From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754891AbZERKDg (ORCPT ); Mon, 18 May 2009 06:03:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753585AbZERKDW (ORCPT ); Mon, 18 May 2009 06:03:22 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:35375 "EHLO www.etchedpixels.co.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751991AbZERKDV (ORCPT ); Mon, 18 May 2009 06:03:21 -0400 Date: Mon, 18 May 2009 11:03:59 +0100 From: Alan Cox To: Jamie Lokier Cc: Andi Kleen , Vitaly Mayatskikh , Josef Bacik , sandeen@redhat.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() by check_readable_bytes() Message-ID: <20090518110359.0da1e6a7@lxorguk.ukuu.org.uk> In-Reply-To: <20090518094808.GA12041@shareable.org> References: <1242317939-15392-1-git-send-email-v.mayatskih@gmail.com> <1242317939-15392-3-git-send-email-v.mayatskih@gmail.com> <87k54iq2gv.fsf@basil.nowhere.org> <871vqqkdf0.wl%vmayatsk@redhat.com> <20090515093838.GB16682@one.firstfloor.org> <20090515134315.GB8235@shareable.org> <20090518093136.152a1bb7@lxorguk.ukuu.org.uk> <20090518094808.GA12041@shareable.org> X-Mailer: Claws Mail 3.7.0 (GTK+ 2.14.7; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On MMUless you wouldn't use page protection as a GC technique :-) > Is EFAULT really optional on systems with page protection? Yes. It's also not guaranteed under Linux although pretty much all our I/O paths do bother to report -EFAULT