This patchset adds support of Write-Through (WT) mapping on x86. The study below shows that using WT mapping may be useful for non-volatile memory. http://www.hpl.hp.com/techreports/2012/HPL-2012-236.pdf This patchset applies on top of the Juergen's patchset below, which provides the basis of the PAT management. https://lkml.org/lkml/2014/9/8/55 All new/modified interfaces have been tested. v2: - Changed WT to use slot 7 of the PAT MSR. (H. Peter Anvin, Andy Lutomirski) - Changed to have conservative checks to exclude all Pentium 2, 3, M, and 4 families. (Ingo Molnar, Henrique de Moraes Holschuh, Andy Lutomirski) - Updated documentation to cover WT interfaces and usages. (Andy Lutomirski, Yigal Korman) --- Toshi Kani (6): 1/6 x86, mm, pat: Set WT to PA4 slot of PAT MSR 2/6 x86, mm, pat: Change reserve_memtype() to handle WT 3/6 x86, mm, asm-gen: Add ioremap_wt() for WT 4/6 x86, mm: Add set_memory_wt() for WT 5/6 x86, mm, pat: Add pgprot_writethrough() for WT 6/6 x86, pat: Update documentation for WT changes --- Documentation/x86/pat.txt | 14 +++++-- arch/x86/include/asm/cacheflush.h | 10 ++++- arch/x86/include/asm/io.h | 2 + arch/x86/include/asm/pgtable_types.h | 3 ++ arch/x86/mm/ioremap.c | 24 ++++++++++++ arch/x86/mm/pageattr.c | 73 +++++++++++++++++++++++++++++++++--- arch/x86/mm/pat.c | 69 +++++++++++++++++++++++++--------- include/asm-generic/io.h | 4 ++ include/asm-generic/iomap.h | 4 ++ include/asm-generic/pgtable.h | 4 ++ 10 files changed, 179 insertions(+), 28 deletions(-) -- 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>