This patch applies to 2.6.17-rc6 to replace several occurrences of
TASK_UNMAPPED_BASE with current->mm->mmap_base, mm->mmap_base, or base,
as appropriate.

I am not entirely sure what all of the code I messed with is doing, to
be quite honest.  Code that seemed to be initializing a task and setting
up the mmap() base I left with TASK_UNMAPPED_BASE; code that seemed to
be trying to figure out what the mmap() base was I replaced with
mm->mmap_base.

Because of this, I may have made a couple errors.  Could I get some
comments on whether any of this is dirty and why?  I'll make appropriate
changes and re-submit.  This only took 2 hours anyway.

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