From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264870AbUEYO1b (ORCPT ); Tue, 25 May 2004 10:27:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264873AbUEYO1b (ORCPT ); Tue, 25 May 2004 10:27:31 -0400 Received: from mail.ccur.com ([208.248.32.212]:52491 "EHLO exchange.ccur.com") by vger.kernel.org with ESMTP id S264870AbUEYO13 (ORCPT ); Tue, 25 May 2004 10:27:29 -0400 Date: Tue, 25 May 2004 10:27:28 -0400 From: Joe Korty To: Andrew Morton Cc: markh@compro.net, linux-kernel@vger.kernel.org Subject: Re: mlockall and mmap of IO devices don't mix Message-ID: <20040525142728.GA10738@tsunami.ccur.com> Reply-To: joe.korty@ccur.com References: <20031003214411.GA25802@rudolph.ccur.com> <40ADE959.822F1C23@compro.net> <20040521191326.58100086.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040521191326.58100086.akpm@osdl.org> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, May 21, 2004 at 07:13:26PM -0700, Andrew Morton wrote: > 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 [ 2nd send -- corporate email system in the throes of being scrambled / updated ] Andrew, I have been using this patch for ages. Any chance of it being forwared to the official tree? Regards, Joe