+]) # LN_CONFIG_SOCK_GETNAME
+
+#
+# LN_HAVE_IN_DEV_FOR_EACH_IFA_RTNL
+#
+# kernel 5.3 commit ef11db3310e272d3d8dbe8739e0770820dd20e52
+# and kernel 4.18.0-193.el8:
+# added in_dev_for_each_ifa_rtnl and in_dev_for_each_ifa_rcu
+# and removed for_ifa and endfor_ifa.
+# Use the _rntl variant as the current locking is rtnl.
+#
+AC_DEFUN([LN_HAVE_IN_DEV_FOR_EACH_IFA_RTNL], [
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_CHECK_COMPILE([if 'in_dev_for_each_ifa_rtnl' is defined],
+in_dev_for_each_ifa_rtnl_test, [
+ #include <linux/inetdevice.h>
+],[
+ const struct in_ifaddr *ifa = NULL;
+ struct in_device *in_dev = NULL;
+
+ in_dev_for_each_ifa_rtnl(ifa, in_dev) {}
+],[
+ AC_DEFINE(HAVE_IN_DEV_FOR_EACH_IFA_RTNL, 1,
+ ['in_dev_for_each_ifa_rtnl' is defined])
+])
+EXTRA_KCFLAGS="$tmp_flags"
+]) # LN_HAVE_IN_DEV_FOR_EACH_IFA_RTNL
+
+#
+# LN_IB_DEVICE_OPS_EXISTS
+#
+# kernel 5.0 commit 521ed0d92ab0db3edd17a5f4716b7f698f4fce61
+# RDMA/core: Introduce ib_device_ops
+# ... introduces the ib_device_ops structure that defines all the
+# InfiniBand device operations in one place ...
+#
+AC_DEFUN([LN_IB_DEVICE_OPS_EXISTS], [
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_CHECK_COMPILE([if struct ib_device_ops is defined],
+ib_device_ops_test, [
+ #include <rdma/ib_verbs.h>
+],[
+ int x = offsetof(struct ib_device_ops, unmap_fmr);
+ x = x;
+ (void)x;
+],[
+ AC_DEFINE(HAVE_IB_DEVICE_OPS, 1,
+ [if struct ib_device_ops is defined])
+])
+EXTRA_KCFLAGS="$tmp_flags"
+]) # LN_IB_DEVICE_OPS_EXISTS
+
+#
+# LN_IB_SG_DMA_ADDRESS_EXISTS
+#
+# kernel 5.1 commit a163afc88556e099271a7b423295bc5176fcecce
+# IB/core: Remove ib_sg_dma_address() and ib_sg_dma_len()
+# ... when dma_ops existed (3.6) ib_sg_dma_address() was not trivial ...
+#
+AC_DEFUN([LN_IB_SG_DMA_ADDRESS_EXISTS], [
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_CHECK_COMPILE([if ib_sg_dma_address wrapper exists],
+ib_sg_dma_address_test, [
+ #include <rdma/ib_verbs.h>
+],[
+ u64 x = ib_sg_dma_address(NULL, NULL);
+ x = x;
+ (void)x;
+],[
+ AC_DEFINE(HAVE_IB_SG_DMA_ADDRESS, 1,
+ [if ib_sg_dma_address wrapper exists])
+])
+EXTRA_KCFLAGS="$tmp_flags"
+]) # LN_IB_SG_DMA_ADDRESS_EXISTS
+
+#
+# LN_USR_RDMA
+#
+#
+AC_DEFUN([LN_USR_RDMA], [
+AC_MSG_CHECKING([if RDMA_PS_TCP exists])
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([
+ #include <rdma/rdma_user_cm.h>
+
+ int main(void) {
+ int x = (int)RDMA_PS_TCP;
+ return x;
+ }
+])],[
+ AC_DEFINE(HAVE_USRSPC_RDMA_PS_TCP, 1,
+ [RDMA_PS_TCP exists])
+])
+]) # LN_USR_RDMA
+
+
+AC_DEFUN([LN_PROG_LINUX_SRC], [])
+AC_DEFUN([LN_PROG_LINUX_RESULTS], [])