For the SMP case, flush the TLB at the beginning of the page zero/copy routines.  Otherwise we run into trouble with speculative tlb preloads on SMP systems.  This effectively defeats Jeff's revision 1.438 optimization (for his pentium4-M laptop) in the SMP case.  It breaks other systems, particularly athlon-MP's.
For the SMP case, flush the TLB at the beginning of the page zero/copy
routines.  Otherwise we run into trouble with speculative tlb preloads
on SMP systems.  This effectively defeats Jeff's revision 1.438
optimization (for his pentium4-M laptop) in the SMP case.  It breaks
other systems, particularly athlon-MP's.

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