From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264537AbUEVKrj (ORCPT ); Sat, 22 May 2004 06:47:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264957AbUEVKrj (ORCPT ); Sat, 22 May 2004 06:47:39 -0400 Received: from 216-54-166-5.gen.twtelecom.net ([216.54.166.5]:35977 "EHLO texas.encore.com") by vger.kernel.org with ESMTP id S264537AbUEVKrh (ORCPT ); Sat, 22 May 2004 06:47:37 -0400 Message-ID: <40AF2FC4.911DB14B@compro.net> Date: Sat, 22 May 2004 06:47:32 -0400 From: Mark Hounschell Reply-To: markh@compro.net X-Mailer: Mozilla 4.8 [en] (X11; U; Linux 2.4.20-ert i686) X-Accept-Language: en MIME-Version: 1.0 To: Andrew Morton Cc: linux-kernel@vger.kernel.org Subject: Re: mlockall and mmap of IO devices don't mix References: <20031003214411.GA25802@rudolph.ccur.com> <40ADE959.822F1C23@compro.net> <20040521191326.58100086.akpm@osdl.org> 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 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 Thanks for that. I'll try it. Mark