After more careful consideration, I don't see any reasons why
page_table_lock is necessary for dealing with vmas.  I found one spot in
swapoff, but it was easily changed to mmap_sem.  I've beat on this code and
mjb has beat on this code with no problems.  Here's the patch to remove it.

Feel free to poke holes in it.

Dave McCracken

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Dave McCracken          IBM Linux Base Kernel Team      1-512-838-3059
dmccr@us.ibm.com                                        T/L   678-3059