linux-kernel - Re: unpinning an unpinned lock

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Message-ID: <55FC1339.0@oracle.com>
Date:	Fri, 18 Sep 2015 09:35:53 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
CC:	Tim Spriggs <tspriggs@...le.com>, davej@...emonkey.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: unpinning an unpinned lock

On 09/16/2015 10:10 AM, Peter Zijlstra wrote:
> On Wed, Sep 16, 2015 at 12:55:35PM +0200, Peter Zijlstra wrote:
> 
>> > In any case, I'll have another go at tackling this, otherwise I'll have
>> > to disable this warning for now.
>> > 
>> > Note that this lockdep 'feature' is pure annotation, no actual logic was
>> > changed.
> Sasha, can you give this a spin?
> 
> So there's 2 places where we take a lock out of the middle of a stack,
> and in those cases it would fail to preserve the pin_count.

The patch fixes the issue for me:

	Tested-by: Sasha Levin <sasha.levin@...cle.com>


Thanks,
Sasha
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