[PATCH 0/3] mtrr, mm, x86: Enhance MTRR checks for huge I/O mapping

From: Toshi Kani
Date: Tue Mar 10 2015 - 16:24:41 EST

This patchset enhances MTRR checks for the kernel huge I/O mapping,
which was enabled by the patchset below:

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
- 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(-)

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