From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263341AbTHWVxA (ORCPT ); Sat, 23 Aug 2003 17:53:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263497AbTHWVw7 (ORCPT ); Sat, 23 Aug 2003 17:52:59 -0400 Received: from pizda.ninka.net ([216.101.162.242]:53179 "EHLO pizda.ninka.net") by vger.kernel.org with ESMTP id S263341AbTHWVwS (ORCPT ); Sat, 23 Aug 2003 17:52:18 -0400 Date: Sat, 23 Aug 2003 14:44:36 -0700 From: "David S. Miller" To: Hugh Dickins Cc: James.Bottomley@SteelEye.com, willy@debian.org, linux-kernel@vger.kernel.org, parisc-linux@lists.parisc-linux.org, drepper@redhat.com Subject: Re: [parisc-linux] Re: Problems with kernel mmap (failing tst-mmap-eofsync in glibc on parisc) Message-Id: <20030823144436.63cf118f.davem@redhat.com> In-Reply-To: References: <1061600974.2090.809.camel@mulgrave> X-Mailer: Sylpheed version 0.9.2 (GTK+ 1.2.6; sparc-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 23 Aug 2003 08:22:19 +0100 (BST) Hugh Dickins wrote: > On 22 Aug 2003, James Bottomley wrote: > > > > I suppose if we had a way of telling if any of the i_mmap list members > > were really MAP_SHARED semantics mappings, then we could alter our > > flush_dcache_page() implementation to work. > > Good idea. It's VM_MAYSHARE you need to check for. Nope, please see my other email for why all of these ideas simply will not work. If the first fault-in of a MAP_PRIVATE page is a read, it's just like a MAP_SHARED read-only page until the first write occurs.