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/2014/8/26/61 All new/modified interfaces have been tested. --- Toshi Kani (5): 1/5 x86, mm, pat: Set WT to PA4 slot of PAT MSR 2/5 x86, mm, pat: Change reserve_memtype() to handle WT 3/5 x86, mm, asm-gen: Add ioremap_wt() for WT 4/5 x86, mm: Add set_memory_wt() for WT 5/5 x86, mm, pat: Add pgprot_writethrough() for WT --- 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 | 73 +++++++++++++++++++++++++++--------- include/asm-generic/io.h | 4 ++ include/asm-generic/iomap.h | 4 ++ include/asm-generic/pgtable.h | 4 ++ 9 files changed, 172 insertions(+), 25 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>