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

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Message-ID: <e2e108260804290616l489ac8c2udcb2e80fc268b72b@mail.gmail.com>
Date:	Tue, 29 Apr 2008 15:16:52 +0200
From:	"Bart Van Assche" <bart.vanassche@...il.com>
To:	ego@...ibm.com
Cc:	linux-kernel@...r.kernel.org,
	"Zdenek Kabelac" <zdenek.kabelac@...il.com>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"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 2:57 PM, Gautham R Shenoy <ego@...ibm.com> wrote:
> Subject: lockdep: fix recursive read lock validation
>  This means that the following sequence is now invalid, whereas previously
>  it was considered valid:
>
>   rlock(a); rlock(b); runlock(b); runlock(a)
>   rlock(b); rlock(a);

Why are you marking this sequence as invalid ? Although it can be
debated whether it is good programming practice to be inconsistent
about the order of read-locking, the above sequence can't be involved
in a deadlock.

Bart.
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