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Subject[PATCH v2 0/6] Support Write-Through mapping on x86
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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(-)


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