Change the implementation of swap backing to use the VM system in normal ways, and drop the need for vm_pager_strategy().
Change the implementation of swap backing to use the VM system in normal
ways, and drop the need for vm_pager_strategy().

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase