Originally submitted by Clark Williams as part of a cleanup,
but happens also to fix an ia64 build problem:

arch/ia64/kernel/init_task.c:38: error: 'RR_TIMESLICE' undeclared here (not in a function)
Signed-off-by: NClark Williams <clark.williams@gmail.com>
Signed-off-by: NTony Luck <tony.luck@intel.com>