From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Tim Sander" <tim.sander@hbm.com>
Subject: Re: [ANNOUNCE] 3.0.1-rt8 - Regression to 3.0-rt7
Date: Thu, 11 Aug 2011 17:28:29 +0200
Message-ID: <201108111728.29405.tim.sander@hbm.com>
References: <1312580681.28695.44.camel@twins> <201108111330.28168.tim.sander@hbm.com> <1313064142.7144.1.camel@twins>
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Cc: "linux-kernel" <linux-kernel@vger.kernel.org>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Paul E. McKenney" <paulmck@us.ibm.com>,
	"linux-rt-users" <linux-rt-users@vger.kernel.org>
To: "Peter Zijlstra" <peterz@infradead.org>
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Hi Peter
> 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 bus=
ted
> as well. But from what I can tell PREEMPT_BASE should be fine with su=
ch
> things disabling preemption..
>=20
> ---
> Index: linux-2.6/include/linux/uaccess.h
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- 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();
>  }
>=20
> -#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
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- 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;
>  }
>=20
> -#ifdef CONFIG_PREEMPT_RT_FULL
> +#ifdef CONFIG_PREEMPT_RT_BASE
>  void pagefault_disable(void)
>  {
>  	migrate_disable();
The patch fixes the problem for CONFIG_PREEMPT_RTB but not for=20
CONFIG_PREEMPT_LL. With the latter the error is still there.

Thanks
Tim

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