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(-) -- 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>