linux-kernel - Re: lockdep: strange %s#5 lock name

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Message-ID: <20140213213253.GF27965@twins.programming.kicks-ass.net>
Date:	Thu, 13 Feb 2014 22:32:53 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Tommi Rantala <tt.rantala@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, trinity@...r.kernel.org
Subject: Re: lockdep: strange %s#5 lock name

On Thu, Feb 13, 2014 at 04:26:45PM -0500, Tejun Heo wrote:
> > It seems to me that when the second time alloc_workqueue() is called
> > from the same code path, it would have two locks with the same key, but
> > not the same &wq->name, which doesn't meet lockdep's assumption.
> 
> Dang...  I reverted the previous patch for now.  Peter, does this
> approach sound good to you?

Whatever works I suppose; like Li said; a little ugly but not sure we
can do better.
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