linux-kernel - Re: [2.6.28.7] BUG: using smp_processor_id() in preemptible [00000000] code: pageattr-test/207

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Date:	Tue, 24 Feb 2009 22:22:41 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Tilman Schmidt <t.schmidt@...enixsoftware.de>,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	Jeremy Fitzhardinge <jeremy@...source.com>
Subject: Re: [2.6.28.7] BUG: using smp_processor_id() in preemptible
	[00000000] code: pageattr-test/207


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Tue, 24 Feb 2009 09:30:28 +0100 Ingo Molnar <mingo@...e.hu> wrote:
> 
> > 
> > * Tilman Schmidt <t.schmidt@...enixsoftware.de> wrote:
> > 
> > > On Mon, 23 Feb 2009 15:13:31 -0800, Andrew Morton <akpm@...ux-foundation.org> wrote:
> > > > A 2.6.28.6 -> 2.6.28.7 regressionlet.
> > > > 
> > > > This, I bet:
> > > > 
> > > > commit 2cf155b300c4839a7238b825c7c5f417e9d7cc68
> > > > Author: Jeremy Fitzhardinge <jeremy@...p.org>
> > > > Date:   Wed Feb 11 09:32:19 2009 -0800
> > > > 
> > > >     x86/cpa: make sure cpa is safe to call in lazy mmu mode
> > > >     
> > > >     commit 4f06b0436b2ddbd3b67b10e77098a6862787b3eb upstream.
> > > 
> > > Jackpot! Reverted that commit on 2.6.28.7, and the BUG messages are gone.
> > 
> > should be fixed by this as well:
> > 
> > d85cf93: x86/paravirt: make arch_flush_lazy_mmu/cpu disable preemption
> > 
> 
> Yup, that patch got lost.
> 
> commit d85cf93da66977dbc645352be1b2084a659d8a0b
> Author: Jeremy Fitzhardinge <jeremy@...p.org>
> Date:   Thu Feb 12 10:02:56 2009 -0800
> 
>     x86/paravirt: make arch_flush_lazy_mmu/cpu disable preemption
> 
> from Linus mainline is needed in 2.6.28.8, please.

agreed.

	Ingo
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