>That could be said for any change to the system's behaviour.  For instance,
>the change to top-down allocation of mmap'ed space might break a
>particularly silly application, but that didn't mean that we needed to
>version the ABI for it.  Versioning the ABI is only sensible when an
>application compiled before a change would break after it, but would work if
>recompiled after the change.

otoh, the change to top-down allocation of mmap'ed space only affects
the address you get back from mmap.  none of the api was changed.  :)

that said, i can certainly conceive of an application that says "i'll
mmap() this, and then i'll mmap() that directly after it by adding the
size of that and using MAP_FIXED".

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