Using unused physical bits is something that will break eventually. Changelog since V1 o Reuse software-bits o Use paravirt ops when modifying PTEs in the NUMA helpers Aliasing _PAGE_NUMA and _PAGE_PROTNONE had some convenient properties but it ultimately gave Xen a headache and pisses almost everybody off that looks closely at it. Two discussions on "why this makes sense" is one discussion too many so rather than having a third so here is this series. This series reuses the PTE bits that are available to the programmer. This adds some contraints on how and when automatic NUMA balancing can be enabled but it should go away again when Xen stops using _PAGE_IOMAP. The series also converts the NUMA helpers to use paravirt-friendly operations but it needs a Tested-by from the Xen and powerpc people. arch/x86/Kconfig | 2 +- arch/x86/include/asm/pgtable.h | 5 +++ arch/x86/include/asm/pgtable_types.h | 66 ++++++++++++++++++++---------------- include/asm-generic/pgtable.h | 31 ++++++++++++----- mm/memory.c | 12 ------- 5 files changed, 66 insertions(+), 50 deletions(-) -- 1.8.4.5 -- 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>