From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f178.google.com (mail-wi0-f178.google.com [209.85.212.178]) by kanga.kvack.org (Postfix) with ESMTP id 304159003C7 for ; Tue, 21 Jul 2015 04:05:52 -0400 (EDT) Received: by wibxm9 with SMTP id xm9so112637004wib.0 for ; Tue, 21 Jul 2015 01:05:51 -0700 (PDT) Received: from mail-wg0-x230.google.com (mail-wg0-x230.google.com. [2a00:1450:400c:c00::230]) by mx.google.com with ESMTPS id cb5si17721259wib.5.2015.07.21.01.05.49 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 21 Jul 2015 01:05:50 -0700 (PDT) Received: by wgbcc4 with SMTP id cc4so56089309wgb.3 for ; Tue, 21 Jul 2015 01:05:49 -0700 (PDT) Date: Tue, 21 Jul 2015 10:05:44 +0200 From: Ingo Molnar Subject: Re: [PATCH v2 0/4] x86, mm: Handle large PAT bit in pud/pmd interfaces Message-ID: <20150721080544.GA28118@gmail.com> References: <1436977435-31826-1-git-send-email-toshi.kani@hp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1436977435-31826-1-git-send-email-toshi.kani@hp.com> Sender: owner-linux-mm@kvack.org List-ID: To: Toshi Kani Cc: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, 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 * Toshi Kani wrote: > 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 pfn and flags for all cases. > > Patch 1/4-2/4 make changes necessary for patch 3/4 to use P?D_PAGE_MASK. > > Patch 3/4 fixes pud/pmd interfaces to handle the PAT bit when PUD and PMD > mappings are used. > > Patch 3/4 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. Are patches 1-3 only needed to fix /sys/kernel/debug/kernel_page_tables output, or are there other things fixed as well? The patches do not tell us any of that information ... Thanks, Ingo -- 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