title: debugfs_create_file doesn't create file
body: <p>I am trying to create a debugfs file using the debugfs_create_file(...). I have written a sample code for this.</p>
  
  <pre><code>static int __init mmapexample_module_init(void)                                 
   {                                                                               
           file1 = debugfs_create_file("mmap_example", 0644, NULL, NULL, &amp;my_fops)\
   ;                                                                               
           printk(KERN_ALERT "Hello, World\n");                                    
           if(file1==NULL)                                                         
             {                                                                     
               printk(KERN_ALERT "Error occured\n");                               
             }                                                                     
           if(file1==-ENODEV)                                                      
             {                                                                     
               printk(KERN_ALERT "ENODEV occured\n");                              
             }                                                                     
           return 0;                                                               
   }  
  </code></pre>
  
  <p>When i ran insmod i could get the Hello, World message but no the error message. So i think the debugfs_create_file worked fine. However i couldn't find any file in /sys/kernel/debug. The folder is there but it is empty. Can anyone help me with this? Thank you...</p>
  
  <p>Thanks,
  Bala</p>