linux-kernel - Re: [ANNOUNCE] 3.0.1-rt8

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Date:	Thu, 11 Aug 2011 14:02:22 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tim Sander <tim.sander@....com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ibm.com>,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: [ANNOUNCE] 3.0.1-rt8 - Regression to 3.0-rt7

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();

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