This series fixes a hard-to-debug early boot hang on 32-bit NUMA systems. It adds coverage to the debugging code, adds some helpers, and eventually fixes the original bug I was hitting. [v3] * Remove unnecessary initializations in slow_virt_to_phys(), and convert 'level' to use the new enum pg_level. * Add some text to slow_virt_to_phys() to make it clear that we are not using it in any remotely fast paths. [v2] * Moved DEBUG_VIRTUAL patch earlier in the series (it has no dependencies on anything else and stands on its own. * Created page_level_*() helpers to replace a nasty switch() at hpa's suggestion -- 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>