From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Andi Kleen <ak@suse.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: preempt bug in set_pmd_pfn?
Date: Tue, 04 Mar 2008 13:27:56 -0800 [thread overview]
Message-ID: <47CDBEDC.1050302@goop.org> (raw)
In-Reply-To: <20080304212821.GB8944@elte.hu>
Ingo Molnar wrote:
> * Jeremy Fitzhardinge <jeremy@goop.org> wrote:
>
>
>> I think set_pmd_pfn, which is only called by __set_fixmap, might have
>> a preempt bug in it.
>>
>
> yes, and we had similar preemption bugs in the past. I guess most places
> are either infrequent or have some natural atomicity anyway. Wanna send
> a patch?
>
Sure. Should it just disable preemption, or take a lock? It calls
set_pte_at without holding any pte locks; that seems to be relatively
common. Is it OK when you're operating on init_mm?
J
next prev parent reply other threads:[~2008-03-04 21:33 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-04 21:13 preempt bug in set_pmd_pfn? Jeremy Fitzhardinge
2008-03-04 21:28 ` Ingo Molnar
2008-03-04 21:27 ` Jeremy Fitzhardinge [this message]
2008-03-05 6:48 ` Ingo Molnar
2008-03-05 14:29 ` Hugh Dickins
2008-03-05 16:48 ` Jeremy Fitzhardinge
2008-03-05 17:38 ` Hugh Dickins
2008-03-05 19:18 ` Jeremy Fitzhardinge
2008-03-05 20:40 ` Hugh Dickins
2008-03-06 12:52 ` Ingo Molnar
2008-03-06 18:19 ` Jeremy Fitzhardinge
2008-03-05 16:45 ` Jeremy Fitzhardinge
2008-03-05 0:06 ` Andi Kleen
2008-03-05 0:07 ` Jeremy Fitzhardinge
2008-03-05 0:16 ` Andi Kleen
2008-03-05 0:19 ` Jeremy Fitzhardinge
2008-03-05 1:28 ` Andi Kleen
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