From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yk0-f176.google.com (mail-yk0-f176.google.com [209.85.160.176]) by kanga.kvack.org (Postfix) with ESMTP id 58FD06B0038 for ; Thu, 9 Jul 2015 13:04:52 -0400 (EDT) Received: by ykeo3 with SMTP id o3so121036643yke.0 for ; Thu, 09 Jul 2015 10:04:52 -0700 (PDT) Received: from g4t3427.houston.hp.com (g4t3427.houston.hp.com. [15.201.208.55]) by mx.google.com with ESMTPS id y184si3883262yky.22.2015.07.09.10.04.50 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 09 Jul 2015 10:04:50 -0700 (PDT) From: Toshi Kani Subject: [PATCH 0/2] x86, mm: Fix PAT bit handling of large pages Date: Thu, 9 Jul 2015 11:03:49 -0600 Message-Id: <1436461431-27305-1-git-send-email-toshi.kani@hp.com> Sender: owner-linux-mm@kvack.org List-ID: To: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com Cc: akpm@linux-foundation.org, bp@alien8.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, jgross@suse.com, konrad.wilk@oracle.com, elliott@hp.com The PAT bit gets relocated to bit 12 when PUD and PMD mappings are used. This bit 12, however, is not covered by PTE_FLAGS_MASK, which is corrently used for masking the flag bits for all cases. Patch 1/2 fixes pud_flags() and pmd_flags() to handle the PAT bit when PUD and PMD mappings are used. Patch 2/2 fixes /sys/kernel/debug/kernel_page_tables to show the PAT bit properly. Note, the PAT bit is first enabled in 4.2-rc1 with WT mappings. --- Toshi Kani (2): 1/2 x86: Fix pXd_flags() to handle _PAGE_PAT_LARGE 2/2 x86, mm: Fix page table dump to show PAT bit --- arch/x86/include/asm/pgtable_types.h | 16 ++++++++++++--- arch/x86/mm/dump_pagetables.c | 39 +++++++++++++++++++----------------- 2 files changed, 34 insertions(+), 21 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