From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754908AbZCQFHx (ORCPT ); Tue, 17 Mar 2009 01:07:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751312AbZCQFHn (ORCPT ); Tue, 17 Mar 2009 01:07:43 -0400 Received: from gw.goop.org ([64.81.55.164]:50855 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751134AbZCQFHn (ORCPT ); Tue, 17 Mar 2009 01:07:43 -0400 Message-ID: <49BF301C.6010708@goop.org> Date: Mon, 16 Mar 2009 22:07:40 -0700 From: Jeremy Fitzhardinge User-Agent: Thunderbird 2.0.0.19 (X11/20090105) MIME-Version: 1.0 To: "H. Peter Anvin" CC: Yinghai Lu , Ingo Molnar , Linux Kernel Mailing List Subject: Re: [crash] Re: Latest brk patchset References: <49BC413B.5020104@zytor.com> <49BC4CAC.202@goop.org> <49BC4DB6.9070403@zytor.com> <49BCA03D.3020605@goop.org> <20090315203802.GA14625@elte.hu> <49BD70EF.7010204@goop.org> <20090315212854.GA23960@elte.hu> <49BD8F15.4020301@goop.org> <20090316085402.GC1062@elte.hu> <49BE7A84.2030503@goop.org> <49BE84D6.3010006@kernel.org> <49BE9248.6050707@goop.org> <49BE97D5.4010002@zytor.com> <49BEA7BE.6050400@goop.org> <49BEAD27.3050801@kernel.org> <49BEAFEC.7020400@goop.org> <49BEB5FE.7050601@zytor.com> <49BEBD98.3090905@goop.org> <49BEC143.6030104@zytor.com> <49BEC53F.20200@goop.org> <49BED431.5070201@zytor.com> <49BF0A51.5000909@kernel.org> <49BF2054.9020009@zytor.com> In-Reply-To: <49BF2054.9020009@zytor.com> X-Enigmail-Version: 0.95.6 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org H. Peter Anvin wrote: > Yinghai Lu wrote: > >>> You could also write: >>> >>> PAGE_TABLE_SIZE((-PAGE_OFFSET & 0xffffffff) >> PAGE_SHIFT) << PAGE_SHIFT >>> >>> (the & 0xffffffff is necessary, or you'll get a signed shift.) >>> >> max kernel address space range? >> >> > > Yes, either ((1 << 32)-PAGE_OFFSET) or (-PAGE_OFFSET & 0xffffffff) > should work for that. > The former seems more obvious. J