+# LIBCFS_NEW_KERNEL_WRITE
+#
+# Kernel version 4.14 e13ec939e96b13e664bb6cee361cc976a0ee621a
+# changed kernel_write prototype to make is plug compatible
+# with the unexported vfs_write()
+#
+AC_DEFUN([LIBCFS_NEW_KERNEL_WRITE], [
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_CHECK_COMPILE([if 'kernel_write' matches other read/write helpers],
+kernel_write_match, [
+ #include <linux/fs.h>
+],[
+ const void *buf = NULL;
+ loff_t pos = 0;
+ return kernel_write(NULL, buf, 0, &pos);
+],[
+ AC_DEFINE(HAVE_NEW_KERNEL_WRITE, 1,
+ ['kernel_write' aligns with read/write helpers])
+])
+EXTRA_KCFLAGS="$tmp_flags"
+]) # LIBCFS_NEW_KERNEL_WRITE
+
+#
+# LIBCFS_TIMER_SETUP
+#
+# Kernel version 4.15 commit e99e88a9d2b067465adaa9c111ada99a041bef9a
+# setup_timer() was replaced by timer_setup(), where the callback
+# argument is the structure already holding the struct timer_list.
+#
+AC_DEFUN([LIBCFS_TIMER_SETUP], [
+LB_CHECK_COMPILE([if setup_timer has been replaced with timer_setup],
+timer_setup, [
+ #include <linux/timer.h>
+],[
+ timer_setup(NULL, NULL, 0);
+],[
+ AC_DEFINE(HAVE_TIMER_SETUP, 1,
+ [timer_setup has replaced setup_timer])
+])
+]) # LIBCFS_TIMER_SETUP
+
+#