Update to diskdump page_desc struct, required for ongoing support
    of the diskdump facility's compression feature, currently under
    development.
    Applied patch from Ken'ichi Ohmichi of NEC to prevent a segmentation
    violation during a "bt -f" on an x86_64 task that had taken a NMI
    during cpu_idle().
    Adapted Badari Pulavarty's patch for recognition of recent 2.6.14
    kernel structure/member name changes: mm_struct._rss to _file_rss,
    and the kmem_cache_s structure's renaming to kmem_cache.  Without
    the patch, crash sessions would fail during initialization with an
    "crash: invalid structure member offset: kmem_cache_s_num" error,
    and the "ps" command would fail with a "ps: invalid structure member
    offset: mm_struct_rss" error.