title: What does __init mean in the Linux kernel code?
body: <p>In the Linux kernel source code I found this function:</p>
  
  <pre><code>static int __init clk_disable_unused(void) 
  {
     // some code
  }
  </code></pre>
  
  <p>Here I can not understand what does <code>__init</code> means.</p>