title: Why some kernel config didn't show in .config
body: <p>I search .config, there is no</p>
  
  <pre><code>CONFIG_ACPI_NUMA
  </code></pre>
  
  <p>but I can see it when doing menuconfig.</p>
  
  <p>Another question, I can see this in .config</p>
  
  <pre><code># CONFIG_NUMA is not set
  </code></pre>
  
  <p>Why CONFIG_ACPI_NUMA didn't show in .config as</p>
  
  <pre><code># CONFIG_ACPI_NUMA is not set  ( There is no this line in .config )
  </code></pre>