Patch from: Zwane Mwaikambo <zwane@holomorphy.com>

Considering that smp_call_function isn't allowed to hold a lock reference and
within smp_call_function we lock and unlock call_lock thus triggering a
preempt point.  Therefore we can't guarantee that we'll be on the same
processor when we hit do_flush_tlb_all_local.

void flush_tlb_all(void)
{
	smp_call_function (flush_tlb_all_ipi,0,1,1);

	do_flush_tlb_all_local();
}

...

smp_call_function()
{
	spin_lock(call_lock);
	...
	spin_unlock(call_lock);
	<preemption point>
}

...

do_flush_tlb_all_local() - possibly not executing on same processor
anymore.