title: add another field to user_struct
body: <p>I want to add new field ( to store number of ready process of this user ) to user_struct in file linux-source/kernel/user.c</p>
  
  <pre><code>struct user_struct {
      atomic_t ready_processes; /* I add this field */
      /* not important fields */
  }
  </code></pre>
  
  <p>where to initialize this field correctly ?</p>