linux-kernel - Re: [PATCH 1/4] lockdep: lock_set

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Message-ID: <1320741980.2244.4.camel@twins>
Date:	Tue, 08 Nov 2011 09:46:20 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	Vegard Nossum <vegard.nossum@...il.com>,
	linux-kernel@...r.kernel.org, sergey.senozhatsky@...il.com,
	bp@...en8.de, Ingo Molnar <mingo@...e.hu>,
	Tejun Heo <tj@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	casteyde.christian@...e.fr
Subject: Re: [PATCH 1/4] lockdep: lock_set_subclass() fix

On Tue, 2011-11-08 at 16:14 +0800, Yong Zhang wrote:
> 
> But how do we deal with ->class_cache? Always set it in
> loop_up_lock_class()? 

Hrm.. good point, aside from that there's another problem as well, I
think we can deal with the cache being NULL, but is memset() an atomic
write? If not a read could observe an intermediate state and go funny.

I'm tempted to go with the pure kmemcheck_mark_initialized() thing for
now.
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