linux-kernel - Re: [PATCH] sysfs: differentiate between locking links and non-links

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Date:	Wed, 10 Feb 2010 00:03:38 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Tejun Heo <tj@...nel.org>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	Neil Brown <neilb@...e.de>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sysfs: differentiate between locking links and non-links

Tejun Heo <tj@...nel.org> writes:

> Hello,
>
> On 02/10/2010 11:08 AM, Américo Wang wrote:
>> This bug report is new for me. Recently we received lots of sysfs lockdep
>> warnings, I am working on a patch to fix all the bogus ones.
>> 
>> However, this one is _not_ similar to the other cases, as you decribed.
>> This patch could fix the problem, but not a good fix, IMO. We need more
>> work in sysfs layer to fix this kind of things. I will take care of this.
>
> Can't we just give each s_active lock a separate class?  Would that be
> too costly?

When I asked the question earlier I was told that that locking classes
require static storage.  Where would that static storage come from?

Eric
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