Alfred Perlstein b5d335ad6d Protect against an infinite loop when prefaulting pages. This can
happen when the vm system maps past the end of an object or tries
to map a zero length object, the pmap layer misses the fact that
offsets wrap into negative numbers and we get stuck.

Found by: Joost Pol aka Nohican <nohican@marcella.niets.org>
Submitted by: tegge
2000-11-07 18:31:16 +00:00
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