title: Linux sched folder is empty
body: <p>When I do <code>ls /usr/src/linux-headers-4.10.0-38-generic/include/linux/sched</code> I get the following results:</p>
  
  <pre><code>deadline.h  jobctl.h  prio.h  rt.h  sysctl.h  task.h
  </code></pre>
  
  <p>There are obviously some files missing when I look at <a href="https://github.com/torvalds/linux/tree/master/include/linux/sched" rel="nofollow noreferrer">https://github.com/torvalds/linux/tree/master/include/linux/sched</a> </p>
  
  <p>Now in my project I want to use the <code>signal.h</code> file, but it tells me <code>fatal error: linux/sched/signal.h: No such file or directory</code> What am I doing wrong?</p>