Its only normally invisible. Mark Hemment pointed out there is currently a
race where if both cpus go to fill in the same entry the logic goes
pgd present pgd present
pmd not present
The race looks right to me since both CPU's can be running from the same
The obvious fix (removing the 2nd check) of course hangs the WP check. I
have a hack [not for Linus grade] for that now but really need to walk as
far as the pte in the racey case to check for a WP fault.
> 2.4.x. In that case you would take the exception table lock, but that is
> true in both 2.2.x and in 2.4.x.
I didnt say it wasnt
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