From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yh0-f51.google.com (mail-yh0-f51.google.com [209.85.213.51]) by kanga.kvack.org (Postfix) with ESMTP id 35C8F6B0070 for ; Tue, 10 Dec 2013 20:07:11 -0500 (EST) Received: by mail-yh0-f51.google.com with SMTP id c41so4526209yho.38 for ; Tue, 10 Dec 2013 17:07:11 -0800 (PST) Received: from mail.zytor.com (terminus.zytor.com. [2001:1868:205::10]) by mx.google.com with ESMTPS id v1si15666227yhg.76.2013.12.10.17.07.09 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 10 Dec 2013 17:07:10 -0800 (PST) In-Reply-To: References: <52A6D9B0.7040506@huawei.com> <52A787D0.2070400@zytor.com> <52A79B0D.4090303@zytor.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: Re: [PATCH] mm,x86: fix span coverage in e820_all_mapped() From: "H. Peter Anvin" Date: Tue, 10 Dec 2013 17:06:36 -0800 Message-ID: Sender: owner-linux-mm@kvack.org List-ID: To: Yinghai Lu Cc: Xishi Qiu , Thomas Gleixner , Ingo Molnar , the arch/x86 maintainers , Linn Crosetto , Pekka Enberg , LKML , Andrew Morton , Linux MM Ok, the issue I thought we were discussing was actually [A,B) [B,C) [C,D) ... Yinghai Lu wrote: >On Tue, Dec 10, 2013 at 2:51 PM, H. Peter Anvin wrote: >> On 12/10/2013 01:52 PM, Yinghai Lu wrote: >>>> >>>> What happens if it spans more than two regions? >>> >>> [A, B), [B+1, C), [C+1, D) ? >>> start in [A, B), and end in [C+1, D). >>> >>> old code: >>> first with [A, B), start set to B. >>> then with [B+1, C), start still keep as B. >>> then with [C+1, D), start still keep as B. >>> at last still return 0...aka not_all_mapped. >>> >>> old code is still right. >>> >> >> Why not_all_mapped? > >[B, B+1), and [C, C+1) are not there. -- Sent from my mobile phone. Please pardon brevity and lack of formatting. -- 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