Hi all,
when checking for some other stuff in arch/i386/entry.S, I stumbled
across some low-hanging fruits...
As they aren't that critical, I suppose, they are save for inclusion.

The first bit changes include/asm/processor.h to not specify the
spin_lock_prefetch if we're compiling for a UP system. This only applies
to processors with 3DNOW instructions, but anyway (same applies for
include/linux/prefetch.h).

Then, it additionally makes the prefetch instructions available to
Pentium4 systems.

The last piece in sched.c optimizes away the reading of
task_struct->processor in several scheduling functions for UP systems,
because this definitely will be 0.

Greetings,
raY