linux-kernel - Re: [PATCH 1/8] lockdep: fix recursive read lock validation

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Message-ID: <e2e108260804290929l3c7a6a07nddc18512abb9e6ed@mail.gmail.com>
Date:	Tue, 29 Apr 2008 18:29:01 +0200
From:	"Bart Van Assche" <bart.vanassche@...il.com>
To:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Cc:	ego@...ibm.com, linux-kernel@...r.kernel.org,
	"Zdenek Kabelac" <zdenek.kabelac@...il.com>,
	"Oleg Nesterov" <oleg@...sign.ru>,
	"Heiko Carstens" <heiko.carstens@...ibm.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Srivatsa Vaddagiri" <vatsa@...ibm.com>
Subject: Re: [PATCH 1/8] lockdep: fix recursive read lock validation

On Tue, Apr 29, 2008 at 6:15 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
>
>  > Or: whether or not to allow a sequence like "rlock(a); rlock(b);
>  > runlock(b); runlock(a); rlock(b); rlock(a);" is something we can
>  > choose. We do not have to forbid this sequence -- we can choose
>  > whether or not we allow this sequence.
>
>  I'm utterly confused now; I never argued that it would get deadlocks;
>  and I said I choose to not allow it from a lockdep pov. What else do you
>  want?

So we both agree that the statement in the original e-mail (by Gautham
R Shenoy) is wrong ? The original e-mail stated that obtaining reader
locks in an inconsistent order is wrong.

Bart.
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