title: module_layout version incompatibility
body: <p>I try to insmod a linux kernel legacy module being ported by me.
  The following errors appear:</p>
  
  <pre><code>&gt; sudo insmod camac-mx.ko
  insmod: error inserting 'camac-mx.ko': -1 Invalid module format
  dmesg |tail -n 1
  [1312783.938299] camac_mx: disagrees about version of symbol module_layout
  </code></pre>
  
  <p>How do I fix this?</p>