Once you have the kernel built you can make changes to any of the source files you want.
Then just use "make" and the install directives (for aufs, I think you an go to "make modules_install"), but that depends on whether you configured aufs to be a module.
the advantage of the "module" approach is that you don't have to reboot to use it. dismount the aufs mounted filesystem, unload the aufs module and reload it after the "make modules_install" ... This will update the module allowing the new one to be used without a reboot.
Last edited by jpollard; 02-18-2014 at 08:45 AM.