2.5.40+ futex broken with COW

From: Peter Wächtler (pwaechtler@mac.com)
Date: Tue Oct 08 2002 - 17:13:46 EST

The COW changes break PROCESS_SHARED futexes in
mmap( MAP_SHARED ).

I think that COW is unconditionally used on fork().
But you need to check for MAP_SHARED, eh?

If wanted I can provide a testcase (that runs fine on
2.4.19+futex patch + NGPT and on Irix)
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