[PATCH 0/3] 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 3/3.
 - 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 requested 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 1/3 addresses other review comments to the mapping funcs for
better code read-ability.  Patch 2/3 fixes a bug in mtrr_type_lookup().

The patchset is based on the -mm tree.
---
Toshi Kani (3):
 1/3 mm, x86: Document return values of mapping funcs
 2/3 mtrr, x86: Fix MTRR lookup to handle inclusive entry
 3/3 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 | 52 +++++++++++++++++++++++++------------
 arch/x86/mm/pat.c                  |  4 +--
 arch/x86/mm/pgtable.c              | 53 ++++++++++++++++++++++++++++----------
 5 files changed, 81 insertions(+), 35 deletions(-)