linux-kernel - Re: tty, vt: lockdep warnings

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Message-ID: <alpine.LNX.2.00.1211051231070.21645@eggly.anvils>
Date:	Mon, 5 Nov 2012 12:34:44 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Sasha Levin <sasha.levin@...cle.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Sasha Levin <levinsasha928@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	Dave Jones <davej@...hat.com>, linux-fbdev@...r.kernel.org,
	florianSchandinat@....de
Subject: Re: tty, vt: lockdep warnings

On Mon, 5 Nov 2012, Alan Cox wrote:
> > The fbdev potential for deadlock may be years old, but the warning
> > (and consequent disabling of lockdep from that point on - making it
> > useless to everybody else in need of it) is new, and comes from the
> > commit below in linux-next.
> > 
> > I revert it in my own testing: if there is no quick fix to the
> > fbdev issue on the way, Daniel, please revert it from your tree.
> 
> If you revert it you swap it for a different deadlock - and one that
> happens more often I would expect. Not very useful.

But a deadlock we have lived with for years.  Without reverting,
we're prevented from discovering all the new deadlocks we're adding.

> 
> I'm hoping the framebuffer maintainer will bother to respond to this
> because that's the only way it can be sorted out.

That would be ideal - thanks.

Hugh
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