From: Arnd Bergmann <arnd@arndb.de>

sys32_nfsservctl is the largest remaining syscall emulation handler that can
be consolidated.  mips and ia64 currently don't use this at all, parisc has a
simpler implementation than the one used by s390, sparc ppc and that the new
compat_sys_nfsservctl is based on.

The user access checks in the code are inconsistant at least, which should be
fixed here.

Compile tested only due to lack of proper test setup.