+#
+# LIBCFS_HAVE_NR_UNSTABLE_NFS
+#
+# kernel v5.8-rc1~201^2~75
+# mm/writeback: discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead
+#
+AC_DEFUN([LIBCFS_HAVE_NR_UNSTABLE_NFS], [
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_CHECK_COMPILE([if NR_UNSTABLE_NFS still in use],
+nr_unstable_nfs_exists, [
+ #include <linux/mm.h>
+
+ int i;
+],[
+ i = NR_UNSTABLE_NFS;
+],[
+ AC_DEFINE(HAVE_NR_UNSTABLE_NFS, 1,
+ [NR_UNSTABLE_NFS is still in use.])
+])
+EXTRA_KCFLAGS="$tmp_flags"
+]) # LIBCFS_HAVE_NR_UNSTABLE_NFS
+