This is the other part to shared page tables.  It will actively attempt to
find and share a pte page for newly mapped shared memory.

This patch is intended to be applied to 2.5.41-mm3 plus the bugfix patch I
submitted this morning.

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