4.0-2.12 changelog: 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.