VOID
TdiMapBuffer(
  IN  PMDL MdlChain
  );

Routine Description:

    This routine ensures that the MappedSystemVa field of every MDL in an
    MDL chain is valid; calling MmMapLockedPages where necessary.

    !!! This routine no longer does anything, and should be removed!

Arguments:

    MdlChain - Pointer to a chain of MDLs describing the data to be mapped.

Return Value:

    none.