL])])])])])
-
-  OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
-                  [OVS_DEFINE([USE_BUILTIN_DST_CACHE])])
-  OVS_GREP_IFELSE([$KSRC/include/net/mpls.h], [mpls_hdr],
-                  [OVS_DEFINE([MPLS_HEADER_IS_L3])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/net.h], [sock_create_kern.*net],
-                  [OVS_DEFINE([HAVE_SOCK_CREATE_KERN_NET])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_fill_metadata_dst])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_recursion_level])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_gso_error_unwind])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_get_iflink])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_features_check],
-                  [OVS_DEFINE([USE_UPSTREAM_TUNNEL_GSO])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_vxlan_port])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_geneve_port])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_udp_tunnel_add])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
-  dnl Ubuntu kernel 3.13 has defined this struct but not used for netdev->tstats.
-  dnl So check type of tstats.
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats.*tstats],
-                  [OVS_DEFINE([HAVE_PCPU_SW_NETSTATS])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netif_needs_gso.*net_device],
-                  [OVS_DEFINE([HAVE_NETIF_NEEDS_GSO_NETDEV])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_csum_hwoffload_help])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload.*uoff],
-                  [OVS_DEFINE([HAVE_UDP_OFFLOAD_ARG_UOFF])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [gro_remcsum])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [IFF_PHONY_HEADROOM])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
-                        [extended])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
-                        [netdev_master_upper_dev_link], [upper_priv],
-                        [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_PRIV])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
-                  [netdev_master_upper_dev_link_rh],
-                  [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_RH])])
-
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
-                        [max_mtu])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops_extended],
-                        [ndo_change_mtu], [OVS_DEFINE([HAVE_RHEL7_MAX_MTU])])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
-                        [dev_change_flags], [extack],
-                        [OVS_DEFINE([HAVE_DEV_CHANGE_FLAGS_TAKES_EXTACK])])
-
-  OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state],
-                        [struct net ], [OVS_DEFINE([HAVE_NF_HOOK_STATE_NET])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_register_net_hook])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn.*nf_hook_ops],
-                  [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_OPS])])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn], [priv],
-                  [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_PRIV])])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
-                        [owner], [OVS_DEFINE([HAVE_NF_HOOKS_OPS_OWNER])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [NFPROTO_INET])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [CONFIG_NF_NAT_NEEDED])
-
-
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter_ipv6.h], [nf_ipv6_ops],
-                        [fragment.*sock], [OVS_DEFINE([HAVE_NF_IPV6_OPS_FRAGMENT])])
-
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
-                        [nf_conn], [struct timer_list[[ \t]]*timeout],
-                        [OVS_DEFINE([HAVE_NF_CONN_TIMER])])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
-                  [nf_ct_delete(], [OVS_DEFINE([HAVE_NF_CT_DELETE])])
-
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
-                  [nf_ct_tmpl_alloc], [nf_conntrack_zone],
-                  [OVS_DEFINE([HAVE_NF_CT_TMPL_ALLOC_TAKES_STRUCT_ZONE])])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
-                  [nf_ct_get_tuplepr], [struct.net],
-                  [OVS_DEFINE([HAVE_NF_CT_GET_TUPLEPR_TAKES_STRUCT_NET])])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
-                  [nf_ct_set])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
-                  [nf_ct_is_untracked])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
-                  [nf_ct_invert_tuplepr])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_zones.h],
-                  [nf_ct_zone_init])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_l3proto.h],
-                  [net_ns_get])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
-                  [nf_connlabels_get])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
-                  [nf_connlabels_get], [int bit],
-                  [OVS_DEFINE([HAVE_NF_CONNLABELS_GET_TAKES_BIT])])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
-                        [nf_conn_labels], [words])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_ct_nat_ext_add])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_alloc_null_binding])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_range2])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_packet],
-                  [OVS_DEFINE([HAVE_UPSTREAM_NF_NAT])])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_seqadj.h], [nf_ct_seq_adjust])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_count.h], [nf_conncount_gc_list],
-                  [OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_count.h],
-                                   [int nf_conncount_add],
-                                   [], [OVS_DEFINE([HAVE_UPSTREAM_NF_CONNCOUNT])])])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_timeout.h], [nf_ct_set_timeout])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_timeout.h], [struct nf_ct_timeout],
-                  [OVS_DEFINE([HAVE_NF_CT_TIMEOUT])])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_timeout.h],
-                        [\(*nf_ct_timeout_find_get_hook\)], [net],
-                        [OVS_DEFINE([HAVE_NF_CT_TIMEOUT_FIND_GET_HOOK_NET])])
-
-  OVS_GREP_IFELSE([$KSRC/include/linux/random.h],
-                  [prandom_u32[[\(]]],
-                  [OVS_DEFINE([HAVE_PRANDOM_U32])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32_max])
-  OVS_GREP_IFELSE([$KSRC/include/linux/prandom.h],
-                  [prandom_u32[[\(]]],
-                  [OVS_DEFINE([HAVE_PRANDOM_U32])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/prandom.h], [prandom_u32_max])
-
-  OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [get_link_net])
-  OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [name_assign_type])
-  OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_create_link.*src_net],
-                  [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_SRC_NET])])
-  OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h], [possible_net_t])
-
-  OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
-                  [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
-                                   [rcu_read_lock_held])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
-  OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [net_rwsem])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/rtnetlink.h],
-                        [rtnl_create_link], [extack],
-                        [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_TAKES_EXTACK])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [nf_reset_ct])
-
-  # Check for the proto_data_valid member in struct sk_buff.  The [^@]
-  # is necessary because some versions of this header remove the
-  # member but retain the kerneldoc comment that describes it (which
-  # starts with @).  The brackets must be doubled because of m4
-  # quoting rules.
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
-                  [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_checksum_start_offset])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol_type])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_inner_transport_offset])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [kfree_skb_list])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
-                  [OVS_DEFINE([HAVE_U16_RXHASH])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
-                  [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
-                  [skb_copy_from_linear_data_offset])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
-                  [skb_reset_tail_pointer])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
-                  [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([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
-  OVS_GREP_IFELSE([$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])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash(],
-                  [OVS_DEFINE([HAVE_SKB_GET_HASH])])
-  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([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_vlan_pop])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash_if_not_l4])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_postpush_rcsum])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [lco_csum])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_nfct])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_put_zero])
-
-  OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
-                  [OVS_DEFINE([HAVE_CSUM_TYPES])])
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
-                  [OVS_DEFINE([HAVE_CSUM_TYPES])])
-
-  OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
-  OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
-
-  OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [dst_discard_sk])
-  OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [__skb_dst_copy])
-
-  OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
-  OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
-  OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
-  OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
-                  [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
-  OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
-  OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_notify.*family],
-                  [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_FAMILY])])
-  OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_validate_flags])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/genetlink.h],
-                        [genl_notify], [net],
-                        [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_NET])])
-
-
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h],
-                        [genl_multicast_group], [id])
-  OVS_GREP_IFELSE([$KSRC/include/net/geneve.h], [geneve_hdr])
-
-  OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
-  OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_handle_offloads])
-  OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
-  OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [ip6_local_out_sk])
-  OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [__ipv6_addr_jhash])
-  OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6i.*u.dst],
-                  [OVS_DEFINE([HAVE_RT6INFO_DST_UNION])])
-  OVS_GREP_IFELSE([$KSRC/include/net/ip6_route.h], [ip6_frag.*sock],
-                  [OVS_DEFINE([HAVE_IP_FRAGMENT_TAKES_SOCK])])
-
-  OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_64bit])
-  OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
-  OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
-  OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
-  OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
-  OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_in_addr])
-  OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
-  OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
-  OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_nest_start_noflag])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netlink.h], [void.*netlink_set_err],
-                  [OVS_DEFINE([HAVE_VOID_NETLINK_SET_ERR])])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netlink.h],
-                        [nla_parse], [netlink_ext_ack],
-                        [OVS_DEFINE([HAVE_NETLINK_EXT_ACK])])
-
-  OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
-
-  OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
-  OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
-  OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_get_protocol])
-  OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [skb_vlan_tagged])
-  OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [eth_type_vlan])
-
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/dst_metadata.h],
-                        [metadata_dst_alloc], [metadata_type])
-
-  OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
-
-  OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
-                  [OVS_DEFINE([HAVE_VXLAN_METADATA])])
-  OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
-                  [OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [inet_get_local_port_range(net],
-                                   [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])])
-  OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_v4_check])
-  OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_gro_complete])
-  OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [sk_buff.*udp_tunnel_handle_offloads],
-                  [OVS_DEFINE([HAVE_UDP_TUNNEL_HANDLE_OFFLOAD_RET_SKB])])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_sock_cfg],
-                        [gro_receive])
-
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df],
-                  [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
-                  [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
-
-  OVS_GREP_IFELSE([$KSRC/include/net/sock.h], [sk_no_check_tx])
-  OVS_GREP_IFELSE([$KSRC/include/linux/udp.h], [no_check6_tx])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/protocol.h],
-                        [udp_add_offload], [net],
-                        [OVS_DEFINE([HAVE_UDP_ADD_OFFLOAD_TAKES_NET])])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/ipv6/nf_defrag_ipv6.h],
-                        [nf_defrag_ipv6_enable], [net],
-                        [OVS_DEFINE([HAVE_DEFRAG_ENABLE_TAKES_NET])])
-  OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [family_list],
-                        [OVS_DEFINE([HAVE_GENL_FAMILY_LIST])])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
-                        [needs_free_netdev],
-                        [OVS_DEFINE([HAVE_NEEDS_FREE_NETDEV])])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/vxlan.h], [vxlan_dev], [cfg],
-                        [OVS_DEFINE([HAVE_VXLAN_DEV_CFG])])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
-                  [nf_conntrack_helper_put],
-                  [OVS_DEFINE(HAVE_NF_CONNTRACK_HELPER_PUT)])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
-                  [nf_nat_helper_try_module_get])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
-                  [nf_nat_helper_put])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],[[[[:space:]]]SKB_GSO_UDP[[[:space:]]]],
-                  [OVS_DEFINE([HAVE_SKB_GSO_UDP])])
-  OVS_GREP_IFELSE([$KSRC/include/net/dst.h],[DST_NOCACHE],
-                  [OVS_DEFINE([HAVE_DST_NOCACHE])])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_link_ops],
-                        [extack],
-                  [OVS_DEFINE([HAVE_EXT_ACK_IN_RTNL_LINKOPS])])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
-                        [list],
-                        [OVS_DEFINE([HAVE_LIST_IN_NF_HOOK_OPS])])
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netfilter/nf_conntrack_common.h],
-                  [IP_CT_UNTRACKED])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
-                        [netdev_master_upper_dev_link], [extack],
-                        [OVS_DEFINE([HAVE_UPPER_DEV_LINK_EXTACK])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/compiler_types.h],
-                  [__LINUX_COMPILER_TYPES_H],
-                  [OVS_DEFINE([HAVE_LINUX_COMPILER_TYPES_H])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
-                  [ktime_get_ts64],
-                  [OVS_DEFINE([HAVE_KTIME_GET_TS64])])
-  OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h],
-                  [EXPORT_SYMBOL_GPL(peernet2id_alloc)],
-                  [OVS_DEFINE([HAVE_PEERNET2ID_ALLOC])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
-                  [ktime_get_ns],
-                  [OVS_DEFINE([HAVE_KTIME_GET_NS])])
-  OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h],
-                  frag_percpu_counter_batch[],
-                  [OVS_DEFINE([HAVE_FRAG_PERCPU_COUNTER_BATCH])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
-                  [null_compute_pseudo],
-                  [OVS_DEFINE([HAVE_NULL_COMPUTE_PSEUDO])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
-                  [__skb_checksum_convert],
-                  [OVS_DEFINE([HAVE_SKB_CHECKSUM_CONVERT])])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
-                        [max_mtu],
-                        [OVS_DEFINE([HAVE_NET_DEVICE_MAX_MTU])])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip6_tunnel.h], [__ip6_tnl_parm],
-                        [erspan_ver],
-                        [OVS_DEFINE([HAVE_IP6_TNL_PARM_ERSPAN_VER])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
-                  [SKB_GSO_IPXIP6],
-                  [OVS_DEFINE([HAVE_SKB_GSO_IPXIP6])])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ipv6.h],
-                        [ip6_make_flowlabel], [fl6],
-                        [OVS_DEFINE([HAVE_IP6_MAKE_FLOWLABEL_FL6])])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ipv6.h], [netns_sysctl_ipv6],
-                        [auto_flowlabels],
-                        [OVS_DEFINE([HAVE_NETNS_SYSCTL_IPV6_AUTO_FLOWLABELS])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
-                  [netif_keep_dst],
-                  [OVS_DEFINE([HAVE_NETIF_KEEP_DST])])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
-                        [ndo_get_iflink],
-                        [OVS_DEFINE([HAVE_NDO_GET_IFLINK])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
-                  [skb_set_inner_ipproto],
-                  [OVS_DEFINE([HAVE_SKB_SET_INNER_IPPROTO])])
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
-                  [tunnel_encap_types],
-                  [OVS_DEFINE([HAVE_TUNNEL_ENCAP_TYPES])])
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
-                  [IFLA_IPTUN_ENCAP_TYPE],
-                  [OVS_DEFINE([HAVE_IFLA_IPTUN_ENCAP_TYPE])])
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
-                  [IFLA_IPTUN_COLLECT_METADATA],
-                  [OVS_DEFINE([HAVE_IFLA_IPTUN_COLLECT_METADATA])])
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
-                  [IFLA_GRE_ENCAP_DPORT])
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
-                  [IFLA_GRE_COLLECT_METADATA])
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
-                  [IFLA_GRE_IGNORE_DF])
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
-                  [IFLA_GRE_FWMARK])
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
-                  [IFLA_GRE_ERSPAN_INDEX])
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
-                  [IFLA_GRE_ERSPAN_HWID])
-  OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
-                  [IFLA_IPTUN_FWMARK])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/skbuff.h], [sk_buff],
-                        [csum_valid],
-                        [OVS_DEFINE([HAVE_SKBUFF_CSUM_VALID])])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/skbuff.h], [sk_buff],
-                        [vlan_present],
-                        [OVS_DEFINE([HAVE_SKBUFF_VLAN_PRESENT])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
-                  [skb_checksum_simple_validate])
-  OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
-                  [void.*ndo_get_stats64],
-                  [OVS_DEFINE([HAVE_VOID_NDO_GET_STATS64])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/timer.h], [init_timer_deferrable],
-                  [OVS_DEFINE([HAVE_INIT_TIMER_DEFERRABLE])])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip_tunnels.h],
-                        [ip_tunnel_info_opts_set], [flags],
-                        [OVS_DEFINE([HAVE_IP_TUNNEL_INFO_OPTS_SET_FLAGS])])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
-                        [rnd],
-                        [OVS_DEFINE([HAVE_INET_FRAGS_RND])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/overflow.h], [__LINUX_OVERFLOW_H],
-                  [OVS_DEFINE([HAVE_OVERFLOW_H])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/overflow.h], [struct_size],
-                  [OVS_DEFINE([HAVE_STRUCT_SIZE])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/mm.h], [kvmalloc_array],
-                  [OVS_DEFINE([HAVE_KVMALLOC_ARRAY])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/mm.h], [kvmalloc_node],
-                  [OVS_DEFINE([HAVE_KVMALLOC_NODE])])
-  OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_l3proto.h],
-                  [nf_conntrack_l3proto],
-                  [OVS_DEFINE([HAVE_NF_CONNTRACK_L3PROATO_H])])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_core.h],
-                        [nf_conntrack_in], [nf_hook_state],
-                        [OVS_DEFINE([HAVE_NF_CONNTRACK_IN_TAKES_NF_HOOK_STATE])])
-  OVS_GREP_IFELSE([$KSRC/include/net/ipv6_frag.h], [IP6_DEFRAG_CONNTRACK_IN],
-                  [OVS_DEFINE([HAVE_IPV6_FRAG_H])])
-  OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
-                        [nf_ct_helper_ext_add], [nf_conntrack_helper],
-                        [OVS_DEFINE([HAVE_NF_CT_HELPER_EXT_ADD_TAKES_HELPER])])
-  OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_calc_hlen],
-                  [OVS_DEFINE([HAVE_GRE_CALC_HLEN])])
-  OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [ip_gre_calc_hlen],
-                  [OVS_DEFINE([HAVE_IP_GRE_CALC_HLEN])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/rbtree.h], [rb_link_node_rcu],
-                  [OVS_DEFINE([HAVE_RBTREE_RB_LINK_NODE_RCU])])
-  OVS_GREP_IFELSE([$KSRC/include/net/dst_ops.h], [bool confirm_neigh],
-                  [OVS_DEFINE([HAVE_DST_OPS_CONFIRM_NEIGH])])
-  OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [fqdir],
-                  [OVS_DEFINE([HAVE_INET_FRAG_FQDIR])])
-  OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h], [genl_ops],
-                        [policy],
-                        [OVS_DEFINE([HAVE_GENL_OPS_POLICY])])
-  OVS_GREP_IFELSE([$KSRC/include/net/netlink.h],
-                  [nla_parse_deprecated_strict],
-                  [OVS_DEFINE([HAVE_NLA_PARSE_DEPRECATED_STRICT])])
-  OVS_FIND_OP_PARAM_IFELSE([$KSRC/include/net/rtnetlink.h],
-                           [validate], [extack],
-                           [OVS_DEFINE([HAVE_RTNLOP_VALIDATE_WITH_EXTACK])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
-                  [__skb_set_hash])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [sw_hash])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash_raw])
-
-  if cmp -s datapath/linux/kcompat.h.new \
-            datapath/linux/kcompat.h >/dev/null 2>&1; then
-    rm datapath/linux/kcompat.h.new
-  else
-    mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
-  fi
-])
-
 dnl Checks for net/if_dl.h.
 dnl
 dnl (We use this as a proxy for checking whether we're building on FreeBSD