From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753174AbbCJUYJ (ORCPT ); Tue, 10 Mar 2015 16:24:09 -0400 Received: from g9t5009.houston.hp.com ([15.240.92.67]:43356 "EHLO g9t5009.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751942AbbCJUYG (ORCPT ); Tue, 10 Mar 2015 16:24:06 -0400 From: Toshi Kani To: akpm@linux-foundation.org, hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, arnd@arndb.de Cc: linux-mm@kvack.org, x86@kernel.org, linux-kernel@vger.kernel.org, dave.hansen@intel.com, Elliott@hp.com, pebolle@tiscali.nl Subject: [PATCH 0/3] mtrr, mm, x86: Enhance MTRR checks for huge I/O mapping Date: Tue, 10 Mar 2015 14:23:14 -0600 Message-Id: <1426018997-12936-1-git-send-email-toshi.kani@hp.com> X-Mailer: git-send-email 1.9.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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(-)