setup - setup devices and file systems, mount root file sys-
setup is called once from within linux/init/main.c. It
calls initialization functions for devices and file systems
configured into the kernel and then mounts the root file
No user process may call setup. Any user process, even a
process with super-user permission, will receive EPERM.
setup always returns -1 for a user process.
Always, for a user process.
This function is Linux specific, and should not be used in
programs intended to be portable.