linux-kernel - Re: [PATCH 24/25] r/o bind mounts: track number of mount writers

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Date:	Mon, 24 Sep 2007 15:06:42 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, hch@...radead.org
Subject: Re: [PATCH 24/25] r/o bind mounts: track number of mount writers

On Sun, 2007-09-23 at 23:17 -0700, Andrew Morton wrote:
> It look like a false positive to me, but really, for a patchset of this
> complexity and maturity I cannot fathom how it could have escaped any
> lockdep testing.

I test with lockdep all the time.  The problem was that lockdep doesn't
complain until you have 8 nested locks, and I only tested on a 4-cpu
system.

I lowered the lockdep nesting limit to 3, and got the warning on my
machine.

-- Dave

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