Merge tag 'trace-v4.17-rc4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fix from Steven Rostedt:
 "Some of the ftrace internal events use a zero for a data size of a
  field event. This is increasingly important for the histogram trigger
  work that is being extended.

  While auditing trace events, I found that a couple of the xen events
  were used as just marking that a function was called, by creating a
  static array of size zero. This can play havoc with the tracing
  features if these events are used, because a zero size of a static
  array is denoted as a special nul terminated dynamic array (this is
  what the trace_marker code uses). But since the xen events have no
  size, they are not nul terminated, and unexpected results may occur.

  As trace events were never intended on being a marker to denote that a
  function was hit or not, especially since function tracing and kprobes
  can trivially do the same, the best course of action is to simply
  remove ...