[PATCH v2 0/4] mtrr, mm, x86: Enhance MTRR checks for huge I/O mapping

[Toshi Kani <toshi.kani@hp.com>]

This patchset enhances MTRR checks for the kernel huge I/O mapping,
which was enabled by the patchset below:
  https://lkml.org/lkml/2015/3/3/589

The following functional changes are made in patch 4/4.
 - Allow pud_set_huge() and pmd_set_huge() to create a huge page
   mapping to a range covered by a single MTRR entry of any memory
   type.
 - Log a pr_warn() message when a specified PMD map range spans more
   than a single MTRR entry.  Drivers should make a mapping request
   aligned to a single MTRR entry when the range is covered by MTRRs.

Patch 1/4 addresses other review comments to the mapping funcs for
better code read-ability.  Patch 2/4 and 3/4 are bug fix and clean up
to mtrr_type_lookup().

The patchset is based on the -mm tree.
---
v2:
 - Update change logs and comments per review comments.
   (Ingo Molnar)
 - Add patch 3/4 to clean up mtrr_type_lookup(). (Ingo Molnar)

---
Toshi Kani (4):
 1/4 mm, x86: Document return values of mapping funcs
 2/4 mtrr, x86: Fix MTRR lookup to handle inclusive entry
 3/4 mtrr, x86: Clean up mtrr_type_lookup()
 4/4 mtrr, mm, x86: Enhance MTRR checks for KVA huge page mapping

---
 arch/x86/Kconfig                   |   2 +-
 arch/x86/include/asm/mtrr.h        |   5 +-
 arch/x86/kernel/cpu/mtrr/generic.c | 151 +++++++++++++++++++++----------------
 arch/x86/mm/pat.c                  |   4 +-
 arch/x86/mm/pgtable.c              |  53 +++++++++----
 5 files changed, 133 insertions(+), 82 deletions(-)

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