From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f44.google.com (mail-oi0-f44.google.com [209.85.218.44]) by kanga.kvack.org (Postfix) with ESMTP id 432276B0092 for ; Tue, 10 Mar 2015 16:24:06 -0400 (EDT) Received: by oifu20 with SMTP id u20so3882581oif.11 for ; Tue, 10 Mar 2015 13:24:06 -0700 (PDT) Received: from g9t5009.houston.hp.com (g9t5009.houston.hp.com. [15.240.92.67]) by mx.google.com with ESMTPS id y3si917768oer.66.2015.03.10.13.24.05 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 10 Mar 2015 13:24:05 -0700 (PDT) From: Toshi Kani 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> Sender: owner-linux-mm@kvack.org List-ID: 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 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(-) -- 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