From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f179.google.com (mail-ob0-f179.google.com [209.85.214.179]) by kanga.kvack.org (Postfix) with ESMTP id 726FD829A3 for ; Thu, 12 Mar 2015 13:19:01 -0400 (EDT) Received: by obbnt9 with SMTP id nt9so15375863obb.9 for ; Thu, 12 Mar 2015 10:19:01 -0700 (PDT) Received: from g9t5009.houston.hp.com (g9t5009.houston.hp.com. [15.240.92.67]) by mx.google.com with ESMTPS id n145si4195766oig.14.2015.03.12.10.18.59 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 12 Mar 2015 10:19:00 -0700 (PDT) From: Toshi Kani Subject: [PATCH v2 0/4] mtrr, mm, x86: Enhance MTRR checks for huge I/O mapping Date: Thu, 12 Mar 2015 11:18:06 -0600 Message-Id: <1426180690-24234-1-git-send-email-toshi.kani@hp.com> Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org, hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com Cc: linux-mm@kvack.org, x86@kernel.org, linux-kernel@vger.kernel.org, dave.hansen@intel.com, Elliott@hp.com, pebolle@tiscali.nl 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@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org