From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-f198.google.com (mail-qt0-f198.google.com [209.85.216.198]) by kanga.kvack.org (Postfix) with ESMTP id 388E46B0033 for ; Tue, 7 Feb 2017 15:06:58 -0500 (EST) Received: by mail-qt0-f198.google.com with SMTP id h56so118568331qtc.1 for ; Tue, 07 Feb 2017 12:06:58 -0800 (PST) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id d31si3770852qkh.193.2017.02.07.12.06.57 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 07 Feb 2017 12:06:57 -0800 (PST) Date: Tue, 7 Feb 2017 21:06:54 +0100 From: Andrea Arcangeli Subject: Re: [PATCH] userfaultfd: mcopy_atomic: update cases returning -ENOENT Message-ID: <20170207200654.GK25530@redhat.com> References: <20170207150249.GA6709@rapoport-lnx> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170207150249.GA6709@rapoport-lnx> Sender: owner-linux-mm@kvack.org List-ID: To: Mike Rapoport Cc: Andrew Morton , "Dr. David Alan Gilbert" , Hillf Danton , Mike Kravetz , Pavel Emelyanov , Linux-MM , LKML On Tue, Feb 07, 2017 at 05:02:50PM +0200, Mike Rapoport wrote: > Hello Andrew, > > The patch below is an incremental fixup for concerns Andrea raised at [1]. > Please let me know if you prefer me to update the original patch and > resend. > > [1] http://www.spinics.net/lists/linux-mm/msg121267.html > > -- > Sincerely yours, > Mike. > > From 8acff65ecee8ca4cc892d35b45125c34568d1c93 Mon Sep 17 00:00:00 2001 > From: Mike Rapoport > Date: Tue, 7 Feb 2017 11:50:17 +0200 > Subject: [PATCH] userfaultfd: mcopy_atomic: update cases returning -ENOENT > > As Andrea commented in [1], if the VMA covering the address was unmapped, > we may end up with a VMA a way above the faulting address. In this case we > would like to return -ENOENT to allow uffd monitor detection of VMA > removal. > > [1] http://www.spinics.net/lists/linux-mm/msg121267.html > > Signed-off-by: Mike Rapoport Reviewed-by: Andrea Arcangeli -- 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 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932282AbdBGUG6 (ORCPT ); Tue, 7 Feb 2017 15:06:58 -0500 Received: from mx1.redhat.com ([209.132.183.28]:47230 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755100AbdBGUG4 (ORCPT ); Tue, 7 Feb 2017 15:06:56 -0500 Date: Tue, 7 Feb 2017 21:06:54 +0100 From: Andrea Arcangeli To: Mike Rapoport Cc: Andrew Morton , "Dr. David Alan Gilbert" , Hillf Danton , Mike Kravetz , Pavel Emelyanov , Linux-MM , LKML Subject: Re: [PATCH] userfaultfd: mcopy_atomic: update cases returning -ENOENT Message-ID: <20170207200654.GK25530@redhat.com> References: <20170207150249.GA6709@rapoport-lnx> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170207150249.GA6709@rapoport-lnx> User-Agent: Mutt/1.7.2 (2016-11-26) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Tue, 07 Feb 2017 20:06:57 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 07, 2017 at 05:02:50PM +0200, Mike Rapoport wrote: > Hello Andrew, > > The patch below is an incremental fixup for concerns Andrea raised at [1]. > Please let me know if you prefer me to update the original patch and > resend. > > [1] http://www.spinics.net/lists/linux-mm/msg121267.html > > -- > Sincerely yours, > Mike. > > From 8acff65ecee8ca4cc892d35b45125c34568d1c93 Mon Sep 17 00:00:00 2001 > From: Mike Rapoport > Date: Tue, 7 Feb 2017 11:50:17 +0200 > Subject: [PATCH] userfaultfd: mcopy_atomic: update cases returning -ENOENT > > As Andrea commented in [1], if the VMA covering the address was unmapped, > we may end up with a VMA a way above the faulting address. In this case we > would like to return -ENOENT to allow uffd monitor detection of VMA > removal. > > [1] http://www.spinics.net/lists/linux-mm/msg121267.html > > Signed-off-by: Mike Rapoport Reviewed-by: Andrea Arcangeli