title: In what header is copy_from_user() declared?
body: <p>Can anyone please help me with getting the proper header files needed for the <code>copy_from_user</code> method? </p>
  
  <p>I found a few of the include headers I need, but my compiler keeps saying that they are not found. I am running CentOS on my machine. I have tried <code>yum</code> installing various kernel-headers and devel packages but still no luck.  </p>
  
  <p>Is there a special segment I need to add in my <code>gcc</code> command?  Everything I find on the Internet only tells me how to use the method but not actually how I can get access to it in the first place.</p>