Should there be a check to ensure we don't return VM_FAULT_RACE when the
pte which was inserted is exactly the same one we would have inserted?
Could we generalize that more to the point of only returning VM_FAULT_RACE
when write access was requested but the racing pte was not writable?

Most of the test cases I have thrown at this have gotten the writer
faulting first which did not result in problems.  I would hate to slow
things down if not necessary.  I am unaware of more issues than the one
I have been tripping.

Thanks,
Robin Holt
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