From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755446Ab1HKMCr (ORCPT ); Thu, 11 Aug 2011 08:02:47 -0400 Received: from merlin.infradead.org ([205.233.59.134]:60708 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751864Ab1HKMCq convert rfc822-to-8bit (ORCPT ); Thu, 11 Aug 2011 08:02:46 -0400 Subject: Re: [ANNOUNCE] 3.0.1-rt8 - Regression to 3.0-rt7 From: Peter Zijlstra To: Tim Sander Cc: linux-kernel , Thomas Gleixner , "Paul E. McKenney" , linux-rt-users Date: Thu, 11 Aug 2011 14:02:22 +0200 In-Reply-To: <201108111330.28168.tim.sander@hbm.com> References: <1312580681.28695.44.camel@twins> <201108091713.19292.tim.sander@hbm.com> <1313055790.23660.70.camel@twins> <201108111330.28168.tim.sander@hbm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT X-Mailer: Evolution 3.0.2- Message-ID: <1313064142.7144.1.camel@twins> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2011-08-11 at 13:30 +0200, Tim Sander wrote: > The error does not occur when configured with > CONFIG_PREEMPT_RT_FULL=y > but with > CONFIG_PREEMPT_RTB=y. > The same error also happens with > CONFIG_PREEMPT_LL=y. (A log is appended after the other log just > search for CONFIG_PREEMPT_LL > for starting point). Does the below (on top of -rt8) cure things for you? Shouldn't make a difference for PREEMPT_LL though, so maybe there's something else busted as well. But from what I can tell PREEMPT_BASE should be fine with such things disabling preemption.. --- Index: linux-2.6/include/linux/uaccess.h =================================================================== --- linux-2.6.orig/include/linux/uaccess.h +++ linux-2.6/include/linux/uaccess.h @@ -22,7 +22,7 @@ static inline void raw_pagefault_enable( preempt_check_resched(); } -#ifndef CONFIG_PREEMPT_RT_FULL +#ifndef CONFIG_PREEMPT_RT_BASE static inline void pagefault_disable(void) { raw_pagefault_disable(); Index: linux-2.6/mm/memory.c =================================================================== --- linux-2.6.orig/mm/memory.c +++ linux-2.6/mm/memory.c @@ -3438,7 +3438,7 @@ int handle_pte_fault(struct mm_struct *m return 0; } -#ifdef CONFIG_PREEMPT_RT_FULL +#ifdef CONFIG_PREEMPT_RT_BASE void pagefault_disable(void) { migrate_disable();