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Re: [PATCH] workaround minor lockdep bug triggered by mm_take_all_locks

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From: Arjan van de Ven <arjan@...>
To: Andrea Arcangeli <andrea@...>
Cc: Peter Zijlstra <a.p.zijlstra@...>, Dave Jones <davej@...>, Roland Dreier <rdreier@...>, Linus Torvalds <torvalds@...>, David Miller <davem@...>, <jeremy@...>, <hugh@...>, <mingo@...>, <akpm@...>, <linux-kernel@...>
Subject: Re: [PATCH] workaround minor lockdep bug triggered by mm_take_all_locks
Date: Monday, August 4, 2008 - 5:27 pm

On Mon, 4 Aug 2008 23:09:54 +0200
Andrea Arcangeli <andrea@qumranet.com> wrote:



I think you totally misunderstand things then.

Lockdep will report a problem if it *ever* sees a BA order after it has
seen a BA order. They don't have to happen at the same time. Or even
within hours of eachother.

They MIGHT happen... in a narrow time window, when you have a deadlock.
But lockdep will warn you about the order violation without actually
having to dealock... because the AB is likely to be done already most
of the time when the BA happens.
--
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Messages in current thread:
[RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 9:03 am)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Thu Aug 7, 7:25 am)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Jeremy Fitzhardinge, (Mon Aug 4, 2:06 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 2:54 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Jeremy Fitzhardinge, (Mon Aug 4, 3:26 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Linus Torvalds, (Mon Aug 4, 3:31 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Steven Rostedt, (Wed Oct 8, 11:27 am)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Nick Piggin, (Wed Oct 8, 11:52 am)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Steven Rostedt, (Wed Oct 8, 1:18 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Linus Torvalds, (Wed Oct 8, 11:43 am)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Steven Rostedt, (Wed Oct 8, 12:03 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Linus Torvalds, (Wed Oct 8, 12:19 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Steven Rostedt, (Wed Oct 8, 12:53 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Jeremy Fitzhardinge, (Mon Aug 4, 4:16 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 3:39 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Roland Dreier, (Mon Aug 4, 10:07 am)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 10:19 am)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Roland Dreier, (Mon Aug 4, 10:26 am)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 10:32 am)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Dave Jones, (Mon Aug 4, 10:53 am)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 10:56 am)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Andrea Arcangeli, (Mon Aug 4, 12:26 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 12:38 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), David Miller, (Mon Aug 4, 5:32 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Andrea Arcangeli, (Mon Aug 4, 1:27 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 2:48 pm)
Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Andrea Arcangeli, (Mon Aug 4, 1:46 pm)
[PATCH] workaround minor lockdep bug triggered by mm_take_al..., Andrea Arcangeli, (Mon Aug 4, 1:57 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Peter Zijlstra, (Mon Aug 4, 2:48 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 4:15 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Peter Zijlstra, (Mon Aug 4, 4:37 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 5:09 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Roland Dreier, (Mon Aug 4, 10:00 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 10:18 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Roland Dreier, (Tue Aug 5, 8:02 am)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Tue Aug 5, 8:20 am)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., David Miller, (Mon Aug 4, 5:57 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Arjan van de Ven, (Mon Aug 4, 5:27 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 5:54 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Pekka Enberg, (Mon Aug 4, 5:14 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 5:30 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Arjan van de Ven, (Mon Aug 4, 5:42 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 6:30 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Arjan van de Ven, (Mon Aug 4, 7:38 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 8:47 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrew Morton, (Mon Aug 4, 5:41 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 6:12 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Roland Dreier, (Mon Aug 4, 2:56 pm)
Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Peter Zijlstra, (Mon Aug 4, 3:05 pm)