From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yh0-f43.google.com (mail-yh0-f43.google.com [209.85.213.43]) by kanga.kvack.org (Postfix) with ESMTP id EDD736B0035 for ; Tue, 10 Dec 2013 19:35:01 -0500 (EST) Received: by mail-yh0-f43.google.com with SMTP id a41so4521815yho.16 for ; Tue, 10 Dec 2013 16:35:01 -0800 (PST) Received: from mail-ie0-x22f.google.com (mail-ie0-x22f.google.com [2607:f8b0:4001:c03::22f]) by mx.google.com with ESMTPS id j69si15555064yhb.171.2013.12.10.16.35.00 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 10 Dec 2013 16:35:01 -0800 (PST) Received: by mail-ie0-f175.google.com with SMTP id x13so9913285ief.20 for ; Tue, 10 Dec 2013 16:35:00 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <52A79B0D.4090303@zytor.com> References: <52A6D9B0.7040506@huawei.com> <52A787D0.2070400@zytor.com> <52A79B0D.4090303@zytor.com> Date: Tue, 10 Dec 2013 16:35:00 -0800 Message-ID: Subject: Re: [PATCH] mm,x86: fix span coverage in e820_all_mapped() From: Yinghai Lu Content-Type: text/plain; charset=ISO-8859-1 Sender: owner-linux-mm@kvack.org List-ID: To: "H. Peter Anvin" Cc: Xishi Qiu , Thomas Gleixner , Ingo Molnar , the arch/x86 maintainers , Linn Crosetto , Pekka Enberg , LKML , Andrew Morton , Linux MM 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. -- 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