From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265057AbUEVCRw (ORCPT ); Fri, 21 May 2004 22:17:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265146AbUEVCO0 (ORCPT ); Fri, 21 May 2004 22:14:26 -0400 Received: from fw.osdl.org ([65.172.181.6]:5595 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S264992AbUEVCOD (ORCPT ); Fri, 21 May 2004 22:14:03 -0400 Date: Fri, 21 May 2004 19:13:26 -0700 From: Andrew Morton To: markh@compro.net Cc: linux-kernel@vger.kernel.org Subject: Re: mlockall and mmap of IO devices don't mix Message-Id: <20040521191326.58100086.akpm@osdl.org> In-Reply-To: <40ADE959.822F1C23@compro.net> References: <20031003214411.GA25802@rudolph.ccur.com> <40ADE959.822F1C23@compro.net> X-Mailer: Sylpheed version 0.9.7 (GTK+ 1.2.10; i386-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 X-Mailing-List: linux-kernel@vger.kernel.org Mark Hounschell wrote: > > Joe Korty wrote: > > > > 2.6.0-test6: the use of mlockall(2) in a process that has mmap(2)ed > > the registers of an IO device will hang that process uninterruptibly. > > The task runs in an infinite loop in get_user_pages(), invoking > > follow_page() forever. > > > > Using binary search I discovered that the problem was introduced > > in 2.5.14, specifically in ChangeSetKey > > > > zippel@linux-m68k.org|ChangeSet|20020503210330|37095 > > > > I know this is an old thread but can anyone tell me if this problem is > resolved in the current 2.6.6 kernel? > There's an utterly ancient patch in -mm which might fix this. http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.6/2.6.6-mm4/broken-out/get_user_pages-handle-VM_IO.patch