linux-kernel - Re: [PATCH] lockdep: make print_lock_name() robust against non-existing lock

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Message-ID: <20150416153503.GC12676@worktop.ger.corp.intel.com>
Date:	Thu, 16 Apr 2015 17:35:03 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Andreas Messerschmid <andreas@...utronix.de>
Subject: Re: [PATCH] lockdep: make print_lock_name() robust against
 non-existing lock_class

On Thu, Apr 16, 2015 at 04:50:21PM +0200, Sebastian Andrzej Siewior wrote:

> Andreas confirmed that it works for him on v3.18 with minor adjustment.
> 
> <---
> +       struct held_lock lock = READ_ONCE(*hlock);
> +       unsigned int class_idx = lock.class_idx;
> --->
> 

I'm confused by the need for that. What was the failure with the
proposed patch?
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