Hi Dan, based on the issues with the physiscal address S/G lists I suspect we will need this page hotplugging code. Any chance we could side step the issue of storing the page structs on the actual pmem for the first round so that we can an initial version into 4.3? I'll help with the max_pfn audit and testing with my WIP block driver that does I/O from pmem. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>