linux-kernel - Re: [RFC PATCH 4/4] lockdep: fix race condition in __lock_set

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Message-ID: <1320669054.18053.25.camel@twins>
Date:	Mon, 07 Nov 2011 13:30:54 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	linux-kernel@...r.kernel.org, sergey.senozhatsky@...il.com,
	bp@...en8.de, Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC PATCH 4/4] lockdep: fix race condition in
 __lock_set_class()

On Fri, 2011-11-04 at 17:26 +0800, Yong Zhang wrote:
> When someone call lock_set_class() with valid key, nothing
> protect the initializing of 'lockdep_map'; thus could lead
> to flase positive warning from lockdep (such as "key not in
> .data!"). This patch cure that potential issue.

How? that warning is triggered of the lock_class_key * passed into
lockdep_init_map and is unrelated to the actual content of the
lockdep_map.


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