linux-kernel - Re: [RFC] Lockdep VS rw-semaphores strangeness

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Message-ID: <4616537D.20702@linux.intel.com>
Date:	Fri, 06 Apr 2007 07:04:45 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Pavel Emelianov <xemul@...ru>
CC:	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] Lockdep VS rw-semaphores strangeness

Pavel Emelianov wrote:
> I've already caught a fake warning when trying to write-lock
> an mm->mmap_sem with another mm's mmap_sem write-locked. With the
> patch attached everything works, fine.
> 
btw why is that a fake warning? what is your guarantee that you never 
ever do it in the opposite direction from the other thread as well?
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