Fix small race in 44x tlbie function

[Benjamin Herrenschmidt]

On Thu, 2007-08-09 at 01:35 -0500, Kumar Gala wrote:
> >>>> Did you actually see this happen?
> >>>
> >>> Yes.
> >>
> >> When?
> >>
> >> We don't have critical wired to anything, I don't expect watchdog to
> >> cause another fault.. so just wondering.
> >
> > On debug (trace) interrupts on blue gene.
> 
> Do you know why the debug code caused a fault?

Sure, it may access vmalloc space for example, which can cause a TLB
miss...

Ben.